JP2561088Y2 - Synchronous control device for dynamometer for four-wheel drive vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a four-wheel drive vehicle (4WD).
More particularly, the present invention relates to a four-wheel independent load section synchronous control device.

[0002]

2. Description of the Related Art A dynamometer for a four-wheel drive vehicle is shown in FIG.
As shown in FIG. 1, four rollers 1 to 4 on which the four wheels F _{1 to} F ₄ of the test vehicle are mounted have independent load portions 5 respectively.
８8 are combined. Each of the load units 5 to 8 uses a DC electric dynamometer (DCDY) or a flex dynamometer (FCDY), and performs constant speed control (A) according to the test purpose of the test vehicle.
SpR), constant torque control (ATR), running resistance control (A
LR) is selected.

As shown in FIG. 3, each load unit 5 to 8 is synchronized with one load unit 5 as a master, and the difference between the load unit 5 and each of the load units 6 to 8 is used as a correction value for each load unit. The command values of the units 6 to 8 are corrected. In the figure, a divider 9 performs 1/4 multiplication in order to equally divide the total running resistance command or the total torque command into four load units, and uses the calculation result as an ALR or ATR command of the load unit 5, Are added to or subtracted from correction values D ₂ , D ₃ , and D ₄ that detect the running resistance or torque output difference from the load unit 5 to the load units 6 to 8. Alternatively, the torque is controlled to the same value, that is, synchronous control is performed.
Each of the load units 5 to 8 is a current control system (AC
R) or a torque control system (ATR).

[0004]

[Devised Problems to be Solved] Since the conventional synchronous control correction value D ₂ to D ₄ are added to or subtracted running resistance command or the torque command of each load unit 6-8, the total torque of the load unit 5-8 Is different from the total running resistance command value or the torque command value, and there is a possibility that the test accuracy may be lowered.

[0005] An object of the present invention is to provide a synchronous control device that makes the total torque coincide with a command value while synchronizing each load section.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention synchronizes a plurality of load sections independently or partially coaxially with each wheel of a four-wheel drive vehicle and each load section. A dynamometer for a four-wheel drive vehicle having a control unit for controlling the running resistance or controlling the torque by means of the control unit, wherein the control unit performs a division for equally allocating all the running resistance commands or all the torque commands to each load unit. And an adder / subtractor 11 that corrects the output of the divider based on the difference between the detected torque of one load unit serving as a master and the detected torque of another load unit, and sets the output as a torque command for the other load unit. To 13 and an adder 18 for calculating the total value of the detected torques of the other load units, and subtracting the output of the adder from the total running resistance command or the total torque command to obtain a torque command for the master load unit. And a subtractor 10.

[0007]

According to the present invention having the above construction, the torque obtained by subtracting all the detected torques of the other load units except for the master load unit from the total running resistance command or the total torque command becomes the output torque of the master load unit. The output total torque of the load section matches the command value. Then, the output torque of the divider is corrected based on the difference between the detected torque of the master load unit and the detected torque of the other load units, and the load commands are synchronized so that the load units are synchronized.

[0008]

1 is a block diagram showing a synchronous control according to an embodiment of the present invention. The total running resistance command Lset is input to the divider 9 and input to the subtractor 10. Divider 9
1/4 output is the input of each of the subtracter 11 to 13, similar to the conventional correction value D ₂ to D ₄ is the running resistance command load section 6-8 is subtraction. These correction values D _{2 to} D ₄
Is a torque detector 14 for detecting the torque of each of the load portions 5 to 8
From the detection signal T _d1 through T _d4 of -17 it is obtained by computation according to _{D 2 = T d1 -T d2 D} 3 = T d1 -T d3 D 4 = T d1 -T d4.

The subtraction input D ₁ to the subtracter 10 is
, And the adder 18 includes the torque detectors 15 to 1
7, a total value D obtained by adding the detected torques T _d2 , T _d3 , and T _{d4.
Get as one} .

D ₁ = T _d2 + T _d3 + T _{d4 In} this embodiment having the above configuration, the total running resistance command value Ls
To a value obtained by subtracting the detected torque sum D ₁ of the load unit 6-8 from et a command value of the load unit 5, the total output torque of the load unit 5-8 always coincides with the command value Lset. Then, the torque commands of the load units 6 to 8 are corrected by the correction values D _{2 to} D ₄ , so that synchronous control that matches the output torque of the load unit 5 can be obtained.

In the case where torque control is performed on the load units 5 to 8 instead of the running resistance control, the same operation and effect can be obtained by replacing the entire running resistance command Lset with the whole torque command.

Further, in the embodiment, a case is shown in which a test vehicle is a four-wheel drive vehicle in which the torque loads of the four wheels are made independent. It is needless to say that the present invention can be applied to a dynamometer having a two-axis configuration in which a single roller and a load portion are used for each of the front and rear wheels.

[0013]

As described above, according to the present invention, according to the present invention, the total detected torque value of the other load units except for the master load unit is subtracted from the total running resistance command or the total torque command to obtain a master load unit torque command. Since the torque command assigned to other load units is corrected based on the detected torque difference from the master load unit, the total output torque of each load unit can always be made to match the command value while synchronizing each load unit. The test accuracy of a four-wheel drive vehicle can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a synchronous control according to an embodiment of the present invention;

FIG. 2 is a basic configuration diagram of a dynamometer for a four-wheel drive vehicle,

FIG. 3 is a conventional synchronous control block diagram.

[Explanation of symbols]

1,4 ... roller, 5,8 ... load section, 9 ... divider, 10 ...
Subtractors, 11, 12, 13: Addition / subtraction units, 14, 17: Torque detectors, 18: Adders.

Claims (1)

(57) [Scope of request for utility model registration] 1. A four-wheel drive system comprising: a plurality of load units independently or partially coaxially coupled to each wheel of a four-wheel drive vehicle; and a control unit that controls running resistance or torque by synchronizing the load units. In the dynamometer for a driving vehicle, the control unit includes a divider (9) for equally allocating a total running resistance command or a total torque command to each load unit, and a detection torque of one load unit serving as a master. Adders / subtractors (11 to 13) each of which corrects the output of the divider based on the difference between the detected torque of the other load and the detected torque of the other load, and obtains the detected torque of the other load. And a subtractor (1) for subtracting the output of the adder from the total running resistance command or the total torque command to obtain a torque command for the master load unit.
0). A synchronous control device for a dynamometer for a four-wheel drive vehicle, comprising: