Failure diagnosis method of coolant temperature sensor for vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsJung Sup Byun, Seong Kyu Park
Life of this patent
Estimating the term…
Abstract
A failure diagnosis method of a coolant temperature sensor for a vehicle, may include determining, by a controller, whether or not it is in a flow stop state that stagnates the flow of coolant by a flow control valve; obtaining, by the controller, an engine outlet coolant model temperature when it is in the flow stop state; and diagnosing, by the controller, as a failure of an engine outlet-side outlet water temperature sensor when the coolant model temperature is equal to or greater than a reference temperature and the flow stop state is maintained by the flow control valve.
Claims15
A failure diagnosis method of an engine outlet-side outlet coolant temperature sensor for a vehicle, the failure diagnosis method comprising:
- determining, by a controller, when a flow control valve is in a flow stop state that stagnates a flow of coolant by the flow control valve;
- obtaining, by the controller, an engine outlet coolant model temperature determined based on operation conditions of the vehicle, when the flow control valve is in the flow stop state;
- diagnosing, by the controller, the engine outlet-side outlet coolant temperature sensor to be in a failure, when the engine outlet coolant model temperature is equal to or greater than a reference temperature and when the flow stop state is maintained by the flow control valve for a predetermined time;
- and
- releasing, by the controller, the flow stop state by operating the flow control valve so that the coolant flows through a first discharge port of the flow control valve when the engine outlet-side outlet coolant temperature is diagnosed, by the controller, as the failure of the engine outlet-side coolant temperature sensor, wherein opening of the first discharge port is adjustable by the controller,
- wherein the flow control valve includes the first discharge port, a second discharge port connected to a heat exchanger and a third discharge port connected to a radiator, and an input port connected to an engine block,
- wherein openings of the second and third discharge ports and the input ports are adjustable by the controller, and
- wherein an engine head and the flow control valve are connected to each other and the engine outlet-side outlet coolant temperature sensor is mounted between the engine head and the flow control valve.
A failure diagnosis method of an engine outlet-side outlet coolant temperature sensor for a vehicle, the failure diagnosis method comprising:
- determining, by a controller, when a flow control valve is in a flow stop state that stagnates a flow of coolant by the flow control valve;
- diagnosing, by the controller, the engine outlet-side coolant temperature sensor to be in a failure, when a difference between a maximum value and a minimum value of outlet coolant temperature is within a predetermined range or diagnosing, by the controller, as the failure of the engine outlet-side coolant temperature sensor when an inlet coolant temperature is greater than the outlet coolant temperature and when the flow stop state is maintained by the flow control valve for a predetermined time.
A failure diagnosis method of an engine outlet-side outlet coolant temperature sensor for a vehicle, the failure diagnosis method comprising:
- determining, by a controller, when a flow control valve is in a flow stop state that stagnates a flow of coolant by the flow control valve;
- counting, by the controller, a flow stop time when the flow control valve is determined by the controller to be in the flow stop state;
- and
- diagnosing, by the controller, the engine outlet-side coolant temperature sensor to be in a failure, when the flow stop time is equal to or greater than a reference time and when the flow stop state is maintained by the flow control valve for a predetermined time.
Dependencies are inferred from the claim text.