Method and apparatus for the control of characteristic operating values of a power train

A method of controlling at least a fifth characteristic operating value of a motor vehicle power train with a clutch device, a transmission device, and an actuating device by means of which a control of a transmission ratio of the transmission device can at least be influenced, wherein the actuating device comprises clutch-disengagement thresholds at which a state of engagement of the clutch device is changed;

• and wherein the clutch-disengagement thresholds are stored in memory, said method comprising the steps of:
• performing an emergency adaptation of at least one of the stored clutch-disengagement thresholds during an operating phase of the motor vehicle, if predetermined third conditions are present;
• and
• performing a non-emergency adaptation of at least one of the stored clutch-disengagement thresholds at the end of said operating phase if predetermined fourth conditions are present.

A method of controlling at least one sixth characteristic operating value of a power train in a motor vehicle comprising an engine producing an engine torque, a clutch device transmitting a clutch torque, a brake device, a transmission device with at least one gear level, and a gas pedal, wherein under certain predetermined conditions, said controlling is performed by using a contact point position of the clutch device, said contact point position being stored in memory and being subject to adaptation under predetermined conditions, said contact point position representing a state of the clutch device or of a clutch-actuating device where the clutch device is at the point of becoming engaged and is able to transmit a predetermined small amount of torque, the method comprising:

• the step of initiating a creep phase of the clutch device, wherein during said creep phase
• the clutch device is moved into an increasing degree of engagement until an increase of the engine torque caused by said increasing engagement has reached a predetermined engine torque value;
• the brake is in a disengaged state and said at least one gear level is in an engaged state;
• the gas pedal is not being actuated;
• an increase in the clutch torque or in a control target value for the clutch torque is controlled as a function of a position of a clutch-actuating element as detected by a position sensor;
• and
• a correlation characteristic correlates predetermined positions of the clutch-actuating element to predetermined amounts of transmissible torque of the clutch device;
• the further step of changing a stored value for the contact point position, if one of the clutch torque and the control target for the clutch torque exceeds a predetermined limit.

A method of controlling at least one sixth characteristic operating value of a power train in a motor vehicle comprising an engine producing an engine torque, a clutch device transmitting a clutch torque, a brake device, a transmission device with at least one gear level, and a gas pedal, wherein under certain predetermined conditions, said controlling is performed by using a contact point position of the clutch device, said contact point position being stored in memory and being subject to adaptation under predetermined conditions, said contact point position representing a state of the clutch device or of a clutch-actuating device where the clutch device is at the point of becoming engaged and is able to transmit a predetermined small amount of torque, the method comprising the steps of:

• a) initiating a creep phase of the clutch device, wherein during said creep phase
• the clutch device is moved into an increasing degree of engagement according to a predetermined characteristic;
• the brake is in a disengaged state and said at least one gear level is in an engaged state;
• the gas pedal is not being actuated;
• an increase in the clutch torque or in a control target value for the clutch torque is controlled as a function of a position of a clutch-actuating element as detected by a position sensor;
• and
• a correlation characteristic correlates predetermined positions of the clutch-actuating element to predetermined amounts of transmissible torque of the clutch device;
• b) monitoring the engine torque;
• and
• c) evaluating whether a controlled change in the transmissible torque of the clutch device conforms to a change in the engine torque that was caused by said controlled change.