Motor vehicles – Having four wheels driven – With differential means for driving two wheel sets at...
Patent
1987-01-12
1987-10-13
Pekar, John A.
Motor vehicles
Having four wheels driven
With differential means for driving two wheel sets at...
3644241, B60K 1734
Patent
active
046992367
ABSTRACT:
In a four wheel drive power transmission system for a vehicle, a power distribution device receives power from an engine and provides rotational power to the combination of the front wheels and also to the combination of the rear wheels, and is controllable either to provide differential action between the front wheels combination and the rear wheels combination, or for this differential action to be at least partially inhibited. This slippage control device includes: a subsystem which detects occurrence of certain speed shift circumstances of the transmission mechanism; and a subsystem which controls the power distribution device to at least partly inhibit its differential function, if the speed shift circumstances detection subsystem determines that the transmission mechanism is in fact undergoing the speed shift circumstances. The method of operation of this device is also described. The control of the power distribution device may be according to elapsed time from the time point of outputting of a speed shift command signal to the transmission mechanism, and may be based upon type of speed shift, or based upon load on the vehicle engine, or based upon the manually set operating range for the transmission mechanism, if it is an automatic transmission mechanism. Typically, the speed shift circumstances are speed down shift circumstances, quite usually circumstances of speed down shift to the first speed stage of the transmission mechanism, such as may accompanying a manual change of operational range of the transmission mechanism such as from "D" range to "L" range. The inhibition of differential action may be only performed if vehicle road speed is higher than a determinate value, or vehicle turning angle is lower than a determinate value, or both. The invention is particularly useful when the power distribution device for four wheel drive is of a type which, when thus being controlled to provide differential action, distributes drive torque substantially unequally between the front wheels combination and the rear wheels combination.
REFERENCES:
patent: 4558414 (1985-12-01), Sakakiyama
Morisawa Kunio
Nakamura Yasunari
Pekar John A.
Toyota Jidosha & Kabushiki Kaisha
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