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Automatic stop/restart device of vehicle engine

  • US 6,404,072 B2
  • Filed: 02/15/2001
  • Issued: 06/11/2002
  • Est. Priority Date: 02/15/2000
  • Status: Expired due to Term
First Claim
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1. An automatic stop/restart device for an engine of a vehicle, the vehicle having a drive wheel, an accelerator pedal, a brake pedal, a battery, and a motive force transmission mechanism which transmits a creep force to the drive wheel according to a rotation of the engine, comprising,a motor which starts the engine, a sensor which detects if the transmission mechanism is in a drive range wherein the creep force is transmitted to the drive wheel, a sensor which detects that the brake pedal is depressed, a sensor which detects that the accelerator pedal is depressed, a sensor which detects a state of charge (SOC) of the battery, a sensor which detects a depression amount of the brake pedal, and a microprocessor programmed to:

  • stop the rotation of the engine when the brake pedal is depressed and the vehicle is stationary, determine if the vehicle is in an idling stop state wherein the brake pedal is depressed, the vehicle is stationary with the engine stopped, and the transmission mechanism is in the drive range, restart the engine by the motor when the accelerator pedal is depressed or the battery SOC has fallen below a predetermined SOC in the idling stop state, and restart the engine by the motor when the brake pedal depression amount has decreased by a predetermined amount in the idling stop state.

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