Braking system

Patent metadata

Field	Value
Publication number	US-9625036-B2
Application number	US-201414274246-A
Country	US
Kind code	B2
Filing date	May 9, 2014
Priority date	May 9, 2014
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

The present disclosure relates to a vehicle having a braking system and a method of engaging the braking system. The braking system engages a brake mechanism as a waiting brake. The vehicle has a dual function device which is configured such that when the dual function device is activated when the vehicle transmission system is in a drive mode, the transmission system is maintained in that drive mode, and when the dual function device is activated when the transmission system is in the neutral mode, the brake mechanism is engaged.

First claim

The invention claimed is:

1. A vehicle comprising:
a brake mechanism;
a computer control unit including a control logic for operation of the brake mechanism; and
an automatic transmission system having a plurality of drive modes and a neutral mode, said automatic transmission system comprising a dual function device, said dual function device being configured such that:
when the dual function device is activated when the automatic transmission system is in a drive mode, the automatic transmission system is maintained in that drive mode;
when the dual function device is activated when the automatic transmission system is in the neutral mode, the brake mechanism is engaged; and
the computer control unit monitoring an engine speed and a transmission output speed, the computer control unit and the control logic requiring the engine speed being above a pre-set minimum engine speed and the transmission output speed being below a pre-set maximum transmission output speed before allowing the dual function device to engage the brake mechanism.

2. The vehicle as claimed in claim 1 , in which the dual function device is a switch activated by a user manually articulating the switch to an on position.

3. The vehicle as claimed in claim 2 , in which the brake mechanism is engaged after the switch is articulated to the on position to activate the dual function device for a minimum pre-set period.

4. The vehicle as claimed in claim 1 , in which the dual function device is a switch de-activated by a user manually articulating the device switch to an off position.

5. The vehicle as claimed in claim 4 , in which the dual function device is de-activated after the switch is articulated to the off position for a minimum pre-set period.

6. The vehicle as claimed in claim 3 , in which the minimum pre-set period is 0.5 seconds.

7. The vehicle as claimed in claim 1 , in which when the transmission system is in neutral mode, the dual function device is only activatable after the said brake mechanism, or another brake mechanism, has been engaged by a brake actuator.

8. The vehicle as claimed in claim 1 , in which the dual function device is de-activated when a mode of the transmission system is changed from a neutral mode to a drive mode.

9. The vehicle as claimed in claim 1 , in which the vehicle has an engine and the dual function device is only activatable when-the pre-set minimum engine speed being 500 rpm for the pre-determined time of 2 seconds and the pre-set maximum transmission output speed being 30 rpm is detected by the computer control unit.

10. The vehicle as claimed in claim 1 , in which the vehicle has an engine and the dual function device is de-activated when the engine is switched off.

11. The vehicle as claimed in claim 1 , in which the transmission system further comprises a transmission gear select lever for changing the transmission system mode and the dual function device is mounted on the transmission gear select lever.

12. A method of engaging a brake mechanism in a vehicle having a braking system, a computer control unit, and an automatic transmission system having at least one drive mode and a neutral mode, said method comprising the steps of:
placing the automatic transmission system in neutral mode; and
activating a dual function device, said dual function device being configured such that:
when the dual function device is activated when the automatic transmission system is in a drive mode, the transmission system is maintained in that drive mode;
when the dual function device is activated when the automatic transmission system is in the neutral mode, the brake mechanism is engaged; and
the computer control unit monitoring an engine speed and a transmission output speed, the computer control unit including a control logic for operating the brake mechanism, the control logic requiring the engine speed being above a pre-set minimum engine speed and the transmission output speed being below a pre-set maximum transmission output speed before allowing the dual function device to engage the brake mechanism.

13. The method of engaging a brake mechanism as claimed in claim 12 , further comprising the step of operating a brake actuator to engage the said brake mechanism or another brake mechanism before activating the dual function device.

14. The method of engaging a brake mechanism as claimed in claim 12 , in which the dual function device is a switch activated by a user manually articulating the switch to an on position.

15. The method of engaging a brake mechanism as claimed in claim 14 , in which the brake mechanism is engaged after the switch is articulated to the on position to activate the dual function device for a minimum pre-set period.

16. The method of engaging a brake mechanism as claimed in claim 12 , in which the dual function device is a switch de-activated by a user manually articulating the switch to an off position.

17. The method of engaging a brake mechanism as claimed in claim 16 , in which the dual function device is de-activated after the switch is articulated to the off position for a minimum pre-set period.

18. The method of engaging a brake mechanism as claimed in claim 15 , in which the minimum pre-set period is 0.5 seconds.

19. The method of engaging a brake mechanism as claimed in claim 12 , in which, when the transmission system is in neutral mode, the dual function device is only activatable after the said brake mechanism, or another brake mechanism, has been engaged manually.

20. The method of engaging a brake mechanism as claimed in claim 12 , in which the dual function device is de-activated when a mode of the transmission system is changed from a neutral mode to a drive mode.

21. The method of engaging a brake mechanism as claimed in claim 12 , in which the vehicle has an engine and the dual function device is only activatable when the engine pre-set minimum speed being 500 rpm for the pre-determined time of 2 seconds and the transmission pre-set maximum output speed being 30 rpm is detected by the computer control unit.

22. The method of engaging a brake mechanism as claimed in claim 12 , in which the vehicle has an engine and the dual function device is de-activated when the engine is switched off.

Assignees

• Caterpillar Sarl

Inventors

• Chapman John
• Thompson David
• Ellis Andrew Colin
• Pollock Anthony James
• Tansley Roger William
• Tarelli James
• Taylor Neil
• Roberts Samuel Alec

Classifications

• B60T11/103

  in combination with other control devices (conjoint control of brake system and at least another sub-unit B60W10/188) · CPC title

• B60T7/12

  for automatic initiation; for initiation not subject to will of driver or passenger {(limiting speed of vehicles other than rail vehicles B60K31/00)} · CPC title

• F16H61/16

  Inhibiting  {or initiating}  shift during unfavourable conditions  {, e.g. preventing forward-reverse shift at high vehicle speed, preventing engine overspeed}   (F16H61/18 takes precedence) · CPC title

• F16H63/486 Primary

  Common control of parking locks or brakes in the transmission and other parking brakes, e.g. wheel brakes · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title