JPH05215644A - Method for controlling vehicle testing device - Google Patents

Abstract

PURPOSE:To easily and adequately control the torque of a dynamo meter so as to perform simulation of actual road tests which are approximated to the running state of a vehicle on an actual road by controlling torque depending on the running resistance of the vehicle and adding a propeller shaft torque control section to a stroke control section. CONSTITUTION:A stroke control section 8 which adjusts the accelerator aperture of a vehicle controls a throttle actuator 6 by comparing the stroke controlling output value of a propeller shaft torque control section 18 with a stroke detecting value fed back from the actuator 6 and suitably adjusts the accelerator aperture of the vehicle by operating a throttle wire 7. The control section 18 compares the set value of the propeller shaft torque with the output value of the propeller shaft torque detected from a dynamo meter 5 through a load cell 11, etc., and sends a stroke controlling output value to the control section 8. In addition, a car speed limiter control section 21 adjusts the accelerator aperture by controlling the limiter of the control section 18 and sending the controlled stroke controlling output value to the control section 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method when a running simulation test is performed by a vehicle test device using a dynamometer.

[0002]

2. Description of the Related Art Conventionally, when a vehicle simulation apparatus using a dynamometer is used to conduct a running simulation test for measuring the vibration noise inside a test vehicle, the means shown in FIG. 3 is used. In this conventional means, the test vehicle 1 is set such that its drive wheels 2 roll on rollers 3 of the vehicle testing device.
Then, the dynamometer 5 is connected to the roller 3 via the clutch 4.
, And a load corresponding to running on the actual road is applied to the roller 3 by the dynamometer 5, and a running simulation test of the test vehicle 1 is performed.

Throttle control for adjusting the driving force of the test vehicle 1 is performed by appropriately adjusting the accelerator opening of the vehicle by stroke control. Therefore, the throttle wire 7 operated by the throttle actuator 6 is connected to the accelerator of the test vehicle 1, and the throttle actuator 6 is feedback-controlled by the stroke control unit 8. The stroke control unit 8 compares the stroke setting value with the stroke detection value of the throttle actuator 6,
The throttle output is controlled by the deviation output.

The dynamometer 5 is feedback-controlled by the speed controller 9. For this reason, the speed control unit 9 controls the vehicle speed set value and the pulse pickup 1 installed in the dynamometer 5.
The detected value of 0 is compared, and the dynamometer 5 is controlled by the deviation output.

Further, in the conventional device, the peller shaft torque is detected. Therefore, the output of the load cell 11 attached to the dynamometer 5 is amplified by the strain amplifier 12, and the detected output is sent to the operational amplifier 13. The operational amplifier 13 compares the detected value from the strain amplifier 12 with the input value dN / dt obtained by differentiating the torque with respect to time, outputs the roller driving force value, and sends it to the multiplier 14. The multiplier 14 multiplies the output value of the roller driving force by a coefficient R / i composed of the drive wheel radius and the differential ratio, and outputs the output value.
It was supposed to be displayed on 5.

When a running simulation test is performed by the conventional vehicle testing apparatus as described above, the acceleration / deceleration is controlled so as to correspond to the propeller shaft torque corresponding to the actual running. For this reason, the peller shaft torque value of the display unit 15 is set to a predetermined value,
The traveling simulation test is performed by controlling the speed of the dynamometer 5 by the speed control unit 9 and controlling the driving force of the test vehicle 1 to be appropriately changed by the stroke control unit 8.

[0007]

In the conventional control method for the vehicle testing apparatus as described above, the stroke control section and the speed control section, which are not related to each other in terms of control function, must be separately controlled. Moreover, such separate control operations must be performed so that the test vehicle is loaded with running resistance and the vehicle speed is accelerated or decelerated while maintaining a predetermined peller shaft torque value, which is extremely difficult to control. There was a problem that there was.

In view of the above points, the present invention newly provides a control method for a vehicle test apparatus that enables easy and proper control, and that is capable of executing a running simulation test that is extremely close to an actual road running state. To aim.

[0009]

According to a control method for a vehicle test apparatus of the present invention, a dynamometer of the test apparatus controls a running resistance applied to a driving wheel of the vehicle by torque, and an accelerator opening of a test vehicle is set to a peller shaft. The control is performed based on the control output of the torque control unit, and the vehicle speed can also be controlled and managed by adding the vehicle speed limiter control to the propeller shaft torque control unit.

[0010]

With the above-mentioned configuration, the acceleration torque, the deceleration torque, and the constant vehicle speed holding value of the test vehicle can be arbitrarily set, and the traveling simulation that is extremely close to the actual road can be performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control method for a vehicle testing device according to the present invention will be described below with reference to FIGS. In FIG. 1, parts corresponding to those of the conventional example shown in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 1 is a test vehicle, 2 is a drive wheel, 3 is a roller, 4 is a clutch, 5 is a dynamometer, 6 is a throttle actuator, 7 is a throttle wire, and 8 is a stroke controller.

Also in the device of this example, the peller shaft torque is detected as in the conventional device. Therefore, the output of the load cell 11 attached to the dynamometer 5 is transferred to the strain amplifier 12
And the detected output is sent to the operational amplifier 13. The operational amplifier 13 compares the detection output with the human power value dN / dt obtained by differentiating the torque with respect to time, and outputs the roller driving force value,
Send to the multiplier 14. The multiplier 14 multiplies the output value of the roller driving force by a coefficient R / i composed of the drive wheel radius and the differential ratio, and displays the output value of the peller shaft torque on the display unit 1.
It is what is displayed in 5.

In the test apparatus of this example, the dynamometer 5 is controlled by the torque controller 16. That is, the torque control unit 1
In 6, the running resistance setting device 17 compares the set output value corresponding to the vehicle speed with the detection output of the strain amplifier 12, and the deviation output controls the dynamometer 5.

In the apparatus of this example, the stroke control unit 8 for adjusting the accelerator opening of the test vehicle 1 compares the stroke control output value of the peller shaft torque control unit 18 with the stroke detection value fed back from the throttle actuator 6. The throttle actuator 6 is controlled and the throttle wire 7 is operated to appropriately adjust the accelerator opening of the vehicle. The propeller shaft torque control unit 18 compares the propeller shaft torque setting value with the output value of the propeller shaft torque detected from the dynamometer 5 via the load cell 11 or the like to send the stroke control output value to the stroke control unit 8. To

Further, in the apparatus of this example, the roller 3 of the test apparatus is used.
The frequency / voltage converter (F / V) 20 converts the signal generated by the pulse pickup 19 connected to the vehicle and sends it to the vehicle speed limiter control unit 21 as an actual vehicle speed value. The vehicle speed limiter control unit 21 compares the actual vehicle speed value with the vehicle speed limiter setting value, and controls the limiter of the above-mentioned peller shaft torque control unit 18 with the deviation output value, and outputs the controlled stroke control output value. Stroke control unit 8
To adjust the accelerator opening.

Next, a case where a running simulation test is performed by the above control means will be described. First, the required traveling resistance, the propeller shaft torque setting value, and the vehicle speed limiter setting value are input in correspondence with the purpose of the traveling simulation test. And
As shown in FIG. 2, the following is performed when running simulation tests of acceleration, constant speed, and deceleration are performed. First, during acceleration, torque control is performed on the accelerator opening of the dynamometer 5 and the test vehicle 1 to bring the vehicle into an accelerated state. Next, at constant speed, the vehicle speed limiter control unit 2
With the control action of No. 1, the accelerator opening is controlled to realize a constant speed traveling state. Next, during deceleration, the accelerator opening of the dynamometer 5 and the test vehicle 1 is torque-controlled to bring it into a decelerated state. The tire shaft torque can be easily calculated by multiplying the roller surface driving force of the roller 3 of the test apparatus by the amount of the tire radius. Therefore, the running simulation test can be performed by replacing the acceleration / deceleration torque with the tire shaft torque.

[0017]

As described in detail above, according to the control method for the vehicle test apparatus of the present invention, the dynamometer of the test apparatus controls the running resistance applied to the driving wheels of the vehicle by torque to open the accelerator of the test vehicle. The speed is controlled based on the control output of the propeller shaft torque control unit, and the vehicle speed can be controlled and controlled by adding the vehicle speed limiter control to the propeller shaft torque control unit. The torque and the constant vehicle speed holding value can be arbitrarily set. In addition, a driving simulation test that is extremely close to an actual road is possible, and there is an effect that vibrations, noises, etc. inside the vehicle can be measured with good reproducibility. Further, since the acceleration / deceleration state and the constant vehicle speed state are both controlled by the torque, smooth transition can be performed even when the acceleration / deceleration state is changed to the constant vehicle speed state.For example, the torque control in the acceleration / deceleration state is switched to the speed control. There is an effect that it is possible to prevent a shock such as control switching from being applied to the test vehicle as when shifting to a constant vehicle speed state.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram showing an embodiment of a control method for a vehicle testing device according to the present invention.

FIG. 2 is an explanatory diagram illustrating a traveling simulation test using the control method of the above embodiment.

FIG. 3 is a schematic explanatory diagram illustrating a control method of a conventional vehicle testing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Test vehicle, 2 ... Drive wheel, 3 ... Roller, 5 ... Dynamometer, 6 ... Throttle achector, 8 ... Stroke control part, 16 ... Torque control part, 17 ... Running resistance setting device,
18 ... Peller shaft torque control unit, 21 ... Vehicle speed limiter control unit.

Claims (1)

[Claims] 1. A roller for rolling a drive wheel of a test vehicle is rotationally braked by a dynamometer, and a throttle wire of a throttle actuator controlled by a stroke control section is operated to control an accelerator opening degree of the test vehicle. In the control method of the vehicle testing device described above, the dynamometer is subjected to torque control corresponding to running resistance, and a peller shaft torque control unit is added to the stroke control unit to control the accelerator opening by torque. A control method for a vehicle testing device, wherein a limiter of a torque control unit is controlled by a vehicle speed limiter control unit to control an accelerator opening so as to maintain a constant vehicle speed.