Method of determining circulation state of cooling water
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsDong Hun Lee, Kang Sik Jeon
Life of this patent
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Abstract
A method of determining a state of cooling water is provided. The method includes operating, by a controller, a driving motor of a cooling water-circulating pump that is configured to circulate cooling water at a fixed current, a fixed torque, or a fixed power. In addition, the controller is configured to calculate an average rotation speed of the driving motor for a preset first period of time during the operation of the driving motor. Whether the circulation state of the cooling water is normal is determined based on an error between the calculated average rotation speed and a preset reference rotation speed.
Claims23
A method of determining a circulation state of cooling water, comprising:
- operating, by a controller, a driving motor of a cooling water-circulating pump configured to circulate cooling water at a fixed current, a fixed torque, or a fixed power;
- calculating, by the controller, an average rotation speed of the driving motor for a preset first period of time during the operation of the driving motor at the fixed current, the fixed torque, or the fixed power;
- determining, by the controller, whether the circulation state of the cooling water is normal, based on an error value between the calculated average rotation speed and a preset reference rotation speed;
- and
- controlling a cooling system to a safe mode when it is determined that the circulation state of the cooling water is not normal,
- wherein the determination of the circulation state of the cooling water comprises enabling, by the controller, a test mode when the error value exceeds a preset error value,
- wherein the test mode comprises controlling the cooling water-circulating pump at a maximum rotation speed operation, a repetitive alternate operation at a maximum rotation speed and a minimum rotation speed, a ramp acceleration and deceleration operation, or a stepwise acceleration and deceleration operation, and determining whether the circulation state of the cooling water is normal.
A method of determining a circulation state of cooling water, comprising:
- operating, by a controller, a driving motor disposed in a pump for circulating a cooling water to adjust a rotation speed of the driving motor to be constant;
- determining, by the controller, whether the circulation state of the cooling water is normal using a power or a torque value of the driving motor obtained after the rotation speed of the driving motor is adjusted to be constant and a reference power or torque value during a normal state that corresponds to the constant rotation speed;
- and
- controlling a cooling system to a safe mode when it is determined that the circulation state of the cooling water is not normal,
- wherein the power or the torque value of the driving motor, and the reference power or torque value of the driving motor when the driving motor rotates at the constant rotation speed are each obtained using a current command value transmitted to the driving motor and a normal current command value during the normal state that corresponds to the constant rotation speed, and
- wherein the determination of the circulation state of the cooling water includes:
- calculating, by the controller, an average value of the current command values transmitted to the driving motor for a first period of time after the rotation speed of the driving motor is adjusted to be constant;
- and
- enabling, by the controller, a test mode when an error value between the calculated average value and the normal current command value exceeds a preset error value;
- wherein the test mode comprises controlling the cooling water-circulating pump at a predetermined rotation speed, and determining whether the circulation state of the cooling water is normal.
Dependencies are inferred from the claim text.