IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0172432
(1993-12-23)
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발명자
/ 주소 |
- McGinn Ward D. (Brighton MI) Perttola Todd L. (New Hudson MI) Watson Will (Southfield MI) Miller Alan L. (Ithaca NY) Sundquist Drew A. (Canton MI) Simpson Roger T. (Ithaca NY) Ducklow Diane K. (Farmi
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출원인 / 주소 |
- Borg-Warner Automotive, Inc. (Sterling Heights MI 02)
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인용정보 |
피인용 횟수 :
26 인용 특허 :
0 |
초록
▼
An on demand vehicle drive system monitors vehicle performance and operating conditions and controls torque delivery to the vehicle wheels. The system includes a plurality of speed and position sensors, a transfer case having primary and secondary output shafts driving primary and secondary drive sh
An on demand vehicle drive system monitors vehicle performance and operating conditions and controls torque delivery to the vehicle wheels. The system includes a plurality of speed and position sensors, a transfer case having primary and secondary output shafts driving primary and secondary drive shafts, differentials and axles and a microcontroller. The sensors include a vehicle speed sensor, a pair of primary and secondary drive shaft speed sensors, and brake and driveline status sensors. The transfer case includes a modulating electromagnetic clutch comprising a primary, cone clutch assembly which functions as a pilot device to actuate a secondary, disc pack clutch assembly. The electromagnetic clutch is controlled by the microcontroller which is incrementally engaged to transfer torque from the primary output shaft to the secondary output shaft. When the speed of either the front or the rear drive shaft overruns, i.e., exceeds, the speed of the other drive shaft by a predetermined value related to the vehicle speed and other variables, indicating that wheel slip is present, clutch current is incrementally increased to increase clutch engagement and torque transfer to the secondary drive shaft. When wheel slip is reduced below the predetermined value the current to the clutch is incrementally reduced. The system also senses and compensates for the speed differences between the primary and secondary drive axles caused by the use of different, mixed tire, sizes, e.g., a compact spare, at one or more tire locations by adjusting the predetermined value. The method of operating such a system is also described.
대표청구항
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An adaptive four-wheel vehicle drive system (10; 10′) comprising, in combination, a primary drive line (32,36,38;12′,14′,24′) having primary drive wheels (34; 22′), a secondary drive line (12,14,24;32′,36′,38′) having secondary drive wheels (22;34′), a transfer means (28) having a primary output (40
An adaptive four-wheel vehicle drive system (10; 10′) comprising, in combination, a primary drive line (32,36,38;12′,14′,24′) having primary drive wheels (34; 22′), a secondary drive line (12,14,24;32′,36′,38′) having secondary drive wheels (22;34′), a transfer means (28) having a primary output (40) adapted to drive said primary drive line (32,36,38;12′,14′,24′), a secondary output (26) adapted to drive said secondary drive line (12,14,24;32′,36′,37), modulating clutch means (124) including a primary, cone clutch (125) a secondary, disc pack clutch (150) and ramp means (130) acted on by said primary clutch (125) for compressing and actuating said secondary clutch (150) for transferring torque from said primary drive line (32,36,38;12′,14′,24′) to said secondary drive line (12,14,24;32′,36′,37), means (170;170′) for sensing the rotational speed of said primary drive line (32,36,38;12′,14′,24′), means (176;176′) for sensing the rotational speed of said secondary drive line (12,14,24;32′,36′,37), and microcontroller means (200) for comparing the speed of said primary drive line (32,36,38;12′,14′,24′) with the speed of said secondary drive line (12,14,24;32′,36′,37) and incrementally engaging said modulating clutch means (124) when the difference between said speeds is greater than a predetermined value.
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