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Method for controlling an automatic transmission including predetermined time delay in shifting

  • US 4,730,519 A
  • Filed: 01/02/1987
  • Issued: 03/15/1988
  • Est. Priority Date: 01/13/1986
  • Status: Expired due to Term
First Claim
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1. In a method for controlling an automatic transmission comprisinga plurality of frictional engaging elements arranged in frictional engagement for changing the state of transmission of engine power,a plurality of hydraulic servo mechanisms cooperated with the corresponding frictional engaging elements for independently engaging or releasing the frictional engaging elements, andelectronic control means for delivering control signals to the hydraulic servo mechanisms,said method comprising the step of independently engaging or releasing selected ones of said frictional engaging elements to change the power transmission state,the improvement wherein the delivery of a signal from the electronic control means to the hydraulic servo mechanism to operate one selected frictional engaging element is delayed a predetermined time from the delivery of a signal from the electronic control means to the hydraulic servo mechanism to operate another selected frictional engaging element, the other frictional engaging element taking a present state after having passed an antecedent state and being operated from the present to a subsequent state, andthe predetermined delay time being varied depending on the antecedent state of the other frictional engaging element preceding its operation.

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