JPH06273282A - Control system for brake dynamo system - Google Patents

Abstract

PURPOSE:To carry out the brake test through a method corresponding to the actual brake operation. CONSTITUTION:Torque control circuits 11, 17, and 19 and pressure control circuits 16, 18, and 19 are constituted so as to be selectable by selecting switches SW1 and SW3, and a learning circuit 12 which stores the torque average value and the pressure average value in control and obtains the target pressure value Pn=Pn-1+(Pn-1/Tn-1)X(TS-Tn-1) from the torque instruction TS, torque average value Tn-1 in the preceding time, and the pressure average value Pn-1, having the stored value as preceding time value, is installed, and the first test is carried out through the torque control system, and the tests in the second and the succeedings are carried out in the pressure control system, and the tests in the third and the succeedings are controlled with the target pressure value obtained in the learning circuit 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake dynamo system control 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 disc 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 included as a minor loop, and when torque control is performed, pressure control and stroke control are included as a minor loop. However, when torque control is performed, a feedforward loop is provided to ensure responsiveness.

An example of torque control is shown in FIG. In the figure, 21 is a torque control amplifier that amplifies the deviation between the brake torque setting value T _S and the torque detection value T, and 22 is a pressure control amplifier that amplifies the difference between the output of the amplifier 21 and the hydraulic pressure detection value P.

Reference numeral 23 is a feedforward loop composed of a torque / hydraulic pressure coefficient circuit 24 and a hydraulic pressure / stroke function circuit to which the brake torque set value T _S is inputted, and 26 is an amplifier 2
2 is a stroke control circuit of a hydraulic cylinder that moves a brake by adding a feedforward value from a feedforward loop 23 to the output of 2.

[0006]

In the minor loop system, it is necessary to secure control response and stability. However, if the torque is controlled to be constant by the torque control method, the pressure becomes unmanaged and the control value cannot be made constant.

Therefore, when constant output control of the brake is performed by torque control, the fluctuation of the pressure, which is the operation amount on the input side, is large, which is very different from the actual brake braking. Therefore, a person controls the input value by pressure control so as to match the torque value.

Further, when the constant pressure control of the brake is performed by the pressure control, the torque becomes unmanaged, so it is unknown what the torque value will be. Therefore, control which sets the value of the brake torque and keeps the pressure constant cannot be realized.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a brake dynamo system capable of performing a brake test by a method that matches actual brake braking in torque control. It is to provide a control method of.

[0010]

In order to achieve the above object, the control method of the brake dynamo system according to the present invention is configured such that the torque control circuit is switchable between torque control and pressure control, and the torque average during control is controlled. The memory circuit that stores the value and the pressure average value, and the stored torque average value and pressure average value as the previous torque average value and pressure average value are used as the torque command value, the torque average previous value, and the pressure average value from the pressure average previous value. A learning circuit to obtain is provided, the first test is performed by the torque control method, the second and subsequent tests are performed by the pressure control method, and the third and subsequent tests are controlled by the torque target value obtained by the learning circuit. Is.

[0011]

[Function] In the first test, constant torque control is performed by the torque control circuit, the second time is switched to the pressure control circuit, and the pressure control is performed by using the pressure average value of the first time as a command, and the torque control value and the previous torque after the third time. Since the control is performed with the pressure value obtained by learning using the average value and the previous pressure average value as the command, the target value for pressure control does not shift even if the environment such as the brake temperature changes, and the torque Alternatively, the brake can be tested without the pressure becoming uncontrolled.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, 11 is a torque control amplifier that amplifies the deviation between the torque set value T _S and the detected torque value T, and 12 is a learning circuit that outputs a pressure command. Reference numeral 16 is a pressure control amplifier for amplifying the difference between the pressure command value P ₁ or P _n input from the pressure control amplifier 11 or the learning circuit 12 via the changeover switch SW ₁ and the pressure detection value P.

Reference numeral 17 is a torque feedforward gain circuit to which the torque setting value T _S is input, and 18 is a switch SW ₁
A pressure feedforward gain circuit to which the torque command value P ₁ or P _{n from} is input, A ₁ is the pressure control amplifier output,
An adder for adding a feedforward value input from the feedforward gain circuit 17 or 18 via the changeover switch SW _3, and a stroke control amplifier 19 for amplifying the difference between the output of the adder A ₁ and the stroke detection value L.

The learning circuit 12 includes a divider 13 that divides the pressure average previous value P _n-1 by the torque average previous value T _n-1 , and a subtractor S ₁ that subtracts the torque average previous value T _n1 from the torque setting T _S. , A multiplier 14 that multiplies the output of the divider 13 by the output of the subtractor S ₁ , T _S −T _n−1 = e, and whether or not the output from the subtractor S ₁ is within the specification value. And the determination circuit 15 which outputs when.

A changeover switch SW which is switched by the output of the judgment circuit 15 and outputs the output of the multiplier 14 or the 0 value.
₂ and the output of the changeover switch SW ₂ are added to the pressure average previous value P _n−1 , and the present pressure command P _n = is given to the changeover switch SW _1.
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 put on the side a, and torque control is performed by the circuits 11, 16, 17 and 19 similar to the conventional torque control circuit. Perform (S1). The average value of the pressure detection values at the time of the test is stored as the pressure average value P ₁ for obtaining the second target torque value (S2).

The second and subsequent tests are performed under pressure control. Two
In the second test, the switches SW _{1 to} SW ₃ are switched to the b side and the stored pressure average previous value P ₁ is used to set A ₂ , 16, 1.
The same pressure control as the conventional _one is performed by the circuits A, A and A (S3). The average pressure detection value and the torque detection value at the time of the test are stored 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 kept constant, it will deviate from the target value due to environmental changes such as temperature due to heat generated in the brake during the test, so learning is performed using the following equation.

[0018]

[Equation 1]

From the third time onward, the learning circuit 12 obtains the target value P _n by learning and controls the pressure. That is, the determination circuit 15
At, it is judged whether the deviation e between the torque command value T _S and the torque average previous value T _n-1 is within the range of the specification value, and if it is out of the range, the switch SW ₂ is switched to the side b. (S5, S6).

However, when the switch SW ₂ is switched to the b side, the circuit of 13, 14, A ₂ calculates P _{n of the} equation (1) and outputs it as the pressure target value P _n from the adder A ₂ to control the pressure. (S7, S9). When the deviation e is out of the specified range, the switch SW ₂ is switched to the side a, and the pressure average previous value P _n-1 is output from the adder A _{2 as} it is as the pressure target value P _n to control the pressure ( S8, S9).

The pressure detection value and the torque detection value during the pressure control are stored as the pressure average previous value and the torque average previous 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]

Needless to say, the control circuit and control flow are not limited to those in 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 pressure controls are performed, and the third and subsequent pressure controls are set by learning. Therefore, unlike the conventional minor loop type torque control, there is no large fluctuation in the operation amount (pressure) on the input side, and a brake braking test close to the actual one can be performed. In addition, since it is not necessary for a person to control the input value in the pressure control so as to match the torque value as in the conventional case, the efficiency of the test can be improved.

[Brief description of drawings]

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

FIG. 2 is a torque target control waveform diagram.

FIG. 3 is an operation flow chart 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 ... Judgment 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)

[Claims] 1. A torque control circuit is configured to be switchable between torque control and pressure control, and a storage circuit for storing a torque average value and a pressure average value at the time of control and a stored torque average value and a pressure average value are stored. A torque command value as the previous torque average value and the pressure average value, and a learning circuit for obtaining the pressure target value from the torque average previous value and the pressure average previous value are provided, and the first test is performed by the torque control method, and the second and subsequent tests are performed. Is a pressure control system, and the third and subsequent tests are controlled by the torque target value obtained by the learning circuit. 2. A brake characterized in that a learning circuit is provided with a deviation judgment circuit for a torque setting value and a previous torque average value, and when the deviation is within specifications, the previous pressure average value is output as a target torque value. Dynamo system control method.