A control apparatus for an engine increases an intake air quantity just before engine stop to increase a compression pressure in a compression stroke. As the compression pressure is increased, a negative torque in the compression stroke increases and obstructs engine rotation, and brakes the engine
A control apparatus for an engine increases an intake air quantity just before engine stop to increase a compression pressure in a compression stroke. As the compression pressure is increased, a negative torque in the compression stroke increases and obstructs engine rotation, and brakes the engine rotation. Thus, a range of crank angle, in which torque is below engine friction, that is, in which engine rotation can be stopped, is reduced. As a result, variation in engine rotation stop position is reduced to be within a small range of crank angle. Information of engine rotation stop position is stored, and the stored information of engine rotation stop position is used at the start of an engine to accurately determine an initial injection cylinder and an initial ignition cylinder to start the engine.
대표청구항▼
What is claimed is: 1. An engine rotation stop position control apparatus comprising: engine stop means for stopping at least one of ignition and fuel injection on the basis of an engine stop command to stop engine rotation; first parameter calculation means for calculating a parameter representati
What is claimed is: 1. An engine rotation stop position control apparatus comprising: engine stop means for stopping at least one of ignition and fuel injection on the basis of an engine stop command to stop engine rotation; first parameter calculation means for calculating a parameter representative of engine operations, second parameter calculation means for calculating a parameter which obstructs engine operations; and rotation stop position estimation means for estimating an engine rotation stop position in the course, in which the engine stop means stops engine rotation, on the basis of the parameter representative of engine operations and the parameter for obstructing the engine operations, which are calculated by the first parameter calculation means and the second parameter calculation means. 2. The engine rotation stop position control apparatus according to claim 1, wherein the engine stop command is generated by either of an ignition switch OFF signal and an idling stop ON signal. 3. The engine rotation stop position control apparatus according to claim 1, wherein the first parameter calculation means calculates at least one of kinetic energy of an engine, rotational speed, crankshaft angular velocity, and piston traveling speed, as the parameter representative of motions. 4. The engine rotation stop position control apparatus according to claim 1, wherein the first parameter calculation means calculates the parameter representative of motions every crank angle part obtained by dividing 720째 CA by the number of cylinders of the engine. 5. The engine rotation stop position control apparatus according to claim 1, wherein the first parameter calculation means calculates an instantaneous value at a timing of calculation. 6. The engine rotation stop position control apparatus according to claim 1, wherein the second parameter calculation means calculates at least one of pumping loss, friction loss in respective parts, and driving loss in respective auxiliary devices, as the parameter for obstructing motions. 7. The engine rotation stop position control apparatus according to claim 6, wherein the second parameter calculation means calculates the parameter for obstructing motions, taking into account at least one of mass of and a diameter of rotational motions of portions related to engine operations and moment of inertia of an engine. 8. The engine rotation stop position control apparatus according to claim 6, wherein the second parameter calculation means calculates the parameter for obstructing motions, at least once in the course, in which the engine stops rotation. 9. The engine rotation stop position control apparatus according to claim 1, wherein the second parameter calculation means calculates a quantity, by which engine operations are obstructed, on the basis of that parameter representative of motions, which is calculated this time by the first parameter calculation means, and the parameter representative of motions, which is calculated at the last time. 10. The engine rotation stop position control apparatus according to claim 1, wherein the second parameter calculation means calculates a quantity, by which engine operations are obstructed, in a crank angle obtained by dividing 720째 CA by the number of cylinders of the engine. 11. The engine rotation stop position control apparatus according to claim 1, wherein the rotation stop position estimation means estimates a parameter representative of future motions on the basis of that parameter representative of motions, which is calculated this time by the first parameter calculation means, and the parameter for obstructing motions, and estimates an engine rotation stop position on the basis of a predicted value of the parameter representative of future motions. 12. The engine rotation stop position control apparatus according to claim 11, wherein the rotation stop position estimation means estimates a parameter representative of motions in the future by that part of a crank angle, which is obtained by dividing 720째 CA by the number of cylinders of the engine. 13. The engine rotation stop position control apparatus according to claim 11, wherein the rotation stop position estimation means estimates a parameter representative of further future motions on the basis of a predicted value of the parameter representative of future motions and the parameter for obstructing motions. 14. The engine rotation stop position control apparatus according to claim 11, wherein the rotation stop position estimation means estimates that engine rotation is stopped this side of a crank angle of the predicted value when a predicted value of the parameter representative of future motions falls below a predetermined value. 15. The engine rotation stop position control apparatus according to claim 1, wherein the rotation stop position estimation means calculates an engine stop determination value on the basis of that parameter for obstructing motions, which is calculated by the second parameter calculation means, and makes a comparison between that parameter representative of motions, which is calculated by the first parameter calculation means, in the course, in which the engine stop means stops engine rotation, to estimate an engine rotation stop position.
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