Abstract: In order to obtain an amount of fuel injection determined by a target fuel injection amount determining unit (51) from an injector (32) supplied with high-pressure fuel from a high-pressure pump (2), there is provided a reference injection period determining unit (52) responsive to a target fuel amount signal (Qt) for determining a reference injection period (Tr) and a correction amount calculating unit (53) responsive to the reference injection period (Tr) and the rotational speed (R) of a high-pressure pump (2) for calculating a correction amount (F) for correcting the error caused by decrease in fuel pressure during the period of fuel injection, whereby an actual injection period (Ta) is determined by correcting the reference injection period (Tr) by the correction value (F). As a result, the injection pulse width can be controlled so as to precisely supply the desired amount of fuel from the injector (32).

Abstract: A solenoid driving apparatus includes at least two solenoids of which driving periods do not overlap, a driving unit for driving each solenoid, and a signal generating unit for giving the driving unit a control signal information of each solenoid. The driving unit includes circuit sections jointly used with regard to the driving of each solenoid, and drives each solenoid based on the control signal information corresponding to each solenoid. The signal generating unit generates the control signal information of each solenoid which is given to the driving unit based on the drive pulse signal corresponding to each solenoid. Also, while a control signal information is given to the driving unit based on the drive pulse signal corresponding to one solenoid, the signal generating unit does not accept the input of any drive pulse signal even when a drive pulse corresponding to the other solenoid is generated by a noise.

Abstract: An apparatus for driving an electromagnetic load by applying a high voltage at the initial driving stage and thereafter applying a constant hold current is provided with a switch for supplying high-voltage energy to the electromagnetic load from a capacitor for storing high-voltage energy and a control circuit responsive to an electric signal for starting electromagnetic load driving and the output voltage of the capacitor. The control circuit turns the switch on at application of the electric signal and keeps it on until the output voltage reaches a prescribed level. The apparatus of this configuration enables optimum timing of changeover from high-voltage application mode operation to hold mold operation with simple circuitry.

Abstract: A high-pressure fuel injection system which has a fuel injection unit including an injector, a fuel pump for supplying a high-pressure fuel to the fuel injection unit, a motor for driving the fuel pump, a PID controller for controlling the operation of the motor, a device for measuring an actual fuel pressure in the fuel injection unit, a device for calculating a deviation of the actual fuel pressure from a predetermined desired fuel pressure and for inputting the deviation to the PID controller as an actuating signal, and a device for calculating a desired fuel injection quantity per injection from input signals indicating an engine speed, an accelerator opening, etc. A manipulated variable which is given as an output from the PID controller is supplied to the motor as an input to control the motor.

Abstract: An automatic transmission which includes a clutch (6); a clutch actuator (7) for detecting and controlling a position of the clutch; a transmission (1); a transmission actuator (2) for driving the transmission; a vehicle speed detector (22) for detecting a vehicle speed; a throttle opening detector (11) for detecting a throttle opening; an automatic shift unit (30) including a gear shift map (30a, 30b) having a gear shift characteristic which is determined based on the vehicle speed and the throttle opening; a computer unit (30c) for computing an instant gear position of the transmission based on the vehicle speed and the throttle opening according to the gear shift map; a gear position selector (30d) for controlling the transmission actuator based on the instant gear position to upshift or downshift the transmission; a shift prohibit unit (40) for determining whether the instant gear position matches the previous gear position from a memory (40a) for a predetermined times in a predetermined period and, if th

Abstract: A transmission control system with gear shift failure detection includes a transmission (1), each gear of which is equipped with a synchromesh mechanism (1e); an actuator unit (2) consisting of a shift actuator (2a) for making a gear shift in a shift direction and a select actuator (2b) for making a gear shift in a select direction; a control unit (4) for calculating a target position signal (M) from an amount of pressdown of an accelerator pedal, a vehicle speed, and a set position of a gear selector to control not only the actuator unit so that a gear is set within a target range but also a clutch so that connection or disconnection is made according to an operation of the transmission; a position detector (2f, 2g) provided in each of the shift and select actuators for detecting a position of a piston rod (2c, 2d); a servo cylinder (2a, 2b) in response to a signal from the position detector to position the piston rod at a given position of each gear; a speed detector (4a) in response to a signal from the po

Abstract: In a method for automatically controlling the gear-shifting operation of a vehicle gear transmission so as to shift the transmission to a calculated target position according to the vehicle operation parameter(s), the stability of the calculated target position is discriminated and the required gear-shifting operation is carried out only when the stability satisfies a prescribed condition, whereby unnecessary gear-shifting operations can be effectively eliminated even if for some reason the calculated target gear position frequently changes.

Abstract: In an automatic transmission system having a selector and a generator responsive to the operation of the selector for generating electric information indicating the operation condition of the selector, the nature of the malfunction or trouble arising in the generator is discriminated on the basis of the change in the electric information. This discrimination may be made as to whether or not there is a malfunction condition wherein no information is obtained for any set position, whether or not there is a malfunction condition wherein the information indicating a specific position is always produced. When there is a malfunction therein, the position set by the selector is assumed by taking into account the nature of the malfunction, making it possible to control the gear-shift operation even if there is malfunction.

Abstract: In a system for automatically controlling a gear transmission wherein an actuator device coupled with an operation member for the gear-shifting operation of the transmission is controlled for shifting the transmission to a target gear position, the system is provided with a first control unit for producing target signals indicating target gear positions and transmission data showing the relationships between specific gear positions of the gear transmission and positions of the operation member. A second control unit responsive to the target signal and the transmission data to produce a control signal for controlling the actuator device so as to position the operation member to a position corresponding to the target gear position.

Abstract: In a method for correcting clutch data used for controlling the engaging/disengaging operation of a friction type vehicle clutch, the meet position data among the clutch data is updated by a learning operation at each operation of a predetermined operation member of the vehicle, and the updated meet position data is corrected in accordance with the engine speed during the actual operation of the clutch, each time the vehicle is driven off, whereby appropriate correction of the clutch data can be carried out at suitable time intervals.

Abstract: A clutch control unit includes a clutch learning unit (4b) for determining a clutch connection characteristic (M) based on the clutch position at which the number of revolutions of an output shaft of the clutch reaches a predetermined value when the clutch is moved toward connection from a predetermined learning starting point and a clutch off detector (4c) for determining a clutch off point at which the number of revolutions of the output shaft is zero by moving the clutch toward disconnection and taking as a new learning starting point the clutch off point or a point made by adding a small offset value to the clutch off point, thereby controlling the clutch based on the clutch connection characteristic (M).

Abstract: An automatic transmission with an engine rpm sensor fault detector includes a starter switch (18); a clutch (6) for transmitting an output of an engine (8); a clutch control unit for controlling engagement of the clutch; a transmission (1); an engine rpm sensor (9); a an input shaft sensor (5a); a gear position sensor (40a) for detecting a gear position of the transmission; a control unit (4) for controlling the clutch control unit based on outputs of the respective detectors and enables the starter switch to operate when the transmission is in a neutral position. The control unit includes a starter switch detector (40b) for determining whether the starter switch is on and a fault determination unit (40c) for determining whether the first detector is faulty.

Abstract: A clutch control apparatus for controlling the operation of a friction type clutch comprises a data generator responsive to an engaging command signal for generating an electric signal corresponding to the time-course in a target clutch stroke pattern for engaging the clutch. The actual clutch stroke of the clutch is adjusted by the use of a clutch actuator coupled with the clutch in response to the electric signal in such a way that the actual clutch stroke is made to coincide with the target clutch stroke at each instant, whereby the actual clutch stroke varies in accordance with the desired time-course pattern for engaging the clutch after the application of the engaging command signal. The initial target clutch stroke of the desired pattern may be corrected in accordance with the amount of operation of an acceleration member to reduce the dead time in the torque transmission through the clutch.

Abstract: To optimize valuable processor time required for the execution of the main control program in an engine control system, execution of no more than two interruption programs in preparation for execution of a frequency calculating program is provided.

Abstract: A clutch control unit which includes a clutch (6); a first detector (9) for detecting a first rate of rotation of an input of the clutch; a second detector (5a) for detecting a second rate of rotation of an output of the clutch; a clutch learning unit (4b) for determining a clutch position at which both of the first and second rates of rotation meet predetermined conditions when said clutch is moved toward engagement from a preset learning starting point and storing a clutch characteristic; a signal generator (4c) for generating a learning underway signal indicating that the clutch learning unit is learning the clutch characteristic; and warning unit (16a) responsive to the learning underway signal to provide a warning display or sound.

Abstract: In an vehicle control apparatus having an automatic gear shift control system for a gear transmission and an automatic clutch control system for a clutch, the apparatus comprises a setting device for setting a desired feeling for vehicle drive-off, and characteristic curves for controlling the engagement of the clutch and the setting of the gear position in the gear transmission are determined simultaneously in response to the setting device.

Abstract: In an electronically controlled automatic transmission system including a gear transmission and a clutch, in which a target gear position is determined in accordance with map data for gear-shift control, it is discriminated whether or not the vehicle is in accelerating condition and necessary control for shifting up the transmission to the target gear position is carried out only when the vehicle is not in the accelerating state. Thus, when the driver presses hard on an accelerating member to accelerate the vehicle, a series operations for shifting up is not carried out, whereby the transmission is kept in its present gear position. The operation for shifting up can be carried out after the completion of the acceleration of the vehicle.

Abstract: A solenoid drive circuit, when providing a holding current to a solenoid by means of periodically turning a drive transistor on and off, by-passes a Zener diode until immediately before the end of a holding period as a result of an on state of a first switching transistor, and interrupts the by-pass of the Zener diode as a result of an off state of the first switching transistor during a time period immediately before the end of the holding period, as above-mentioned, until the lapse of a predetermined time after the end of the holding period. Thereby, current due to a counter-electromotive force is utilized in order to shorten the on time of the drive transistor to thereby save the supply of electric power. Moreover, by interrupting the by-pass of the Zener diode immediately before the end of the holding period, an off-responsibility of current flowing through the solenoid is not disturbed at the end of the holding period.

Abstract: A drive control apparatus of an automatic transmission device for use in automotive vehicles including a shift actuator and a select actuator comprising a pair of fluid pressure actuators capable of displacing a shift lever in right-angled two directions of a shift direction and a select direction, a piston rod and a detection rod capable of being displaced for an equal amount with respect to each other by a working fluid which is to be supplied and discharged to and from the actuators, a plurality of electromagnetic valves for supplying and discharging a working fluid to and from the actuators according to a control signal, a position switch for withdrawably engaging in a detection groove formed in an outer periphery of the detection rod and, when engaged, detaining the piston rod and detecting a control reference position of the actuators and outputting a detection signal thereof, a stroke sensor for continuously detecting displacement of the piston rod through the detection rod and an outputting a detectio

Abstract: An automatic transmission includes a fluid-pressure differential cylinder for select operation of the transmission and a fluid-pressure differential cylinder for shift operation of the transmission, each of the differential cylinders being built up into one block and joined with the mating differential cylinder with intake and discharge holes in one block held in communication with intake and discharge holes, respectively, in the other block. A piston rod of each of the differential cylinders has an annular groove and a cylinder block is provided with a locking member engageable with the groove to provide a reference position for the piston rod.