Isuzu Motors Limited

Fujitsu Corporation

Izuzu Motors Limited

Toshihiro Hattori

Hitoshi Kasai

Yasuyoshi Asagi

Masaki Ishihara

Makoto Uriuhara

Noriaki Ogawa

Shigeki Moride

Katsuya Shishido

Hideo Saito

Hiroshi Yoshimura

Minoru Honma

Jyunzo Kuroyanagi

Nobuichi Uchiyama

A method of controlling the gear changing operation in an automatic transmission having a gear transmission actuatable by a gear changing actuator assembly controlled by an electronic control system. When operating the gear changing actuator assembly for a gear changing operation, an interval of time, which elapses after the gear changing actuator assembly is operated, is measured with a timer. The measured interval of time is compared with a preset interval of time. When a lock is detected as being caused at the time the gear changing operation is not completed within the preset interval of time, the gear changing actuator assembly is operated to a gear position different from a gear position which the gear changing actuator assembly has originally been operated to select.

Method of controlling gear changing operation in automatic transmission

Herein disclosed is a method of processing a malfunction of an accelerator pedal sensor of an automobile. An output voltage is outputted according to changes in a resistance depending upon depression of an accelerator pedal. A malfunction of the accelerator pedal sensor is shot to process and determine an acceleration value for controlling the run of the automobile in accordance with said output voltage. The acceleration value is set at a predetermined value in accordance with the malfunction of either of an idle switch for generating a signal indicating the idle position of the accelerator pedal and a wide-open switch for generating a signal indicating the wide open position of the accelerator pedal when the malfunction of the accelerator pedal sensor is judged. This judgement is conducted by detecting a plurality of times that said output voltage is outside of the predetermined voltage range. The acceleration value is set at a predetermined minimum value, when the idle switch is in a normal state, at a predetermined relatively high value, when the wide-open switch is in a normal state, and at a predetermined relative low value when both the two switches are troubled.

Method of processing malfunction of vehicular acceleration sensor

Herein disclosed is a signal processing system for a motor vehicle with high responsiveness to the will of a driver. The output voltage of an acceleration sensor using a potentiometer is converted into a digital value by an analog-digital converter. The nonlinearity of the output voltage is corrected by polynominally calculating the digital value. This digital value is controlled by a central processing unit which processes the digital value to generate an acceleration signal having a linear relationship to the changes in the resistance of the potentiometer during actuation of an accelerator. The central processing unit further includes a memory for storing the acceleration signal at an idling position to determine a calibrated acceleration signal using a ratio of an actual acceleration signal obtained from the accelerator pedal to the stored value thereof.

Signal processing system for vehicular acceleration sensor

A method of controlling a synchromesh type automatic transmission of a vehicle such as an automobile, including the steps of releasing a clutch for connecting an engine and the transmission in response to a speed change command, shifting the transmission from one speed position to a neutral position, shifting the transmission from the neutral position to a subsequent speed position, and applying the clutch. The double-clutching operation is conducted if a load upon synchronization during the speed changing operation exceeds a predetermined level, to once apply the clutch and subsequently release the clutch again while the transmission is in the neutral position. Thus, the synchronization load can be dropped to prevent any so-called 'under-synchronization' in the transmission. The synchronization load is detected in terms of the difference between the r.p.m. of the input shaft of the transmission and the product of the vehicle speed or the r.p.m. of the output shaft of the transmission and the reduction ratio.

Method of controlling automatic transmission

Herein disclosed is a revolution signal processing system for an electronic controller to ensure safe operation of a vehicle having an automatic transmission. The system includes: an input shaft revolution sensor for outputting an input shaft r.p.m. signal; a vehicle speed sensor for outputting a vehicle speed signal; signal processors for determining the r.p.m.'s of the two sensors in response to the two output signals of the same; a gear position sensor for outputting a gear position signal; a gear position detector for detecting the gear position of the automatic transmission; and a self-testing backup. When the gear position detector detects that the transmission is in a gear position other than the neutral position, and if one of the output signals of the two sensors exhibits an r.p.m. equal to or higher than a predetermined value, whereas the other of the same exhibits an abnormally lower value or an r.p.m. lower than the predetermined value, then the self-testing back up determines that the sensor having the output signal exhibiting the abnormally low value is malfunctioning. Thus, the revolution signal processing system self-tests and backs up the vehicle speed sensor and the input shaft revolution sensor.

Revolution signal processing system for vehicular electronic controller

A clutch control system includes an electronic control apparatus for controlling a clutch based on clutch control data stored through a learning process. The clutch control system has a sensor for measuring the temperature of lubricating oil in a gear transmission, a memory for storing a corrective clutch control value commensurate with the temperature of the lubricating oil, and an electronic control apparatus for correcting a learned value used to control the clutch with the corrective clutch control value obtained on the basis of the measured temperature of the lubricating oil.

Clutch control system with variable clutch connection position

A method of controlling a shifting operation of a synchro mesh type automatic transmission in a vehicle, such as an automobile. The method includes the steps of (i) detecting the running state of the vehicle, (ii) determining an optimum gear position from the vehicle running condition, (iii) determining if the optimum gear position is higher than a gear position of the transmission, (iv) determining if the engine torque is greater than or equal to a predetermined value and reducing the engine torque below the predetermined value, if the optimum gear position is higher than the gear position of the transmission, (v) disengaging a clutch to disconnect an engine and the transmission, (vi) shifting the transmission to the optimum gear position, and (vii) engaging the clutch. Moreover, the engine torque is reduced before the clutch is released--by reducing the fuel supply to the engine--so that abrupt decelerations and declutching shocks caused by conventional shifting methods are not felt by the driver.

Method of controlling automatic transmission in accordance with engine

An automatic clutch control system and method for controlling a clutch for an automatic transmission when a clutch stroke sensor fails. The apparatus includes a clutch actuator for controlling a clutch stroke, a plurality of solenoid valves for controlling the clutch actuator, a clutch stroke sensor for measuring the clutch stroke, a control unit for feeding back a stroke signal detected by the clutch stroke sensor when requests for clutch engagement or disengagement are received and for controlling the solenoid valves so as to obtain a clutch moving speed defined by an engine rotational speed and other driving conditions. The control unit further includes a clutch engagement control section and a clutch disengagement control section for controlling solenoid valves for operating the clutch independently of the stroke signal when the stroke sensor fails. The control unit detects a failure of the stroke sensor by defining an upper limit value and a lower limit value for the stroke signal and when the stroke signal exceeds the upper limit value or is lower than the lower limit value it is determined that the stroke sensor has failed. The method includes the steps of setting the upper and lower limit values for the stroke signal, detecting a clutch stroke sensor failure by determining if the value of the stroke signal exceeds the upper limit or is less than the lower limit and operating the clutch at a predetermined speed if a stroke sensor failure is detected.

Automatic clutch control system

A method of controlling the gear changing operation of an automatic transmission includes determining an optimum gear position based on a car speed and an extent of depression of an accelerator pedal to control a gear transmission to select the optimum gear position, and selecting neutral when the determined optimum gear position is lower than a selected gear position at the time the accelerator pedal is released, to interrupt the gear changing operation until the accelerator pedal is depressed.

Method of controlling automatic transmission in accordance with

A diagnostic processing system for the automatic transmission of an automobile to cooperate with an instruction element for producing an actuation signal for driving the transmission gears and clutch. The system is chiefly comprised of a gear position sensor which senses the gear position of the transmission gears and a diagnostic check element which determines, based on a gear position signal from the sensor and other information regarding the automobile's operation, the validity of the actuation signal.

Diagnostic processing system for automatic transmission of an automobile

An electronically controlled vehicle transmission has a gear shifting operation which is controlled by determining an optimum transmission gear based on shift map data stored in an electronic control device, a detected vehicle speed and a detected degree of depression and speed of movement of an accelerator pedal. If the accelerator pedal is abruptly depressed while the vehicle is running, such an abrupt depression is detected by a pedal speed detector which produces a signal to cause an electronic control device to interrupt the gear shifting operation. The electronic control device starts the gear shifting operation again after the accelerator pedal depression is stabilized.

Method and apparatus for controlling electronically controlled

A failure diagnostic processing system including a checking element for achieving a diagnostic check with respect to sensors to produce first and second diagnostic signals regarding each sensor. The first and second diagnostic signals indicate whether or not a failure condition stands, respectively. Also included are counting element for achieving a count up and a count down selectively in response to the first and second diagnostic signals, respectively; an alarm element for providing an alarm indication in accordance with the count number of the counting element; and a recording element for creating a history of failure by recording the count number of the counting element where the count number exceeds a predetermined reference number for starting the record.

Failure diagnostic processing system

A method of controlling the starting of a vehicle having an engine, an automatic clutch and an electronic control system which detects the extent of depression of an accelerator pedal and determines the speed of operation of a clutch actuator based on the detected extent of depression of the accelerator pedal. In particular, the method includes detecting a load on the engine due to a change in the condition in which the clutch is engaged, and stopping connection control of the clutch when the detected load on the engine is increased, to prevent an engine stop. In addition correction is made to vary the speed at which the vehicle starts linearly with respect to the extent of depression of the accelerator pedal.

Method of controlling the starting of a vehicle having automatic clutch

An automatic clutch control system including a clutch, a clutch actuator for controlling a clutch stroke, a plurality of solenoid valves for controlling the clutch actuator, a clutch stroke sensor for measuring the clutch stroke, a control unit for feeding back a stroke signal detected by the clutch stroke sensor and for controlling the solenoid valves to control clutch engagement and disengagement. The control unit includes a learning control section for storing a full clutch engagement point upon saturation of the stroke signal in a clutch engagement operation and storing clutch contact point upon start of rotation of an engine input shaft in a clutch engagement operation following a clutch disengagement operation. Based on the full clutch engagement point and clutch contact point, the control unit judges a clutch operation range for control of clutch engagement and disengagement.

An apparatus is provided for maintaining a braking force applied to a vehicle including an electromagnetic check valve disposed in a brake actuating fluid circuit, a set of sensors for sensing operating conditions of the vehicle, and an electronic control unit receiving, as inputs thereto, detection signals produced by the set of sensors for collectively controlling the detection signals to control operation of the electromagnetic check valve.

Growing community of inventors

Ayase, Japan

Toshihiro Hattori