Engine torque estimating device
AssigneeDenso Corporation
InventorYuji Konishi
Life of this patent
Estimating the term…
Abstract
A torque estimation error, which is an error between an estimated value and an actual value of the engine torque, is detected at first. Then, an error of a characteristic for engine frictional loss is learned based on the torque estimation error which is detected when ignition timing is around a most appropriate timing. An error of a characteristic for an ignition timing efficiency, which represents a relation between the ignition timing and an engine torque change, is further detected, based on the torque estimation error which is detected when ignition timing is delayed from the most appropriate timing. And the estimated value of the engine torque is corrected based on learning values for the errors of the engine frictional loss and the ignition timing efficiency.
Claims10
An engine torque estimating device for estimating an engine torque comprising:
- a first means for detecting a torque estimation error, which is an error between an estimated value and an actual value of the engine torque;
- a second means for learning an error of a characteristic for engine frictional loss, based on the torque estimation error which is detected when ignition timing is around a most appropriate timing;
- a third means for learning an error of a characteristic, which represents a relation between the ignition timing and an engine torque change, based on the torque estimation error which is detected when ignition timing is delayed from the most appropriate timing, wherein the error corresponds to an error of a characteristic for ignition timing efficiency;
- and
- a fourth means for correcting the estimated value of the engine torque based on learning values obtained in the third means.
A method for estimating an engine torque comprising:
- a first step for detecting a torque estimation error, which is an error between an estimated value and an actual value of the engine torque;
- a second step for learning an error of a characteristic for engine frictional loss, based on the torque estimation error which is detected when ignition timing is around a most appropriate timing;
- a third step for learning an error of a characteristic, which represents a relation between the ignition timing and an engine torque change, based on the torque estimation error which is detected when ignition timing is delayed from the most appropriate timing, wherein the error corresponds to an error of a characteristic for ignition timing efficiency;
- and
- a fourth step for correcting the estimated value of the engine torque based on learning values obtained in the third means.
A method for estimating an engine torque according to claim 7, wherein
- at the first step, a deviation of engine rotational speed between an actual engine rotational speed and a target idling rotational speed is detected during an idling operation of the engine, and
- the torque estimation error is calculated based on the deviation.
Dependencies are inferred from the claim text.