Air Control Patents (Class 236/35)
  • Patent number: 9309840
    Abstract: Embodiments for monitoring fuel system degradation are provided. In one example, a method comprises driving a cooling fan with an electric motor in a vehicle, and during selected conditions, also driving a vacuum pump with the electric motor through a clutch. In this way, fuel system degradation may be indicated without use of a separate motor to drive a pressure building device.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: April 12, 2016
    Assignee: Ford Global Technologies, LLC
    Inventors: Robert Roy Jentz, Aed M. Dudar
  • Publication number: 20150107539
    Abstract: An arrangement for controlling the temperature of air being fed to a vehicle engine includes an engine compartment in which the engine is arranged. The engine compartment is provided with an ambient air intake allowing an airflow into the engine compartment. The engine is provided with an engine air intake arranged inside the engine compartment. The arrangement further includes an air fan for forcing the airflow via the ambient air intake into the inside of the engine compartment. The engine air intake is arranged in a position allowing at least a substantial part of the airflow to enter the engine air intake.
    Type: Application
    Filed: June 7, 2012
    Publication date: April 23, 2015
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Joakim Haegerstam
  • Publication number: 20150101789
    Abstract: First circulation portions switch a flow of a heat medium such that one of the heat media for two systems selectively circulates through a radiator flow path or a first bypass flow path. Second circulation portions switch the flow of the heat medium such that the heat media for the two systems selectively circulate with respect to a second flow path group. The first circulation portions and the second circulation portions are adapted to switch the flow of the heat medium so as to form a first circulation circuit for allowing the heat medium to circulate among a first flow path group, the second flow path group, and a first pump, as well as a second circulation circuit for allowing the heat medium to circulate among the first flow path group, the second flow path group, and a second pump.
    Type: Application
    Filed: May 16, 2013
    Publication date: April 16, 2015
    Inventors: Norihiko Enomoto, Nobuharu Kakehashi, Michio Nishikawa, Yasumitsu Omi, Takashi Yamanaka, Masayuki Takeuchi
  • Patent number: 8973845
    Abstract: An air-conditioning apparatus includes a temperature sensor for detecting a heat exchanger temperature or an inlet air temperature, a controller that performs variable control of the direction of the indoor unit air blow vane or the air flow speed or rate of the blower fan, and a remote controller that remote-controls indoor unit operation, wherein temperatures set via the remote controller are divided into two set temperature ranges and during heating operation the controller sets at least the air blow vane to a horizontal or downward direction on the basis of the two set temperature ranges and the heat exchanger temperature or the inlet air temperature.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Osamu Kanaya, Taro Hattori
  • Patent number: 8162086
    Abstract: A control system for a variable pitch radiator fan is disclosed. The control system is capable of varying the blade pitch of the radiator fan from a normal position to a full reverse position. The control system can change the blade pitch based on a number of factors, including vehicle speed. In systems with a plurality of fans, the control system is also capable of independently controlling the blade pitch of each of the fans. In systems with multiple fans, the control system can produce a circulation mode.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: April 24, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventor: James S. Robinson
  • Patent number: 8130505
    Abstract: This invention patent is a utility type of car fan controller. The controller has a housing and inside the housing is a circuit. The housing has a top cover forming a cavity and flat bottom plate. The circuit has a circuit board and an adjustment device with other electronic components. The circuit board has a socket connector and a wire harness connector. The top cover has socket connector aligned with socket connector opening. The top cover also has a wire harness connector aligned to wire harness connector socket. The modular practical new type of invention design facilitates faster assembly and more convenient flexible use.
    Type: Grant
    Filed: October 16, 2009
    Date of Patent: March 6, 2012
    Inventor: James Hsu Schurz
  • Patent number: 8073570
    Abstract: An unified controller for controlling a plurality of air-conditioning systems which are capable of air-conditioning individual air-conditioning rooms of a building using different schemes. The unified controller is located under a Building Management System (BMS) controller which simultaneously manages a plurality of systems corresponding to arrangements of the building, and simultaneously controls a multiple air-conditioning system acting as one of the air-conditioning systems and a central air-conditioning system acting as the other one of the air-conditioning systems using a single control command. The unified controller performs error correction, addition of a new function, and update of pre-loaded functions upon receiving a request from the remote controller.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: December 6, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Suhgoo Kim, Tanabe Takeshi, Hyeong Joon Seo, Gyoung Rok Kim, Jae Hyo Jeong
  • Publication number: 20110011356
    Abstract: A fan drive control device includes: a hydraulic motor driving a cooling fan by a hydraulic oil supplied from a hydraulic pump driven by an engine; a flow rate adjuster adjusting a flow rate of the hydraulic oil flowed into the hydraulic motor; a temperature sensor detecting a temperature of a fluid cooled by a cooling fan; an accelerator pedal angle sensor detecting an accelerator pedal angle for controlling an engine power based on a detected value by the temperature sensor; a target flow rate setting unit setting a target flow rate of the hydraulic oil flowed into the hydraulic motor; a target flow rate compensation unit compensating the target flow rate based on a detected value by the accelerator pedal angle sensor; and a control command generator generating a control command to the flow rate adjuster according to the target flow rate by the target flow rate compensation unit.
    Type: Application
    Filed: March 18, 2009
    Publication date: January 20, 2011
    Applicant: KOMATSU LTD.
    Inventors: Satoshi Tanaka, Kizuki Hagiwara
  • Patent number: 7863839
    Abstract: A fan speed control system for a machine is disclosed. The control system may include a fan to provide a flow of coolant to the machine. The system may further include a first sensor configured to generate a first signal indicative of an operational parameter of the machine, a second sensor associated with the fan to generate a second signal indicative of an actual speed of the fan, and a controller communicatively coupled to the fan, the first sensor, and the second sensor. The controller may be configured to generate a third signal indicative of a desired fan speed based on the first signal, and a fourth signal indicative of a difference between the desired fan speed and the actual fan speed. The controller may drive the fan based on the third signal and the fourth signal.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: January 4, 2011
    Assignee: Caterpillar Inc
    Inventors: Scott Richard Schuricht, Douglas I. Norman, Paul W. Peresta, Arvil Duane Wilson
  • Publication number: 20090025661
    Abstract: In a cooling fan drive system for a travel type working machine, the rotational speed of a cooling fan is controlled to the optimum rotational speed in accordance with temperature increase of the temperature of an engine cooling water, and the engine rotational speed is smoothly increased when the engine rotational speed is increased under travel acceleration. A fourth fan target rotational speed calculator 35e and a minimum value selector 35f are provided, and under non-operation, the fan target rotational speed is set to a low rotational speed irrespective of the temperature. When an acceleration pedal 12 is depressed to increase the rotational speed of the engine under travel acceleration, the increase of the drive pressure of a hydraulic motor 23 due to increase of the rotation of the cooling fan 9 is suppressed, and the load on the engine 1 is reduced.
    Type: Application
    Filed: October 24, 2006
    Publication date: January 29, 2009
    Inventors: Kentarou Itoga, Tsuyoshi Nakamura, Kazunori Nakamura
  • Patent number: 7066114
    Abstract: A system for reducing the time that it takes a vehicle fuel cell engine to reach its operating temperature at vehicle start-up. The system includes a radiator and a fan, where a cooling fluid from the engine is directed through the radiator where it is cooled by airflow from the fan during high load conditions. The radiator also receives ambient air through a front grill from movement of the vehicle. During vehicle start-up, when the engine is below its optimal operating temperature, the fan is operated in a reverse direction at variable speeds depending on the speed of the vehicle, so that the airflow through the grill that may otherwise convectively cool the engine is significantly reduced or eliminated.
    Type: Grant
    Filed: December 10, 2004
    Date of Patent: June 27, 2006
    Assignee: General Motors Corporation
    Inventors: Uwe Hannesen, Roberto Diesel, Jan Meschkat
  • Patent number: 7021071
    Abstract: A driving load of a cooling fan unit is selectively determined from a plurality of predetermined loads corresponding to vehicle parameters including a coolant temperature and a vehicle speed. Also, on the basis of a plurality of coolant temperature ranges and a plurality of vehicle speed ranges. The cooling fan unit is driven with the determined driving load. The vehicle parameters preferably further include a refrigerant pressure and a state of an air/con switch.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: April 4, 2006
    Assignee: Hyundai Motor Company
    Inventor: Chang Hyun Kim
  • Patent number: 6999906
    Abstract: The invention relates to a reconfiguration method designed to be implemented in a computer system, for compensating failures of a sensor system (1). The sensor system includes at least one sensor (2, 50) for measuring (12, 22) system states of an application system (11, 21) and at least one system model (4) for describing the application system, which together form at least one first observer (6) for estimating system states in order to provide system states for an allocated data processing device (14, 24). According to the method, failure states for a first observer are determined from deviations, which occur as a result of the comparison between a number of states measured by the sensor or sensors and a state estimated by the system model.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: February 14, 2006
    Assignee: EADS Deutschland GmbH
    Inventors: Thomas Koehler, Winfried Lohmiller
  • Patent number: 6824067
    Abstract: A method is provided for facilitating the cooling of engine coolant flowing through a radiator operatively connected to the engine. The method includes the steps of monitoring the temperature of the engine coolant flowing through the radiator and positioning a fan adjacent the radiator. The fan is initially rotated at a predetermined speed. Thereafter, the speed of the fan is varied in response to the temperature of the engine coolant.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: November 30, 2004
    Assignee: Generac Power Systems, Inc.
    Inventors: Robert D. Kern, Gerald C. Ruehlow, Bret Baird, Allen Gillette
  • Patent number: 6374780
    Abstract: A method and apparatus for controlling engine temperature in a closed circuit cooling system 12 of an automobile 10 having an electric water pump 34, a flow control valve 42, and electric fan 40. A powertrain control module 20 electrically coupled to the electric water pump 34, flow control valve 42 and electric fan 40 interprets inputs from various sensors to adjust the pumping speed of an electric water pump 34, adjust the rotational speed of an electric fan 40, and/or adjust the flow rate through a flow control valve 42 to the radiator 46 according to a look up table as a function of fuel economy, emissions, thermal management and electrical load management.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: April 23, 2002
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Cindy Marie Rutyna, Peter Langer, Paul Raymond Murray
  • Patent number: 6336592
    Abstract: A cooling system for a test and measurement instrument including a variable-speed fan, useful with different instruments having different configurations, employs a plurality of sensors disposed at predetermined locations within an enclosure of the instrument, and is software programmable with predetermined parameters of each particular configuration of each particular instrument. At least one of the sensors measures the temperature of a component that dissipates power at a substantially constant rate, and at least one of the sensors does not include a heat source to provide heat for measurement.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: January 8, 2002
    Assignee: Tektronix, Inc.
    Inventors: Brian G. Russell, Robert R. Kreitzer, Christopher R. Coleman, Theodore S. Hetke
  • Patent number: 6337949
    Abstract: The system comprises a pressure sensor for providing a signal indicative of the pressure of the refrigerant fluid of the air-conditioning system at the output or delivery of the compressor of the system, a sensor for detecting the temperature of the liquid flowing through the engine-cooling system (R), an activation sensor for providing a signal when the air-conditioning system is activated, a sensor for detecting the speed of forward movement of the motor vehicle, and a control and operating unit connected to the sensors and to the electric motor and arranged for: determining a first speed for the electric motor in accordance with a function of the pressure of the refrigerant fluid of the air-conditioning system and of the speed of the vehicle, determining a second speed for the electric motor in accordance with a function of the temperature of the engine-coolant liquid and of the speed of forward movement of the vehicle, and sending to the electric motor control signals to bring its speed of rotation to
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: January 8, 2002
    Assignee: Gate S.p.A.
    Inventors: Lionel Muron, Kamal Mourad
  • Patent number: 6182902
    Abstract: A thermal control method and device for automatically regulating the rotational speed of the fan cooler are disclosed in the present invention. The thermal control device comprises a control-voltage generator having a temperature-sensing device for sensing a temperature and generating a control voltage, a pulse modulator for modulating the pulse width of a clock signal with respect to the control voltage to generate a pulse modulation signal, and a fan driver for regulating the rotational speed of the fan cooler, modulating the refrigerant efficiency, and maintain the internal temperature of an apparatus, thereby consuming moderate power and making less noise.
    Type: Grant
    Filed: July 22, 1999
    Date of Patent: February 6, 2001
    Assignee: Mitac Technology Corp.
    Inventor: Min-Tien Shih
  • Patent number: 6126079
    Abstract: A fan control system for a vehicle cooling system includes forward and reverse relays connected to a microprocessor based timer control. A third relay is controlled by a single temperature responsive switch or thermostat and selects either the high speed or low speed winding of an electric radiator fan or similar engine cooling device dependent on the temperature sensed by the thermostat. The thermostat also provides an input to the timer control to adjust or interrupt preselected timing functions for certain fan conditions. Upon start-up of the engine, the control initiates a first delay period during which the fan is maintained in the off condition regardless of the temperature of the coolant. After the initial delay, a second and longer delay period is initiated to maintain the fan in the off condition provided the sensed temperature remains below a preselected level.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: October 3, 2000
    Assignee: Deere & Company
    Inventor: Jim Milton Shoemaker
  • Patent number: 6016965
    Abstract: A vehicle cooling system including a motor control apparatus that controls operation of a system motor when a cooling fan driven by the motor locks due to foreign matter interference or freezing. When motor input current is detected to be overcurrent, the controller limits the current flow. When current flowing to the electric motor is detected to be overcurrent and ambient air temperature is at or above a predetermined temperature, the controller stops energization of the motor. Thus, when the cooling fan freezes and locks, energization of the motor is maintained until ambient air temperature reaches or exceeds the predetermined temperature. Therefore, when the frozen-locked state is eliminated due to a subsequent temperature rise, an ordinary operating state can again be obtained without the controller subsequently detecting surge current, generated as a result of the motor being re-started from a fully stopped state, as overcurrent and therefore incorrectly stopping motor energization.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: January 25, 2000
    Assignee: Denso Corporation
    Inventors: Satoshi Yoshimura, Junji Sugiura, Toshiki Sugiyama, Kazuhiro Takeuchi
  • Patent number: 5947189
    Abstract: A heat exchanging system includes two cooling fans for cooling heat exchanging medium of a heat exchanger, and a control device for controlling rotational speeds of the cooling fans. The control device is attached to an outer surface of a fan shroud so that radiation fins of the control device is disposed inside the fan shroud. Further, the radiation fins of the control device is disposed between two fan accommodating portions each having a cylindrical shape. That is, the control device is disposed in a comparatively large space formed by two fan accommodating portions. Therefore, the control device can be readily attached to the fan shroud on a vehicle, and the size of the radiation fins can be made larger. Thus, the heat exchanging system cools the control device sufficiently while improving ventilation performance of the cooling fans.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: September 7, 1999
    Assignee: Denso Corporation
    Inventors: Kazuhiro Takeuchi, Toshiki Sugiyama, Takuya Usami
  • Patent number: 5778693
    Abstract: An engine cooling system and method and apparatus for controlling hydraulic fluid flow between a plurality of hydraulic components in a hydraulic system is shown. The system and method utilized at least one hydraulic sensor for actuating a hydraulic valve which controls the fluid delivery to the hydraulic components. At least one of the hydraulic sensors includes a thermosensitive material which causes the sensor to deliver hydraulic pressure to an actuator on the valve when the material is heated in response to an increase in temperature of, for example, a coolant associated with the engine.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: July 14, 1998
    Assignee: ITT Automotive Electrical Systems, Inc.
    Inventor: Michael J. Mientus
  • Patent number: 5718373
    Abstract: A system for controlling an automobile cooling fan utilizes a temperature-sensitive negative resistance device having a resistance which decreases as the temperature rises, and which increases as the temperature falls. Thus, if the cooling water temperature does not exceed a certain level, the cooling fan motor is not driven. If the temperature exceeds a certain level, the cooling fan motor is driven in proportion with the dynamic temperature variations. Therefore, a variable cooling fan speed is possible, and therefore, the cooling operation becomes efficient.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: February 17, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-ho Kim, Young-sik Lee
  • Patent number: 5465589
    Abstract: When the driver parks a truck for the purpose of sleeping in the cab's bunk space and desires to have the air conditioner operate, fan clutch cycling, which may create objectionable noise that disturbs sleep, is avoided by the inclusion of a branch circuit off of the air conditioner switch that comprises a parking brake switch in series with a relay coil. When the air conditioner is on and the parking brakes are set, this relay coil is energized to open a circuit to the engine fan clutch solenoid, preventing the fan clutch from being disengaged, and thereby keeping the fan in driven relation to the engine crankshaft so that fan clutch cycling does not occur.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: November 14, 1995
    Assignee: Navistar International Transportation Corp.
    Inventors: Burnell L. Bender, Brian P. Marshall
  • Patent number: 5307644
    Abstract: An electronic engine fan control device is disclosed. The control device includes means for detecting engine coolant temperature, operation of the vehicle air conditioning load, and vehicle road speed. The control device also includes means for generating first and second temperature signals in response to engine coolant temperature. The control device further includes override signal generating means for generating first and second override signal under certain temperature, or certain load and speed conditions. The control device finally includes means for comparing the first and second temperature signals and the first and second override signals for generating a control signal to operate the vehicle fan. A method for controlling an engine fan is also disclosed including the steps of detecting engine coolant temperature, air conditioning load and road speed and generating corresponding signals.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: May 3, 1994
    Assignee: Ford Motor Company
    Inventors: James M. Cummins, John I. Snoke, Gene R. Burnham
  • Patent number: 4955431
    Abstract: A device and method for cooling an internal combustion engine is disclosed in which a simple control circuit constructed of relatively inexpensive components enables the rotational speed of an electric motor employed in the cooling device to be controlled in adaptation to various temperature levels of a cooling circuit. The control circuit includes a power semiconductor which is used to drive the electric motor in certain speed ranges associated with predetermined temperature levels. The control circuit also incorporates a bypass circuit that permits the electrical motor to be driven in particular speed ranges without the use of the power semiconductor. Thus, the electric motor can be driven at one hundred percent of its speed capacity by eliminating a voltage drop associated with the power semiconductor.
    Type: Grant
    Filed: February 11, 1988
    Date of Patent: September 11, 1990
    Assignee: Behr-Thomson Dehnstoffregler GmbH
    Inventors: Roland Saur, Rolf Schaper
  • Patent number: 4875521
    Abstract: There is disclosed an over-the-road truck having an internal combustion engine of at least 200 hp including a radiator and an electric fan assembly therefor consisting of an electric motor to which is attached an axial flow propeller fan and operating only when necessary and of a minimum wattage determined by W=1.75E wherein E is the engine horsepower provided that the core size (in.sup.2) of the radiator is 3E and the air flow (CFM) therethrough is at least 22.5E.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: October 24, 1989
    Inventor: Roger Clemente
  • Patent number: 4804139
    Abstract: A cooling system for a water-cooled vehicle engine has a radiator through which cooling water flows and which can be exposed to cooling air by an electric fan (9). A first heat sensor (F1) on the engine block senses the water outflow temperature, while a second heat sensor (F2) senses the radiator outflow temperature. The sensed values from both sensors are fed to an electronic control unit (11) which also stores temperature threshold values for both sensor, at which certain functions have to be performed. In the event of failure of either sensor, the electronic control unit (11) takes over the function of the sensor: from the temperature value sensed by the other sensor a temperature equivalent value is formed by adding or subtracting the temperature difference which exists between the two sensors at running temperature. The control unit then activates the appropriate function if the relevant threshold value is reached or exceeded.
    Type: Grant
    Filed: November 9, 1987
    Date of Patent: February 14, 1989
    Assignee: Audi AG
    Inventor: Axel Bier
  • Patent number: 4687132
    Abstract: An automotive vehicle engine having a coolant circulation system with a radiator, a fan, and a thermostatic valve for controlling coolant flow through the radiator. This thermostatic valve starts to open at a first temperature, is fully opened at a second temperature, and is partly opened at an intermediate third temperature. A system for coupling the fan to a rotation engine member includes: a first member rotationally coupled to the rotating member; a second member rotationally coupled to the fan; and a mechanism for providing rotational coupling between the first and second members. The degree of rotational coupling is lower when a first control valve is closed than opened, and is lower when a second control valve is closed than opened.
    Type: Grant
    Filed: April 9, 1986
    Date of Patent: August 18, 1987
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
    Inventors: Shunkichi Suzaki, Toshiaki Shirai, Hisanobu Adachi, Masaharu Hayashi, Kenji Hattori, Yoshinari Takakura
  • Patent number: 4658595
    Abstract: A cooling system for radiator and condenser with an air conditioner having first and second electrically driven blowers for cooling the radiator and condenser, and a cooling cycle operation switch which comprises a control circuit provided on at least one side of the first and second blowers for either stopping or operating at low speed the one of the first and second blowers when any electrical equipment of vehicle such as headlights, wipers, is operated during the cooling cycle, an engine cooling water temperature switch operative to turn on and off the first blower by releasing the control of the control circuit when any of the electrical equipments is operated, and/or a thermal load switch operative to turn of and off the second blower in accordance with the outside temperature conditions by releasing the control of the control circuit, when any of the electrical equipments is operated.
    Type: Grant
    Filed: November 26, 1985
    Date of Patent: April 21, 1987
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yukio Shimada, Yutaka Obata, Takahisa Takeoka, Toyotoshi Katoh
  • Patent number: 4651922
    Abstract: A cooling system for a radiator in an internal combustion engine is provided with a pair of fans connected to a first motor for a small electric current and a second motor for a large electric current, respectively. Relays are provided for operating the first and/or second motor sequentially in accordance with the degree of cooling requirement of the engine. A delay device is provided for delaying the operation of the relay(s) for attaining a stronger cooling requirement for a predetermined short period just after the engine is started. A generation of rush current in the relay contacts is prevented.
    Type: Grant
    Filed: April 25, 1986
    Date of Patent: March 24, 1987
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Masahiko Noba
  • Patent number: 4590772
    Abstract: An air-conditioning system for a vehicle is configured so as to adjust draft volume to a condensor for an air conditioner on the basis of the pressure of refrigerant circulated through a condensor and atmospheric temperature to optimize draft volume to be distributed to the condensor and the radiator. The air-conditioning system comprises a plurality of motor-fans for the condensor and the radiator, a refrigerant pressure sensor provided at the input and output of the condensor, an atmospheric temperature sensor, and an operational mode control unit responsive to the refrigerant pressure sensor and to the atmospheric temperature sensor.
    Type: Grant
    Filed: October 5, 1984
    Date of Patent: May 27, 1986
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Toshimitsu Nose, Toshio Ohashi
  • Patent number: 4570849
    Abstract: Disclosed is a fan drive, in particular one for cooling installations of rail vehicles. The fan drive comprises a hydraulic motor and a control valve which regulates a bypass as a function of temperature, thus affecting the flow of a pressure medium driving the motor. The control valve comprises a control piston subjected to a control pressure in the direction of closing the bypass, and a counterbalancing pressure in the opposite direction from the source of the pressure medium. The control valve also comprises a control spring which biases the control piston in the direction of closing the valve, and a pilot valve which affects the control pressure. The pilot valve is actuated by an electromechanical servo component. The pilot valve is located in an insert which is arranged within the control piston. A central bore of the control piston is slidingly guided on the convex surface of the insert so as to form a seal.
    Type: Grant
    Filed: November 16, 1984
    Date of Patent: February 18, 1986
    Assignee: Sueddeutsche Kuehlerfabrik Julius Fr. Behr GmbH & Co. KG
    Inventors: Thomas Klaucke, Franz Pigisch
  • Patent number: 4555910
    Abstract: A variable speed fan drive, operated in response to the sensed coolant temperature in an internal combustion engine for a vehicle, blows a controlled amount of air through the engine's radiator to maintain the coolant temperature in a desired narrow operating range. The air pulled in by the fan also cools the refrigerant flowing through the condenser of the vehicle's air conditioning system, the condenser being positioned in front of the coolant radiator. If insufficient condenser cooling occurs, even though the coolant may be adequately cooled, the refrigerant temperature rises and causes the compressor discharge pressure in the air conditioning system to increase. That pressure is monitored or sensed and if it exceeds a predetermined maximum allowable level the normal operation of the control system is overriden and the fan is driven at its maximum speed to maximize the air blown through the condenser and radiator, thereby decreasing the refrigerant temperature and thus the discharge pressure.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: December 3, 1985
    Assignee: Borg-Warner Corporation
    Inventor: Fred D. Sturges
  • Patent number: 4487255
    Abstract: A fan drive system (10) controls the start-up of a fluid driven fan motor (16) in response to an engine being started. Since the fan motor (16) is many times located remote from the engine, it is important to start the fan motor (16) turning simultaneously when the engine is started. A control mechanism (32) changes the displacement of a pump (12) to operate at an operative position for a predetermined time period from initial start-up to ensure that the motor (16) starts to turn the fan (22). The control mechanism (32) automatically reduces the pump displacement to a standby position at the expiration of the predetermined time period to conserve energy.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: December 11, 1984
    Assignee: Caterpillar Tractor Co.
    Inventors: Donald L. Bianchetta, Robert W. White
  • Patent number: 4485624
    Abstract: A highly supercharged engine with a high mean effective pressure (m.e.p.) is equippped with a cooling system including a radiator for the liquid cooling of the engine and a radiator for the supercharging air delivered by a turbocompressor. The liquid radiator is positioned upstream of the air radiator in the air-flow generated by a common blower.
    Type: Grant
    Filed: September 10, 1981
    Date of Patent: December 4, 1984
    Inventor: Jean F. Melchior
  • Patent number: 4446697
    Abstract: A vehicle engine accessory drive system is disclosed including a hydraulic fan motor (M) and a power steering gear mechanism (SG) in series flow relationship. The system includes a variable displacement power steering pump assembly (P) which is the sole source of fluid for the system, and includes a variable displacement pumping element (PE) and a displacement control valve (CV). The displacement control valve includes a pilot valve (35) which is responsive to the demand for cooling to vary the fluid pressure in a signal chamber (63). The displacement control valve is operable to communicate a control fluid pressure to a stroking cylinder (SC) to control the fluid delivery rate of the pumping element. At a first relatively lower temperature, the displacement control valve maintains the fluid delivery rate of the pumping element at Z, and at a second relatively higher temperature, to maintain the fluid delivery rate at X.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: May 8, 1984
    Assignee: Eaton Corporation
    Inventor: Edward J. Goscenski, Jr.
  • Patent number: 4445583
    Abstract: Two embodiments of V-belt tensioning devices are employed in a cooling system of a vehicle having an engine (20) transversely mounted for rocking motion relative the vehicle frame (42). The cooling system includes an engine cooling radiator (22) mounted forwardly of the engine and substantially parallel to the rotational axis of the engine crankshaft; a cross-flow fan (24) having a rotational axis fixed against movement relative to the vehicle frame, substantially parallel to the crankshaft axis, and between the crankshaft axis and the plane of the radiator; a V-belt drive (32, 34 36) for rotating the fan in response to rotation of the crankshaft; and the two embodiments of the tensioning devices which maintain the V-belt tension as the distance between the crankshaft and fan axes varies in response to rocking motion of the engine. In one embodiment the tensioning device (90) is a split pulley (36). In the other embodiment the tensioning device (108) is a spring loaded idler pulley (110).
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: May 1, 1984
    Assignee: Eaton Corporation
    Inventor: Joseph S. Mazur
  • Patent number: 4425766
    Abstract: A power control system for an electric motor driven cooling fan that directs air over the radiator and air conditioning condenser of a motor vehicle. The system includes a pulse width modulated voltage control device for controlling the voltage applied to the cooling fan motor from the vehicle engine driven generator. The voltage applied to the cooling fan motor can be controlled in response to engine coolant temperature, vehicle road speed, engine speed and the "on"/"off" state of the vehicle air conditioning system. A digital system that determines voltage pulse width in accordance with the above-mentioned variables is disclosed.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: January 17, 1984
    Assignee: General Motors Corporation
    Inventor: George M. Claypole
  • Patent number: 4257554
    Abstract: This invention is directed to a fan assembly for use with temperature exchange units and heat exchange units such as a radiator, a heater, an oil cooler, etc. Most automotive vehicles are powered by an internal combustion engine having water, oil and other fluids to be cooled. And, most of the internal combustion engines are associated with a radiator or a heat exchanger unit for cooling fluid in the engine, transmission or other oils and hydraulic fluids. An automotive vehicle operating at a low speed usually requires a fan to assist the radiator or heat exchanger unit in cooling the cooling fluids. However, at higher ram air speed a fan is not normally required to assist the radiator or heat exchanger in cooling the cooling fluids as there is sufficient cooling due to the natural passage of air over the cooling surfaces of the heat exchange units.
    Type: Grant
    Filed: November 20, 1978
    Date of Patent: March 24, 1981
    Assignee: Flex-A-Lite Products Corporation
    Inventor: Rainer O. Willingham
  • Patent number: 4228880
    Abstract: A viscous fluid coupling employing an electro magnet which receives electrical pulses in response to a signal received from a heat sensing device to operate a valve arm to seal and unseal an inlet passage fluidly communicating an operating chamber with a storage chamber. The operating chamber is defined by a clutch member and a housing member that are rotatably disposed relative to one another. The storage chamber is defined by the housing and is in fluid communication with the operating chamber via a discharge passage and the inlet passage. A pump displaces fluid from the operating chamber through the discharge passage into the storage chamber. The inlet passage directs fluid when unsealed from the storage chamber to the operating chamber. The valve arm is moved in one direction in response to inducing a magnetic field and in the other direction by a spring when the magnetic field is not induced.
    Type: Grant
    Filed: September 25, 1978
    Date of Patent: October 21, 1980
    Assignee: Eaton Corporation
    Inventor: Thomas A. Gee
  • Patent number: 4223646
    Abstract: A hydraulic motor drives the cooling fan of an internal combustion engine. Fluid flow from a fixed displacement pump is directed through a pilot-operated pressure-compensated control valve to the hydraulic motor. The valve has a continuous bias to a fan-on position for directing fluid to the fan motor. Flow to the fan motor is diverted by the valve as a function of the pressure of the fluid in the system. In addition, flow to the fan motor is diverted as a function of a pilot pressure signal which is controlled by the temperature of the engine coolant fluid. The valve failsafes to a condition directing maximum flow to the fan motor in the event of loss of pilot fluid pressure.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: September 23, 1980
    Assignee: TRW Inc.
    Inventor: Mark R. Kinder
  • Patent number: 4200146
    Abstract: A method and apparatus for hydraulically driving and controlling a cooling fan.The apparatus includes a variable displacement hydraulic pump driven by a prime mover and a hydraulic motor connected to the pump and being driven thereby. The motor in turn is connected to a fan which serves to cool fluid passing through an associated heat exchanger. A temperature/force transducer monitors the temperature of fluid flowing from the exchanger and serves to control a pilot relief valve associated therewith. A pressure regulator is connected to the pump and acts in cooperation with the relief valve to control fluid pressure from the pump and thus torque of the motor and speed of the cooling fan.The method includes the steps of pumping hydraulic working fluid to a motor and driving the motor with the full hydraulic output of the pump to power a fan associated with a cooling system heat exchanger.
    Type: Grant
    Filed: November 4, 1977
    Date of Patent: April 29, 1980
    Assignee: Dynex/Rivett Inc.
    Inventor: John R. Olson
  • Patent number: 4176630
    Abstract: The invention provides a pneumatic control system for a pneumatically operated clutch in the drive to a cooling fan of a vehicle engine. There are two thermostat valves arranged in series in the pneumatic control line. One valve is positioned in the supercharged air passage and the other valve is in the liquid coolant passage. If the temperature at either valve becomes excessive the supply line 22 is connected to relief and the fan clutch automatically engages.
    Type: Grant
    Filed: June 1, 1977
    Date of Patent: December 4, 1979
    Assignee: Dynair Limited
    Inventor: Arthur E. H. Elmer
  • Patent number: 4174065
    Abstract: Fluid flow regulating systems involving systems for controlling the motor speed of fluid pumping devices are disclosed. The speed control systems involve use of a velocity head force sensor that movably responds to the velocity head forces of an air stream delivered by the pumping device, and these movements in the positions assumed by the force sensor are detected and used to control the power delivered to the motor. Temperature change detectors are used in most embodiments to modify the force sensor movements so as to introduce temperature change factors as well as velocity head force change factors into the control of the power circuitry. Force sensor of the pivotal vane, bendable vane and airfoil types are shown, and temperature sensors of the bimetallic and expandable fluid types are also used.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: November 13, 1979
    Assignee: Knauth Design, Inc.
    Inventor: Berthold A. Knauth
  • Patent number: 4124001
    Abstract: An electronic speed control system for controlling the drive speed of a cooling fan for a motor vehicle. The system includes a temperature sensor to monitor the temperature of the motor coolant to be cooled by the fan. The sensor develops a signal which is proportional to the temperature of the coolant which signal is amplified and modified by an electronic control unit to provide a speed control signal. A rotatable drive unit is coupled to the vehicle drive motor and rotates at a speed which is proportional to the vehicle drive motor's speed. A variable coupler is connected between the drive unit and the cooling fan and is controlled by the speed control signal in order to regulate the speed of the fan and thereby control the temperature of the coolant. The electronic control unit includes means for monitoring the speed of the fan and for limiting the maximum speed of the fan.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: November 7, 1978
    Assignee: FMC Corporation
    Inventors: Alan J. Samuel, Alan M. Loss, Hans H. Cremer
  • Patent number: 4062329
    Abstract: A variable speed fan drive mechanism for an engine coolant system control by temperature and fan speed signals. The mechanism includes a hydrostatic pump-motor unit (hydrostatic transmission) powered by the engine, for transmitting power to the fan. Mechanical signals related to coolant temperature and fan speed are supplied to a comparator mechanism that delivers a mechanical output control signal. The output control signal is magnified and applied as a control force to vary the displacement of the pump in the hydrostatic unit. The comparator mechanism has the effect of negating engine speed as a control force. Thus, high engine speeds (that would tend to produce unduly large hydraulic flows through the pump-motor circuit) are reflected in high fan speed signals fed into the comparator mechanism, which produces a "corrected" output signal that appropriately reduces pump dislacement to thus reduce the fan speed to low energy consumption levels.
    Type: Grant
    Filed: July 29, 1976
    Date of Patent: December 13, 1977
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Russell L. Rio
  • Patent number: 4044287
    Abstract: A constant current source is provided for the energizing circuit of an electromotor driving a blower. The constant current source includes a battery connected in parallel with a series circuit including the energizing circuit of the motor, the emitter-collector circuit of a transistor and a control resistance. The transistor and control resistance are part of the constant current source. The base of the transistor is connected to the output of a differential amplifier the first input of which receives a reference voltage while the second input receives a voltage corresponding to the voltage across the control resistance and thus the energizing current. The reference voltage is derived from a potentiometer connected in parallel with the battery.
    Type: Grant
    Filed: July 23, 1974
    Date of Patent: August 23, 1977
    Assignee: Robert Bosch GmbH
    Inventors: Rudiger Ratzel, Helmut Steinmann
  • Patent number: 4036432
    Abstract: A variable speed drive system for driving one or, preferably, a plurality of fans at a desired, controllable speed. The fans are rotated by motors in fluid communication with variable displacement pumps. The motors rotate the fans at a speed corresponding to the fluid displacement of the pumps and an adjusting structure operably connected to the pumps regulates the fluid displacement of the pumps so that the fans are driven by the motors at a desired speed. Preferably, the adjusting structure includes a temperature sensor and a pump displacement control responsive to the temperature sensor so that the fluid displacement of the pumps is automatically regulated in response to the temperature of the substance cooled by the fans.
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: July 19, 1977
    Inventor: Albert L. George