摘要:
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 position detector of the shift actuator to detect an operational speed of the piston rod of the shift actuator; and a decision maker (4b) in response to a signal from the speed detector to decide that a gear shift is faulted if the operation speed is lower than a reference speed for a predetermined time outside a synchromesh mechanism operational range of the transmission.
摘要:
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. The fault determination unit controls the clutch control unit to engage the clutch temporarily if there is no output from the first detector with the starter switch on and determines that the first detector is faulty if there is an output from the second detector.
摘要:
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.
摘要:
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 they do not match for the predetermined times, invalidating the instant gear position and prohibiting any shift operation according to the gear shift map; and a shift determination unit (41) for establishing an upshift prohibit condition when the throttle opening is equal to or less than a predetermined value while releasing the upshift prohibit condition when the vehicle speed is low or the clutch is in a position toward disengagement from a half clutch position, or with a low-speed gears even if the throttle opening is equal to or less than the predetermined value.
摘要:
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.
摘要:
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.
摘要:
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 detection signal thereof, and a control unit for calculating the best position for each said actuators according to an input information regarding the driving state of the automotive vehicle and the operating state of an engine thereof and outputting a processed signal thereof to the electromagnetic valve in order to control the electromagnetic valve and also feedback controlling the activation of the electromagnetic valve according to the detection signals received from the position switch and from the stroke sensor, the activation of the actuators being normally controlled according to the input signal from the stroke sensor but, when the stroke sensor is out of order, being controlled according to the input signal coming from the position switch.
摘要:
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.
摘要:
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.
摘要:
A semiconductor integrated circuit includes a ring oscillator and a noise canceller. The ring oscillator includes first and second signal generators. The first signal generator is configured to generate a first output signal having a first phase based on an input signal. The second signal generator is configured to generate a second output signal having a second phase different from the first phase based on the input signal. The noise canceller includes first and second amplifiers and an arithmetic module. The first amplifier is configured to amplify the first output signal generated by the first signal generator using a first amplification factor. The second amplifier is configured to amplify the second output signal generated by the second signal generator using a second amplification factor. The arithmetic module is configured to combine the first output signal amplified by the first amplifier with the second output signal amplified by the second amplifier.