JP3208904B2 - Control method of brake dynamo system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a brake dynamo system for testing a brake.

[0002]

2. Description of the Related Art A conventional single brake dynamo system is shown in FIG. In the figure, 1 is a DC motor, 2 is a flywheel, 3 is a torque meter, BK is a brake attached to the torque meter, and 4 is a disk of a brake BK rotated by the DC motor 1 via the flywheel. .

There are three types of control methods in such a brake dynamo system: (1) stroke control, (2) pressure control, and (3) torque control. When pressure control is performed, stroke control is performed as a minor loop, and when torque control is performed, pressure control and stroke control are performed as a minor loop. However, when performing torque control, a feedforward loop is provided to ensure responsiveness.

FIG. 5 shows an example of the torque control. In the figure, reference numeral 21 denotes a torque control amplifier for amplifying the difference between the brake torque set value T _S and the torque detection value T, and 22 a pressure control amplifier for amplifying the difference between the output of the amplifier 21 and the oil pressure detection value P.

Reference numeral 23 denotes a feedforward loop including a torque / hydraulic coefficient circuit 24 and a hydraulic / stroke function circuit to which the brake torque set value T _S is input.
2 is a stroke control circuit of a hydraulic cylinder for moving a brake by adding a feedforward value from a feedforward loop 23 to an output of the hydraulic cylinder.

[0006]

In the minor loop system, it is necessary to ensure control response and stability. However, if the torque is controlled to be constant by the torque control method, the pressure is unmanaged, so that the control value cannot be fixed.

[0007] Therefore, when the constant output of the brake is controlled by the torque control, the pressure, which is the operation amount on the input side, fluctuates greatly, which is greatly different from the actual brake braking. Therefore, a person controls the input value by pressure control so as to match the torque value.

[0008] Further, when the constant pressure of the brake is controlled by the pressure control, the torque is unmanaged, so it is not known what the torque value will be. Therefore, control for setting the value of the brake torque and keeping the pressure constant cannot be realized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a brake dynamo system capable of performing a brake test in a method suitable for actual braking in torque control. Is to provide a control method.

[0010]

To achieve the above object, a control system of a brake dynamo system according to the present invention comprises a torque control circuit capable of switching between a torque control and a pressure control, and a torque averaging method at the time of control. A storage circuit for storing the pressure average value and the pressure average value, and using the stored torque average value and pressure average value as the previous torque average value and previous pressure average value as the torque command value, the torque average previous value, and the pressure average previous value to the pressure target value. The first test is performed by the torque control method, and the second test is performed by the memory circuit.
Pressure control using the previous average pressure value stored in the road as the target value
The third and subsequent tests are performed by a pressure control method using a target pressure value learned by the learning circuit.

[0011]

[Action] In the first test, the torque control circuit performs constant torque control. In the second test, the pressure control circuit is switched to perform pressure control using the first pressure average value as a command. In the third and subsequent tests, the torque control value and the previous torque are used. Since the control is performed with the pressure value obtained by learning using the average value and the previous pressure average value as a command, the target value of the pressure control does not shift even if the environment such as the brake temperature changes, and the torque is maintained. Alternatively, the brake can be tested without uncontrolled pressure.

[0012]

An embodiment of the present invention will be described with reference to the drawings.
Referring to FIG. 1, reference numeral 11 denotes a torque control amplifier that amplifies a bias between a torque set value T _S and a torque detection value T, and 12 denotes a learning circuit that outputs a pressure command. 16 pressure control amplifier for amplifying the difference between the pressure command value P ₁ or P _n and the pressure detection value P input from the pressure control amplifier 11 or the learning circuit 12 through the switch SW _1.

Reference numeral 17 denotes a torque feed forward gain circuit to which the torque set value T _S is input, and reference numeral 18 denotes a switch SW _1.
Torque command value P ₁ or pressure feed forward gain circuit P _n is input, A ₁ is the pressure control amplifier output from
Feed forward gain circuit 17 or 18 through the switch SW ₃ from adding feedforward value input adder, 19 is a stroke control amplifier for amplifying the difference between the output and the stroke detection value L of the adder A _1.

The learning circuit 12 includes a divider 13 for dividing the previous pressure average value P _n-1 by the previous torque average value T _n-1 and a subtractor S ₁ for subtracting the previous torque average value T _n1 from the torque setting T _S. a multiplier 14 multiplying the output T _S -T _n-1 = e of the subtractor S ₁ to the output of the divider 13, the output from the subtractor S ₁ is a not determined whether in the specification value And a decision circuit 15 for outputting the time.

A switch SW which is switched by the output of the decision circuit 15 and outputs the output of the multiplier 14 or the zero value
_2, adds the output of the changeover switch SW ₂ to the pressure average previous value P _n-1, this pressure command to the changeover switch SW ₁ P _n =
And a _{P n-1 + P n-} 1 (T S -T n-1) / (T S -T n-1) outputs the adder A ₂ Prefecture.

Next, the operation of this embodiment will be described with reference to FIGS. The control is performed according to the flow shown in FIG. When the target control is selected as shown in FIG. 2, in the first test, the switches SW ₁ and SW ₃ are set to the a side, and the torque control is performed by the circuits 11, 16, 17, and 19 similar to the conventional torque control circuit. Perform (S1). Stores the average value of the detected pressure value at the time of testing as average pressure P ₁ to obtain the second target torque value (S2).

The second and subsequent tests are performed under pressure control. 2
Times th test using the pressure average previous value P ₁ stored by switching the switch SW ₁ to SW ₃ to side b A _2, 16,1
Pressure control similar to the conventional _one is performed by the circuits of 8, A1, and 19 (S3). Storing the mean value and the torque detection value of the pressure detection value of the test as the average previous value P ₂ and the torque average previous value T ₂ (S4). If the pressure setting in the pressure control is fixed, the target value will be deviated from the target value due to environmental changes such as temperature due to heat generated in the brake at the time of the test.

[0018]

(Equation 1)

After the third time, the learning circuit 12 obtains the target value _Pn by learning and controls the pressure. That is, the judgment circuit 15
Switches the switch SW ₂ when the torque command value T _S and the torque average previous value T _n-1 of the deviation e of the outside to determine whether there within specification values to the a side in. (S5, S6).

[0020] Thus, the output switch SW ₂ is the Ru switched to a side 13, 14, the circuit of A ₂ (1) as P _n are calculated pressure target value P _n of formulas adder A ₂ pressure control (S7, S9). Further, the deviation e is if within the range of specification values and outputs pressure control as it is as a pressure target value P _n switching Ri pressure average previous value P _n-1 switch SW ₂ is the b-side from the adder A ₂ ( S8, S9).

The detected pressure value and the detected torque value during the pressure control are stored as the previous pressure average value and the previous torque average value (S10), and are used for the next learning. Table 1 shows the relationship between the n-th torque target, pressure setting, and control.

[0022]

[Table 1]

It is needless to say that the control circuit and the control flow are not limited to the above embodiment.

[0024]

According to the control method of the brake dynamometer system of the present invention, the first brake test is performed by torque control, the second and subsequent brake tests are performed by pressure control, and the third and subsequent pressure controls are set by learning. As a result, a large fluctuation of the input-side operation amount (pressure) unlike the conventional minor loop type torque control is eliminated, and a brake braking test close to the actual one can be performed. Further, since it is not necessary for a person to control an input value for pressure control so as to match a torque value as in the related art, the efficiency of a test can be improved.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of the present invention.

FIG. 2 is a waveform chart of a torque target control.

FIG. 3 is an operation flowchart of the embodiment.

FIG. 4 is a configuration diagram showing a single brake dynamo system.

FIG. 5 is a block diagram showing a conventional torque control circuit.

[Explanation of symbols]

 11, 21 ... torque control amplifier 12 ... learning circuit 13 ... divider 14 ... multiplier 15 ... determination circuit 16, 22 ... pressure control amplifier 17 ... torque feed forward gain circuit 18 ... pressure feed forward gain circuit 19, 26 ... stroke control Amplifier

Claims (2)

(57) [Claims] A torque control circuit configured to switch between torque control and pressure control; a storage circuit storing a torque average value and a pressure average value during control; and a storage circuit storing the stored torque average value and pressure average value. A learning circuit for obtaining the torque command value as the previous torque average value and the previous pressure average value and the pressure target value from the torque average previous value and the pressure average previous value is provided. The first test is performed by the torque control method, and the second test is performed. Is
The pressure average previous value stored in the storage circuit is set as a target value.
It carried out at a pressure control scheme Te, third and subsequent testing control system of the brake dynamo system, wherein the this <br/> carried out at a pressure control system at a pressure target value obtained by the learning in the learning circuit. 2. The method according to claim 1, wherein the learning circuit is provided with a deviation judging circuit between the torque set value and the previous torque average value, and when the deviation is within the specification, the pressure average previous value is output as a pressure target value. The control system for a brake dynamo system according to claim 1 .