US 6,805,094 B2Granted

On-vehicle engine control apparatus

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsKohji Hashimoto, Katsuya Nakamoto

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Abstract

An on-vehicle engine control apparatus carries out engine drive control and throttle control using one single CPU and improves safety. The apparatus includes a load relay for feeding a power to a motor that controls throttle valve opening, a first IC (integrated circuit element) containing a CPU, and a second IC connected to the first IC via serial interfaces. The apparatus further includes a first mutual diagnostic device incorporated in the first IC and diagnoses operation of the second IC, a second mutual diagnostic device incorporated in the second IC to diagnoses operation of the first IC, and a detector for detecting an abnormality in operation of each system involved in throttle valve control. Operation of the load relay is controlled based on diagnostic results and abnormality detection results of the first and second mutual diagnostic devices.

Claims12

Dependent claims

An on-vehicle engine control apparatus including:

a motor for carrying out an intake throttle valve opening control conforming to an output of one of a pair of accelerator position sensors that detects a degree of working an accelerator pedal and an output of one of a pair of throttle position sensors that detects said throttle valve opening;
and an engine drive that includes at least one fuel injection solenoid valve;
said on-vehicle engine control apparatus comprising:
a load relay that feeds said motor with a power supply and returns said throttle valve opening to a predetermined position by interrupting said power supply;
a first integrated circuit element that includes a microprocessor and generates a first control output for controlling a throttle valve to said motor and a second control output to said engine drive;
a second integrated circuit element that is connected to said first integrated circuit element via a serial interface and generates a driving output to said load relay in cooperation with said microprocessor of said first integrated circuit element;
first mutual diagnostic means that is incorporated in said first integrated circuit element and diagnoses whether or not there is any abnormality in operation of said second integrated circuit element;
second mutual diagnostic means that is incorporated in said second integrated circuit element and diagnoses whether or not there is any abnormality in operation of said first integrated circuit element;
and
abnormality detection means that monitors operation of a sensor system, a control system, and an actuator system related to said throttle valve control at all times and generates an abnormality detection output at the time of occurring any abnormality;
wherein operation of said load relay is preferably controlled conforming to a diagnostic result of the operation of said second integrated circuit element carried out by said first mutual diagnostic means, a diagnostic result of the operation of said first integrated circuit element carried out by the mentioned second mutual diagnostic means, and the output of the mentioned abnormality detection means.

8 more elements

An on-vehicle engine control apparatus including:

a motor for carrying out an intake throttle valve opening control conforming to an output of one of a pair of accelerator position sensors that detects a degree of working an accelerator pedal and an output of one of a pair of throttle position sensors that detects said throttle valve opening;
a load relay that controls an electric power supply to said motor;
and a default position return mechanism that returns said throttle valve opening to a limp driving default position when said load relay interrupts the electric power supply;
in which said control apparatus is supplied with a power from an on-vehicle battery via a power supply switch and generates at least a first control output that carries out drive control of said motor, a second control output that controls a solenoid valve for injecting a fuel to an engine, and a third output that drives said load relay;
said on-vehicle engine control apparatus comprising:
minimum threshold value setting means for setting a minimum threshold value that operates when a normal throttle position sensor output is not received and sets a predetermined engine speed slightly higher than an idle engine speed that is a minimum engine speed necessary for maintaining stable rotation of the engine;
normal threshold value means for setting a normal threshold value that operates when a normal throttle position sensor output is received and calculates and sets an engine speed which is approximately in inverse proportion to the throttle valve opening detected by the throttle position sensor;
and
engine speed suppressing means for suppressing an engine speed that operates when said load relay is interrupted, and suppresses an engine speed by adjusting a fuel supply amount on the basis of said second control output, in response to a deviation between a predetermined engine speed set by said minimum threshold value setting means or by the normal threshold value setting means and an actual engine speed.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/292,603Filed 13 Nov 2002
Priority: JP P2002-15800430 May 2002
Published: US 2003/0221668 A14 Dec 2003
Granted: 19 Oct 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

F02D 41/266
Using computer, e.g. microprocessor: the computer being backed-up or assisted by another circuit, e.g. analogue
F02D 11/105
Of the electric type: characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal…
F02D 11/107
Of the electric type: safety-related aspects
F02D
Controlling combustion engines