Control of a hydraulic coupling system

• US 7,007,782 B2
• Filed: 01/14/2004
• Issued: 03/07/2006
• Est. Priority Date: 02/14/2003
• Status: Expired due to Fees

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Automotive Components Holdings LLC (Ford Motor Company)
• Inventors: Szalony, Norman, Tan, Hualin, McKenzie, Clive, Lee, Hyeongcheol, Anwar, Sohel, Shen, Stephen, Duan, Xiaohong N., Wisniewski, Dean T.
• Primary Examiner(s): Lorence, Richard M.
• Application Number:
  US10/758,324
• Publication Number:
  US 20040159520A1
• Time in Patent Office: 783 Days
• Field of Search: 192/70.12, 192/82.T, 192/103.F, 192/109.F, 192/113.35
• US Class Current: 192/70.12
• CPC Class Codes: F16D 2048/029 Hydraulic circuits combining clutch actuation with clutch lubrication or cooling
• CPC Class Codes: F16D 25/123 in view of cooling and lubrication
• CPC Class Codes: F16D 25/14 Fluid pressure control
• CPC Class Codes: F16D 2500/1026 Hydraulic
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/3024 Pressure
• CPC Class Codes: F16D 2500/30421 Torque of the output shaft
• CPC Class Codes: F16D 2500/3056 Cooling oil temperature
• CPC Class Codes: F16D 2500/3064 Temperature of the engine
• CPC Class Codes: F16D 2500/3104 Travelled distance
• CPC Class Codes: F16D 2500/3108 Vehicle speed
• CPC Class Codes: F16D 2500/5023 Determination of the clutch wear
• CPC Class Codes: F16D 2500/5106 Overheat protection
• CPC Class Codes: F16D 2500/525 Improve response of control system
• CPC Class Codes: F16D 2500/70418 Current
• CPC Class Codes: F16D 2500/7109 Pulsed signal; Generating or processing pulsed signals; PWM, width modulation, frequency or amplitude modulation
• CPC Class Codes: F16D 48/02 Control by fluid pressure
• CPC Class Codes: F16D 48/066 Control of fluid pressure, e.g. using an accumulator F16D48/062, F16D48/068 take precedence

Abstract

This invention describes a control method for a hydraulic coupling system that includes pressurizing a fluid in an actuator coupled to a multi-disk clutch pack to engage the clutch pack, pumping the fluid through the clutch pack to cool the clutch pack, and controlling one or more valve actuators and one or more pump-motors with a controller. The control method may incorporate pulse width modulation of the actuators, such as the actuators for the pump-motor and valve.

Claims

1. A method of controlling a hydraulic coupling system, comprising

pressurizing a fluid in an actuator coupled to a multi-disk clutch pack to engage the clutch pack;

pumping the fluid through the clutch pack to cool the clutch pack; and

transmitting pulse-width modulated control commands from a controller to a set of valves and at least one pump to control the operation of the set of valves and the at least one pump.

2. The method of claim 1 further comprising monitoring dynamics of a vehicle, the engagement of the clutch pack being based on the dynamics of the vehicle.

3. The method of claim 1 further comprising monitoring or estimating the pressure of the fluid in the actuator, a control algorithm implemented in the microcontroller being based on the monitorec or estimated pressure.

4. The method of claim 1 further comprising monitoring or estimating the fluid temperature.

5. The method of claim 4 further comprising adjusting the pressure so that the fluid temperature does not exceed an upper threshold.

6. The method of claim 1 further comprising monitoring or estimating a motor temperature.

7. The method of claim 6 further comprising adjusting a motor command so that the motor temperature does not exceed an upper threshold.

8. The method of claim 1 further comprising monitoring performance of the clutch pack.

9. The method of claim 8 further comprising adjusting a control algorithm implemented in the microcontroller to optimize the performance of the clutch pack.

10. The method of claim 9 further comprising monitoring the wear of the clutch pack.

11. The method of claim 10 further comprising adjusting the control algorithm to compensate for wear of the clutch pack.

12. The method of claim 1 further comprising following a break-in strategy.

13. The method of claim 12 wherein the break-in strategy cures the surfaces of the clutch pack.

14. The method of claim 1 further comprising following a lubrication warm-up strategy.

15. The method of claim 14 wherein the lubrication warm-up strategy optimizes the cold performance of the clutch pack.

16. The method of claim 1 further comprising providing known torque output based on a given pressure, temperature and speed difference across the disks of the clutch pack.

17. The method of claim 1 further comprising monitoring and controlling the pump motor and the valves for faster response and electrical energy saving.

18. The method of claim 1 further comprising monitoring temperature, clutch engagement time, applied pressure, and pump actuation to control the valves for temperature compensation.

19. The method of claim 1 further comprising estimating applied pressure from temperature, pulse width modulated signals associated with the valve and pump, and time.