JPWO2022176254A5

JPWO2022176254A5 -

Info

Publication number: JPWO2022176254A5
Application number: JP2023500518A
Authority: JP
Filing date: 2021-09-24
Publication date: 2023-08-03

Claims

An electric valve timing control device that controls an electric valve timing device that changes valve timing by changing a relative rotation phase of a camshaft with respect to a crankshaft of an internal combustion engine by a motor connected to the camshaft,
When the relative rotation phase of the camshaft is changed by the electric valve timing device after the stop processing of the internal combustion engine, the camshaft is rotated based on the relationship between the current phase of the camshaft and the target phase. An electric valve timing control device, comprising: a control unit that changes a phase changing method for changing from a current phase to the target phase.

The control unit
When the relative rotation phase of the camshaft is changed by the electric valve timing device after the internal combustion engine is stopped, the camshaft is controlled based on the relationship between the current phase of the camshaft and the target phase. from the current phase to the target phase in a first direction to change the camshaft to the target phase;
After the first operation rotates the camshaft by a predetermined phase amount in a second direction away from the target phase, the second operation rotates the camshaft in the first direction to rotate the cam. 2. The electric valve timing control device according to claim 1, further comprising a second phase changing method for changing the shaft to the target phase.

The control unit
When the target phase of the camshaft is viewed from the current phase, and it is assumed that the camshaft is rotated in the first direction from the current phase, a current equal to or less than the target current flows through the motor. , the first phase change method is selected, and the second phase change method is selected when the current exceeds the target current in the motor is set. The electric valve timing control device according to claim 2.

The control unit
Assuming that the camshaft is rotated in the first direction from the current phase, if the cam pivotally supported by the camshaft rotates in the direction opposite to the direction in which the valve spring is pushed in, the selecting a first phase change method;
3. The electric valve timing control device according to claim 2, wherein the second phase change method is selected when the cam rotates in a direction to push the valve spring.

The control unit
Assuming that the camshaft is rotated in the first direction from the current phase, the contactor provided between the cam pivotally supported by the camshaft and the valve spring is the cam crest of the cam. when rotating in the downward direction, select the first phase change method,
3. The electric valve timing control device according to claim 2, wherein the second phase change method is selected when the contactor rotates in a direction to climb the cam ridge.

In the electric valve timing control device, the current phase of the camshaft is set to a first axis, and the target phase of the camshaft is set to a second axis. Map information defining the phase change method at the intersection with the axis,
The electric valve according to any one of claims 1 to 5, wherein the control unit switches the phase changing method by referring to the map information based on the current phase and the target phase of the camshaft. timing controller.

The electric valve timing device includes a control unit containing a motor sensor that outputs a signal corresponding to rotation of the motor,
The control unit
By receiving the output signal of the motor sensor as the motor rotation speed and the motor rotation direction from the control unit of the electric valve timing device, the phase change amount and the phase of the electric valve timing device after the stop processing of the internal combustion engine are detected. 2. The electric valve timing control device of claim 1, wherein the change direction is detected.

An electric valve timing control method using an electric valve timing control device that controls an electric valve timing device that changes valve timing by changing the relative rotation phase of a camshaft with respect to a crankshaft of an internal combustion engine by a motor connected to the camshaft. and
The control unit of the electric valve timing control device,
a process of detecting the relationship between the current phase of the camshaft and the target phase after the process of stopping the internal combustion engine;
When the relative rotation phase of the camshaft is changed by the electric valve timing device, a process of changing the camshaft from the current phase to the target phase is executed based on the result of the detection. Timing control method.