Title:
ENGINE CONTROL DEVICE
Document Type and Number:
Japanese Patent JP3205146
Kind Code:
B2
Abstract:
PURPOSE: To facilitate trouble shooting by connecting a memory rewriter, external equipment, to the communication circuit of a CPU, and rewriting the contents of a non-volatile memory with data erasable and writable in the CPU, by the memory rewriter.
CONSTITUTION: In a control device 1, a detection signal from an operating state detecting sensor in an engine 2 is waveform-processed by an input processing circuit 4, the optimum operating state is computed by a CPU 3, and a computed control signal is outputted to the engine 2 by an output circuit 5. In the CPU 3, an MPU 7 is put in action according to the control program of an ROM 8, and the computed result is stored in an RAM 9. A memory rewriter 11, external equipment, is connected to the communication circuit 10 of the CPU 3. On the other hand, the action of the CPU 3 is monitored by a watch dog circuit 12, and in the case of abnormality being generated to the CPU 3, the CPU 3 is reset. The contents of the ROM 8 is thereby rewritten by the memory rewriter 11 so as to facilitate trouble shooting.
Inventors:
Masahiro Sasaki
Shoji Sasaki
Hideaki Ishikawa
Shoji Sasaki
Hideaki Ishikawa
Application Number:
JP26455993A
Publication Date:
September 04, 2001
Filing Date:
October 22, 1993
Export Citation:
Assignee:
株式会社日立製作所
株式会社日立カーエンジニアリング
株式会社日立カーエンジニアリング
International Classes:
F02D45/00; (IPC1-7): F02D45/00
Domestic Patent References:
| JP299746A | ||||
| JP5189981A | ||||
| JP6378253A | ||||
| JP4326148A | ||||
| JP5233267A | ||||
| JP63286992A |
Attorney, Agent or Firm:
Yasuo Sakuta