| 摘要 |
A method and system 10 for controlling a transfer case 32 of a four-wheel drive vehicle 12. The vehicle 12 includes a front driveshaft 22 and a rear driveshaft 26. Transfer case control system 10 includes a conventional microcontroller or controller 40 having a memory unit 42 and operating under stored program control. Controller 40 is communicatively coupled to sensors 44, 46, 47, to a driver-operated control 48, and to a transfer case clutch 38. Controller 40 operates transfer case 32 in several modes including an automatic four-wheel drive mode and a "locked" four-wheel drive high mode. Controller 40 estimates the amount of heat generated by clutch 38 by monitoring the difference in the speed between driveshafts 22 and 26 and by monitoring the position of the vehicle's throttle. Controller 40 automatically shifts from the automatic four-wheel drive mode to the locked four-wheel drive high mode when the estimated amount of heat exceeds a certain threshold level.
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