Nissan Motor Company Limited

Hitoshi Takeda

Sadao Takase

Hidetaka Suzuki

Tadashi Suzuki

Norimasa Kishi

Hiroyuki Nomura

Kiyoshi Yamaki

Masanori Mizote

Teruo Kawasaki

Kazuyuki Mori

Hideyuki Nagashima

Ken Kamijo

Minoru Tomikashi

Tooru Futami

Osamu Isobe

A control system for an automatic transmission is disclosed. The control system features detecting output shaft torque, evaluating a pattern of variation detected of the output shaft torque during shifting, scheduling a variation of fluid pressure to be supplied to a friction element in response to the result of evaluation, and regulating a fluid pressure supplied to the friction element in response to the variation of fluid pressure scheduled.

Control system for automatic transmission producing shock-free shift

A method of and an apparatus for alleviating shocks occurring during a gear shift of an automatic transmission are disclosed. In order to alleviate shift shocks, the output torque of the engine is reduced upon the lapse of a delay time from the occurrence of a shift command and before the interruption of lock-up action of the torque converter. This delay time is updated using a factor determined by substracting a predetermined constant from a length of time from the occurrence of the shift command to an instant when an actual engine revolution speed agrees with a value of an estimated engine revolution speed variation during the interruption of lock-up action. The engine revolution variation is estimated based on an actual engine revolution speed variation trend taking place immediately after the occurrence of the shift command but before the interruption of lock-up action. The delay time updated in this manner is used during a gear shifting operation initiated by a subsequent shift command.

Method of and apparatus for alleviating shift shocks of automatic

A lock-up control system for a lock-up type automatic transmission is disclosed where the transmission output torque is monitored and the interruption of the lock-up action is executed after the transmission output torque has satisfied a predetermined condition after generation of a command for shifting within the transmission.

Lock-up control for shockless gear shifting

In order to alleviate shocks occurring when an automatic transmission driven by an engine shifts between reduction ratios, the engine is caused to change its output torque by an amount indicated by a target torque variation. The target torque variation is set in response to an estimated engine revolution speed variation before and after the shifting operation.

Method and apparatus for alleviating transmission shift shocks

In a multiple computer system in which a plurality of computer stations are connected for mutual data transfer via a common data bus, at least one computer station is provided with a fail safe facility which prevents disruption of the entire system due to malfunction of the computer station. The computer is preprogrammed to perform an input/output circuit diagnosis routine after power-up and before control program execution which causes the input/output circuit to output a coded pulse train signal. An abnormality detection circuit receives the coded pulse signal, converts it to a parallel-bit word, and compares the derived word to a stored, predetermined word. If the words match, the detection circuit causes a switching circuit to connect the computer to the common data bus; otherwise, the computer remains disconnected from the rest of the multiple computer system.

CPU self-test system including the capability of disconnecting a faulty

A loop-type data transmission/reception network system has a plurality of data processing stations and a single data transmission/reception route which interconnects said stations in a loop for transmitting necessary data between the stations, each of the stations comprising: (a) means for detecting a break-down in the data transmission/reception route between the station itself and the preceding station; (b) means responsive to the detection of a break-down in the data transmission/reception route between the station itself and the preceding station by the detection means for transmitting break-down information to the subsequent station; and means for reversing the transmission direction in the data transmission reception route in accordance with the break-down information transmitted by the break-down information transmitting means.

Loop-type data transmission/reception network

A lock-up control wherein a temporary release timing of a bridge clutch is adjusted by learning control. According to the learning control, a difference between an estimated engine revolution speed after an instant when the bridge clutch is temporarily released and an actual engine revolution speed is obtained, an integral value is obtained by integrating the difference, and the temporary release timing is adjusted or corrected in such a manner as to decrease a difference between the integral value and a predetermined value.

Lock-up control and method thereof

An automatic seat positioning device for a vehicle driver's seat wherein a reversible motor is engaged with one of electromagnetic clutches and rotates so that an associated seat member actuating mechanism moves one of the seat members to a desired position for a specific driver from an initial position upto a maximum movable end. In such an automatic seat positioning device of the construction described above, a seat position detector corresponding to the seat member for detecting that the seat member arrives at a specific position at which the detector is located and a preset control circuit for presetting a counter, which indicates the set position of the seat member by counting the number of rotations of the motor, to a value corresponding to the number of rotations of the motor by which the seat member is moved from an initial starting position to the specific position are provided so that an indication error of the counter can be canceled due to slips which occur whenever the motor is repetitively started and stopped, engaged with the electromagnetic clutch. In addition, the automatic seat positioning device stores the positional data of the seat member set at the desired position from the counted value of the counter in a memory provided therewithin in order to return the current set position of the seat member to an originally set position on a basis of the stored data. In this case, a memory correction circuit is provided which corrects an erroneous stored data to an accurate value corresponding to the actual position in response to the presetting of the counter according to the number of times by which a manual switch which energizes the motor in a normal or reverse direction is operated. Therefore, the seat member can more accurately be returned to the originally set position.

Automatic seat positioning device for a vehicle driver seat

A navigation instrument comprises a first counter for counting travelling distance from a start point, a second counter for counting travelling time from starting, a means for setting a scheduled average vehicle speed, an arithmetic means for calculating average vehicle speed, the deviation of travelling distance from the scheduled distance and the deviation of travelling time from the scheduled time, and a display means for displaying the result of calculation. The first counter is capable of subtractively counting travelling distance in response to switching operation of a switching means which is incorporated to the first counter. The first counter is also incorporated with a means for stopping navigating operation which is operative when the first counter counts down the travelling distance until a given value.

Navigation instrument

A navigation instrument for use with a roadway vehicle comprises an arithmetic means producing three data signals showing the average speed of the vehicle, the deviation of the travelling distance from a scheduled one, and the deviation of the travelling time from a scheduled one, and a display means for displaying the three data sequentially fed from the arithmetic means through a signal selector means. The arithmetic means includes travelling distance/time deviation accumulating means for adding the deviation of the travelling distance/time with respect to the average speed initially set to the deviations of the travelling distance/time whenever the average speed is altered. Thus, the navigation instrument of the present invention makes it possible to calculate and display the travelling distance/time deviation accumulated value when the average speed of the vehicle is altered on the way of vehicle travelling.

Growing community of inventors

Yokohama, Japan

Hitoshi Takeda