Apparatus and method for determining a failure of a temperature

Details Apparatus and method for determining a failure of a temperature Apparatus and method for determining a failure of a temperature

1991-02-14

1992-04-21

Shoap, Allan N.

Communications: electrical

Land vehicle alarms or indicators

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

340587, 731181, 36442403, B60Q 1100, G01M 1900

Patent

active

051072467

ABSTRACT:
An apparatus and a method for determining a failure of a temperature sensor for an automatic transmission of a motor vehicle are provided. A first temperature sensor senses the temperature of a coolant for cooling an engine. A second temperature sensor senses the temperature of a hydraulic oil in the transmission. The output of the second temperature sensor is compared with a first failure determination level and a second failure determination level. It is determined that the second temperature sensor is in a failure when the output of the second temperature sensor is lower than the first failure determination level or higher than the second failure determination level. The output of the first temperature sensor is compared with a first predetermined level and a second predetermined level which is higher than the first predetermined level. The determination of a failure of the second temperature sensor is prohibited when the output of the first temperature sensor is below the first predetermined level or above the second predetermined level.

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