Fluid Pressure Control Patents (Class 477/45)
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Patent number: 8753248Abstract: A vehicle and a method for controlling the vehicle are capable of preventing slip of a belt of a continuously variable transmission at an appropriate timing. A control unit included in the vehicle includes a state information obtaining unit that obtains information indicating a state of a torque damping mechanism provided on a torque transmission path between a second pulley of a continuously variable transmission and a drive wheel, and a clamping force changing processing unit that changes the clamping forces of the first pulley of the continuously variable transmission and the second pulley, based on the state of the torque damping mechanism.Type: GrantFiled: October 22, 2010Date of Patent: June 17, 2014Assignee: Yamaha Hatsudoki Kabushiki KaishaInventor: Hideyuki Fujita
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Patent number: 8753247Abstract: A motorcycle capable of reducing and minimizing a period of time in which air that is immixed into hydraulic oil due to a vehicle body being inclined in a left-right direction stays in the hydraulic oil, includes an oil pump to feed hydraulic oil to an oil chamber of a primary pulley and an oil chamber of a secondary pulley, and a first control valve. The first control valve includes a discharge port to discharge the hydraulic oil from a first oil passage continuously from the oil pump to the oil chamber. Under normal control, the controller operates the first control valve based on the driving state of the motorcycle. Further, the controller determines whether or not the inclination of the motorcycle exceeds a predetermined threshold, and when the inclination of the motorcycle exceeds the predetermined threshold, the controller operates the first control valve such that the discharge port is prevented from being closed.Type: GrantFiled: April 15, 2009Date of Patent: June 17, 2014Assignee: Yamaha Hatsudoki Kabushiki KaishaInventor: Yasunori Mano
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Patent number: 8744708Abstract: Surplus pressure is obtained from a difference between a hydraulic pressure value detected by a hydraulic pressure sensor and a target supplied hydraulic pressure. A determination is made about whether or not a possible hydraulic pressure in a prescribed time will become lower than a minimum required hydraulic pressure based on a current surplus pressure and a changing rate of the surplus pressure. If the possible hydraulic pressure is lower than the minimum required hydraulic pressure, correction is conducted to increase supplied hydraulic pressure. Accordingly, control is conducted so that the regularly required surplus pressure can be reduced to a minimum required amount.Type: GrantFiled: April 11, 2012Date of Patent: June 3, 2014Assignee: Honda Motor Co., Ltd.Inventors: Hirohiko Totsuka, Hitoshi Takayama
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Patent number: 8594898Abstract: In an apparatus for controlling a belt type CVT connected to an engine (prime mover) mounted on a vehicle through a forward clutch to change power of the engine in speed and transmit the power to a driven wheel of the vehicle, it is configured to determine whether it is in a predetermined operating condition where an operator is likely to apply a panic brake or the like, set a first value as a friction coefficient ? of the clutch to calculate and control a desired supply hydraulic pressure based on the first value when the determination result is negative, and set a second value greater than the first value to calculate and control the desired supply hydraulic pressure based on the second value when the determination result is affirmative.Type: GrantFiled: July 5, 2010Date of Patent: November 26, 2013Assignee: Honda Motor Co., Ltd.Inventor: Hirohiko Totsuka
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Patent number: 8585544Abstract: A drive force control system includes a shifting demand judging means that judges whether or not a torque capacity of the clutch is relatively high, and a condition for changing the speed change ratio of the continuously variable transmission stepwise is satisfied; and a first shifting means that reduces the torque capacity of the clutch before changing the speed change ratio of the continuously variable transmission, to synchronize a rotational speed of the internal combustion engine with an input speed of the continuously variable transmission to be attained after changing the speed change ratio thereof while changing the speed change ratio of the continuously variable transmission, and to increase the torque capacity of the clutch after changing the speed change ratio of the continuously variable transmission, when changing the speed change ratio of the continuously variable transmission stepwise.Type: GrantFiled: March 9, 2009Date of Patent: November 19, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventor: Tomoyuki Honda
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Publication number: 20130260960Abstract: A control device for continuously variable transmission is composed of a continuously variable transmission mechanism and friction engagement elements, and includes a control unit for decreasing, during a coast stop control to stop a driving power source in a traveling state of a vehicle, a transmission torque capacity transmittable by the friction engagement elements to fall under a belt capacity being torque transmittable by a belt using a holding force of pulleys.Type: ApplicationFiled: March 8, 2013Publication date: October 3, 2013Applicant: JATCO LTDInventors: Noritaka AOYAMA, Hideshi WAKAYAMA, Naohiro YAMADA, Keichi TATEWAKI, Kousuke WAKU
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Patent number: 8532889Abstract: A variator torque control system adjusts a variator output so that the actual output torque of the variator closely matches an expected output torque. In an example, pressure values of an existing torque control map are supplemented in real time with calculated pressure supplement values based on the current operation of the variator. The pressure supplement value for each mapped pressure value may be derived based on a prior application of the same or another map value.Type: GrantFiled: July 6, 2011Date of Patent: September 10, 2013Assignee: Caterpillar Inc.Inventors: Frank A. Demarco, Brian D. Kuras
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Patent number: 8504262Abstract: A control apparatus for an automatic transmission includes a torque calculator configured to calculate a torque required during a speed change for a hydraulic clutch at a target speed stage based on an output torque of an engine. A supply fluid pressure calculator is configured to obtain, from the calculated torque, a supply fluid pressure to be supplied to the hydraulic clutch by using a clutch friction coefficient. A fluid supplier is configured to supply the obtained supply fluid pressure to the hydraulic clutch to perform the speed change for an output of the engine through a gear corresponding to the target speed stage. A clutch plate temperature estimating device is configured to estimate a plate temperature of the hydraulic clutch. A fluid pressure correcting device is configured to correct the supply fluid pressure based on the estimated plate temperature.Type: GrantFiled: July 26, 2010Date of Patent: August 6, 2013Assignee: Honda Motor Co., Ltd.Inventors: Kazuma Sasahara, Takashi Maehara, Makoto Kobayashi
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Patent number: 8478474Abstract: A diagnostic apparatus and a diagnostic method are provided for a belt squeezing force adjusting mechanism of a continuously variable transmission in which a belt is wound around a primary sheave that receives driving force and a secondary sheave that outputs force to a drive line, and which continuously changes the output rotation speed by adjusting the width of the groove the primary sheave and the secondary sheave by shift control. This diagnostic determines, as a precondition, whether a target control value calculated in shift control is in a low region, and performs a diagnostic on the belt squeezing force adjusting mechanism based on the relationship between an actual control value and the target control value during control to reduce a control value when it is determined that the precondition is satisfied. According to this diagnostic apparatus and diagnostic method, an erroneous diagnosis can be prevented so the diagnostic can be performed accurately.Type: GrantFiled: January 30, 2009Date of Patent: July 2, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yasunari Matsui, Akira Hino, Shinya Toyoda, Naoto Tanaka
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Patent number: 8439798Abstract: In a hydraulic apparatus for an automatic transmission having a torque converter with a lockup clutch and CVT, there are provided a first control valve for controlling hydraulic pressure supply to the lockup clutch oil chamber, a first electromagnetic solenoid valve for controlling operation of the first control valve, a second control valve for controlling hydraulic pressure supply to the CVT pulleys, a second electromagnetic solenoid valve for controlling operation of the second control valve, a switching valve interposed between the oil chamber and the first control valve. In the apparatus, when detecting that the first control valve or first electromagnetic solenoid valve is failed and the lockup clutch is locked in engaged condition, current supply to the second electromagnetic solenoid valve is stopped so that it operates the switching valve to disengage the lockup clutch, thereby enabling to forcibly release the engagement without manipulation by the operator.Type: GrantFiled: September 9, 2010Date of Patent: May 14, 2013Assignee: Honda Motors Co., LtdInventors: Keiichi Hanyu, Genso Igari, Akihira Aoki
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Patent number: 8414452Abstract: A power transmission device is installed in a vehicle and connected to a power generation source that is capable of outputting power for driving. The power transmission device includes a belt-type continuously variable transmission; a working fluid accumulation portion; a friction engagement element; a first pump; a pressure regulating valve; a friction engagement element pressure regulating valve; a second pump; and a switching valve.Type: GrantFiled: January 13, 2010Date of Patent: April 9, 2013Assignee: Aisin AW Co., Ltd.Inventors: Haruki Shirasaka, Masahiro Ito, Tetsuya Shimizu, Kazunori Ishikawa, Kazuhiko Kato, Kenichi Tsuchida, Nobuo Suzuki
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Patent number: 8414453Abstract: An inertia torque input into the continuously variable speed change mechanism from the subtransmission mechanism is estimated during the shift in the subtransmission mechanism. During the shift in the subtransmission mechanism, a required oil pressure, which is an oil pressure required to maintain a contact frictional force between the respective pulleys and the wrapped member, is calculated on the basis of an input torque into the continuously variable speed change mechanism and the inertia torque.Type: GrantFiled: August 24, 2010Date of Patent: April 9, 2013Assignee: Jatco LtdInventors: Ryousuke Nonomura, Takashi Eguchi, Tomohiro Utagawa, Keita Okudaira
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Patent number: 8403810Abstract: A system and method for controlling the torque transferable by a mechanical drive between an engine and a shaft of a vehicle includes a first actuator which acts on a variable-speed drive, a second actuator which acts on a clutch to determine the degree of engagement/release of the clutch; and a measuring device for measuring the torque to or from the variable-speed drive. The first and second actuators and the measuring device are controlled by an electronic central control unit to protect the variable-speed drive and/or the clutch from mechanical overloading of the mechanical drive.Type: GrantFiled: February 19, 2010Date of Patent: March 26, 2013Assignee: CNH America LLCInventors: Massimo Baroni, Francesco Roli, Eugenio Sereni
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Patent number: 8392077Abstract: A linear solenoid is configured with an electromagnetic coil and a label resistor that are integrated with each other; the label resistor has a resistance value corresponding to a correction coefficient based on the difference between the actual characteristic of the supply current vs. adjusted hydraulic pressure output of the electromagnetic coil and a standard characteristic; and data for correcting a characteristic variation in the command current vs. output current characteristic of an electromagnetic coil is preliminarily stored in a control module by use of an adjustment tool. When the operation is started, the resistance value of the label resistor is read and an output current corresponding to a utilized linear solenoid is supplied, so that a target adjusted hydraulic pressure is obtained.Type: GrantFiled: August 29, 2012Date of Patent: March 5, 2013Assignee: Mitsubishi Electric CorporationInventors: Shozo Kanzaki, Fumiaki Arimai, Hiroyoshi Nishizaki
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Patent number: 8353805Abstract: A hydraulic supply system for a hydraulically actuated automatic transmission, in particular for a belt-driven conical-pulley transmission. The system includes a primary pump driven by a primary drive system to provide pressure in a supply line connected to a regulating valve. The supply line is connected through a pilot valve to a control line in which a control valve is situated, with which the pressure that determines the setting of a transmission ratio adjusting valve is set. An auxiliary pump driven by an auxiliary drive system that is separate from the primary drive system includes an outlet line connected to the control line through a first valve that opens in the direction of the control line, and is connected to the supply line through a second valve that opens in the direction of the supply line.Type: GrantFiled: December 10, 2008Date of Patent: January 15, 2013Assignee: Schaeffler Technologies AG & Co. KGInventors: Jochen Pfister, Reinhard Stehr, Eric Müller, Roshan Willeke
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Patent number: 8311691Abstract: An HV-ECU performs a step of detecting an atmospheric pressure, a step of calculating a maximum value of a boost voltage corresponding to the atmospheric pressure by using a map, and a step of setting the maximum value as a system voltage value and controlling a DC/DC converter. Moreover, the HV-ECU may calculate a resistance value of a gate resistance of a switching element corresponding to the atmospheric pressure by using the map and control the gate resistance to achieve the set resistance value.Type: GrantFiled: September 8, 2006Date of Patent: November 13, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventor: Katsunari Matsumoto
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Patent number: 8306708Abstract: A control device for a vehicular automatic transmission which can realize a shifting with quickened response with suppressing a turbine blow-up during the shifting is provided. When a response in hydraulic pressure control by a hydraulic pressure control circuit 42 fails to satisfy a preset predetermined determining criterion, a shifting response is prevented from improving, in comparison to a case where the determining criterion is satisfied. Under a relatively low response of the hydraulic pressure control by the hydraulic pressure control circuit 42 due to air mixture to working oil, a control to inhibit a high-response shifting or the like is performed, so that a turbine blow-up caused by a delayed response of hydraulic pressure can be prevented. Thus, the control device for the vehicular automatic transmission can be provided, which can realize the shifting with quickened response, with suppressing the turbine blow-up during the shifting.Type: GrantFiled: September 2, 2009Date of Patent: November 6, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Keisuke Ota, Hitoshi Matsunaga, Koji Oshima
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Patent number: 8306707Abstract: A system and method of dithering speed and/or torque for shifting a transmission of a vehicle having an engine, a reversible, variable displacement hydraulic motor/pump which can be driven by the engine, a hydraulic accumulator supplied by said motor/pump, and at least one reversible hydraulic driving motor for propelling the vehicle supplied with fluid by the hydraulic accumulator and/or by said motor/pump operating as a pump. A transmission unit connects the engine with the variable displacement hydraulic motor/pump during a first mode of operation (city mode) and connects the engine to a vehicle drive wheel during a second mode of operation. The system utilizes stored hydraulic energy to dither the output of the driving motor in order to achieve quick and smooth shifts between city and highway mode, or between various ranges within the city mode.Type: GrantFiled: November 10, 2008Date of Patent: November 6, 2012Assignee: Parker-Hannifin CorporationInventors: Yisheng Zhang, John Loeffler
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Patent number: 8292782Abstract: A belt continuously-variable transmission control apparatus includes: a belt continuously-variable transmission including; a primary pulley arranged to receive a torque from a driving source; a secondary pulley arranged to output the torque to driving wheels; a belt wound around the primary pulley and the secondary pulley; a hydraulic pressure control section configured to control a hydraulic pressure of one of the primary pulley and the secondary pulley which is a capacity side, and thereby to bring the belt, the primary pulley and the secondary pulley to a slip state; and a torque control section configured to control the torque of the driving source, and thereby to bring the slip state to a predetermined slip state.Type: GrantFiled: December 17, 2009Date of Patent: October 23, 2012Assignees: Jatco Ltd, Nissan Motor Co., Ltd.Inventors: Tsuyoshi Yamanaka, Shigeru Ishii, Shigeki Shimanaka
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Patent number: 8287409Abstract: A hydraulic control system of continuously variable transmission includes: a first sheave pressure regulating valve (17) that regulates a line pressure (Pl), which is used for hydraulic control as a source pressure, to obtain a first sheave pressure (Pin); a fail-safe valve (19) that selects and outputs any one of the first sheave pressure (Pin) or a fail-safe hydraulic pressure (second sheave pressure Pout) that is applied to a drive pulley (21) at the time of a failure due to an excessive first sheave pressure (Pin) to the drive pulley (21); and a first regulator valve (12) and a second regulator valve (13) that regulate the line pressure (Pl). An output pressure (Psf) of the fail-safe valve (19) is supplied to the first and second regulator valves (12 and 13) in a feedback manner as a drive pulley (21) side hydraulic pressure to thereby regulate the line pressure (Pl).Type: GrantFiled: December 23, 2008Date of Patent: October 16, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yusuke Ogata, Toshihiro Aoyama
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Patent number: 8285463Abstract: A method and control system for operating a transmission includes a transmission control module determining a transmission sensor signal and a transmission pressure sensor offset prior to starting a vehicle engine and an engine start initiator starting the vehicle engine. The transmission control module controls a transmission function in response the transmission pressure sensor offset and the pressure sensor signal.Type: GrantFiled: August 11, 2009Date of Patent: October 9, 2012Inventors: Robert L. Moses, Ronald F. Lochocki, Jr.
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Patent number: 8275510Abstract: An ECU executes a program including the steps of determining that a change speed solenoid is abnormal when a target speed ratio falls within a predetermined range, an upshift is recognized and the change speed solenoid is abnormal; determining that the change speed solenoid is normal when the change speed solenoid is not abnormal; determining that a belt pinch pressure solenoid is abnormal when the target speed ratio is substantially equal to a speed ratio ?min on a maximum speed-increase side and the target speed ratio is not substantially equal to an actual speed ratio; and determining that the belt pinch pressure solenoid is normal when the target speed ratio is substantially equal to the actual speed ratio.Type: GrantFiled: July 25, 2008Date of Patent: September 25, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Naoto Tanaka, Shinya Toyoda, Naoya Inoue, Tadashi Tamura, Akira Hino, Yasunari Matsui
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Patent number: 8226529Abstract: A sensor is placed in proximity to a chain of a continuously variable transmission, and a pulse is output by detecting pins. Moreover, there is provided a control section that determines theoretical speed of the chain from numbers of input and output rotations of the continuously variable transmission; that determines actual speed of the chain from an output from the sensor; that determines slippage from the speeds; and that controls clamping force of the continuously variable transmission so as to make slippage close to a reference value.Type: GrantFiled: October 19, 2007Date of Patent: July 24, 2012Assignee: JTEKT CorporationInventors: Yves Rothenbuhler, Shigeo Kamamoto
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Patent number: 8195369Abstract: An ECU executes a program that includes a step of increasing belt squeezing pressure to a value P (ON) greater than a normal value P (OFF) that is set as the belt squeezing pressure when a footbrake switch is off, when the footbrake switch is on and the time elapsed after the footbrake switch was turned on is less than a threshold value T (0); and a step of gradually reducing the belt squeezing pressure to the normal value P (OFF) when the time elapsed after the footbrake switch was turned on is equal to or greater than the threshold value. As a result, a decrease in fuel efficiency of a vehicle in which a continuously variable transmission is mounted, as well as a reduction in the durability of a belt of this continuously variable transmission, can be reduced.Type: GrantFiled: October 2, 2007Date of Patent: June 5, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Daisuke Inoue, Tadashi Tamura
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Publication number: 20120135837Abstract: A time required until the friction element is completely engaged is delayed when a switch from a non-driving position to a driving position is detected or when the engine automatic stop condition no longer holds until the differential rotation of the friction element disappears after the engine automatic stop condition holds as compared with the case where the switch from the non-driving position to the driving position is detected or the engine automatic stop condition no longer holds after the differential rotation of the friction element disappears.Type: ApplicationFiled: November 22, 2011Publication date: May 31, 2012Inventors: Kousuke Waku, Masayuki Miyazono, Hideshi Wakayama
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Patent number: 8185283Abstract: First target torque of an engine is set based on a driver's operation, a vehicle behavior, and a request for shifting gears of an automatic transmission. The engine is controlled such that the difference between the first target torque and the actual output torque of the engine is reduced. Detection torque is calculated from an operation state of the engine. In consideration of dead time in control of the engine, calculation torque is calculated from the first target torque. In addition, first lookahead torque with the dead time in the engine being removed is calculated by feedback-correcting the first target torque according to an error e between the detection torque and the calculation torque.Type: GrantFiled: June 24, 2009Date of Patent: May 22, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Seiji Kuwahara, Toshiya Oishi, Shogo Matsumoto
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Method and apparatus to control operation of a hydraulic pump for an electro-mechanical transmission
Patent number: 8170762Abstract: A method for controlling a hydraulic flow within a powertrain comprising an electromechanical transmission mechanically-operatively coupled to an engine adapted to selectively transmit power to an output, wherein the transmission utilizes a hydraulic control system serving a number of hydraulic oil consuming functions includes monitoring minimum hydraulic pressure requirements for each of the functions, determining a requested hydraulic pressure based upon the monitoring minimum hydraulic pressure requirements and physical limits of the hydraulic control system including a maximum pressure, determining a desired flow utilizing a hydraulic control system flow model based upon the requested hydraulic pressure, and utilizing the desired flow to control an auxiliary hydraulic pump.Type: GrantFiled: October 13, 2008Date of Patent: May 1, 2012Assignees: GM Global Technology Operations LLC, Daimler AG, Chrysler LLC, Bayerische Motoren Werke AktiengesellschaftInventors: Michael D. Foster, Eric S. Tryon, Jy-Jen F. Sah, Ali K Naqvi -
Patent number: 8165772Abstract: A method of managing slip in a transmission that is driven by a prime mover includes determining whether a slip condition of the transmission is present based on a slip value and reducing a torque output of the prime mover based on a torque reduction value when the slip condition is present. The method further includes storing the torque reduction value in an array if the slip condition is resolved as a result of the step of reducing and identifying a faulty component within the transmission based on the array.Type: GrantFiled: April 25, 2007Date of Patent: April 24, 2012Inventor: Todd J. Thor
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Patent number: 8118697Abstract: A simplified continuously variable transmission system control provides a variable clamping force and a differential cylinder pressure manipulation to change sheave ratios. The system control uses two pumps. The first pump provides the variable clamping force. The second pump provides pressure changes to effect ratio changes. The clamping force can be varied based upon operator demand on an associated engine.Type: GrantFiled: October 11, 2010Date of Patent: February 21, 2012Inventor: Albert W. Brown
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Patent number: 8105191Abstract: The line hydraulic pressure setting portion sets the line hydraulic pressure PL, which is the base pressure for the required shift control pressure Pin and the required belt clamping pressure Pd, based on the higher of the required pressures Pin and Pd. At this time, if the continuously variable transmission is to be shifted up, the required Pin calculating portion calculates the required shift control pressure Pin based on one of the target speed ratio ?* and the actual speed ratio ? with which the required shift pressure Pv is calculated to be higher than with the other. As such, the required shift control pressure Pin is set to the minimum necessary level for shifting up the continuously variable transmission and the line hydraulic pressure PL is appropriately set to a level for obtaining the required shift control pressure Pin.Type: GrantFiled: June 11, 2007Date of Patent: January 31, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shinya Toyoda, Hiroji Taniguchi, Yoshinobu Soga
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Patent number: 8096906Abstract: When a vehicle decelerates rapidly, a lower limit secondary pulley pressure (Plmt) is calculated on the basis of a primary pulley rotation speed (Npri) detected by a primary pulley rotation sensor. When a deceleration speed (Gdata) is greater than a predetermined deceleration speed (G1) and a secondary pulley pressure (Psec) detected by a secondary pulley pressure sensor is lower than the lower limit secondary pulley pressure (Plmt), it is determined that slippage is about to occur in a V-belt 4 on a primary pulley side in particular, and therefore speed ratio fixing control is performed.Type: GrantFiled: December 13, 2007Date of Patent: January 17, 2012Assignee: Jatco LtdInventors: Takuichiro Inoue, Hiroki Iwasa, Hiroyasu Tanaka, Yoshihisa Kodama
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Patent number: 8092341Abstract: A method of controlling a transmission (e.g., CVT) comprises dividing the entire range of an input torque to a transmission from an engine into a plurality of partial torque ranges; setting the maximum torque of the respective partial torque ranges as a representative torque of the respective partial torque ranges; and setting a target hydraulic pressure, which is to be provided to the transmission, according to the representative torque and a predetermined target speed ratio. The method allows a target hydraulic pressure for controlling a transmission to be maintained constant even though an input torque from an engine is changed, and allows the transmission to maintain a speed ratio constant, thereby ensure a stable and smooth ride.Type: GrantFiled: October 29, 2008Date of Patent: January 10, 2012Assignees: Kia Motors Corporation, Hyundai Motor CompanyInventor: Howook Lee
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Patent number: 8088036Abstract: A vehicle drive control device includes a continuously variable transmission mechanism (hereinafter referred to as CVT (6) of a torque control type capable of continuously varying a transmission gear ratio, and a controller (34) which controls operations of the CVT (6) and an engine (2). The controller (34) includes a first control section (43; 43A) which controls a torque of the CVT (6) based on a target transmission input torque (TTRN,T), and a second control section (44) which controls a torque of the engine (2) based on a target engine rotation speed (?e,T).Type: GrantFiled: September 29, 2006Date of Patent: January 3, 2012Assignee: JTEKT CorporationInventors: Robert Fuchs, Yasuhiko Hasuda
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Patent number: 8066595Abstract: A hydraulic control system for a vehicular drive system including a hydraulically operated belt-and-pulley type continuously variable transmission and a hydraulically operated frictional coupling device engaged for running of a vehicle, the hydraulic control system including: a first solenoid valve for regulating a belt-tensioning hydraulic pressure for tensioning a belt of the transmission, a second solenoid valve for regulating a transient coupling hydraulic pressure to be applied to the frictional coupling device in the process of an engaging action, a line-pressure regulating valve for regulating a line pressure used for hydraulically operated devices of the mechanism, and a hydraulic-circuit switching device operable to apply a control pressure of the second solenoid-operated valve to the line-pressure regulating valve after the frictional coupling device has been placed in a fully engaged state, and to apply a first control pressure of the first solenoid-operated valve to the line-pressure regulating vaType: GrantFiled: October 27, 2005Date of Patent: November 29, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yusuke Ogata, Yoshinobu Soga, Ryoji Habuchi
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Patent number: 8057354Abstract: Systems and methods for efficiently and effectively controlling the rate of change of ratio, not simply the ratio, in a CVT. By controlling the rate of change of ratio, the acceleration or deceleration of a vehicle can be controlled in an efficient manner. Furthermore, the rate of change of ratio can be controlled by controlling the clamping pressure of the pulleys and/or differential pressure between the pulleys with minimal slip by using a servo control mechanism adapted for control by a system controller based on equilibrium mapping and other control parameters.Type: GrantFiled: April 5, 2010Date of Patent: November 15, 2011Assignee: The Regents of the University of CaliforniaInventors: Andrew A. Frank, Thomas Dreumont
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Patent number: 7998006Abstract: In a speed ratio control device for a belt continuously variable transmission according to this invention, when a speed ratio is subjected to feedback control on the basis of a difference between an actual speed ratio and a target speed ratio, pressure supplied to a primary pulley is corrected through feedforward (S17, S18) in order to suppress variation in the groove width of the primary pulley caused by a rapid variation in an input torque into the primary pulley (S17) while traveling in a fixed speed ratio mode (S14) in which the target speed ratio is held at a fixed value.Type: GrantFiled: October 2, 2006Date of Patent: August 16, 2011Assignee: Jatco LtdInventors: Hironori Nihei, Tetsuya Izumi, Seonjae Kim, Fumito Shinohara, Kiyotaka Sawano, Takuya Numata
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Patent number: 7922610Abstract: In a line pressure control device for a belt type continuously variable transmission according to this invention, when a line pressure is feedback-controlled to equal a target line pressure which is equal to or greater than the larger of oil pressures supplied to a primary pulley and a secondary pulley (S1), and it is determined that the target line pressure has fallen below a first low pressure, leading to a divergence between the target line pressure and the actual line pressure (S6), the target line pressure is restricted such that the target line pressure does not fall below a lower limit value (S7).Type: GrantFiled: October 4, 2006Date of Patent: April 12, 2011Assignee: JATCO LtdInventors: Hironori Nihei, Tetsuya Izumi, Seonjae Kim, Fumito Shinohara, Toshiyuki Shibuya, Toshiji Iida
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Patent number: 7920949Abstract: A variator torque control system and method utilize a hydraulic actuator to control the variator output via a torque control map, wherein the values of the torque control map are evaluated and modified during use of the map to improve map accuracy. In an example, errors in the map are evaluated to determine whether a system fault has occurred.Type: GrantFiled: May 22, 2007Date of Patent: April 5, 2011Assignee: Caterpillar Inc.Inventors: Brian D Kuras, Frank A DeMarco, Adam J Vaccari, Tyler Bowan
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Patent number: 7908069Abstract: A method of operating a clutch during vehicle launch including increasing a first hydraulic pressure in an inner chamber from a first to a second level; decreasing a second hydraulic pressure in an outer chamber from a third to a fourth level in response to engine speed and throttle position for the vehicle; and slipping the clutch in response to increasing and decreasing the first and second pressures, respectively. The first hydraulic pressure urges a clutch disposed between the engine and an impeller for a vehicle torque converter to an engaged position. The second hydraulic pressure opposes the first hydraulic pressure. In some aspects, the method includes determining a temperature for oil in a transmission in the vehicle. Then, decreasing the second hydraulic pressure includes decreasing the second pressure in response to the determined temperature. In some aspects, the clutch and the chambers are located in the torque converter.Type: GrantFiled: December 11, 2007Date of Patent: March 15, 2011Assignee: Schaeffler Technologies GmbH & Co. KGInventor: Jeremy Whitmer
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Patent number: 7892141Abstract: A speed ratio change control device for a belt type continuously variable transmission calculates a maximum thrust that can be generated by the primary pulley on the basis of an upper limit value of the line pressure, calculates an upper limit value of a shift speed on the basis of the maximum thrust, and sets the target speed ratio on the basis of the upper limit value of the shift speed.Type: GrantFiled: December 11, 2007Date of Patent: February 22, 2011Assignee: Jatco LtdInventors: Midori Yamaguchi, Fumito Shinohara, Yoshihisa Kodama
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Patent number: 7819764Abstract: A speed change control device for a belt type continuously variable transmission has a speed change control unit (32) which controls an oil pressure for determining a speed ratio of the continuously variable transmission (10) by operating a step motor (40), and detects a rotation speed of a primary pulley or a secondary pulley. A driving speed of the step motor (40) is limited using two or more of a temperature of a working oil of the speed change control unit (32), the speed ratio of the continuously variable transmission (10), and the detected rotation speed as parameters.Type: GrantFiled: January 12, 2007Date of Patent: October 26, 2010Assignee: JATCO LtdInventors: Yusuke Kimura, Tatsuo Ochiai
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Patent number: 7811188Abstract: A simplified continuously variable transmission system control provides a variable clamping force and a differential cylinder pressure manipulation to change sheave ratios. The system control uses two pumps. The first pump provides the variable clamping force. The second pump provides pressure changes to effect ratio changes. The clamping force can be varied based upon operator demand on an associated engine.Type: GrantFiled: May 23, 2008Date of Patent: October 12, 2010Inventor: Albert W. Brown
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Patent number: 7806790Abstract: A slippage detection system for a continuously variable transmission capable of continuously changing a ratio between a speed of rotation of an input member and a speed of rotation of an output member is provided. The slippage detection system calculates a correlation coefficient relating to the input rotation speed and the output rotation speed, based on a plurality of measurement values of the input rotation speed and a plurality of measurement values of the output rotation speed, and determines slippage of the torque transmitting member in the continuously variable transmission based on the calculated correlation coefficient.Type: GrantFiled: September 30, 2002Date of Patent: October 5, 2010Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kunihiro Iwatsuki, Kazumi Hoshiya, Yasuhiro Oshiumi, Yasunori Nakawaki, Masataka Osawa, Hiroyuki Nishizawa, Hiroyuki Yamaguchi, Hideyuki Suzuki
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Publication number: 20100210414Abstract: A discharge capacity reduction device that, while neutral control is performed, reduces the discharge capacity of an oil pump that is driven by the engine is provided, so that the load applied to the oil pump is reduced. Thus, the load applied to the engine is reduced and it is possible to further reduce the engine output, so that it is possible to further improve fuel economy.Type: ApplicationFiled: February 19, 2010Publication date: August 19, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Naoto Tanaka, Shinya Toyoda
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Patent number: 7768530Abstract: A method and apparatus for verifying operation of process variable transmitters in process control or monitoring systems is provided. A process variable is measured with a process variable transmitter to verify operation of the process variable transmitter by comparing the process variable with a reference. A data entry is placed in a database which indicates operation of the process variable transmitter has been verified.Type: GrantFiled: January 25, 2007Date of Patent: August 3, 2010Assignee: Fisher-Rosemount Systems, Inc.Inventors: Walter H. Sigtermans, Patrick M. Dobrowski
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Publication number: 20100167872Abstract: A vehicle drive apparatus for supplying oil pressure to a hydraulic servo at restart of an engine. The vehicle drive apparatus includes an accumulator that accumulates the oil pressure, an electromagnetic switching valve that retains oil pressure of the accumulator when an oil pump is stopped, a switching valve control unit that controls opening and closing of the electromagnetic switching valve, and a restart determining unit that determines whether or not to restart the vehicle drive source from a stopped state. When it is determined by the restart determining unit to restart the vehicle drive source, the switching valve control unit is started so as to supply the oil pressure accumulated in the accumulator to the hydraulic servo. As a result, engine friction engagement elements are quickly engaged to enable starting of a vehicle.Type: ApplicationFiled: December 14, 2009Publication date: July 1, 2010Applicant: AISIN AW CO., LTD.Inventors: Haruki SHIRASAKA, Noriyuki Tani, Yuji Iwatsuru, Masayoshi Kato, Takuji Akiyama, Shuichi Takeda, Masahiro Ito
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Publication number: 20100160111Abstract: A belt continuously-variable transmission control apparatus includes: a belt continuously-variable transmission including; a primary pulley arranged to receive a torque from a driving source; a secondary pulley arranged to output the torque to driving wheels; a belt wound around the primary pulley and the secondary pulley; a hydraulic pressure control section configured to control a hydraulic pressure of one of the primary pulley and the secondary pulley which is a capacity side, and thereby to bring the belt, the primary pulley and the secondary pulley to a slip state; and a torque control section configured to control the torque of the driving source, and thereby to bring the slip state to a predetermined slip state.Type: ApplicationFiled: December 17, 2009Publication date: June 24, 2010Inventors: Tsuyoshi YAMANAKA, Shigeru Ishii, Shigeki Shimanaka
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Patent number: 7739019Abstract: A rough road detection system for a vehicle comprises a first acceleration sensor that measures vertical acceleration of a component of the vehicle. An adaptive acceleration limits module determines a first acceleration limit based upon a speed of the vehicle. A limit comparison module generates a rough road signal based on a comparison of the first acceleration limit from the adaptive acceleration limits module and the measured acceleration from the first acceleration sensor.Type: GrantFiled: December 20, 2004Date of Patent: June 15, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Dominique Robert, Herve Scelers, Pascal Tissot
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Patent number: 7713166Abstract: Systems and methods for efficiently and effectively controlling the rate of change of ratio, not simply the ratio, in a CVT. By controlling the rate of change of ratio, the acceleration or deceleration of a vehicle can be controlled in an efficient manner. Furthermore, the rate of change of ratio can be controlled by controlling the clamping pressure of the pulleys and/or differential pressure between the pulleys with minimal slip by using a servo control mechanism adapted for control by a system controller based on equilibrium mapping and other control parameters.Type: GrantFiled: July 30, 2007Date of Patent: May 11, 2010Assignee: The Regents of the University of CaliforniaInventors: Andrew A. Frank, Thomas Dreumont
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Patent number: 7713165Abstract: A hydraulic control system for a continuously variable transmission for a hybrid electric vehicle enhances operability as speed changes are made based on input torques and engine rotational speeds since pressure of a primary pulley is controlled based on engine rotational speeds; applies a wide pressure range for solenoids in normal operation by deciding a limp home mode only when a secondary control solenoid valve (SCSV) and a ratio control solenoid valve (RCSV) are under maximum pressure at the same time; reuses flux discharged under reduced pressure from a secondary regulator valve in a lubrication control valve, thus saving energy; controls the lubrication pressure actively using PWM; and generates a pilot pressure for clutch control using a single valve when the transmission control unit fails.Type: GrantFiled: December 4, 2006Date of Patent: May 11, 2010Assignee: Hyundai Motor CompanyInventor: Hyun Suk Kim