Engine control system
AssigneeHonda Motor Co., Ltd.
InventorsTomoki Fukushima, Yoshinori Maekawa, Hayato Matsuda
Life of this patent
Estimating the term…
Abstract
In an engine control system mounted on a machine such as a walk-behind truck through a CVT and having an actuator whose operation is controlled such that a detected engine speed becomes equal to a desired engine speed, the output of the engine is estimated based on the detected engine speed and a detected throttle opening, the desired engine speed is changed when the estimated engine output is greater or smaller than output threshold values, and a speed reduction ratio of the CVT is also changed based on the detected engine speed such that a detected speed of the CVT output shaft speed becomes equal to a desired output shaft speed, thereby enabling to reduce the fuel consumption and noise of the engine.
Claims22
A system for controlling operation of an internal combustion engine connected to a machine through a variable speed reducer that reduces a speed of the engine to drive the machine, comprising:
- an actuator moving a throttle valve installed in an intake pipe of the engine;
- a crank angle sensor detecting the speed of the engine;
- an engine speed controller controlling operation of the actuator such that the detected engine speed becomes equal to a desired engine speed;
- a speed sensor detecting a speed of an output shaft of the variable speed reducer;
- a throttle position sensor detecting an opening of the throttle valve;
- an engine output estimator estimating an output of the engine based on the detected engine speed and the detected throttle opening;
- a desired engine speed changer changing the desired engine speed to a value in a speed-increasing direction when the estimated engine output is determined to be greater than a rising output threshold value;
- and
- a speed reduction ratio changer changing a speed reduction ratio of the variable speed reducer based on the detected engine speed such that the detected output shaft speed becomes equal to a desired output shaft speed.
A method of controlling operation of an internal combustion engine connected to a machine through a variable speed reducer that reduces a speed of the engine to drive the machine and having an actuator moving a throttle valve installed in an intake pipe of the engine;
- comprising the steps of:
- detecting the speed of the engine;
- controlling operation of the actuator such that the detected engine speed becomes equal to a desired engine speed;
- detecting a speed of an output shaft of the variable speed reducer;
- detecting an opening of the throttle valve;
- estimating an output of the engine based on the detected engine speed and the detected throttle opening;
- changing the desired engine speed to a value in a speed-increasing direction when the estimated engine output is determined to be greater than a rising output threshold value;
- and
- changing a speed reduction ratio of the variable speed reducer based on the detected engine speed such that the detected output shaft speed becomes equal to a desired output shaft speed.
Dependencies are inferred from the claim text.