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Device and method of fail-safe control for electronically controlled automatic transmission

  • US 4,939,502 A
  • Filed: 12/09/1988
  • Issued: 07/03/1990
  • Est. Priority Date: 12/28/1987
  • Status: Expired due to Term
First Claim
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1. A fail-safe control device for an electrically controlled automatic transmission including a plurality of shift solenoids comprising:

  • (a) means for detecting a battery voltage;

    (b) means for storing a standard battery voltage range;

    (c) means for comparing said detected battery voltage and said stored standard battery voltage range to each other;

    (d) means for determining when said detected battery voltage is outside of said stored standard battery voltage range for a duration of time greater than a predetermined duration of time; and

    (e) means for switching to an emergency mode control by turning off all of the shift solenoids when said detected battery voltage is determined to be outside of said stored standard battery voltage range more than said predetermined duration of time.

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