JPS6274712A - Control device for four-wheel-drive vehicle - Google Patents

Abstract

PURPOSE:To enable the driver to select a suitable mode in accordance with a situation, by providing a torque distribution adjusting device capable of being arbitrarily selected by the driver himself so that the result of the selection may be displayed, and by displaying the loads of tires after distribution of the selected torque. CONSTITUTION:A torque distribution adjusting means 21-1 for adjusting the distribution of power from an engine to front and rear wheels is arranged on an instrument panel in the vicinity of the driver's seat. Similarly, a four tire load distribution displaying means 10-1 and a front and rear wheel torque distribution displaying means 10-1 are arranged on the instrument panel in the vicinity of the driver's seat. When the above-mentioned adjusting means 21-1 is manipulated to set a desired value, a computer 20 converts the set value into a hydraulic pressure signal which controls a hydraulic control mechanism 4 for controlling the supply hydraulic pressure fed to a 2-4 wheel drive change- over section 11. Further, the loads of the four wheels are detected by a tire load sensor 21-2, and a detection signal from the sensor 12-1 is delivered to the above-mentioned displaying means 10-1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application)
The present invention relates to a control device that performs four-wheel drive selection switching and display.

(Prior Art) Conventional four-wheel drive vehicles, including two-wheel to four-wheel switching vehicles, distribute power from an engine to front wheels and rear wheels at a fixed ratio at a predetermined ratio. However, in order to take advantage of the characteristics of a four-wheel drive vehicle, the driving performance of a four-wheel drive vehicle varies depending on driving conditions such as deceleration and turning, as well as the number of passengers in the vehicle, the loading condition, etc., as well as climbing and acceleration.

(Problem to be solved by the invention) As mentioned above, although the driving performance of a four-wheel drive vehicle changes depending on the driving condition, the driver has not been able to understand the driving condition and drive the vehicle. Therefore, it was not possible to drive the vehicle in a way that suited the situation.

The present invention eliminates the above problems, displays the load distribution on the four wheels to the driver, allows the driver to select the torque distribution between the front and rear wheels, and allows the driver to drive according to the situation.・One-wheel drive vehicle The purpose is to provide a control device for

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a control device for a four-wheel drive vehicle equipped with a clutch for switching between two-wheel drive and four-wheel drive, which distributes torque between the front and rear wheels. a torque distribution adjustment means for setting, a front and rear wheel torque distribution display means for receiving and displaying an output signal of the torque distribution adjustment means, and a hydraulic pressure setting for outputting a hydraulic pressure setting signal based on the output signal of the torque distribution adjustment means. means, hydraulic control means for inputting the hydraulic pressure setting signal to adjust the engagement hydraulic pressure of the clutch, tire load detecting means for detecting tire loads on the four wheels, and receiving an output signal of the tire load detecting means. The present invention is characterized in that a load distribution display means for displaying load distribution is provided.

(Operations and Effects of the Invention) According to the present invention, the driver can arbitrarily select the torque distribution adjustment means, display the result, and display the load of each tire after the selected torque distribution. Therefore, the driver can select an appropriate driving mode according to the situation while grasping the driving condition.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram of a control device for a four-wheel drive vehicle according to the present invention,
Figure 2 is a layout diagram of torque distribution adjustment means, load distribution display means for four tires, and front and rear wheel torque distribution display means, Figure 3 is a diagram of the control device, and Figure 4 is an automatic transmission equipped with a center clutch. 5 is a sectional view of an automatic transmission equipped with the center differential lock clutch, and FIG. 6 is a sectional view of an automatic transmission equipped with a 2-wheel to 4-wheel switching clutch that partially engages the front wheels. It is a diagram.

As shown in FIGS. 1 to 3, torque distribution adjustment means 21-1 adjusts the power distribution from the engine to the front and rear wheels.
For example, the torque distribution adjustment dial 5 is placed on an instrument panel near the driver's seat. Similarly, the load distribution display means 10-1 for four tires, for example, the weight distribution display device 6 for each of the four wheels, and the front and rear wheel torque distribution display means 10-2, for example,
The power distribution display device 7 for the front and rear wheels is also placed on the instrument panel near the i'ilT transfer seat.

Therefore, when the torque distribution adjustment dial 5 is manually set to an arbitrary value, the set value is displayed on the power distribution display device 7 via the computer 20 as needed, and the computer 20 also controls the hydraulic pressure. converted into a signal. The oil pressure signal controls the oil pressure control mechanism 4 to
Controls the hydraulic pressure supplied to the wheel switching clutch. The load of the four tires in this control state is detected by the tire load sensor 21-2 of the input unit 21, and the detection signal is sent to the weight distribution display device 6 via the computer 20 as necessary.
Enter.

For reference, here is a typical example of the torque distribution ratio between front and rear wheels:
■For center clutch type 4-wheel drive systems without center differential, front wheel: rear wheel = 5o; 50-80: 2
0, ■ 50:50 for types with center differential (this applies to differential control devices from no differential lock to differential lock). ■Torque distribution type with center differential has a torque distribution of 20:80 to 80:20.

Next, the hydraulic pressure supplied from the hydraulic control mechanism 4 is input to the two-wheel-four-wheel drive switching section 11. In other words, it is supplied to various clutches of the automatic transmission.

Next, an automatic transmission equipped with a center clutch will be described with reference to the fourth recess.

The automatic transmission is composed of a fluid torque converter 17, a transmission 100, a four-wheel drive transfer mechanism 50, and a hydraulic control mechanism shown in FIG. has been done. The transmission 100 has a front planetary gear UDI and a rear planetary gear UDT.
and two multi-disc clutches C operated by hydraulic servos.
1 and C2, one band brake B7. two multi-) anti-brake B2 and B3. one one-way latch F
I, an underdrive transmission 200 with 3 forward speeds and 1 reverse speed with one one-way pull lever F2, a brane clutch gear U D s, and one anti-clutch C8 operated by a hydraulic servo; and a second underdrive transmission equipped with a square brake F3. 4
The wheel drive transfer mechanism 50 is composed of a front differential device 60, a center clutch (C/(:,), and a rear wheel propulsion mechanism 70. The center clutch 2 is a multi-plate wet clutch; Clutch is transfer case 3
Accumulator pressure is applied to the piston 33 through the oil passage 34 provided in the differential case 32 and the oil passage 38 provided in the differential case 32, and the differential case 32 screwed to the drive gear 31 and the rear It connects and disconnects from the wheel side output member 35.

Next, an automatic transmission equipped with a center clutch will be explained with reference to FIG.
1, and a hydraulic control mechanism shown in FIG.

The transmission 100 is a front planetary gear U
D, , rear planetary gear UD2 and 1, two multi-plate clutches c1 and Cz operated by heavy pressure servo,
One handbrake B8. Two multi-disc brakes B2.
One one-way latch F1. One one-way brake F2
Underdrive transmission 2 with 3 forward speeds and 1 reverse speed
00, a planetary gear UD3, and a second underdrive transmission equipped with one multi-disc clutch C1 and one multi-disc brake F, 3 operated by a crafted servo. The above points are similar to those in FIG.

Next, the four-wheel drive transfer mechanism 50 includes a front differential 60 and a center differential lock clutch (C/
D) 3 and a rear wheel propulsion mechanism 70. The center differential lock clutch 3 is a multi-plate wet clutch, and this clutch 3 is connected to an oil passage 3 provided in a transfer case 37.
4 and the accumulator pressure applied to the piston 33 through the oil passage 38 provided in the differential case 32, the differential l-s 32 screwed to the large drive gear 31 and the rear wheel side output member 35 are connect and disconnect.

Next, a control mechanism for switching between two wheels and four wheels in a part-time four-wheel drive vehicle in which the front wheels are partially coupled will be described with reference to FIG. 6.

The transfer 400, which is a control mechanism, mainly includes a front wheel transmission mechanism 500, a rear wheel propulsion mechanism 700, and a hydraulic clutch mechanism 600. The rotational force from the transmission is transmitted to the rear wheel propulsion mechanism 700 via the large drive gear 410, the differential case 4201, and the light case 424.

When the adjustment pressure from the hydraulic control mechanism 4 in FIG. The signal is transmitted to the front wheel transmission mechanism via the differential case 420 and the multi-plate clutch C4 of the hydraulic clutch mechanism 600.

As described above in detail, the present invention allows the driver to select any driving mode while looking at the display.

In addition, the clutch for switching between 2 wheels and 4 wheels can be mounted compactly without increasing the width of the vehicle.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a control device for a four-wheel drive vehicle according to the present invention,
Figure 2 is a layout diagram of the transformer distribution adjustment means, load distribution display means for the four tires, and front and rear wheel torque distribution display means, Figure 3 is a block diagram of the control device, and Figure 4 is an automatic transmission equipped with a center clutch. Figure 5 is a cross-sectional view of the automatic transmission equipped with a center differential lock clutch, Figure 6 is a cross-sectional view of the machine.
The figure is a sectional view of an automatic transmission equipped with a clutch for switching between two wheels and four wheels that partially engages the front wheels. 2... Center clutch, 3... Center differential lock clutch, 4... Hydraulic control mechanism, 5... Torque distribution adjustment dial, 6... Weight distribution display device, 7... Power distribution display device, DESCRIPTION OF SYMBOLS 10... Display part, 10-1... Load distribution display means, 10-2... Front and rear wheel torque distribution display means, 20... Computer, 21... Input part, 10
0...Transmission, 600...Hydraulic clutch mechanism.

Claims (3)

[Claims] (1) In a control device for a four-wheel drive vehicle equipped with a two-wheel-to-four-wheel drive switching clutch, there is provided a torque distribution adjusting means for distributing and adjusting front and rear wheel torque, and a torque distribution adjusting means for distributing and adjusting front and rear wheel torque; Front and rear wheel torque distribution display means for displaying torque distribution; hydraulic pressure setting means for outputting a hydraulic pressure setting signal based on the output signal of the torque distribution adjusting means; and inputting the hydraulic pressure setting signal to adjust the engagement hydraulic pressure of the clutch. The vehicle is characterized by being provided with hydraulic pressure control means for adjusting, tire load detection means for detecting the tire loads of the four wheels, and load distribution display means for receiving the output signal of the tire load detection means and displaying the load distribution. This is a control device for a four-wheel drive vehicle. (2) A control device for a four-wheel drive vehicle according to claim 1, wherein the torque distribution adjustment means, the torque distribution display means, and the load distribution display means are arranged in a driver's seat. . (3) The control device for a four-wheel drive vehicle according to claim 1, wherein the torque distribution display means and the load distribution display means are analog displays.