Method and apparatus for switching on and off the internal combustion engine of a vehicle

1. A method for switching on and off an internal combustion engine of a vehicle connected to a drive train by means of a manual transmission, the manual transmission being associated with a clutch for producing and releasing a frictional connection between the internal combustion engine and the drive train, the clutch having a clutch operator actuable by a driver by means of a clutch pedal, said method comprising:

detecting a variable representing an engaging speed of the clutch operator and interrupting starting of the internal combustion engine if this variable exceeds a limit value.

2. The method as claimed in claim 1 , wherein starting of the internal combustion engine is derived on the basis of signals representing actuations of a brake pedal.

3. The method as claimed in claim 1 , wherein at least one of the variables of engaging speed of the clutch operator, actuating speed of the clutch pedal, or a variable coupled to one of these variables is detected as a measure for the engaging speed.

4. The method as claimed in claim 1 , wherein the beginning of a frictional connection to the clutch operator is derived from at least one of the variables of rotational speed of the engine, rotational speed of the wheels, vehicle speed, vehicle acceleration, and driving torque at a drive shaft.

5. The method as claimed in claim 1 , wherein the beginning of a frictional connection to the clutch operator is derived from speed changes of the clutch operator.

6. The method as claimed in claim 4 , wherein the beginning of a frictional connection to the clutch operator is derived from speed changes of the clutch operator.

7. A method for switching on and off an internal combustion engine of a vehicle connected to a drive train by means of a manual transmission, the manual transmission being associated with a clutch for producing and releasing a frictional connection between the internal combustion engine and the drive train, the clutch having a clutch operator actuable by a driver by means of a clutch pedal, said method comprising:

detecting a variable representing an engaging speed of the clutch operator and interrupting starting of the internal combustion engine if this variable exceeds a limit value,

wherein the limit value is predetermined as a function of a position of the clutch operator of the clutch.

8. The method as claimed in claim 7 , wherein the limit value is greater in a first region, which extends between a completely released position of the clutch and beginning of a frictional connection to the clutch operator, than an engaging speed of the clutch operator that occurs at maximum actuating speed of the clutch pedal.

9. The method as claimed in claim 7 , wherein movement of said clutch includes:

a first region extending between a completely released position of the clutch and beginning of a frictional connection between said engine and said transmission,

a second region extending between the beginning of said frictional connection to a slip-free connection between said engine and said transmission, and

a third region with said slip free connection.

10. The method as claimed in claim 9 , wherein in the third region, in which region the clutch is slip-free, the limit value is at least as large as a maximum engaging speed of the clutch operator.

11. The method as claimed in claim 9 , wherein in the second region, the limit value is lower than a maximum engaging speed of the clutch operator.

12. The method as claimed in claim 11 , wherein in the second region, the limit value is a fraction of the limit value of an adjacent region.

13. The method as claimed in claim 11 , wherein the limit value is predetermined in a changeable manner in the second region.