Title:
ENGINE CONTROL METHOD AND DEVICE THEREOF
Document Type and Number:
Japanese Patent JPH01193067
Kind Code:
A
Abstract:
PURPOSE: To prevent malfunction so as to improve safety and reliability, in an engine control device equipped with a CPU, by stopping operation of a CPU backup device upon detecting a low voltage in a RAM backup device.
CONSTITUTION: A I/O2 is connected to a CPU 3, a ROM and a RAM5 via a data bus 12 and address bus 13. A CPU backup device 10 observes a CPU reset signal 8a and detects an abnormality of the CPU. With a constant voltage source 15a below a predetermined voltage through a RAM backup circuit 9, a NMI signal 9a is input into the CPU3 and significant data are evacuated in the RAM 5.
Inventors:
SASAKI SHOJI
Application Number:
JP1470788A
Publication Date:
August 03, 1989
Filing Date:
January 27, 1988
Export Citation:
Assignee:
HITACHI LTD
HITACHI AUTOMOTIVE ENG
HITACHI AUTOMOTIVE ENG
International Classes:
F02D45/00; G05B9/02; (IPC1-7): F02D45/00; G05B9/02
Attorney, Agent or Firm:
Masami Akimoto
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