Control system and control method for coolant control valve unit

Patent metadata

Field	Value
Publication number	US-10731541-B2
Application number	US-201816204773-A
Country	US
Kind code	B2
Filing date	Nov 29, 2018
Priority date	Sep 17, 2018
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A control system for a coolant control valve unit, which includes a cam and a valve that opens and closes a coolant passage in conjunction with rotation of the cam, includes: a motor controlling the rotation of the cam; and a controller configured to correct a target valve opening degree of the valve using a correction value according to a degree of wear of the valve, to determine a target rotational angle of the cam using the target valve opening degree corrected by the correction value, and to control an operation of the motor according to the target rotational angle of the cam.

First claim

What is claimed is:

1. A control system for a coolant control valve unit, which includes a cam and a valve that opens and closes a coolant passage in conjunction with rotation of the cam, the control system comprises:
a motor controlling the rotation of the cam; and
a controller configured to:
correct a target valve opening degree of the valve using a correction value;
determine a target rotational angle of the cam using the target valve opening degree corrected by the correction value; and
control an operation of the motor according to the target rotational angle of the cam,
wherein the controller accumulates a rotational angle of the cam to obtain a rotational angle cumulative value and determines the correction value according to the rotational angle cumulative value.

2. The control system of claim 1 , wherein the correction value increases as the cumulative rotational angle value increases.

3. The control system of claim 1 , further comprises a cam position detecting sensor detecting the rotational angle of the cam.

4. The control system of claim 1 , wherein the controller controls the operation of the motor based on a difference between an actual rotational angle of the cam and the target rotational angle.

5. The control system of claim 1 , wherein the controller calculates the target valve opening degree based on a driving condition of the coolant control valve unit and a difference between a target coolant temperature and current coolant temperature.

6. A control method for a coolant control valve unit, which includes a cam driven by a motor and a valve that opens and closes a coolant passage in conjunction with rotation of the cam, the control method comprises steps of:
calculating, by a controller, a target valve opening degree of the valve;
correcting, by the controller, the target valve opening degree of the valve using a correction value;
determining, by the controller, a target rotational angle of the cam using the target valve opening degree corrected by the correction value;
controlling, by the controller, an operation of the motor according to the target rotational angle of the cam;
accumulating, by the controller, a rotational angle of the cam to obtain a rotational angle cumulative value; and
determining, by the controller, the correction value according to the rotational angle cumulative value.

7. The control method of claim 6 , wherein the correction value increases as the cumulative rotational angle value increases.

8. The control method of claim 6 , further comprising a step of obtaining, by the controller, an actual rotational angle of the cam, and
wherein the controller controls the operation of the motor based on a difference between the actual rotational angle of the cam and the target rotational angle.

9. The control method of claim 6 , wherein the step of calculating the target valve opening degree of the valve comprises:
obtaining a driving condition of the coolant control valve unit; and
calculating the target valve opening degree based on the driving condition of the coolant control valve unit and a difference between a target coolant temperature and a current coolant temperature.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Yonggyu

Classifications

• F16K31/52416

  comprising a multiple-way lift valve · CPC title

• F16K11/165

  with the rotating spindles parallel to the closure members · CPC title

• F01P2025/08

  Temperature · CPC title

• F01P7/16 Primary

  by thermostatic control · CPC title

• F01P2007/146

  using valves · CPC title