Vehicle control system

Abstract

To provide a control device of a vehicle which can improve ride comfort of the vehicle.SOLUTION: In a control device 20 of four-wheel drive vehicle 1 with front and rear wheels driven independently, a calculation part calculates prediction time until the rear wheels (left rear wheel 14rl, right rear wheel 14rr) shift from a low μ road to a high μ road after the front wheels shift from the low μ road to the high μ road when the front wheels (left front wheel 14fl, right front wheel 14fr) shift from the low μ road to the high μ road during acceleration of the vehicle 1. A drive control part reduces rear wheel drive force before the prediction time passes after the front wheels shift from the low μ road to the high μ road.SELECTED DRAWING: Figure 1

Claims

1. A control device for a four-wheel drive vehicle in which the front wheels and rear wheels are driven independently, When the front wheels move from a low-μ surface to a high-μ surface while the vehicle is accelerating, a calculation unit calculates the predicted time from when the front wheels move from the low-μ surface to the high-μ surface until the rear wheels move from the low-μ surface to the high-μ surface. A drive control unit that reduces the rear wheel driving force before the predicted time elapses after the front wheel moves from a low-μ surface to a high-μ surface, Equipped with, The drive control unit reduces the rear wheel driving force when a first time has elapsed, which is the predicted time minus a predetermined time, after the front wheels have moved from a low-μ surface to a high-μ surface. A vehicle control device characterized by the following features.

2. The drive control unit controls the rear wheel driving force according to the accelerator opening ratio of the vehicle until the first time has elapsed, and after the first time has elapsed, controls the rear wheel driving force according to the amount of rear wheel slip. The vehicle control device according to feature 1.

3. The drive control unit controls the rear wheel driving force according to the accelerator opening ratio when a second time has elapsed, which is the predicted time plus a predetermined time, after the front wheel has moved from a low-μ surface to a high-μ surface. The vehicle control device according to feature 2.

4. The transition of the front wheel from a low-friction surface to a high-friction surface corresponds to a change in the state during the vehicle's acceleration from a state where the slip of the front wheel subsided. The vehicle control device according to feature 1.

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