Transmission auxiliary pump diagnosis method and apparatus

Details Transmission auxiliary pump diagnosis method and apparatus Transmission auxiliary pump diagnosis method and apparatus

2009-01-27

2011-11-08

Dickson, Paul N (Department: 3616)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

C180S065275, C417S063000, C702S183000

Reexamination Certificate

active

08055401

ABSTRACT:
A method includes diagnosing a transmission auxiliary pump in a hybrid electric vehicle (HEV) having an engine and an auxiliary power module (APM). A predetermined HEV operating mode is detected during which the engine is running, and the pump is cycled between on and off states. An electrical output value of the APM is determined during the on and off states. A control action is executed when the output value exceeds a corresponding threshold. An HEV includes an engine, a transmission, an APM, a battery connected to the APM, and a transmission auxiliary pump. An algorithm diagnoses operation of the pump. The APM includes an algorithm for diagnosing the pump during a predetermined mode during which the engine is running by determining an electrical output value of the APM during on and off states of the pump, and executes a control action when the output value exceeds a threshold.

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