Method and control device for detecting the direction of rotation of a drive shaft of an internal combustion engine for a motor vehicle
In a method for determining the direction of rotation of a drive shaft ( 13 ) of an internal combustion engine ( 1 ) without using a sensor specifically provided therefor, an operating variable of the internal combustion engine ( 1 ) is measured using a sensor in a gas line ( 40, 16 ), which connects a combustion chamber ( 30 ) of the internal combustion engine ( 1 ) to the surrounding area. The operating variable is calculated using a model. A forward direction of rotation of the drive shaft ( 13 ) is detected if the difference between the measured value of the operating variable and the model value of the operating variable lies within a specified tolerance range. Otherwise, a reverse direction of rotation of the drive shaft ( 13 ) is detected, which is opposite of the forward direction of rotation.
1. A control device for an internal combustion engine, which is operable to detect the direction of rotation of a drive shaft of the internal combustion engine by
measuring a value of an operating variable of the internal combustion engine using a sensor in a gas line which connects a combustion chamber of the internal combustion engine to the surrounding area,
calculating a model value of the operating variable using a model, and
determining a forward direction of rotation of the drive shaft if the difference between the measured value of the operating variable and the model value of the operating variable lies within a specified tolerance range, and otherwise determining a reverse direction of rotation of the drive shaft which is opposite to the forward direction of rotation.
2. The control device according to claim 1 , wherein the operating variable is one of the following variables:
the pressure at a position inside an intake tract or an exhaust tract of the internal combustion engine,
the temperature at a position inside the intake tract or an exhaust tract of the internal combustion engine,
the gas flow rate in the intake tract of the internal combustion engine.
3. The control device according to claim 1 , wherein the control device is further operable to suppress the fuel supply if it is detected that the drive shaft is rotating in the reverse direction of rotation.
4. The control device according to claim 3 , wherein the fuel supply is released or remains released if the speed of the motor vehicle is greater than a specified speed threshold value.
5. The control device according to claim 3 , wherein the fuel supply is released or remains released if the rotational speed of the drive shaft is greater than a specified rotational speed threshold value.
6. The control device according to claim 3 , wherein the fuel supply is released or remains released if the drive shaft is rotated by a starter motor associated with the internal combustion engine or if a request to start the internal combustion engine is detected.
7. The control device according to claim 1 , wherein with fuel supply disabled, the control device is further operable to determine firstly the direction of rotation of the drive shaft and fuel supply is only enabled in the situation when it is detected that the drive shaft is rotating in the forward direction of rotation.
8. A control device for an internal combustion engine, comprising a sensor in a gas line which connects a combustion chamber of the internal combustion engine to a surrounding area, the sensor being operable to measure a value of an operating variable of the internal combustion engine, wherein the control device is software controlled to:
calculate a model value of the operating variable using a model, and
to determine a forward direction of rotation of the drive shaft if the difference between the measured value of the operating variable and the model value of the operating variable lies within a specified tolerance range, and otherwise to determine a reverse direction of rotation of the drive shaft which is opposite to the forward direction of rotation.
9. The control device according to claim 8 , wherein the operating variable is one of the following variables:
the pressure at a position inside an intake tract or an exhaust tract of the internal combustion engine,
the temperature at a position inside the intake tract or an exhaust tract of the internal combustion engine,
the gas flow rate in the intake tract of the internal combustion engine.
10. The control device according to claim 8 , wherein the control device is further software controlled to suppress the fuel supply if it is detected that the drive shaft is rotating in the reverse direction of rotation.
11. The control device according to claim 10 , wherein the fuel supply is released or remains released if the speed of the motor vehicle is greater than a specified speed threshold value or if the rotational speed of the drive shaft is greater than a specified rotational speed threshold value.
12. The control device according to claim 10 , wherein the fuel supply is released or remains released if the drive shaft is rotated by a starter motor associated with the internal combustion engine or if a request to start the internal combustion engine is detected.
13. The control device according to claim 8 , wherein with fuel supply disabled, the control device is further software controlled to determine firstly the direction of rotation of the drive shaft and fuel supply is only enabled in the situation when it is detected that the drive shaft is rotating in the forward direction of rotation.
14. A method for detecting the direction of rotation of a drive shaft of an internal combustion engine for a motor vehicle, comprising:
measuring a value of an operating variable of the internal combustion engine using a sensor in a gas line which connects a combustion chamber of the internal combustion engine to the surrounding area,
calculating a model value of the operating variable using a model, and
detecting a forward direction of rotation of the drive shaft if the difference between the measured value of the operating variable and the model value of the operating variable lies within a specified tolerance range, and otherwise detecting a reverse direction of rotation of the drive shaft which is opposite to the forward direction of rotation.
15. The method according to claim 14 , wherein the operating variable is one of the following variables:
the pressure at a position inside an intake tract or an exhaust tract of the internal combustion engine,
the temperature at a position inside the intake tract or an exhaust tract of the internal combustion engine,
the gas flow rate in the intake tract of the internal combustion engine.
16. The method according to claim 14 , wherein the fuel supply is suppressed if it is detected that the drive shaft is rotating in the reverse direction of rotation.
17. The method according to claim 16 , wherein the fuel supply is released or remains released if the speed of the motor vehicle is greater than a specified speed threshold value.
18. The method according to claim 16 , wherein the fuel supply is released or remains released if the rotational speed of the drive shaft is greater than a specified rotational speed threshold value.
19. The method according to claim 16 , wherein the fuel supply is released or remains released if the drive shaft is rotated by a starter motor associated with the internal combustion engine or if a request to start the internal combustion engine is detected.
20. The method according to claim 14 , wherein with fuel supply disabled firstly the direction of rotation of the drive shaft is determined and fuel supply is only enabled in the situation when it is detected that the drive shaft is rotating in the forward direction of rotation.