IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0414803
(2009-03-31)
|
등록번호 |
US-8459394
(2013-06-11)
|
발명자
/ 주소 |
- Storer, Corwin E.
- Carlton, Douglas J.
- Weier, Todd M.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
4 |
초록
▼
A rear wheel drive assist for an articulated machine such as a wheel tractor scraper, the machine including a first frame section having a first longitudinal axis, a second frame section with a second longitudinal axis, the first and second frame sections being pivotally connected to an articulation
A rear wheel drive assist for an articulated machine such as a wheel tractor scraper, the machine including a first frame section having a first longitudinal axis, a second frame section with a second longitudinal axis, the first and second frame sections being pivotally connected to an articulation hitch, and an articulation sensor configured to provide an articulation angle signal indicative of an articulation angle formed between the first and second longitudinal axes. The rear wheel drive assist includes a drive motor operatively connected to the rear wheel of the machine, and a controller configured to control operation of the rear wheel drive assist based upon the articulation angle signal.
대표청구항
▼
1. An articulated machine, comprising: a first frame section having a power source drivingly connected to at least one front wheel, the first frame section further having a first longitudinal axis;a first wheel sensor configured to provide an indication of a front wheel speed;a second frame section
1. An articulated machine, comprising: a first frame section having a power source drivingly connected to at least one front wheel, the first frame section further having a first longitudinal axis;a first wheel sensor configured to provide an indication of a front wheel speed;a second frame section having at least one rear wheel and a second longitudinal axis, the first and second frame sections pivotally connected at an articulation hitch;an articulation sensor configured to provide an articulation signal indicative of an articulation angle between first and second longitudinal axes; anda rear wheel drive assist providing a power output to the at least one rear wheel, comprising: at least one drive motor operatively connected to the at least one rear wheel; anda controller communicatively coupled to the first wheel sensor and the articulation sensor and configured to: determine a desired rear wheel speed based on the articulation signal, the desired rear wheel speed being less than the front wheel speed; andmodulate the power output to the at least one rear wheel based upon the desired rear wheel speed. 2. The articulated machine of claim 1, further including opposed first and second linear actuators connected between the first frame section and the second frame section and configured to move the first frame section relative to the second frame section about the articulation hitch. 3. The articulated machine of claim 2, wherein the articulation sensor is a linear sensor associated with the first or second actuators. 4. The articulated machine of claim 1, wherein the articulation sensor is a rotary sensor associated with the articulation hitch. 5. The articulated machine of claim 1, in which the drive motor is powered by a fluid pump, in which the controller is operably coupled to the drive motor and the fluid pump, and in which the controller modulates the power output to the at least one rear wheel by controlling at least one of the pump or the drive motor. 6. The articulated machine of claim 1, further including: a work tool pump fluidly connected to a fluid operated work tool motor operatively connected to power a work tool, the rear wheel drive assist further including a diverter valve having at least a first position at which fluid flow is delivered from the work tool pump to the work tool motor and a second position at which fluid flow is diverted from the work tool pump to the drive motor, wherein the controller is operatively coupled to the diverter valve and is further configured to deliver a diverter control signal to move the diverter valve between the first position and the second position. 7. The articulated machine of claim 6, wherein the controller modulates the power output to the at least one rear wheel by controlling at least one of a position of the diverter valve, a clutch between the drive motor and the at least one rear wheel, the work tool pump, the drive motor, or a brake associated with the at least one rear wheel. 8. The articulated machine of claim 1, in which the controller is further configured to receive a machine speed signal indicative of a machine travel speed, and in which the controller determines the desired rear wheel speed based on both the articulation signal and machine speed signal. 9. The articulated machine of claim 8, wherein the machine speed signal is at least one of a transmission output speed signal or a front wheel speed signal. 10. The articulated machine of claim 8, wherein the controller reduces the power output to the at least one rear wheel in response to an increasing articulation angle and an increasing machine speed. 11. The articulated machine of claim 10, wherein the indication of front wheel speed is provided by at least one of a front wheel speed sensor or a transmission output speed sensor. 12. The articulated machine of claim 1, wherein the controller is configured to receive an indication of front wheel speed and rear wheel speed, and to reduce the rear wheel speed relative to the front wheel speed as the articulation angle increases. 13. An articulated machine, comprising: a first frame section having a power source drivingly connected to at least one front wheel, the first frame section further having a first longitudinal axis;a second frame section having at least one rear wheel and a second longitudinal axis, the first and second frame sections pivotally connected at an articulation hitch;an articulation sensor configured to provide an articulation signal indicative of an articulation angle between first and second longitudinal axes;a first speed sensor configured to provide an indication of a front wheel speed;a second speed sensor configured to provide an indication of a rear wheel speed; anda rear wheel drive assist providing a power output to the at least one rear wheel, comprising: at least one drive motor operatively connected to the at least one rear wheel; anda controller communicatively coupled to the first wheel sensor and the articulation sensor and configured to: determine a desired rear wheel speed based on the articulation signal, the desired rear wheel speed being less than the front wheel speed; andmodulate the power output to the at least one rear wheel by reducing the rear wheel speed relative to the front wheel speed based on the desired rear wheel speed. 14. The articulated machine of claim 13, wherein the controller is provided with a first articulation angle range over which the rear wheel speed relative to the front wheel speed is not altered based on articulation angle. 15. The articulated machine of claim 14, wherein the first articulation angle range is between an articulation angle of zero and a desired articulation angle. 16. The articulated machine of claim 13, further including a machine speed sensor configured to provide an indication of machine travel speed, in which the controller determines the desired rear wheel speed based upon a combination of articulation angle and machine travel speed. 17. The wheel tractor scraper of claim 13, wherein the controller is configured to calculate the articulation angle based on the articulation angle signal, and to compare the calculated articulation angle to a set of articulation angle values with corresponding rear wheel speed reduction factors. 18. A wheel tractor scraper, comprising: a tractor portion having a power source drivingly connected to at least one front wheel, the tractor portion having a first longitudinal axis;a scraper portion pivotally connected to the tractor portion at an articulation hitch, the scraper portion having a second longitudinal axis, a bowl and at least one rear wheel;first and second linear actuators connected between the tractor portion and the scraper portion in opposed position, the first and second actuators configured to move the tractor portion relative to the scraper portion about the articulation hitch;an articulation sensor configured to provide an articulation signal indicative of an articulation angle between the first and second longitudinal axes;a first speed sensor configured to provide an indication of a front wheel speed;a second speed sensor configured to provide an indication of a rear wheel speed; anda hydraulic rear wheel drive assist providing a power output to the at least one rear wheel, comprising: a fluid pump fluidly connected to at least one fluid drive motor, the fluid drive motor operatively connected to the at least one rear wheel; anda controller communicatively coupled to the first wheel sensor and the articulation sensor and configured to: determine a desired rear wheel speed based on the articulation signal, the desired rear wheel speed being less than the front wheel speed; andmodulate the power output to the at least one rear wheel by reducing the rear wheel speed relative to the front wheel speed based on the desired rear wheel speed. 19. The wheel tractor scraper of claim 18, wherein the first speed sensor is configured to monitor a transmission output speed, a transmission output speed ratio, an axle speed, or a wheel speed to provide an indication of a front wheel speed. 20. The wheel tractor scraper of claim 18, wherein the controller modulates the power output to the at least one rear wheel by controlling at least one of the fluid pump or the drive motor.
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