A hydraulic system is presented with a hydraulic fluid, with a work element actuable by the fluid, with a fluid pump for the application of a fluid pressure to the fluid, with the fluid pump being operable to generate a reference depression in the system, and with a pressure sensor for the measureme
A hydraulic system is presented with a hydraulic fluid, with a work element actuable by the fluid, with a fluid pump for the application of a fluid pressure to the fluid, with the fluid pump being operable to generate a reference depression in the system, and with a pressure sensor for the measurement of the fluid pressure which is in communication with a control unit which is designed to carry out a calibration of the pressure sensor with reference to the reference depression.
대표청구항▼
1. A hydraulic system comprising: a hydraulic fluid;a work element actuable by the fluid;a fluid pump for application of a fluid pressure to the fluid, the fluid pump being operable in a first direction to convey fluid pressure to the work element and in a second direction to generate a reference de
1. A hydraulic system comprising: a hydraulic fluid;a work element actuable by the fluid;a fluid pump for application of a fluid pressure to the fluid, the fluid pump being operable in a first direction to convey fluid pressure to the work element and in a second direction to generate a reference depression in the system;a pressure sensor for measurement of the fluid pressure; anda control unit connected to the pressure sensor and operable to carry out a calibration of the pressure sensor with reference to the reference depression. 2. The system in accordance with claim 1, wherein the control unit is further operable to control the fluid pump. 3. The system in accordance with claim 1, further including a line section providing fluid communication between the pump and the work element, wherein the pressure sensor is disposed in the line section between the pump and the work element and wherein the reference depression is established in the line section and compared to the pressure value measured by the pressure sensor to calibrate the pressure sensor. 4. The system in accordance with claim 1, wherein the control unit is designed to operate the fluid pump during the determination of the reference depression at a lower pumping capacity than during the generation of the depression. 5. The system in accordance with claim 1, wherein the control unit determines the reference depression after a preset waiting time following generation of the depression. 6. The system in accordance with claim 1, wherein the control unit determines the reaching of the reference depression by determination of a pressure gradient and by comparison of the pressure gradient with a threshold value. 7. The system in accordance with claim 1, wherein a pressure relief valve is provided for the restriction of the fluid pressure to a minimum value. 8. The system in accordance with claim 1, wherein the control unit carries out the calibration of the pressure sensor while taking account of the actual fluid temperature. 9. The system in accordance with claim 1, wherein the control unit is operable to determine the temperature of the fluid pump and to derive the fluid temperature from this. 10. The system in accordance with claim 1, wherein the work element includes a piston displaceably journalled in a cylinder for actuation of a clutch. 11. The system in accordance with claim 1, wherein the work element is provided for the actuation of a clutch of a torque transfer device. 12. A torque transfer device with a drive shaft and an output shaft, with a clutch for the transfer of a torque from the drive shaft to the output shaft and with a hydraulic system for the actuation of the clutch, wherein the hydraulic system comprises: a hydraulic fluid;a fluid pump for the application of a fluid pressure to the fluid, with the fluid pump being operable in a first direction to convey fluid for actuating the clutch and in a second direction to generate a reference depression in the system;a pressure sensor for the measurement of the fluid pressure; anda control unit connected to the pressure sensor and operable to carry out a calibration of the pressure sensor with reference to the reference depression. 13. A method for the calibration of a pressure sensor which is provided for the measurement of the fluid pressure of a hydraulic fluid contained in a hydraulic system, comprising the steps of actuating a clutch by means of a fluid pump, wherein the clutch is actuated by fluid pressure generated by operation of the fluid pump in a first direction;generating a reference depression in the system by means of the fluid pump, wherein the depression is generated by operation of the fluid pump in a second direction opposite the first direction; andcalibrating the pressure sensor with reference to the reference depression. 14. The method in accordance with claim 13, wherein the calibration of the pressure sensor takes place by a control unit provided for the control of the fluid pump and which is connected to the pressure sensor. 15. The method in accordance with claim 13, wherein the fluid pressure is generated upon operation of the fluid pump in a first direction, and wherein the depression is generated by operation of the fluid pump in a second direction. 16. The method in accordance with claim 13, wherein the fluid pump works at a lower pumping capacity during the determination of the reference depression than during the generation of the depression. 17. The method in accordance with claim 13, wherein the reference depression is only determined after the end of a preset waiting time after the generation of the depression. 18. The method in accordance with claim 13, wherein the reaching of the reference depression is determined by determination of a pressure gradient and by comparison of the pressure gradient with a threshold value. 19. The method in accordance with claim 13, wherein the pressure sensor is calibrated while taking account of the actual fluid temperature. 20. The method in accordance with claim 13, wherein the temperature of the fluid pump is determined and the fluid temperature is derived from this. 21. The method in accordance with claim 13, wherein the hydraulic system serves for the actuation of a clutch. 22. The method in accordance with claim 13, wherein the hydraulic system serves for the actuation of a friction clutch in a torque transfer device.
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