×

Energization control apparatus for glow plug

  • US 4,939,347 A
  • Filed: 12/16/1988
  • Issued: 07/03/1990
  • Est. Priority Date: 12/17/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. An energization control apparatus for a glow plug, comprising:

  • a battery;

    a glow plug having a low rated voltage which allows rapid heating at a low battery voltage during cranking of a diesel engine in a severe wintertime condition;

    power control means, arranged between said battery and said glow plug, for controlling a power supplied to said glow plug; and

    energization control means for controlling said power control means so as to control a root-mean-square value of a voltage applied to said glow plug to be equal to the low rated voltage when a voltage applied to said glow plug at the start of the diesel engine is detected to be higher than the low battery voltage, wherein said energization control means controls a duty ratio for controlling an ON/OFF operation of said power control means, and said energization control means comprises;

    first and second timers started in association with a key switch operation, said first timer setting a rapid heating time at an initial period of energization;

    reference voltage setting means controlled in accordance with an output from said first timer;

    battery voltage detecting means; and

    duty ratio control means for controlling the duty ratio for controlling the ON/OFF operation of said power control means,said first timer counting a time shorter than that of said second timer,said second timer setting an after glow time, andsaid reference voltage setting means changing the reference voltage by an ON/OFF operation of said first timer.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×