Aisin Aw Co., Ltd.

Shinichi Matsui

Kenji Suzuki

Masayuki Sugiura

Tatsuyuki Yoneda

Masahiro Kawaguchi

Yoshihiro Yamada

Takahiro Yamashita

Hiroshi Suzuki

Masayuki Tasaka

A control system for an automatic transmission, including a frictional engagement element, an adjusted oil pressure producing mechanism for adjusting an oil pressure supplied from an oil pressure source to produce an adjusted oil pressure, a hydraulic servo for applying/releasing the frictional engagement element on the basis of the adjusted oil pressure, an engine load detecting mechanism, a vehicle speed detecting mechanism, an up-shift deciding mechanism for determining whether an up-shift has been executed, and a pressure regulate signal generating mechanism for calculating the regulated target pressure of the adjusted oil pressure, when the up-shift is executed, to output a pressure regulate signal. The adjusted pressure signal producing mechanism corrects the regulated target pressure on the basis of the difference between the present vehicle speed and the vehicle speed at a shift point when the shift is executed under the present engine load.

Control system for automatic transmission

A short between terminals of a linear solenoid controlled by an electronic control in an automatic transmission is detected by sensing when a PWM duty ratio set by a feedback control operating the linear solenoid is less than a reference duty ratio. The reference duty cycle is calculated to be between a range of expected normal duty ratios in the absence of the short and a range of expected short duty ratios in the presence of the short.

Method of detecting linear solenoid inter-terminal short of electronic

A control system for use with an electronically-controlled automatic transmission provides for accurate determination of a full stop of a vehicle. The control system includes a device for computing the vehicle speed on the basis of a signal from a vehicle speed sensor, a device for determining whether or not the brake pedal is depressed, a device for computing deceleration from a first predetermined vehicle speed to a second predetermined, extremely low vehicle speed when the brake has been determined to be depressed, and a device for determining an estimated vehicle stop time starting with detection of the extremely low vehicle speed and ending with full stop of the vehicle, the estimated vehicle stop time corresponding to the above-computed deceleration.

Determination of full stop in an electronically-controlled automatic

A system for automate correction of characteristics of a throttle position sensor includes the throttle position sensor, a memory, a comparator and a correction device. The throttle position sensor detects a voltage corresponding to a throttle position. The memory stores first and second voltages which correspond to respective 0% and 100% throttle position set points. The comparator performs a comparison between the voltage detected by the throttle position sensor and both the first and second voltages stored in the memory. The correction device expands by a small value the range between both the first and second voltages stored in the memory when the throttle position voltage has been determined to be greater or smaller than both the first and second voltages, corrects the first and second voltages in the memory by using the upper and lower limit values of the thus expanded range as new first and second voltages for the 0% and 100% throttle position set points, and then stores the corrected first and second voltages in the memory. A throttle position signal is hence determined based on the corrected first and second voltages, which correspond to 0% and 100% throttle position set points, stored in the memory.

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Nagoya, Japan

Shinichi Matsui