Transmission control system for reducing thermal load on engaging elements

A transmission and transmission control for varying a thermal load between at least first and second engaging elements of the transmission during a starting phase of the transmission, the transmission having an input shaft, an output shaft, each of said at least first and second engaging elements being allocated to one gear and each said engaging element having a first clutch half for receiving a driving force supplied by said input shaft and a second clutch half for transmitting the supplied driving force toward said output shaft, and a transmission element (11), with a transmission element output shaft, being located in a driving force flow path from said input shaft to said output shaft, said transmission element (11) receiving a driving force from said second clutch half of said first engaging element and said transmission element output shaft transmitting driving force to said first clutch half of said second engaging element, and said transmission control comprising:

• an actuation device being coupled to said at least first and second engaging elements to facilitate control thereof;
• a regulation and control unit communicating with said actuation device, and said regulation and control unit being connected to sensors monitoring said at least first and second engaging elements, each said sensor measuring at least a differential angular velocity and a thermal load of each said engaging elements and transmitting the measured differential angular velocity and the measured thermal load to said regulation and control unit;
• the regulation and control unit comparing the measured thermal load to a thermal load capacity of said at least first and second engaging elements and controlling the actuation device to redistribute the thermal load between said at least first and second engaging elements;
• wherein the thermal load of each engaging element is less than the thermal load capacity of each respective engaging element, and said actuation device redistributes the thermal load by changing the differential angular velocity existing in said at least first and second engaging elements by one of increasing and decreasing a clutch torque in effect via one of supplying and removing pressure from said at least first and second engaging elements.

A transmission and transmission control for varying a thermal load between first, second, third and fourth engaging elements of the transmission during a starting phase of the transmission;

• the transmission having an input shaft, an output shaft, each of said first, second, third and fourth engaging elements being associated with one gear and each said engaging element having a first clutch half for receiving a driving force supplied by said input shaft and a second clutch half for transmitting the supplied driving force toward said output shaft, and a transmission element (11), having a transmission element output shaft, being located in a driving force flow path from said input shaft to said output shaft, said transmission element (11) receiving an input from both said second clutch half of said first engaging element and said second clutch half of said third engaging element and said transmission element output shaft transmitting the driving force both to said first clutch half of said second engaging element and said first clutch half of said fourth engaging element, and said transmission control comprising:
• an actuation device being coupled to said first, second, third and fourth engaging elements to facilitate control thereof;
• a regulation and control unit communicating with said actuation device, and said regulation and control unit being connected to sensors monitoring said first, second, third and fourth engaging elements, each said sensor measuring at least a differential angular velocity and a thermal load of each said first, second, third and fourth engaging elements and transmitting the measured differential angular velocity and the measured thermal load to said regulation and control unit;
• the regulation and control unit comparing the measured thermal load to a thermal load capacity of said first, second, third and fourth engaging elements and controlling the actuation device to redistribute the thermal load between said first, second, third and fourth engaging elements;
• wherein the thermal load of each engaging element is less than the thermal load capacity of each respective engaging element, and said actuation device redistributes the thermal load by changing the differential angular velocity existing in said at least first and second engaging elements by one of increasing and decreasing a clutch torque in effect via one of supplying and removing pressure from said at least first and second engaging elements.