Technologies for enhancing performance of a clutch that is installed in connection with a transport climate control system is provided. Enhancing performance of the clutch can be performed by establishing engagement cycling parameters for the clutch, cycling the clutch through a repetition of engagement and disengagement in accordance with the established engagement cycling parameters, and terminating the cycling upon achievement of at least one predetermined criterion.

A method for controlling a clutch unit for a drive train of a motor vehicle, wherein the clutch unit comprises a wet-running friction clutch for controllably transmitting torque from an input element to an output element of the clutch unit, wherein the clutch unit comprises oil for cooling the friction clutch, wherein heat inputs which contribute to heating the oil of the clutch unit are calculated, heat outflows which contribute to cooling the oil of the clutch unit are calculated and, as a function of the heat inputs and heat outflows, a maximum admissible clutch torque is calculated, and wherein the current clutch torque of the friction clutch is limited to the maximum admissible clutch torque.

The present invention relates to a method for controlling a clutch arrangement (102) of a vehicle transmission (100) arranged within a gearbox housing (104) of a vehicle, the clutch arrangement being connected to a pneumatically controlled actuator arrangement (106) for controllably arrange the clutch arrangement between a closed position and an open position, wherein the vehicle transmission further comprises at least one rotatable transmission component (108, 108′, 108″) configured to assume an engaged state, a disengaged state and an at least partially engaged state. By means of the method, the rotatable transmission component is arranged to be positioned in the at least partially engaged state for increasing the heat within the gearbox housing.

A method for determining an actuator path of a hydraulic clutch actuator, includes measuring a first temperature of the hydraulic clutch actuator with a first temperature sensor, measuring a second temperature of the hydraulic clutch actuator with a second temperature sensor, calculating a first temperature difference between the first temperature and the second temperature, using the first temperature or the second temperature as a clutch actuator temperature to determine a compensation value of the actuator path when the first temperature difference is less than a threshold value, and modifying the actuator path using the compensation value. In an example embodiment, the first temperature sensor measures a one of a circuit board temperature, an angle sensor temperature or a pressure sensor temperature, and the second temperature sensor measures another one of the circuit board temperature, the angle sensor temperature or the pressure sensor temperature.

Setting a system pressure for a hydraulically actuated clutch comprises

a) Providing a system comprising a pump drivable by an electrically operated motor controlled by a control unit that senses a motor current and rotational speed and a system temperature is determined;

b) a characteristic diagram is provided specifying values for at least the motor current and rotational speed for different system operating points;

c) Accessing the characteristic diagram while operating a vehicle;

d) Sensing at least the motor current and rotational speed at at least a first operating point and determining the system temperature ;

e) Comparing the values, acquired in step d) for the current and speed with the values for the current and rotational speed from the characteristic diagram according to step b);

f) Adapting the characteristic diagram for the system on the basis of the parameters determined in step d).

A method for determining an actuator path of a hydraulic clutch actuator, includes measuring a first temperature of the hydraulic clutch actuator with a first temperature sensor, measuring a second temperature of the hydraulic clutch actuator with a second temperature sensor, calculating a first temperature difference between the first temperature and the second temperature, using the first temperature or the second temperature as a clutch actuator temperature to determine a compensation value of the actuator path when the first temperature difference is less than a threshold value, and modifying the actuator path using the compensation value. In an example embodiment, the first temperature sensor measures a one of a circuit board temperature, an angle sensor temperature or a pressure sensor temperature, and the second temperature sensor measures another one of the circuit board temperature, the angle sensor temperature or the pressure sensor temperature.

The present invention relates to a method for controlling a clutch arrangement (102) of a vehicle transmission (100) arranged within a gearbox housing (104) of a vehicle, the clutch arrangement being connected to a pneumatically controlled actuator arrangement (106) for controllably arrange the clutch arrangement between a closed position and an open position, wherein the vehicle transmission further comprises at least one rotatable transmission component (108, 108, 108) configured to assume an engaged state, a disengaged state and an at least partially engaged state. By means of the method, the rotatable transmission component is arranged to be positioned in the at least partially engaged state for increasing the heat within the gearbox housing.

A basic pulse time setting section determines a basic pulse time for initial invalid stroke elimination by applying current values of oil temperature and throttle opening to the basic pulse time map. A subtraction time setting section determines a subtraction time by applying current values of oil temperature and clutch oil pressure to the subtraction time map. A pulse time determining section determines a predetermined initial invalid stroke elimination pulse time by subtracting the subtraction time from the basic pulse time. An initial invalid stroke elimination permission/inhibition determination section, at a starting timing of initial invalid stroke elimination, inhibits this-time initial invalid stroke elimination if the elapsed time from the execution timing of the preceding initial invalid stroke elimination is within the predetermined inhibition period.

One solenoid valve included in a hydraulic pressure control device has at least two functions among the following (1) to (6) functions, (1) switching a state of a two-way clutch, (2) switching a state of a parking lock mechanism, (3) switching the supply of hydraulic pressure to a first brake that is put into an engaged state when a gear stage selected when driving of a vehicle starts is set, (4) controlling a line pressure adjustment valve so that a decrease in a line pressure is prevented when the temperature of a hydraulic fluid is a first predetermined temperature or higher, (5) preventing the occurrence of a creep phenomenon in a neutral range when the temperature of the hydraulic fluid is a second predetermined temperature or lower, and (6) boosting a line pressure by performing switching to another linear solenoid valve when the line pressure adjustment valve has failed.

A method for controlling a pneumatic actuator (1) of a transmission having at least one sealing element (6, 7) that is arranged between two elements (2, 3) of the actuator (1) that move relative to one another, and within a specifiable operating temperature range in which a leakproofness of the actuator (1) is ensured. The pneumatic actuator is acted upon with compressed air from an air supply system for actuating a transmission component. When a temperature of the actuator (1) is below a glass transition temperature of the at least one sealing element (6, 7), the actuator (1) is acted upon with pre-heated compressed air from the air supply system to warm up the at least one sealing element (6, 7) above the glass transition temperature.