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

1988-12-07

1991-05-14

Gruber, Felix D.

Boots, shoes, and leggings

74866, 74867, B60K 4108, G05D 1702

Patent

active

050161741

ABSTRACT:
A fail-safe control device for an electronically controlled automatic transmission mounted on a vehicle is provided with a sensor for sensing the number of revolutions input to the transmission and a sensor for sensing the number of revolutions output from the transmission or from a car speed sensor. The actual gear ratio of the transmission is calculated in accordance with the number of revolutions input to the transmission and the number of revolutions output from the transmission or from the car speed sensor each obtained from said sensors. The time taken for changing the actual gear ratio at the time of shift initiation to the fixed gear ratio after the shift is measured. A predetermined shift time which has been stored is compared with the thus-measured time for the purpose of detecting a failure of the transmission. As a result of this, a driver can take a measure such as performing an emergency control or the like, and furthermore, the failure can be displayed by a failure alarm device so that the driver can arrange for repair.

REFERENCES:
patent: 4208929 (1980-06-01), Heino
patent: 4283970 (1981-08-01), Vukovich
patent: 4785689 (1988-11-01), Iwatsuki et al.
patent: 4843550 (1989-06-01), Kawanabe et al.
patent: 4846021 (1989-07-01), Hamano et al.
patent: 4849899 (1989-07-01), Cote et al.
patent: 4870581 (1989-09-01), Ito et al.

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