METHOD FOR MONITORING A COOLANT TEMPERATURE SENSOR AND/OR A CYLINDER HEAD TEMPERATURE SENSOR OF A MOTOR VEHICLE AND CONTROL DEVICE
First Claim
1. A method for monitoring at least one of a coolant temperature sensor and a cylinder head temperature sensor of a motor vehicle, the method comprising:
- when an internal combustion engine of the motor vehicle is started, determining an actual value of a coolant temperature by a coolant temperature sensor, and determining an actual value of a cylinder head temperature by a cylinder head temperature sensor, whereinat least one of the coolant temperature sensor and the cylinder head temperature sensor is diagnosed as a functional sensor when the actual values of the coolant temperature and of the cylinder head temperature deviate in the same direction upward in relation to at least one of an outside temperature and an intake air temperature.
1 Assignment
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Accused Products
Abstract
In a method for monitoring a coolant temperature sensor and/or a cylinder head temperature sensor of a motor vehicle, during a start (t=tSt) of an internal combustion engine of the motor vehicle an actual value (TCOist=TCOSt) of a coolant temperature (TCO) is determined by a coolant temperature sensor, and an actual value (TCYLHist=TCYLHSt) of the cylinder head temperature (TCYLH) is determined by a cylinder head temperature sensor, wherein the coolant temperature sensor and/or the cylinder head temperature sensor are diagnosed as functional sensors when the actual values (TCOist, TCYLHist) of the coolant temperature (TCO) and the cylinder heat temperature (TCYLH) deviate in the same direction upward in relation to an outside temperature (TAM) and/or an intake air temperature (TIA). By a control device, particularly a motor control device, a method can be and is carried out accordingly.
23 Citations
20 Claims
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1. A method for monitoring at least one of a coolant temperature sensor and a cylinder head temperature sensor of a motor vehicle, the method comprising:
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when an internal combustion engine of the motor vehicle is started, determining an actual value of a coolant temperature by a coolant temperature sensor, and determining an actual value of a cylinder head temperature by a cylinder head temperature sensor, wherein at least one of the coolant temperature sensor and the cylinder head temperature sensor is diagnosed as a functional sensor when the actual values of the coolant temperature and of the cylinder head temperature deviate in the same direction upward in relation to at least one of an outside temperature and an intake air temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20)
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- 10. A control device or an engine control device for a motor vehicle, wherein the control device is configured when an internal combustion engine of the motor vehicle is started, to determine an actual value of a coolant temperature by a coolant temperature sensor, and to determine an actual value of a cylinder head temperature by a cylinder head temperature sensor, and to diagnose at least one of the coolant temperature sensor and the cylinder head temperature sensor as a functional sensor when the actual values of the coolant temperature and of the cylinder head temperature deviate in the same direction upward in relation to at least one of an outside temperature and an intake air temperature.
Specification