System and method for controlling a brake system

• US 8,924,115 B2
• Filed: 12/22/2011
• Issued: 12/30/2014
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Rahman, Mohammad, Behn, Mark, Gnagey, Aaron, Roal, James, Shively, Kirk, Smith, Cory
• Primary Examiner(s): Cheung, Calvin
• Assistant Examiner(s): Martinez Borrero, Luis A
• Application Number:
  US13/335,134
• Publication Number:
  US 20120330524A1
• Time in Patent Office: 1,104 Days
• Field of Search: 701/70, 701/41, 701/94, 701/1, 701/102, 701/76, 701/93, 180/275, 180/315, 180/19.1, 180/204, 180/21, 180/2.2, 180/402, 180/415, 477/122, 477/125, 477/176, 477/174, 477/86
• US Class Current: 701/70
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 7/122 for locking of reverse movement
• CPC Class Codes: B60W 10/103 of fluid type
• CPC Class Codes: B60W 10/182 including control of parking brakes
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 2510/186 Status of parking brakes
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2540/16 Ratio selector position
• CPC Class Codes: B60W 2710/1005 Transmission ratio engaged
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: B60W 30/18036 Reversing
• CPC Class Codes: B60Y 2200/411 Bulldozers, Graders

Abstract

The disclosure describes, in one aspect, a control system for controlling a braking system. The control system includes a parking brake operatively to at least one wheel, a park brake override mechanism operatively associated with the parking brake, an inching pedal operatively coupled to a transmission, a shift lever operatively coupled to the transmission, at least one sensor operatively coupled to the parking brake to detect when the parking brake is engaged, at least one sensor operatively coupled to the inching pedal to detect a depression of the inching pedal, and at least one sensor operatively coupled to the shift lever for detecting at least one of a forward or reverse gear selection. The control system further includes a controller operatively coupled to the at least one sensors to receive corresponding signals and adapted to control the engagement of the parking brake when the inching pedal is depressed and the at least one of the forward or reverse gear selections is desired.

Claims

1. A method for controlling a movement of a machine including a braking system, the braking system including a parking brake, the method comprising:

determining, by a microprocessor, an engagement of the parking brake;

determining, by the microprocessor, a gear shift from a neutral gear to at least one of a forward gear or a reverse gear;

determining, by the microprocessor, an engagement of an inching pedal; and

controlling, by the microprocessor, the movement of the machine, wherein controlling the movement of the machine includes actuating the at least one of a forward or a reverse gear selection according to the gear shift determination and causing the machine to move accordingly in response to the engagement of the inching pedal, wherein controlling the movement of the machine further includes automatically releasing, by the microprocessor, the parking brake in response to the engagement of the inching pedal.

2. The method of claim 1, wherein the engagement of the inching pedal is a function of a percentage of depression of the inching pedal.

3. The method of claim 2, wherein controlling the movement of the machine includes depressing the inching pedal at least one of equal to or more than a threshold percentage of depression.

4. The method of claim 2, wherein controlling the movement of the machine includes depressing the inching pedal more than a threshold percentage of depression.

5. The method of claim 2, wherein controlling the movement of the machine includes depressing the inching pedal 100 percentage of depression.

6. The method of claim 1, wherein controlling the movement of the machine is based on an engagement of a park brake override switch, wherein the parking brake is automatically released in response to the engagement of the inching pedal when engaging the override switch activates a parking brake override mode.

7. The method of claim 1, wherein controlling the movement of the machine is based on an aligned steering, wherein the at least one of a forward or a reverse gear selection is actuated when the steering is aligned.

8. The method of claim 7, wherein controlling the movement of the machine is based on an aligned steering and a released inching pedal, wherein the at least one of a forward or a reverse gear selection is actuated when the steering is aligned and the inching pedal is being released.

9. The method of claim 7, wherein controlling the movement of the machine includes allowing only up-shifts in response to the at least one of a forward or a reverse gear selection.

10. A control system for controlling a movement of a machine including a braking system, the braking system including a parking brake, the control system comprising:

a position sensor operatively associated with an inching pedal, the position sensor is configured to provide a signal indicative of a position of the inching pedal;

a sensor operatively associated with a transmission;

a sensor operatively associated with the parking brake;

a controller operatively connected to the parking brake, the inching pedal position sensor, the transmission sensor, and the parking brake sensor, the controller configured to;

determine an engagement of the parking brake from the parking brake sensor;

determine a gear shift from a neutral gear to at least one of a forward gear or a reverse gear from the transmission sensor;

determine an engagement of an inching pedal from the inching pedal position sensor; and

control the movement of the machine based on the gear shift determination and engagement of the inching pedal, wherein controlling the movement of the machine includes actuating the at least one of a forward or a reverse gear selection according to the gear shift determination, automatically releasing the parking brake in response to the engagement of the inching pedal, and causing the machine to move according to the gear shift determination.

11. The control system of claim 10, wherein the engagement of the inching pedal is a function of a percentage of depression of the inching pedal.

12. The control system of claim 11, wherein controlling the movement of the machine includes depressing the inching pedal at least one of equal to or more than a threshold percentage of depression.

13. The control system of claim 11, wherein controlling the movement of the machine includes depressing the inching pedal more than a threshold percentage of depression.

14. The control system of claim 11, wherein controlling the movement of the machine includes depressing the inching pedal 100 percentage of depression.

15. The control system of claim 10, wherein controlling the movement of the machine is based on an aligned steering, wherein the at least one of a forward or a reverse gear selection is actuated when the steering is aligned.

16. The control system of claim 15, wherein controlling the movement of the machine is based on an aligned steering and a released inching pedal, wherein the at least one of a forward or a reverse gear selection is actuated when the steering is aligned and the inching pedal is being released.

17. The control system of claim 15, wherein controlling the movement of the machine includes allowing only up-shifts in response to the at least one of a forward or a reverse gear selection.

18. The control system of claim 17, wherein controlling the movement of the machine according to the detected gear selection includes causing the steering to be automatically aligned until the steering is fully aligned and allowing only the up-shifts when the steering is fully aligned.

19. A control system for controlling a movement of a machine including a braking system, the braking system including a parking brake operatively associated with at least one wheel, the control system comprising:

a parking brake override mechanism operatively associated with the parking brake;

an inching pedal operatively coupled to a transmission;

a shift lever operatively coupled to the transmission;

at least one sensor operatively coupled to the inching pedal to detect a depression of the inching pedal;

at least one sensor operatively coupled to the shift lever for detecting at least one of a forward or reverse gear selection;

a controller operatively coupled to the at least one sensors to receive corresponding signals and configured to;

control the engagement of the parking brake when the parking brake override mechanism is activated, the inching pedal is depressed, and the at least one of the forward or reverse gear selections is detected, wherein control the engagement of the parking brake includes automatically releasing the parking brake when the inching pedal is depressed and causing the movement of the machine according to the detected gear selection.

20. The control system of claim 19, wherein controlling the engagement of the parking brake is based on an aligned steering.