Nissan Motor Company Limited

Aichi Machine Industry, Ltd.

Yoshihide Shinso

Shigeru Ishii

Tateki Jozaki

Shigeki Shimanaka

Hideharu Yamamoto

Shuji Kurokawa

Kosei Murata

Mitsuru Fujioka

Yuichi Asai

Takeki Jozaki

Makoto Shiomori

Described are apparatus and method for monitoring revolution speed values detected by corresponding revolution speed sensors too determine whether at least any one of an engine revolution speed sensor, a continuously variable transmission input axle revolution speed sensor, and a continuously variable transmission output axle revolution speed sensor has failed according to detected values of the engine revolution speed sensor, the input axle revolution speed sensor, and the output axle revolution speed sensor and a detected value of an instantaneous gear shift ratio when a lock-up mechanism is in a lock-up state. If all of three formulae on predetermined correlations are established, all of the sensors are determined to be normally operated. If any one or two of the three formulae are not established, the failure one of the three sensors is identified. The three correlation formulae are based as follows: 1) N.sub.E =N.sub.PRI ; 2) N.sub.PRI =N.sub.SEC .times.CN; and 3) N.sub.E =N.sub.PRI .times.C.sub.N, wherein N.sub.E denotes the engine revolution speed, N.sub.PRI denotes the input axle revolution speed, C.sub.N denotes the detected instantaneous gear shift ratio, and N.sub.SEC denotes the detected output axle revolution speed.

Apparatus and method for monitoring revolution speed value detected by

A vehicle diagnostic information storage system includes a volatile storage device such as a backup RAM and a nonvolatile storage device such as EEPROM. If a fault occurs, a control section stores data on fault items, and input and output conditions of sensors of a vehicle control system, in the volatile storage device and updates the data in the volatile storage device during a vehicle operation. In response to a switching operation of a vehicle main switch such as a turn-on operation of an ignition switch, the control section transfers the most recent version of updated data from the volatile storage device to the nonvolatile storage device.

Vehicle diagnostic data storing system

A method of controlling automatic transmissions during traction control for reducing engine output upon occurrence of a skid of a driving wheel comprises moving in a high throttle valve opening area a predetermined shift line on the low vehicular speed side, and moving the predetermined shift line on the high vehicular speed side in a low throttle valve opening area.

Method of controlling automatic transmissions during traction control

In a controller which controls a speed change ratio of a continuously variable transmission to a target speed change ratio set based on the driving conditions of an automobile, the driver manually inputs a command which increases or decreases the speed change ratio. The controller increases or decreases the target speed change ratio by a predetermined amount according to this command. Preferably, this increase/decrease pattern is varied according to the time for which the command continues. The driver of the automobile can thereby achieve a desired speed change ratio by a simple operation.

Continuously variable transmission controller

A sensor-failure decision system for determining a sensor failure of an automobile temperature sensor, comprises a first memory section adapted to receive input information indicative of a temperature of working fluid used in the automotive power train component part and detected by the automobile temperature sensor, a second memory section for storing a predetermined normal temperature region and a plurality of predetermined partitioned temperature regions which are obtained by partitioning a specified temperature region being lower than and continuous with the predetermined normal temperature region into a plurality of temperature regions, and a timer for measuring an elapsed time during which the temperature detected by the automobile temperature sensor is continually included in either one of the partitioned temperature regions. Also provided is a sensor-failure decision section for determining that a sensor failure of the automobile temperature sensor is present when the elapsed time measured by the timer reaches a predetermined time duration.

Decision system for determining sensor failure of temperature sensor in

An apparatus for checking a trouble in a communication circuit connected between engine and transmission control units. A check signal is produced at uniform intervals of time. The check signal is converted into a predetermined code. The converted code is transmitted through the communication circuit from one of the engine and transmission control units to the other control unit. The code transmitted to the other control unit is monitored to produce a failure signal to indicate that a trouble occurs in the communication circuit when the monitored code is not identical with the predetermined code.

Communication circuit trouble checking apparatus

A shift control apparatus for an automatic transmission provides a normal-temperature shift pattern and a high-temperature shift pattern. The high-temperature shift pattern is selected when a temperature of hydraulic oil for the transmission satisfies a predetermined condition. Once the high-temperature shift pattern has been selected, the apparatus inhibits the switching to the high-temperature shift pattern for a predetermined duration, thereby to avoid an excessively frequent hunting between the shift patterns.

Shift control apparatus for automatic transmission

A shift control apparatus for an automatic transmission provides a normal-temperature shift pattern and a high-temperature shift pattern. The high-temperature shift pattern is selected when a transmission fluid temperature satisfies a predetermined condition. The switching of the shift pattern is inhibited if the vehicle speed is lower than a predetermined speed, even when the temperature related to the transmission or engine has been judged to be higher than a predetermined temperature.

An apparatus is disclosed which prevents occurrence of an engine stalling in a power train of an automotive vehicle, including an engine and a lock-up type automatic transmission. The apparatus is operative during a braking operation of the vehicle and includes an engine controller to perform an idling speed control for the engine, and a transmission controller to perform a lock-up releasing control for releasing the torque converter from the lock-up mode. When the lock-up releasing control is being performed, the engine controller continuously performs the idling speed control and thereby prevents occurrence of engine stalling.

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Zama, Japan

Yoshihide Shinso