Intake Air Pressure Patents (Class 73/114.37)
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Publication number: 20110184632Abstract: A method for estimating an oxygen concentration in an intake manifold of a diesel engine utilizing exhaust gas recirculation includes monitoring engine operation, monitoring an exhaust gas recirculation valve, and monitoring an exhaust air fuel ratio. When the engine operates in steady state with the exhaust gas recirculation valve in the closed position, a volumetric efficiency for the engine is updated. A partial pressure due to exhaust gas recirculation within the intake manifold based upon the updated volumetric efficiency is determined, and an estimated oxygen concentration within the intake manifold based upon the partial pressure due to exhaust gas recirculation within the intake manifold and the exhaust air fuel ratio is determined Operation of the engine is controlled based upon the estimated oxygen concentration within the intake manifold.Type: ApplicationFiled: January 26, 2010Publication date: July 28, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Jun-Mo Kang, Ibrahim Haskara, Chen-Fang Chang, Yue-Yun Wang
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Publication number: 20110167900Abstract: A method of determining opening of an intake valve of an internal combustion engine, the method including the steps of: determining the time pattern of an intake pressure in an intake manifold of the internal combustion engine, the time pattern of the rotation speed of a drive shaft of the internal combustion engine, or the time pattern of a voltage at the terminals of a battery of the internal combustion engine; determining an intake-frequency component of the intake pressure, the rotation speed, or the voltage; and determining opening of the intake valve as a function of the intake-frequency component of the intake pressure, and also as a function of the intake-frequency component of the rotation speed or voltage.Type: ApplicationFiled: September 21, 2010Publication date: July 14, 2011Applicant: MAGNETI MARELLI S.P.A.Inventors: Massimo Zanotti, Fabio Sensi, Marco Panciroli, Andrea Leoni, Francesco Alunni, Filippo Cavanna
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Publication number: 20110154821Abstract: Methods are provided for estimating an exhaust temperature of an engine exhaust of a turbocharged engine prior to an inlet of the turbine of the turbocharger. These methods estimate the pre-turbine exhaust temperature based on thermodynamic equations and measured temperature and pressure values from elsewhere in the system. The estimated pre-turbine exhaust temperature can be used for controlling the engine, for verification of the emissions control system, and can also be compared against actual measurements of the pre-turbine exhaust temperature to evaluate engine performance. The present invention also provides turbocharged engine systems including sensors to make the required measurements and logic configured to estimate the pre-turbine exhaust temperature.Type: ApplicationFiled: December 24, 2009Publication date: June 30, 2011Inventor: LINCOLN EVANS-BEAUCHAMP
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Patent number: 7963154Abstract: A sensor unit for measuring a measurement variable in a medium, in particular in an aggressive liquid or gaseous medium, comprises a sensor that is arranged in a sensor capsule and has a sensor region that is arranged on a base body. In order to detect the measurement variable in the sensor region, a measurement opening is provided in the sensor capsule. On a side facing the measurement opening, the sensor region has a measurement surface that is provided with measurement electronics. An electrical supply line is provided on the sensor for the purpose of transmitting a sensor signal that is generated by the measurement electronics. A plated-through hole is provided in the base body. The plated-through hole is used to connect the measurement electronics to the electrical supply line via signals through the base body, on a base side of the sensor that faces away from the measurement opening.Type: GrantFiled: August 28, 2007Date of Patent: June 21, 2011Assignee: Kistler Holding AGInventors: Ernst Obermeier, Biswajit Mukhopadhyay, Jochen Von Berg, Ulrich Albicker, Marco Gnielka, Claudio Cavalloni
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Publication number: 20110137509Abstract: A method is described for diagnosing the functioning of one or more variably triggerable intake valves and/or exhaust valves in an internal combustion engine, including the following steps:—determining a modeled pressure value which provides a pressure value in an air system of the internal combustion engine, the pressure variation model describing a pressure variation of an error-free internal combustion engine as a function of the operating point; providing a value for the actual instantaneous pressure in the air system; ascertaining a deviation variable as a function of the modeled pressure value and a value for the actual pressure in the air system; detecting an error in the functioning of the intake valve and/or the exhaust valve as a function of the deviation variable.Type: ApplicationFiled: April 3, 2009Publication date: June 9, 2011Inventor: Ipek Sarac
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Patent number: 7945371Abstract: In turbocharged engines, there is the problem that, in particular under load, the ambient pressure (AMP) cannot be determined directly from the measurement values of a charge-pressure sensor (8). In order to avoid the installation of a further pressure sensor which is suitable for the detection of the ambient pressure (AMP), it is proposed that, during a negative load step of the internal combustion engine in which a switch takes place from supercharged engine operation into non-supercharged engine operation, the charge-pressure sensor (8) measures the transient profile of the charge pressure (PUT). A value for the ambient pressure (AMP) is determined from the transient profile of the charge pressure (PUT). Through the pressure value for the present ambient pressure (AMP), it is possible to optimize the engine operation for example when travelling up a slope.Type: GrantFiled: May 25, 2007Date of Patent: May 17, 2011Assignee: Continenetal Automotive GmbHInventor: Thomas Burkhardt
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Publication number: 20110100106Abstract: The present invention provides apparatus (100) and methods for testing for leaks in forced-induction internal combustion engine (10) air intake systems. The apparatus (100) includes a plurality of work faces (132n) each having at least one flange (134n) disposed thereon for attaching the apparatus (100) to an air intake system of an engine (10). An air flow valve (136n) is disposed on each work face (132n), those valves (136n) being moveable between open and closed positions. The apparatus (100) also includes a compressed air supply inlet (138) configured to supply compressed air to the air flow valves (136n). Wherein, compressed air can be supplied to the air intake system of engine (10), via an open valve (136n) which is, in use, internal of the intake system, enabling a simulated air pressure test to be performed in order to locate possible intake system leaks.Type: ApplicationFiled: October 30, 2009Publication date: May 5, 2011Inventor: Rodney Graeme SPARGO
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Patent number: 7934419Abstract: In an intake air mass flow measurement device, for preventing clogging in a pressure intake tube due to water or the like entering the pressure intake tube in a device measuring a pressure in the intake air tube, the intake air mass flow measurement device includes a mass air flow measurement device for measuring an intake air mass flow in an intake air tube; and a pressure sensing device for sensing pressure in the intake air tube, the pressure sensing device being integrated with the mass air flow measurement device, and an aperture plane opened to the inside of a main air flow passage for detection of the pressure takes in pressure by using a gap generated between a main air flow passage constituting member and an insertion part of the mass air flow measurement device when a measurement part of the mass air flow measurement device is inserted into the main air flow passage. With this construction, it is possible to provide a structure in which water or the like can hardly clog the pressure intake port.Type: GrantFiled: June 4, 2008Date of Patent: May 3, 2011Assignee: Hitachi, Ltd.Inventors: Takayuki Saito, Shinya Igarashi, Takayuki Yogo, Chihiro Kobayashi
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Publication number: 20110093182Abstract: A method and system for estimating engine parameters in a combustion engine gas exchange system based on dynamic pressure readings taken by one or more pressure sensors. According to an exemplary embodiment, the method and system may use an artificial neural network (ANN) to process the dynamic pressure readings and any additional engine conditions that may have been provided.Type: ApplicationFiled: April 28, 2009Publication date: April 21, 2011Applicant: BorgWarner BERU Systems GmbHInventors: Olaf Weber, Wolfgang Wenzel
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Patent number: 7921709Abstract: Methods and systems are provided for monitoring cylinder valve deactivation of a cylinder valve of an engine. One example method comprises, indicating degradation of cylinder valve deactivation in response to manifold pressure at or around a characteristic frequency.Type: GrantFiled: January 13, 2009Date of Patent: April 12, 2011Assignee: Ford Global Technologies, LLCInventors: Jeffrey Allen Doering, John Eric Rollinger
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Publication number: 20110079298Abstract: A method for the functional testing of a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, enables the testing of the pressure switch even while the crankshaft is rotating. The pressure switch is located in a low pressure position if the pressure in the tank vent device is lower than a pressure threshold, and is otherwise in a high pressure position. In a rotating operating state of the crankshaft in which the pressure in an intake pipe exceeds the pressure threshold, a tank vent valve being disposed in a connecting line between a fuel vapor reservoir and the intake pipe is actuated such that the tank vent device and the intake pipe are pneumatically connected to each other. The pressure switch is assessed as defective if it is in the low pressure position after actuation of the tank vent valve.Type: ApplicationFiled: April 17, 2009Publication date: April 7, 2011Inventor: Gerhard Eser
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Publication number: 20110072894Abstract: The present invention utilizes self-heating of electronic components to improve a humidity sensing part with low environment resistance, such as a condensation problem and the like, and also to enhance the heat radiation efficiency of electronic components. The humidity sensing part is used in an intake tube of an automobile by integrating, for example, with a heating resister type mass air flow measurement device. A humidity sensing element is mounted on an electronic circuit board in a mass air flow measurement device with the temperature thereof starting to increase immediately after a sensor has been actuated. This urges the temperature of the humidity sensing element to start increasing (being heated) immediately after the sensor has been actuated. To urge the humidity sensing element to be further heated, a base plate is composed of two types of materials, resin and metal.Type: ApplicationFiled: June 29, 2010Publication date: March 31, 2011Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takayuki SAITO, Chihiro Kobayashi, Takayuki Yogo
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Patent number: 7878049Abstract: A method of indicating a fault associated with a non-combustion chamber of an engine includes monitoring a fluid intake pressure for the engine, monitoring a pressure for a non-combustion chamber of the engine, and indicating a fault associated with the non-combustion chamber based on a difference between a first non-combustion chamber pressure and a second non-combustion chamber pressure being below a chamber threshold value.Type: GrantFiled: August 28, 2008Date of Patent: February 1, 2011Assignee: Caterpillar Inc.Inventors: James Allen Roal, Richard “Cort” Severns, II
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Patent number: 7856967Abstract: A method of controlling a motor vehicle is disclosed. The method can be used to determine an ambient pressure value without the use of an ambient pressure sensor. The ambient pressure value can be used for controlling a set of fuel injectors. The method can include provisions for adjusting the ambient pressure value to correct for errors introduced by engine wear and other factors.Type: GrantFiled: July 17, 2008Date of Patent: December 28, 2010Assignee: Honda Motor Co., Ltd.Inventors: James S. Robinson, Jared C. Vanderhoof
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Publication number: 20100299087Abstract: A method for diagnosing pressure sensors of an air supply of an internal combustion engine, the air supply having an intake port, which, viewed in the air supply direction, leads into at least two sub-ports, via which air is suppliable to different cylinder banks of the internal combustion engine, a first pressure sensor being assigned to a first sub-port, a second pressure sensor being assigned to a second sub-port, and a third pressure sensor being assigned to the intake port, a first air mass flow associated with the first pressure sensor, a second air mass flow associated with the second pressure sensor and a third air mass flow associated with the third pressure sensor being ascertained, pressure values ascertained by the first pressure sensor and the second pressure sensor being compared to each other and the sum of the first air mass flow and the second air mass flow being compared to the third air mass flow.Type: ApplicationFiled: May 19, 2010Publication date: November 25, 2010Inventors: Patrick MENOLD, Soenke Mannal
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Patent number: 7805984Abstract: A method of diagnosing a malfunction of a tuning valve of an intake manifold coupled to an internal combustion engine is provided. The method includes: commanding the tuning valve to at least one of a closed and an opened position; computing an average deviation of manifold absolute pressure; determining an average deviation threshold using fuzzy logic based on engine speed and airflow per cylinder; comparing the average deviation to the average deviation threshold; and diagnosing a malfunction of the tuning valve based on a comparison of the average deviation and the average deviation threshold.Type: GrantFiled: August 24, 2006Date of Patent: October 5, 2010Inventors: Kurt D. McLain, Wenbo Wang
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Patent number: 7779809Abstract: A sensor unit includes a unit main body mounted on a throttle device, and a pressure sensor chamber that is provided at the unit main body and that accommodates an intake pressure sensor to detect an intake pressure through an intake pipe. The pressure sensor chamber is divided by a partition into a pressure receiving area to receive a pressure in the intake pipe and a pressure detecting area to detect the pressure by the intake pressure sensor, such that the pressure receiving area communicates with the pressure detecting area through a communication portion. A foreign substance is prevented from flowing into the intake pressure sensor when guiding air in the intake pipe to the intake pressure sensor, thereby improving detection accuracy by the intake pressure sensor.Type: GrantFiled: May 26, 2005Date of Patent: August 24, 2010Assignee: Mikuni CorporationInventors: Kazuhiro Musashi, Noriaki Takagi, Osamu Miura
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Publication number: 20100175463Abstract: Methods and systems are provided for monitoring cylinder valve deactivation of a cylinder valve of an engine. One example method comprises, indicating degradation of cylinder valve deactivation in response to manifold pressure at or around a characteristic frequency.Type: ApplicationFiled: January 13, 2009Publication date: July 15, 2010Applicant: Ford Global Technologies, LLCInventors: Jeffrey Allen Doering, John Eric Rollinger
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Publication number: 20100126260Abstract: A pressure measurement system includes a multiplexer unit which inputs a plurality of electrical signals representative of pressures, and a comparison unit which compares the electrical signals among each other to determine a specified signal characteristic, wherein the multiplexer unit selects one of the electrical signals as an output signal based on the determination of the specified signal characteristic, and outputs the selected signal.Type: ApplicationFiled: November 20, 2009Publication date: May 27, 2010Applicant: BG Soflex LLCInventors: Bruce BOWLING, Albert Grippo
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Patent number: 7681442Abstract: In a non-critical pressure region where a pressure ratio [Pm/Pthrup(i?1)] of an intake air pressure Pm(throttle downstream pressure) detected by an intake air pressure sensor to a previous throttle upstream pressure Pthrup(i?1) is greater than a predetermined value B, the previous throttle upstream pressure Pthrup(i?1) is substituted for one of two terms of the throttle upstream pressures Pthrup(i) included in an intake system model so that present throttle upstream pressure Pthrup(i) is calculated. In a critical pressure region where the pressure ratio is less than or equal to the predetermined value B, a physical value f(Pm/Pthrup(i)) using a pressure ratio [Pm/Pthrup(i)] of the intake air pressure Pm to a present throttle upstream pressure Pthrup(i) as a parameter is regarded as a steady value fc so that the present throttle upstream pressure Pthrup(i) is calculated.Type: GrantFiled: May 13, 2008Date of Patent: March 23, 2010Assignee: Denso CorporationInventors: Tomoaki Nakano, Atsushi Koike
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Patent number: 7677091Abstract: A computer calculates an estimated cylinder-intake-air amount based on outputs from an airflow meter and a throttle position sensor, and then calculates a reference cylinder-intake-air amount based on an air-fuel ratio in an exhaust gas and fuel injection amount. An error of the estimated cylinder-intake-air amount is calculated by comparing the reference cylinder-intake-air amount with an estimated cylinder-intake-air amount base value. The error is low-pass filtered. The estimated cylinder-intake-air amount base value is corrected to obtain the final estimated cylinder-intake-air amount.Type: GrantFiled: June 26, 2008Date of Patent: March 16, 2010Assignee: DENSO CorporationInventors: Yasuo Mukai, Tetsuji Mitsuda
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Publication number: 20100050754Abstract: A method of indicating a fault associated with a non-combustion chamber of an engine includes monitoring a fluid intake pressure for the engine, monitoring a pressure for a non-combustion chamber of the engine, and indicating a fault associated with the non-combustion chamber based on a difference between a first non-combustion chamber pressure and a second non-combustion chamber pressure being below a chamber threshold value.Type: ApplicationFiled: August 28, 2008Publication date: March 4, 2010Inventors: James Allen Roal, Richard "Cort" Severns, II
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Publication number: 20100028167Abstract: Immediately after startup of the engine, secondary air is supplied by an air pump into each exhaust branch passage via a secondary-air supply passage. A pressure sensor is disposed in the secondary-air supply passage. An output voltage of the pressure sensor decreases as the battery voltage decreases. When the battery voltage is lower than a permissible voltage, the output value of the pressure sensor is inhibited from being used as an output value representing the pressure. Thus, atmospheric pressure can be accurately detected.Type: ApplicationFiled: November 30, 2007Publication date: February 4, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Shinya Kondou, Yasuhiro Oi
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Patent number: 7647823Abstract: A sensor for an engine manifold is provided that includes a sensing component positioned within the engine manifold and responsive to a condition, such as temperature or pressure, within the engine manifold. The sensor includes a shield partially surrounding the sensing component upstream of the sensing component in flow within the manifold, which includes exhaust gases and manifold intake air. The shield does not surround a downstream side of the sensing component. The shield minimizes contamination of the sensing component by contaminants within the exhaust gases or manifold intake air, without compromising responsiveness of the sensing component to changes in the sensed condition, as the sensing component is still directly open to the manifold air (i.e., the exhaust gases and intake air).Type: GrantFiled: May 12, 2008Date of Patent: January 19, 2010Assignee: GM Global Technology Operations, Inc.Inventor: Chris Edward Tuski
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Patent number: 7634940Abstract: A method and a device for monitoring the intake manifold pressure of an internal combustion engine in which a measured signal for the intake manifold pressure is compared with a reference signal for the intake manifold pressure. For a deviation of the measured signal for the intake manifold pressure from the reference signal for the intake manifold pressure, a tolerance range is predefined for error-free operation of the intake and/or exhaust valves of at least one cylinder of the internal combustion engine. A check is made whether the measured signal for the intake manifold pressure deviates from the reference signal for the intake manifold pressure by more than a predefined tolerance range. In this case an erroneous operation of the intake and/or exhaust valves is detected; otherwise an error-free operation of the intake and/or exhaust valves is detected.Type: GrantFiled: March 19, 2008Date of Patent: December 22, 2009Assignee: Robert Bosch GmbHInventors: Dirk Hartmann, Georg Mallebrein, Werner Mezger, Henri Barbier, Soenke Mannal
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Patent number: 7631551Abstract: A method of determining a barometric pressure of atmosphere, in which an internal combustion engine of a vehicle is located includes monitoring operating parameters of the internal combustion engine and the vehicle, determining a healthy status of an air filter of the internal combustion engine, and calculating the barometric pressure based on the operating parameters and the healthy status of the air filter.Type: GrantFiled: July 27, 2007Date of Patent: December 15, 2009Assignee: GM Global Technology Operations, Inc.Inventors: Wenbo Wang, John F. Van Gilder, Jill A Slimmer-Velez, Kurt D. Mc Lain, Michael A. Kropinski
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Patent number: 7628061Abstract: There is described a method for detecting the ambient pressure by a pressure sensor in the intake pipe of an internal combustion engine. A throttle flap is opened so that the pressure drop via the throttle flap can be neglected. The dethrottling of the internal combustion engine is compensated by the appropriate adjustment of the cam shaft in accordance with the operating state of the internal combustion engine, so that the measuring method is not being felt by the driver.Type: GrantFiled: July 27, 2006Date of Patent: December 8, 2009Assignee: Siemens AktiengesellschaftInventors: Jürgen Dingl, Gerhard Eser, Gerhard Schopp
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Publication number: 20090277257Abstract: A sensor for an engine manifold is provided that includes a sensing component positioned within the engine manifold and responsive to a condition, such as temperature or pressure, within the engine manifold. The sensor includes a shield partially surrounding the sensing component upstream of the sensing component in flow within the manifold, which includes exhaust gases and manifold intake air. The shield does not surround a downstream side of the sensing component. The shield minimizes contamination of the sensing component by contaminants within the exhaust gases or manifold intake air, without compromising responsiveness of the sensing component to changes in the sensed condition, as the sensing component is still directly open to the manifold air (i.e., the exhaust gases and intake air).Type: ApplicationFiled: May 12, 2008Publication date: November 12, 2009Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventor: Chris Edward Tuski
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Publication number: 20090188307Abstract: An abnormality determination apparatus for an intake amount control mechanism according to the invention includes a control portion which sets an allowable range of an opening amount of a throttle valve which provided in an intake passageway of an internal combustion engine based at least on an index value of an engine operation state, including an operation amount of accelerator, and on a lift working angle of an intake valve, and which determines that an abnormality is present in a state of driving of the throttle valve if an actual opening amount of the throttle valve is outside the allowable range set.Type: ApplicationFiled: March 23, 2009Publication date: July 30, 2009Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naohide Fuwa, Kiyoo Hirose, Yuuji Miyanoo, Yuichiro Ido
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Patent number: 7562565Abstract: A procedure is introduced to test the functional capability of a secondary air system of an internal combustion engine, wherein values of a pressure are acquired, which arises in the secondary air system between the secondary air pump and a secondary air flow cross section, which can be controlled, when the secondary air pump is activated and the actuation of the secondary air flow cross section is increased; in that a measurement for the pressure is developed from the acquired values and is compared with a set point value, and the functional capability of the secondary air system is assessed as a function of a result of the comparison.Type: GrantFiled: May 4, 2007Date of Patent: July 21, 2009Assignee: Robert Bosch GmbHInventors: Detlef Heinrich, Dierk Rommel, Martin Schaeffler, Andreas Beer
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Publication number: 20090164144Abstract: A method for estimating pump torque of a computer-controlled fuel injection heat engine for a motor vehicle. The method determines the pumping torque in a for of a relative pumping torque representative for total pumping torque contribution of an intake and exhaust valve system, wherein the relative pumping torque is determined by a relation factoring in engine cubic capacity, a pressure difference, an exhaust pressure differential estimation due to the presence of the exhaust valves, and an intake pressure differential estimation due to the presence of the intake valves.Type: ApplicationFiled: October 20, 2005Publication date: June 25, 2009Applicant: RENAULT S.A.S.Inventors: Christophe Mounetou, Jerome Cruchet
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Patent number: 7546760Abstract: A device for intake manifold pressure-based determination of the air mass flowing into the cylinder combustion chamber is provided. A logic unit determines the inflowing air mass based on the intake manifold pressure using a calculation model for load detection that determines the intake manifold pressure in an upper partial range of the intake manifold pressure. A sensor device for direct detection of the intake manifold pressure measures the intake manifold pressure only in a lower partial range of the intake manifold pressure in the internal combustion engine. The logic unit determines the inflowing air mass as a function of the intake manifold pressure measured by the sensor deice when within the lower partial range of the intake manifold pressure, and based on the intake manifold pressure determined by use of the calculation model when within the upper partial range.Type: GrantFiled: March 27, 2008Date of Patent: June 16, 2009Assignee: Bayerische Motoren Werke AktiengesellschaftInventors: Heiko Konrad, Maximilian Engl
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Publication number: 20090025469Abstract: A method of determining a barometric pressure of atmosphere, in which an internal combustion engine of a vehicle is located includes monitoring operating parameters of the internal combustion engine and the vehicle, determining a healthy status of an air filter of the internal combustion engine, and calculating the barometric pressure based on the operating parameters and the healthy status of the air filter.Type: ApplicationFiled: July 27, 2007Publication date: January 29, 2009Inventors: Wenbo Wang, John F. Van Gilder, Jill A. Slimmer-Velez, Kurt D. McLain, Michael A. Kropinski
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Publication number: 20090025466Abstract: The test equipment of engine motoring of the present invention includes a conveying mechanism (30) that carries in and carries out an engine to and from a test position, a fixing mechanism (40) that fixes the engine carried in to the test position, a coupling mechanism (60) that directly couples an electrical motor (50) to the engine and can detect a drive torque, an encoder (70) that generates a pulse signal as an operating standard in synchronism with rotation of the electrical motor, a plurality of detection units (80 through 130) that are driven to reciprocate so as to be connected to and disconnected from or approach and separate from the engine positioned at the test position and detect a plurality of operating state quantities, a control means (200) for various driving controls, and a judging means (200) for judging whether the engine is normal by comparing information obtained by the plurality of detection units with standard information obtained in advance.Type: ApplicationFiled: December 12, 2003Publication date: January 29, 2009Inventors: Hitoshi Moritani, Masahide Maeda, Yoshio Kikukawa, Ryosei Sekiguchi, Tomoya Umeda
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Publication number: 20080314132Abstract: In a non-critical pressure region where a pressure ratio [Pm/Pthrup(i?1)] of an intake air pressure Pm(throttle downstream pressure) detected by an intake air pressure sensor to a previous throttle upstream pressure Pthrup(i?1) is greater than a predetermined value B, the previous throttle upstream pressure Pthrup(i?1) is substituted for one of two terms of the throttle upstream pressures Pthrup(i) included in an intake system model so that present throttle upstream pressure Pthrup(i) is calculated. In a critical pressure region where the pressure ratio is less than or equal to the predetermined value B, a physical value f(Pm/Pthrup(i)) using a pressure ratio [Pm/Pthrup(i)] of the intake air pressure Pm to a present throttle upstream pressure Pthrup(i) as a parameter is regarded as a steady value fc so that the present throttle upstream pressure Pthrup(i) is calculated.Type: ApplicationFiled: May 13, 2008Publication date: December 25, 2008Applicant: DENSO CORPORATIONInventors: Tomoaki Nakano, Atsushi Koike
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Patent number: 7441450Abstract: A method of monitoring air flow restriction in an air intake of an internal combustion engine includes monitoring a plurality of manifold absolute pressure (MAP) samples and determining respective MAP thresholds corresponding to each of the MAP samples. Each of the MAP samples is compared to its respective MAP threshold. A percentage of failed MAP samples is determined based on the comparing and an over-restricted air intake condition is selectively indicated based on the percentage of failed MAP samples.Type: GrantFiled: January 31, 2007Date of Patent: October 28, 2008Assignee: GM Global Technology Operations, Inc.Inventors: Kurt D. Mc Lain, Wenbo Wang, Michael A. Kropinski
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Publication number: 20080250862Abstract: A pressure sensor device includes a temperature sensor mounted on a common housing composed of a resin head and a resin pipe both hermetically connected to each other. The pressure sensor device is mounted on, for example, on an intake manifold of an internal combustion engine to measure an amount of air supplied to the engine based on detected pressure and temperature of the air. A pressure sensor is mounted on the resin head, and a temperature sensor element is supported in the resin pipe. A lead wire of the temperature sensor element such as a thermistor is electrically connected to a conductor bar embedded in the resin pipe. The temperature sensor is directly exposed to the air in the intake manifold, and a size of the temperature sensor and the lead wire is made small to make a response speed of the temperature sensor element high.Type: ApplicationFiled: February 29, 2008Publication date: October 16, 2008Applicant: DENSO CORPORATIONInventor: Hideki Nakabayashi
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Publication number: 20080236267Abstract: A method and a device for monitoring the intake manifold pressure of an internal combustion engine in which a measured signal for the intake manifold pressure is compared with a reference signal for the intake manifold pressure. For a deviation of the measured signal for the intake manifold pressure from the reference signal for the intake manifold pressure, a tolerance range is predefined for error-free operation of the intake and/or exhaust valves of at least one cylinder of the internal combustion engine. A check is made whether the measured signal for the intake manifold pressure deviates from the reference signal for the intake manifold pressure by more than a predefined tolerance range. In this case an erroneous operation of the intake and/or exhaust valves is detected; otherwise an error-free operation of the intake and/or exhaust valves is detected.Type: ApplicationFiled: March 19, 2008Publication date: October 2, 2008Inventors: Dirk Hartmann, Georg Mallebrein, Werner Mezger, Henri Barbier, Soenke Mannal
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Publication number: 20080236266Abstract: A method for diagnosing a turbocharger (10) includes disconnecting the compressor outlet conduit (26) so that the engine (12) is naturally aspirated and using the engine to drive the turbine (14) of the turbocharger. The compressor outlet conduit (26) has a restriction (28) to create a backpressure which is measured along with the inlet pressure, barometric pressure and ambient temperature. The flow rate is determined and compared to acceptable parameters from a map data provided by a turbocharger manufacturer to diagnose if the turbocharger is operating within the acceptable parameters.Type: ApplicationFiled: March 2, 2007Publication date: October 2, 2008Inventor: Jason Thomas Barton
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Publication number: 20080229816Abstract: A device for intake manifold pressure-based determination of the air mass flowing into the cylinder combustion chamber is provided. A logic unit determines the inflowing air mass based on the intake manifold pressure using a calculation model for load detection that determines the intake manifold pressure in an upper partial range of the intake manifold pressure. A sensor device for direct detection of the intake manifold pressure measures the intake manifold pressure only in a lower partial range of the intake manifold pressure in the internal combustion engine. The logic unit determines the inflowing air mass as a function of the intake manifold pressure measured by the sensor device when within the lower partial range of the intake manifold pressure, and based on the intake manifold pressure determined by use of the calculation model when within the upper partial range.Type: ApplicationFiled: March 27, 2008Publication date: September 25, 2008Applicant: Bayerische Motoren WerkeInventors: Heiko KONRAD, Maximilian Engl
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Publication number: 20080202224Abstract: There is described a method for detecting the ambient pressure by means of a pressure sensor in the intake pipe of an internal combustion engine. A throttle flap is opened so that the pressure drop via the throttle flap can be neglected. The dethrottling of the internal combustion engine is compensated by the appropriate adjustment of the cam shaft in accordance with the operating state of the internal combustion engine, so that the measuring method is not being felt by the driver.Type: ApplicationFiled: July 27, 2006Publication date: August 28, 2008Inventors: Jurgen Dingl, Gerhard Eser, Gerhard Schopp