Passenger car wheel resistance torque testing method and test data automatic processing method

Abstract

The application relates to a passenger car wheel resistance torque test method and an automatic test data processing method. The method comprises the following steps: preparing a test sample, arranging a coupling and a sensor, and testing and collecting data. The test sample is prepared: the test is carried out on a whole vehicle, the test vehicle is lifted by a lifting device, and the tested wheel is ensured to be in a test state. The coupling and the sensor are arranged: the wheel is connected with a driving device through the coupling, a torque sensor, a wheel rotation angle sensor and an energy consumption sensor are installed on the rotation center between the coupling and the driving device, and an electric cylinder controlled by a test program is installed at a whole vehicle brake pedal. The testing and data collecting are carried out: the test is automatically controlled in sequence by writing a test program, and signals transmitted by the sensors are collected in real time. Through the test method, the wheel resistance torque and the resistance energy consumption can be tested, the data automatic processing method can improve the test data processing efficiency and reduce the test cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle testing, in particular to a passenger vehicle wheel resistance torque testing method and test data automatic processing method. BACKGROUND

[0002] Since the passenger vehicle wheel resistance torque is closely related to the vehicle fuel consumption, brake friction pad wear, etc., it is necessary to test the passenger vehicle wheel resistance torque by experimental means. Some automobile manufacturers have special equipment for testing wheel resistance torque, but the testing method is not public.

[0003] In the prior art, the testing of the passenger vehicle wheel resistance torque is mostly provided by a device or system, and the testing is carried out on the basis of the provided device or system. Moreover, it can only be used for single wheel resistance torque testing, and cannot be used for simultaneous testing of other data related to the wheel resistance torque, such as resistance energy consumption. SUMMARY

[0004] In order to solve the above problems, the present application provides a passenger vehicle wheel resistance torque testing method and test data automatic processing method, which can realize the testing of wheel resistance torque and resistance energy consumption, and master the correlation between wheel resistance torque and vehicle fuel consumption. The data automatic processing method can improve the test data processing efficiency and reduce the test cost.

[0005] The present application provides a passenger vehicle wheel resistance torque testing method, which comprises a prepared test sample, arrangement of a coupling and a sensor, and testing and data acquisition.

[0006] The prepared test sample is tested on a vehicle, the test vehicle is lifted by a lifting device, and the measured wheel is ensured to be in a test state.

[0007] The arrangement of the coupling and the sensor connects the wheel and the driving device through the coupling, and installs a torque sensor, a wheel rotation angle sensor and an energy consumption sensor on the rotation center between the coupling and the driving device, and installs an electric cylinder that can be controlled by a test program at the vehicle brake pedal.

[0008] The testing and data acquisition is automatically controlled by a test program in sequence, and the signals transmitted by the sensors are collected in real time.

[0009] Further, the measured wheel in the test state is that the posture of the suspension system on the side of the measured wheel is consistent with that when the vehicle is on a horizontal road surface, and the measured wheel can rotate freely.

[0010] Further, when the wheel is connected with the driving device, the rotation axis of the wheel is ensured to be consistent with the driving shaft of the driving device.

[0011] Further, the torque sensor is used to measure the resistance torque when the wheel rotates, the wheel angle sensor is used to measure the wheel angle, and the energy consumption sensor is used to measure the energy loss during rotation.

[0012] Further, the electric cylinder controls the position of the brake pedal each time the brake pedal is depressed.

[0013] Further, the test procedure is specifically:

[0014] (1) Control the electric cylinder to depress the brake pedal to the required stroke, and memorize the electric cylinder stroke s1, keep t1 time, then control the driving device to drive the wheel to rotate at n1 speed, and stop after the system reaches a stable state;

[0015] (2) After standing for t2 time, drive the wheel to rotate at n2 speed, and record the relationship curve between the driving torque and the wheel angle during the wheel rotation;

[0016] (3) Control the electric cylinder to depress the brake pedal to the memorized stroke s1, keep t1 time, then release, and repeat the test according to step (2);

[0017] (4) Remove the brake caliper or brake pad and perform the test according to step (2).

[0018] Further, in step (1), when the driving device is controlled to drive the wheel to rotate at n1 speed, the rotation time is greater than or equal to 1 min.

[0019] Further, in step (2), the relationship curve between the driving torque and the wheel angle during the rotation of the wheel from the 3rd to the 10th circle is recorded.

[0020] Further, the sampling frequency of the signals collected by the sensors is greater than or equal to 500 Hz.

[0021] The present application provides an automatic processing method for the data obtained by the above-mentioned test method, wherein the automatic processing method is to process the data obtained in the test by pre-editing programs, including automatic calculation of wheel resistance torque, automatic calculation of energy consumption value and automatic generation of test curve.

[0022] The automatic calculation of the wheel resistance torque: automatically calculate the maximum value, minimum value and average value of the wheel resistance torque under each working condition according to the collected data, and automatically remove the data of the first 2 circles of wheel rotation from the calculated values;

[0023] The automatic calculation of the energy consumption value: automatically calculate the energy loss value according to the collected resistance torque value and the measured wheel angle data, and automatically remove the data of the first 2 circles of wheel rotation from the energy loss value;

[0024] The automatic generation of the test curve: the information collected by the sensor is drawn into a curve graph, the abscissa and the ordinate of the image correspond to the collected information under each working condition according to actual needs, and the abscissa and the ordinate are both linear scales.

[0025] The beneficial effects of the present application are that the passenger car wheel resistance torque testing method comprises preparing a test sample, arranging a coupling and a sensor, and testing and collecting data.

[0026] Through a reasonable sample preparation and sensor arrangement scheme, the influence of external factors such as sample installation on the test results is reduced, and the test precision is improved.

[0027] By formulating a reasonable test scheme and a data collection scheme, the influence of the wheel rotational inertia on the wheel resistance torque measurement can be reduced or even eliminated, so that the measured wheel resistance torque and energy consumption are closer to the actual use working condition of the whole vehicle.

[0028] The automatic test data processing method is to pre-edit a program to process the data obtained in the test, including automatic calculation of the wheel resistance torque, automatic calculation of the energy consumption value, and automatic generation of the test curve.

[0029] The automatic calculation can automatically calculate the energy loss value through the collected torque value and the rotation angle relationship data, and present the test results through the test curve, so that the tester can intuitively master the test information and improve the processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a passenger car wheel resistance torque testing method flowchart. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The present application provides a passenger car wheel resistance torque testing method, as shown in Figure 1 The method comprises preparing a test sample, arranging a coupling and a sensor, and testing and collecting data.

[0033] The test sample is prepared: the test is carried out on the whole vehicle, the test vehicle is lifted by a lifting device, and the measured wheel is ensured to be in a test state.

[0034] The posture of the suspension system on the side of the measured wheel is consistent with that when the vehicle is on a horizontal road surface, and the measured wheel can rotate freely.

[0035] Arranging the coupling and the sensor: the coupling is used to connect the wheel and the driving device, and to ensure that the rotation axis of the wheel is consistent with the driving shaft of the driving device.

[0036] The torque sensor, the wheel rotation angle sensor and the energy consumption sensor are installed on the rotation center between the coupling and the driving device, and the electric cylinder controlled by the test program is installed at the brake pedal of the whole vehicle, which controls the position of each brake pedal.

[0037] The torque sensor is used to measure the resistance torque when the wheel rotates, the wheel rotation angle sensor is used to measure the wheel rotation angle, and the energy consumption sensor is used to measure the energy loss during rotation.

[0038] Testing and data acquisition: the test is automatically controlled by the test program in sequence, and the signals from the sensors are collected in real time. When writing the test program, parameters such as the rotation speed of the driving device when driving the wheel, the control wheel rotation number, the test process static time, the selection of signal acquisition, and the setting of sampling frequency should be included. The test sampling frequency is not less than 500Hz.

[0039] The test program is as follows:

[0040] First, make the wheel stationary, reset the position of the electric cylinder at the pedal, and zero the sensors, which is the initial state of the test.

[0041] The test is automatically controlled by the test program in sequence, and the test sequence is as follows:

[0042] (1) Control the electric cylinder to step on the brake pedal to the required stroke, and remember the electric cylinder stroke s1, keep it for t1 time, then release it, and then control the driving device to drive the wheel to rotate at n1 speed for not less than 1 min, and stop when the system reaches a stable state.

[0043] (2) After standing for t2 time, drive the wheel to rotate at n2 speed, and record the relationship curve between the driving torque and the wheel rotation angle during the rotation of the 3rd to 10th circle.

[0044] (3) Control the electric cylinder to step on the brake pedal to the memory stroke s1, keep it for t1 time, then release it, and repeat the test according to step (2).

[0045] (4) Remove the brake caliper or brake pad and perform the test according to step (2).

[0046] During the test, the test data is also collected, and different test steps correspond to different data collection requirements, as shown in Table 1:

[0047] Table 1

[0048]

[0049] The application provides an automatic processing method of data obtained by the test method, the automatic processing method is to process the data obtained in the test by pre-editing program, including automatic calculation of wheel resistance torque, automatic calculation of energy consumption value and automatic generation of test curve.

[0050] Automatic calculation of wheel resistance torque: automatically calculate the maximum value, minimum value and average value of wheel resistance torque under each working condition according to the collected data, and automatically remove the data of the first two rounds of wheel rotation from the calculated values.

[0051] Automatic calculation of energy consumption value: automatically calculate the energy consumption value according to the collected resistance torque value and the measured wheel rotation angle data, and automatically remove the data of the first two rounds of wheel rotation on the basis of the energy consumption value.

[0052] Automatic generation of test curve: the wheel resistance torque and energy consumption value collected by the sensor are graphically displayed; the horizontal coordinate of the image is the wheel rotation angle, and the scale is linear; the vertical coordinate of the image is the instantaneous value of the wheel resistance torque and the cumulative value of the energy consumption, and the scale is linear; the sampling frequency, holding time, wheel speed, pedal displacement and other information corresponding to each working condition can be displayed in the graph. The horizontal coordinate of the graph can be switched to time, and the scale is linear. The display curve corresponding to the vertical coordinate can be automatically converted.

Claims

1. A passenger vehicle wheel resistance torque testing method, characterized by, The method comprises preparing a test sample, arranging a coupling and sensors, and testing and collecting data; The test sample is tested on a whole vehicle, the test vehicle is lifted by a lifting device, and the tested wheel is in a test state; The arrangement of the coupling and the sensors: the wheel is connected with the driving device through the coupling, the torque sensor, the wheel rotation angle sensor and the energy consumption sensor are installed on the rotation center between the coupling and the driving device, and the electric cylinder controlled by the test program is installed at the brake pedal of the whole vehicle; The testing and data collecting: the test is automatically controlled in sequence under different working conditions by writing the test program, and the signals from the sensors are collected in real time; The test program is specifically as follows: (1) control the electric cylinder to step on the brake pedal to the required stroke, and memorize the stroke s1 of the electric cylinder, keep for t1 time, then release, and then control the driving device to drive the wheel to rotate at the speed of n1, and stop when the system reaches a stable state; (2) after standing still for t2 time, drive the wheel to rotate at the speed of n2, and record the relationship curve between the driving torque and the wheel rotation angle during the wheel rotation; (3) control the electric cylinder to step on the brake pedal to the memorized stroke s1, keep for t1 time, then release, and repeat the test according to step (2); (4) remove the brake caliper or brake pad and test according to step (2).

2. The passenger vehicle wheel resistance torque test method of claim 1, wherein, The tested wheel is in a test state, that is, the posture of the suspension system on the side of the tested wheel is consistent with that when the vehicle is on a horizontal road surface, and the tested wheel can rotate freely.

3. The passenger vehicle wheel resistance torque test method of claim 1, wherein, When the wheel is connected with the driving device, the rotation axis of the wheel is consistent with the driving shaft of the driving device.

4. The passenger vehicle wheel resistance torque test method of claim 1, wherein, The torque sensor is used to measure the resistance torque during the wheel rotation, the wheel rotation angle sensor is used to measure the wheel rotation angle, and the energy consumption sensor is used to measure the energy loss during the rotation.

5. The passenger vehicle wheel resistance torque test method of claim 1 wherein, The electric cylinder controls the position of the brake pedal each time.

6. The passenger vehicle wheel resistance torque test method of claim 5, wherein, In step (1), when the driving device is controlled to drive the wheel to rotate at the speed of n1, the rotation time is greater than or equal to 1 min.

7. The passenger vehicle wheel resistance torque test method of claim 6 wherein, In step (2), the relationship curve between the driving torque and the wheel rotation angle during the 3rd to 10th rotations of the wheel is recorded.

8. The passenger vehicle wheel resistance torque test method of claim 1, wherein, The sampling frequency of the collected signals from the sensors is greater than or equal to 500 HZ.

9. A method for the automatic processing of data obtained by a test method according to any one of claims 1 to 8, characterized in that, The automatic processing method is to edit the program in advance to process the data obtained in the test, including automatic calculation of the wheel resistance torque, automatic calculation of the energy consumption value and automatic generation of the test curve; The automatic calculation of the wheel resistance torque: the maximum value, the minimum value and the average value of the wheel resistance torque under each working condition are automatically calculated according to the collected data, and the calculated values automatically remove the data of the first 2 rotations of the wheel; The automatic calculation of the energy consumption value: the energy loss value is automatically calculated according to the collected resistance torque value and the measured wheel rotation angle data, and the energy loss value automatically removes the data of the first 2 rotations of the wheel; The automatic generation of the test curve: the information collected by the sensors is drawn into a curve graph, the horizontal and vertical coordinates of the image correspond to the information collected under each working condition according to actual needs, and the horizontal and vertical coordinates are linear scales.

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