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Electronic Transfer Case for 1990 Aerostar Electronic Four Wheel Drive
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English
Abstract
A transfer case was designed to utilize electronic control. It has a planetary interaxle differential for proportional torque split. An electromagnetic clutch is applied across the differential to enhance mobility when road coefficients allow single wheel or single axle traction loss. The need for clutch actuation is monitored by an electronic module and sensor system, that detects abnormal amounts of differentiation in the interaxle unit. Clutch actuation is signaled and controlled by the module, which is also electrically connected to the rear axle ABS brake system to eliminate any possible simultaneous function compatibility issues.
System emphasis is on foul weather mobility when negotiating highway and secondary roads. The family vehicle market was targeted and performance parameters were adjusted toward mobility and driver confidence to complete a given trip.
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Citation
Richardson, J. and Dick, W., "Electronic Transfer Case for 1990 Aerostar Electronic Four Wheel Drive," SAE Technical Paper 892538, 1989, https://doi.org/10.4271/892538.Also In
Dynamic Characteristics of TodayS Passenger Car Transmissions
Number: SP-0837; Published: 1990-09-01
Number: SP-0837; Published: 1990-09-01
References
- Katsuya M. Isao Y. Tomohiro F. ”Four Wheel Anti-Lock Brake System (ABS) for Four-Wheel Drive Vehicles”, ABS Traction Control , SAE Paper 880322 1988
- Sturm R. “Brakes and ABS on Four Wheel Drive Vehicles”, ABS Traction Control , SAE Paper 880321 1988
- Anderson Scott “Impact of All Wheel Drive Systems on Braking Stability”, SAE Paper 890525 1989
- Hermanns Martin J. “Front Drive Systems for Four Wheel Drive Light Trucks”, SAE Paper 79001, sp-437 1979