Electronic control type automatic speed changer

Details Electronic control type automatic speed changer Electronic control type automatic speed changer

1990-12-28

1994-08-09

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

25112908, F16H 5924

Patent

active

053355652

ABSTRACT:
In an electronic control type automatic speed changer equipped with a linear solenoid for controlling the oil pressure of the automatic speed changer, when potential difference is generated between the power ground (PE) and the signal ground (SE), the line pressure of the automatic speed changer does not coincide with the predetermined set value due to erroneous signals generated. In order to compensate for the potential difference between PE and SE, according to the present invention, a PE -SE potential difference compensator is provided in series between a current monitor device and PE, and a solenoid monitor circuit is provided for monitoring the potential of the connection point of the current monitor device and the PE-SE potential difference compensator. Thus even if there is a potential difference between PE and SE, a potential difference proportional to the current actually flowing in the linear solenoid can be detected. Thus, the current set for the solenoid current can be accurately made to coincide with the actual solenoid current, and the accuracy of control of the oil pressure of the automatic speed changer can be enhanced.

REFERENCES:
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patent: 3517680 (1970-06-01), Richardson et al.
patent: 3938409 (1976-02-01), Uozumi
patent: 4017056 (1977-04-01), Schwalenstocker et al.
patent: 4355296 (1982-10-01), Drone
patent: 4373697 (1983-02-01), Phelps
patent: 4466521 (1984-08-01), Hattori et al.
patent: 4546437 (1985-10-01), Bleckmann et al.
patent: 4638689 (1987-01-01), Sakai
patent: 4875448 (1989-10-01), Dykstra

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