Device and method of fail-safe control for electronically contro

Details Device and method of fail-safe control for electronically contro Device and method of fail-safe control for electronically contro

1988-12-09

1990-07-03

Orsino, Joseph A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340636, 340455, 3644241, G08B 2100

Patent

active

049395025

ABSTRACT:
A fail-safe control device for an electronically controlled automatic transmission to be mounted on a vehicle, the fail-safe control device: detects the battery voltage; previously stores a standard battery voltage; makes a comparison between the thus-detected battery voltage and the above-described standard battery voltage; and switches to an emergency mode of turning off all of shift solenoids when the voltage deviates from the standard upon the comparison. As a result of this, generation of defects that shifting from high speed gear stage to a lower speed gear stage due to defective operation of the shift solenoid and disconnection or the like due to the overvoltage of the solenoid can be prevented. Furthermore, if a failure is detected, it can be notified to a drive.

REFERENCES:
patent: 4012681 (1977-03-01), Finger et al.
patent: 4208929 (1980-06-01), Heino
patent: 4290109 (1981-09-01), Taniguchi et al.
patent: 4644334 (1987-02-01), Yato et al.
patent: 4839811 (1989-06-01), Kanagae et al.

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