Motor vehicle transfer case

Details Motor vehicle transfer case Motor vehicle transfer case

1997-03-10

1999-12-14

Swann, J. J.

Motor vehicles

Having four wheels driven

With differential means for driving two wheel sets at...

180197, B60K 17348

Patent

active

060004886

ABSTRACT:
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 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 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 shafts overruns, i.e., exceeds, the speed of the other drive shaft by a predetermined value related to the vehicle speed, indicating that wheel slip is present, clutch current is incrementally increased to increase clutch engagement and torque transfer to the secondary axle. When wheel slip is reduced below the predetermined value the current to the clutch is incrementally reduced. The method of operating such a system is also described.

REFERENCES:
patent: 3158243 (1964-11-01), Croft et al.
patent: 4352415 (1982-10-01), Powell
patent: 4417641 (1983-11-01), Kageyama
patent: 4436193 (1984-03-01), Smirl
patent: 4550817 (1985-11-01), Euler
patent: 4597467 (1986-07-01), Stockton
patent: 4718303 (1988-01-01), Fogelberg
patent: 4754834 (1988-07-01), Ozaki et al.
patent: 4757870 (1988-07-01), Torii et al.
patent: 4773500 (1988-09-01), Naito et al.
patent: 4776424 (1988-10-01), Naito
patent: 4840247 (1989-06-01), Kashihara et al.
patent: 4846298 (1989-07-01), Naito
patent: 4860612 (1989-08-01), Dick et al.
patent: 4866624 (1989-09-01), Nishikawa et al.
patent: 4874056 (1989-10-01), Naito
patent: 4878399 (1989-11-01), Kameda
patent: 4887689 (1989-12-01), Naito
patent: 4899859 (1990-02-01), Teraoka
patent: 4937750 (1990-06-01), Gilliam
patent: 4949594 (1990-08-01), Galhotra
patent: 4986388 (1991-01-01), Matsuda
patent: 4989686 (1991-02-01), Miller et al.
patent: 4991678 (1991-02-01), Furuya et al.
patent: 5002147 (1991-03-01), Tezuka et al.
patent: 5010974 (1991-04-01), Matsuda
patent: 5060747 (1991-10-01), Eto
patent: 5090510 (1992-02-01), Watanabe et al.
patent: 5092188 (1992-03-01), Fujikawa et al.
patent: 5098352 (1992-03-01), Montanaro et al.
patent: 5105902 (1992-04-01), Wilson et al.
patent: 5119900 (1992-06-01), Watanabe et al.
patent: 5141072 (1992-08-01), Shibahata
patent: 5172798 (1992-12-01), Mabee
patent: 5199325 (1993-04-01), Reuter et al.
patent: 5215160 (1993-06-01), Williams et al.
patent: 5249849 (1993-10-01), Sakata
patent: 5346032 (1994-09-01), Sasaki
Nissan Motor Company, Ltd., "Nissan Electronic Torque Split 4WD System", pp. 1-20.
Technical paper (Reference No. 891074) on "NIssan ETS" system described in the above-referenced Nissan publication. This paper is in Japanese.
Advertising brochures by Fuji Tekko Co., LTD., which advertises the system described in the above-referenced Nissan publication. Fuji Tekko manufactures the transfer case for Nissan. Both Japanese and English versions are attached.
SAE Technical Paper No. 950354, A Computer Controlled Transfer for Four-Wheel Drive Vehicles by Moroto, Kobayashi, Hayakawa and Kubo, 1985.

Affiliated with

Also associated with

Rating

Motor vehicle transfer case does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor vehicle transfer case, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor vehicle transfer case will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-855132