Traction lock/momentary override

• US 6,189,646 B1
• Filed: 11/30/1998
• Issued: 02/20/2001
• Est. Priority Date: 11/30/1998
• Status: Expired due to Term

• Current Assignee: Clark Equipment Company (Doosan Enerbility Company Limited)
• Original Assignee: Clark Equipment Company (Doosan Enerbility Company Limited)
• Inventors: Jacobson, Scott B., Brandt, Kenneth A.
• Primary Examiner(s): Johnson, Brian L.
• Assistant Examiner(s): DRAPER, DEANN L
• Application Number:
  US09/203,192
• Time in Patent Office: 813 Days
• Field of Search: 180/272, 180/273, 180/271, 180/269, 340/540, 340/541
• US Class Current: 180/273
• CPC Class Codes: B60K 28/04 responsive to presence or absence of the driver, e.g. to weight or lack thereof
• CPC Class Codes: B60R 21/02 Occupant safety arrangements or fittings , e.g. crash pads seat belts with crash pads B60R22/14; removable children's seats having a front guard or barrier B60N2/2839
• CPC Class Codes: E02F 9/226 Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
• CPC Class Codes: E02F 9/24 Safety devices , e.g. for preventing overload E02F9/226 takes precedence

Abstract

A control system on a power machine which includes a first sensor sensing a first operating condition and providing a first sensor signal. An operator actuable override mechanism provides an override signal in response to actuation thereof. A controller is coupled to the first sensor, a power circuit, a traction lockout mechanism, and the override mechanism. The controller is configured to instate a lockout condition in response to the first sensor signal. The controller selectively overrides the lockout condition based on the override signal, and the first sensor signal.

Claims

1. A power machine including a traction mechanism for driving the power machine, and a power actuator, comprising:

a first sensor sensing a first operating condition and providing a first sensor signal indicative of the first operating condition;

a traction lockout mechanism coupled to the traction mechanism to selectively lock the traction mechanism;

an operator actuable override mechanism providing an override signal in response to actuation thereof;

a power circuit coupled to the traction mechanism and the power actuator to provide power to the traction mechanism and the power actuator; and

a controller coupled to the first sensor, the power circuit, the traction lockout mechanism, and the override mechanism and configured to instate a first lockout condition in which a plurality of functions are locked out in response to the first sensor signal and to selectively override the first lockout condition based on the override signal, and the first sensor signal.

2. The power machine of claim 1 wherein the power machine includes:

a movable element, movable between a first position proximate a seat and a second position wherein the movable element is disposed further from the seat in the second position than in the first position, and wherein the first sensor provides the first sensor signal indicative of the position of the movable element.

3. The power machine of claim 2 wherein the controller instates a traction lockout condition in response to the movable element being in the second position.

4. The power machine of claim 3 wherein the controller overrides the traction lockout condition in response to the override signal when the movable element is in the second position.

5. The power machine of claim 4 wherein the controller reinstates the traction lockout condition in response to a next subsequent override signal.

6. The power machine of claim 5 wherein the controller overrides the traction lockout condition in response to the override signal when the movable element is in the second position and reinstates the traction lockout condition when the movable element is subsequently moved to the first position.

7. The power machine of claim 6 wherein the movable element comprises a seat bar.

8. The power machine of claim 2 wherein, upon power up, a plurality of functions of the power machine are locked out and a traction lockout condition is instated, and wherein the controller is configured to unlock the functions in response to the movable element being in the first position and in response to the override signal.

9. The power machine of claim 8 wherein the controller is configured to re-instate the traction lockout condition and to lockout the plurality of functions in response to the movable element being moved to the second position.

10. A control component in a power machine including a traction mechanism for driving the power machine, and a power actuator, the control component comprising:

a first sensor sensing a first operating condition and providing a first sensor signal indicative of the first operating condition;

a traction lockout mechanism coupled to the traction mechanism to selectively lock the traction mechanism;

an operator actuable override mechanism providing an override signal in response to actuation thereof;

a power circuit coupled to the traction mechanism and the power actuator to provide power to the traction mechanism and the power actuator; and

a controller coupled to the first sensor, the power circuit, the traction lockout mechanism, and the override mechanism and configured to instate a first lockout condition in which a plurality of functions are locked out in response to the first sensor signal and to selectively override the first lockout condition based on the override signal, and the first sensor signals.

11. The control component of claim 10 wherein power machine includes a movable element, movable between a first position proximate the seat and a second position wherein the movable element is disposed further from the seat than in the first position, and wherein the first sensor provides the first sensor signal indicative of the position of the movable element.

12. The control component of claim 11 wherein the controller instates a lockout condition, upon power up, in which traction and certain power actuator functions are locked out and wherein the controller is configured to override the lockout condition in response to the override signal when the movable element is in the first position.

13. The control component of claim 12 wherein the controller is configured to override the lockout condition in response to the override signal when the movable element is in the first position and to reinstate the lockout condition when the movable element is moved to the second position.

14. The control component of claim 12 wherein the controller is configured to override lockout of the traction function in response to the override signal when the movable element is in the second position.

15. The control component of claim 14 wherein, when the movable element is in the second position, the controller overrides lockout of the traction function in response to the override signal and reinstates lockout of the traction function in response to a subsequent actuation of the override mechanism.

16. The control component of claim 14 wherein the controller overrides lockout of the traction function in response to the override signal when the movable element is in the second position and reinstates lockout of the traction function when the movable element is subsequently moved to the first position.

17. A skid steer loader having a frame, the skid steer loader comprising:

a traction mechanism, coupled to the frame, driving the skid steer loader;

a traction lock mechanism selectively coupleable to the traction mechanism to lock the traction mechanism;

a seat coupled to the frame;

a seat bar movable between a first position proximate the seat and a second position located further from the seat than when in the first position;

a seat bar sensor providing a seat bar signal indicative of the position of the seat bar;

a power actuator coupled to the frame;

a power circuit providing power to the power actuator;

an operator actuable override mechanism providing an override signal in response to actuation thereof; and

a controller coupled to the traction lock mechanism, the seat bar sensor, the power circuit and the override mechanism;

wherein the controller controls the power circuit and the traction lock mechanism to enter a traction lockout condition locking the traction mechanism in response to the seat bar signal indicating that the seat bar is in the second position;

wherein the controller overrides the traction lockout condition in response to the override signal based on the seat bar signal;

wherein, upon power up, a plurality of functions of the power machine are locked out; and

wherein the controller is configured to unlock the functions in response to the movable element being in the first position and in response to the override signal.

18. The skid steer loader of claim 17 wherein the controller overrides the traction lockout condition in response to the override signal when the seat bar is in the second position.

19. The skid steer loader of claim 18 wherein, when the seat bar is in the second position, the controller overrides the traction lockout condition in response to the override signal and reinstates the traction lockout condition in response to a subsequent actuation of the override mechanism.

20. The skid steer loader of claim 19 wherein the controller overrides the traction lockout condition in response to the override signal when the seat bar is in the second position and reinstates the traction lockout condition when the seat bar is subsequently moved to the first position.

21. A power machine including a traction mechanism for driving the power machine, and a power actuator, comprising:

a movable element, movable between a first position proximate a seat and a second position wherein the movable element is disposed further from the seat in the second position a in the first position;

a sensing mechanism providing a signal indicative of the position of the movable element;

an actuable operation mechanism providing an operation signal upon actuation thereof;

a traction lock mechanism coupled to the traction mechanism to selectively lock the traction mechanism;

a power circuit coupled to the traction mechanism and the power actuator to provide power to the traction mechanism and the power actuator;

the power machine being configurable in a run condition wherein a plurality of functions are unlocked, and a locked condition wherein the plurality of functions are locked; and

a controller coupled to the sensing mechanism, the power circuit, the traction lock mechanism, and the operation mechanism and configured to change the condition of the power machine upon actuation of the operation mechanism depending upon the position of the movable element wherein, upon power up, the locked condition is instated and the controller changes the condition of the power machine to the run condition in response to the operation signal.