IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0676018
(2007-02-16)
|
등록번호 |
US-7533754
(2009-07-01)
|
우선권정보 |
GB-0603452.4(2006-02-22) |
발명자
/ 주소 |
- Burrows, Andrew
- Barlow, Rob
|
출원인 / 주소 |
- Ford Global Technologies, LLC
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
36 인용 특허 :
4 |
초록
▼
A hybrid motor vehicle (10) has a four wheel drive arrangement in which the front wheels (12 and 13) are driven by the engine (11) in two wheel drive mode and all four wheels (12-15) in four wheel drive mode. The engine is connected to the rear wheels (14 and 15) through an auxiliary driveline which
A hybrid motor vehicle (10) has a four wheel drive arrangement in which the front wheels (12 and 13) are driven by the engine (11) in two wheel drive mode and all four wheels (12-15) in four wheel drive mode. The engine is connected to the rear wheels (14 and 15) through an auxiliary driveline which includes a first clutch (22) to connect to the engine (11), a propshaft (23) and a differential (25). An electric motor (28) is connected to the propshaft (23) for the purpose of driving the vehicle either with or without the assistance of the engine (11). A second clutch (27) is located between the propshaft (23) and the differential (25). When the vehicle is in two wheel drive mode, the propshaft (23) is disconnected from both the engine (11) and the rear wheels (14 and 15) and on switching to four wheel drive mode when the vehicle is moving the propshaft (23) is firstly spun up to a speed matching that of the engine (11) and rear wheels (14, 15) by the action of the electric motor (28). Then the auxiliary driveline (21) is reconnected by engaging the first and second clutches (22, 27). This reduces any acceleration jerk perceived by the driver.
대표청구항
▼
We claim: 1. A motor vehicle having an engine, two pairs of wheels, a driveline to connect the engine to the wheels such that one pair of wheels is driven by the vehicle engine when the vehicle is in a two wheel drive mode and the other pair of wheels is additionally connected to the engine when th
We claim: 1. A motor vehicle having an engine, two pairs of wheels, a driveline to connect the engine to the wheels such that one pair of wheels is driven by the vehicle engine when the vehicle is in a two wheel drive mode and the other pair of wheels is additionally connected to the engine when the vehicle is in a four wheel drive mode, the driveline including an auxiliary driveline which includes a first clutch means to connect to the engine, a differential downstream of the first clutch means, a propshaft connected between the first clutch means and the differential, and releasable torque transmitting means operable to connect and disconnect drive from the propshaft to said other pair of wheels, the vehicle further including an electric motor coupled to the auxiliary driveline, and control means operable to switch the vehicle between the four wheel drive and the two wheel drive modes such that in the two wheel drive mode the propshaft is disconnected from both the engine and said other pair of wheels and when switching the vehicle from the two wheel drive mode to the four wheel drive mode while the vehicle is moving the control means firstly activates the electric motor causing it to spin the propshaft up to a predetermined speed, and subsequently operates the first clutch means and the releasable torque transmitting means to connect the auxiliary driveline to the engine and to said other pair of wheels. 2. A motor vehicle as claimed in claim 1, wherein the first clutch means comprises a wet clutch. 3. A motor vehicle as claimed in claim 1, wherein the releasable torque transmitting means comprises second clutch means located between the differential and the second pair of wheels. 4. A motor vehicle as claimed in claim 1, wherein the releasable torque transmitting means is incorporated within the differential. 5. A motor vehicle as claimed in claim 4, wherein the differential comprises a free running differential. 6. A motor vehicle as claimed in claim 1, wherein the releasable torque transmitting means comprises a second clutch located between the propshaft and the differential. 7. A motor vehicle as claimed in claim 1, wherein the control means further includes a driver operable switch which allows the driver to select a desired drive mode from the two wheel drive mode and the four wheel drive mode. 8. A motor vehicle as claimed in claim 1, in which the control means is configured to receive signals indicative of vehicle operating conditions and is operable to switch from the two wheel drive mode to the four wheel drive mode when various vehicle operating parameters have been detected. 9. A motor vehicle as claimed in claim 1, wherein the control means is configured to compute the predetermined speed from measurements provided by an on-board wheel sensor. 10. A motor vehicle as claimed in claim 1, wherein the engine, on receiving a signal from the control means, is configured to increase its torque output to match the torque absorbed by the auxiliary driveline on reconnection thereof. 11. A motor vehicle as claimed in claim 1, wherein the electric motor is coupled to the propshaft via a coupling arrangement which includes an epicyclic gearing system. 12. A motor vehicle as claimed in claim 11, wherein the coupling arrangement includes a clutch mechanism. 13. A motor vehicle as claimed in claim 1, wherein the differential incorporates a crown wheel and the electric motor is connected to said crown wheel. 14. A motor vehicle as claimed in claim 13, in which the electric motor is connected to the crown wheel via a clutch arrangement. 15. A method of controlling a change in the transmission of torque from a motor vehicle engine to the driving wheels in a motor vehicle having a driveline and two pairs of wheels, one pair of wheels being driven by the engine when the vehicle is in a two wheel drive mode and the other pair of wheels being additionally connected to the engine when the vehicle is in a four wheel drive mode, the driveline including an auxiliary driveline and an electric motor coupled thereto, the auxiliary driveline including a first clutch means to connect to the engine, a differential downstream of the first clutch means, releasable torque transmitting means operable to connect and disconnect the drive from the differential to said other pair of wheels, and a propshaft connected between the first clutch means and the differential, wherein the propshaft is disconnected from both the engine and said other wheels when the vehicle is in two wheel drive mode and, on switching the vehicle from two wheel drive mode to the four wheel drive mode while the vehicle is moving, the electric motor rotates the propshaft until a predetermined rotational speed is reached, whereupon the auxiliary driveline is reconnected to the engine and to said other pair of wheels. 16. A driveline system for a motor vehicle having an engine and two pairs of wheels, the system comprising: a driveline to connect the engine to the wheels such that one pair of wheels is driven by the vehicle engine when the vehicle is in a two wheel drive mode and wherein the other pair of wheels is additionally connected to the engine when the vehicle is in a four wheel drive mode, an auxiliary driveline which includes a first clutch to connect to the engine, a differential downstream of the first clutch, a propshaft connected between the first clutch and the differential, and a second clutch operable to connect and disconnect the propshaft to said other pair of wheels, an electric motor coupled to the auxiliary driveline, and a controller operable to switch the vehicle between the four wheel drive mode and the two wheel drive mode such that in the two wheel drive mode the propshaft is disconnected from both the engine and said other pair of wheels and when switching the vehicle from the two wheel drive mode to the four wheel drive mode while the vehicle is moving the electric motor is activated to spin the propshaft to a predetermined speed, and subsequently said controller operates the first clutch and the second clutch to connect the auxiliary driveline to the engine and to said other pair of wheels. 17. A motor vehicle as claimed in claim 16, wherein the first clutch comprises a wet clutch. 18. A motor vehicle as claimed in claim 16, wherein the second clutch is incorporated within the differential. 19. A motor vehicle as claimed in claim 16, wherein the differential comprises a free running differential. 20. A motor vehicle as claimed in claim 16, wherein the controller further includes a driver operable switch which allows the driver to select a desired drive mode from the two wheel drive mode and the four wheel drive mode. 21. A motor vehicle as claimed in claim 16, in which the controller is configured to receive signals indicative of vehicle operating conditions and is operable to switch from the two wheel drive mode to the four wheel drive mode when various vehicle operating parameters have been detected. 22. A motor vehicle as claimed in claim 16, wherein the controller is configured to compute the predetermined speed from measurements provided by an on-board wheel sensor. 23. A motor vehicle as claimed in claim 16, wherein the engine, on receiving a signal from the controller, is configured to increase its torque output to match the torque absorbed by the auxiliary driveline on reconnection thereof. 24. A motor vehicle as claimed in claim 16, wherein the electric motor is coupled to the propshaft via a coupling arrangement which includes an epicyclic gearing system. 25. A motor vehicle as claimed in claim 24, wherein the coupling arrangement includes a clutch mechanism. 26. A motor vehicle as claimed in claim 16, wherein the differential incorporates a crown wheel and the electric motor is connected to said crown wheel. 27. A motor vehicle as claimed in claim 26, in which the electric motor is connected to the crown wheel via a clutch arrangement.
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