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Electronic control system for powershift transmission with compensation for variation in supply voltage

  • US 5,053,960 A
  • Filed: 08/27/1990
  • Issued: 10/01/1991
  • Est. Priority Date: 05/29/1987
  • Status: Expired due to Term
First Claim
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1. An improved electronic control system for use with a powershift transmission having a plurality of hydraulically-actuated clutches and at least one solenoid-operated hydraulic valve means for adjusting at least one parameter within the transmission, such valve means including a solenoid coil to which a first electrical signal is applied, the electronic control system being of the type which includes electronic switching means connectable in series with the coil to form a series combination to which a D.C. supply voltage is applied across, the electronic control system including microprocessor means for operating the powershift transmission in accordance with operating parameters stored in the microprocessor means for:

  • determining the actual value of the supply voltage provided across the series combination of the solenoid coil and the electronic switching means;

    determining the difference between the actual value of the supply voltage and a predetermined nominal voltage value of the supply voltage; and

    adjusting the second signal in inverse proportion to the value of the difference, thereby compensating for variation in the supply voltage.

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