ROAD SURFACE SLOPE DETERMINATION METHOD AND CONTROL DEVICE FOR ON-VEHICLE INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a road surface slope determination method improving the determination accuracy of a road surface slope using brake master pressure which is a value reflecting a brake stepping amount by a driver and deceleration of wheel speed, and a control device for an on-vehicle internal combustion engine which controls the operation of the internal combustion engine using the road surface slope determination method. SOLUTION: The slope of a running road surface is determined using the brake master pressure as a pressurizing degree of brake fluid, and the deceleration calculated based on a degree of change in the wheel speed of a vehicle decelerated by stepping of a brake pedal. Whether the running road surface is flat or sloped is determined using a brake master pressure detected after "500 ms" from a detection of change in the brake master pressure as the brake master pressure, and using deceleration calculated from the wheel speed detected when the brake master pressure is detected after "500 ms" as the deceleration, and the wheel speed detected further after "500 ms" from the detection of the wheel speed. COPYRIGHT: (C)2011,JPO&INPIT