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Electronic control unit for vehicle having operation monitoring function and fail-safe function

  • US 20030060964A1
  • Filed: 09/13/2002
  • Published: 03/27/2003
  • Est. Priority Date: 09/27/2001
  • Status: Active Grant
First Claim
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1. An electronic control unit for a vehicle comprising:

  • a CPU having a predetermined fail-safe function required after occurrence of a fault in addition to a vehicle operation control;

    a monitor circuit for receiving as an input from the CPU a watchdog pulse generated in a predetermined cycle and outputting a reset signal to the CPU when periodicity of the watchdog pulse is disrupted; and

    a memory for storing reset information indicating a record thereof when the reset signal is outputted from the monitor circuit, wherein the CPU executes the predetermined fail-safe process based on the reset information stored in the memory after the CPU is once reset and thereafter re-started.

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