Fault diagnosis apparatus of coolant circulation system for vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsGun Seok Yoon, Jin Oh, Hyun Jun Soh
Life of this patent
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Abstract
A fault diagnosis apparatus of a coolant circulation system for a vehicle includes: a water pump for circulating coolant; a controller for applying a revolutions per minute (RPM) command to the water pump; a water pump driver for operating the water pump depending on the applied RPM command; and a current sensor for sensing an current input to the water pump driver. The controller determines whether the input current sensed by the current sensor is within a predetermined normal range to determine whether the coolant circulation system is failed or not.
Claims10
A fault diagnosis apparatus of a coolant circulation system for a vehicle, comprising:
- a water pump for circulating coolant;
- a controller for applying a revolutions per minute (RPM) command to the water pump;
- a water pump driver for operating the water pump depending on the applied RPM command;
- a current sensor for sensing a current input to the water pump driver;
- and
- an RPM sensor for sensing an actual RPM of the water pump driver,
- wherein the controller determines whether the input current sensed by the current sensor is within a first predetermined normal range to determine whether the coolant circulation system is failed or not,
- wherein the controller determines whether the coolant circulation system is failed or not by determining whether the actual RPM sensed by the RPM sensor is within a second predetermined normal range, and
- wherein the controller determines a load shortage fault of the coolant circulation system when the input current is equal to or lower than a lower limit value of the first predetermined normal range and the actual RPM is equal to or greater than an upper limit value of the second predetermined normal range, and starts a fault count when the load shortage fault is determined.
A fault diagnosis apparatus of a coolant circulation system for a vehicle, comprising:
- a water pump for circulating coolant;
- a controller for applying a revolutions per minute (RPM) command to the water pump;
- a water pump driver for operating the water pump depending on the applied RPM command;
- a current sensor for sensing a current input to the water pump driver;
- and
- an RPM sensor for sensing an actual RPM of the water pump driver,
- wherein the controller determines whether the input current sensed by the current sensor is within a first predetermined normal range to determine whether the coolant circulation system is failed or not,
- wherein the controller determines whether the coolant circulation system is failed or not by determining whether the actual RPM sensed by the RPM sensor is within a second predetermined normal range, and
- wherein the controller determines an excessive load fault of the coolant circulation system when the input current is equal to or greater than an upper limit value of the first predetermined normal range and the actual RPM is equal to or lower than a lower limit value of the second predetermined normal range, and starts a fault count when the excessive load fault is determined.
Dependencies are inferred from the claim text.