INTERNAL COMBUSTION ENGINE CONTROL APPARATUS

• US 20090020100A1
• Filed: 06/24/2008
• Published: 01/22/2009
• Est. Priority Date: 07/18/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: SAKAIGAKI, Keiichiro, Ohno, Takao, Furuta, Akira
• Granted Patent: US 7,726,278 B2
• Time in Patent Office: Days
• US Class Current: 123/350
• CPC Class Codes: F02D 2041/0095 Synchronisation of the cylinders during engine shutdown
• CPC Class Codes: F02D 2250/06 Reverse rotation of engine
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02N 11/0825 related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
• CPC Class Codes: F02N 11/10 Safety devices F02N11/08 takes precedence
• CPC Class Codes: F02N 2250/04 Reverse rotation of the engine
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In order to accurately detect an abnormal state of a rotation direction detection unit for detecting a rotation direction of a crank shaft, provided is an internal combustion engine control apparatus including: a rotation detection unit including the rotation direction detection unit for detecting the rotation direction of the crank shaft of an engine to output a rotation direction signal, and a rotation speed detection unit for outputting a pulse signal according to a rotation speed of the crank shaft; a stop position calculation unit for calculating, based on an output from the rotation detection unit, a stop position of the crank shaft when the engine stops; and an abnormal state detection unit for detecting the abnormal state of the rotation direction detection unit when an actual rotation direction of the crank shaft differs from the rotation direction of the crank shaft based on the rotation direction signal.

Claims

1. An internal combustion engine control apparatus comprising:

rotation detection means including a rotation direction detection unit for detecting a rotation direction of a crank shaft of an internal combustion engine to output one of a forward rotation signal and a reverse rotation signal as a rotation direction signal, and a rotation speed detection unit for outputting a pulse signal according to a rotation speed of the crank shaft;

stop position calculation means for calculating, based on an output from the rotation detection means, a stop position of the crank shaft when the internal combustion engine stops; and

abnormal state detection means for detecting an abnormal state of the rotation direction detection means,

wherein the abnormal state detection means detects the abnormal state of the rotation direction detection unit when an actual rotation direction of the crank shaft differs from the rotation direction of the crank shaft based on the rotation direction signal.

2. An internal combustion engine control apparatus according to claim 1, wherein the abnormal state detection means detects the abnormal state when the reverse rotation signal is output from the rotation direction detection unit in the case where the crank shaft rotates in a forward direction at a speed equal to or higher than a predetermined rotation speed.

3. An internal combustion engine control apparatus according to claim 1, wherein the abnormal state detection means detects the abnormal state when the reverse rotation signal is output from the rotation direction detection unit in the case where the crank shaft is rotated in the forward direction by a starter motor for starting the internal combustion engine.

4. An internal combustion engine control apparatus according to claim 1, wherein the abnormal state detection means detects the abnormal state when the forward rotation signal is output from the rotation direction detection unit in the case where the crank shaft is rotated in a reverse direction by a motor generator for rotating the crank shaft.

5. An internal combustion engine control apparatus according to claim 1, further comprising:

operating state detection means for detecting an operating state of a vehicle including the internal combustion engine; and

idling stop control means for executing idling stop control according to the operating state,

wherein the idling stop control means stops the idling stop control when the abnormal state detection means detects the abnormal state.

6. An internal combustion engine control apparatus according to claim 1, further comprising:

operating state detection means for detecting an operating state of a vehicle including the internal combustion engine; and

idling stop control means for executing idling stop control according to the operating state,

wherein the idling stop control means uses a starter motor for starting the internal combustion engine to restart the internal combustion engine when the abnormal state detection means detects the abnormal state.