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In order to improve the braking performance of vehicles, most cars are equipped with limited-pressure valves and proportional valves, which are used to control the distribution of braking force on the front and rear axles to prevent the rear wheels from sliding heavily when the rear wheels are locked during braking. With increasingly stringent safety standards and regulations, brake anti-lock system oils are increasingly being installed in modern automobiles as standard equipment. In addition, many cars also have four-wheel drive capabilities. Therefore, the role of these relevant parts should be included in the assessment of vehicle safety. In addition, the speed of modern automobiles is high, and the axle load is transferred when the vehicle is braking, and the quality of the entire vehicle shifts to the forward axis in an instant.
The sum of the front axle left and right wheel braking forces is often greater than the front axle static axle load, and the sum of the rear axle left and right wheel braking forces is often smaller than the rear axle static axle loads. In the design and manufacture, the front wheel braking force has a large design capability, so that the front Wheel braking becomes part of the main braking action. Therefore, the detection under dynamic conditions is very important to determine the braking performance of the car in actual driving. The detection method of modern automobile braking performance must adapt to the development of automotive technology.
The disadvantages of the testing under the static condition of the drum brake test bench can be understood as that the car brake performance can be understood as that the car is stationary and the road surface rolls under the wheels, that is, the car is in a static state, so this method is analogous . The force situation at this time is very different from the braking when the car is driving on the road, and it cannot reflect the axle load transfer of the car during braking.
Because the automobile's pressure-limiting valve and proportional valve do not work, it cannot reflect the difference in the growth process of the front-rear axle braking force. For four-wheel drive vehicles, the axles can only be unilaterally tested on a brake test stand equipped with two pairs of rollers. The measured braking force on the front and rear axles is not the same as the braking effect on the road surface.
The relative speed of the vehicle at the time of testing does not work at this speed. Therefore, the braking performance of the system-equipped vehicle cannot be detected. The result of this test only reflects the brake function of the wheel brakes, but other factors that have a dynamic impact on the braking performance, such as axle load distribution pressure limiting valves and proportional valve suspension wheels and tires, have no effect. It is taken into account.
In the practice of testing the braking performance of a vehicle with a drum brake test stand, such an anomaly often occurs. The more high-end vehicles with good performance are often equipped with systems, and the test results are not satisfactory.
This is due to the fact that the structure of the drum brake test stand and the reason why the car is static are limited by the adhesion coefficient between the roller and the tire, and the maximum braking force of the front axle cannot be measured, so that the true maximum braking force of the entire vehicle cannot be measured.
In addition, the time required to perform the test with the drum brake test stand is longer. At least one test is needed to complete the service brake and the parking brake, and for the vehicle with the lower spoiler or suspension, and the collision with the drum. danger. Drum brake test bench installation is also more complex, need to do a special concrete foundation and equipped with power and other equipment.
Advantages of testing under dynamic conditions on the flatbed brake test bench Early flatbed brake test rigs Due to the limitations of the electronics technology, it is difficult for sensors and sampling systems to meet inspection requirements.
In recent years, with the rapid development of electronic technology, especially computer technology, flat panel brake test benches have adopted electronic technology and computer control technology. Therefore, the performance of all aspects of the new generation of flat-panel brake test bench has made a qualitative leap.
Flat-plate brake tester is based on the actual emergency braking process on the test plate to determine the front-rear axle braking force of the car, that is, it is tested under the state of running braking of the car, so it is a kind of dynamic detection.
The flatbed brake test bench and its dynamic detection technology rely on an electronic computer to process the test data to ensure that when obtaining the full details of the dynamic braking process of the car, the car is driven onto the test bench at a clever speed so that the car approaches the road. The emergency braking state, so you can get the real brake detection results of the car.
The vertical braking force of the vehicle's horizontal braking force and the vertical load during the braking process can be measured by a tension sensor and a pressure sensor and sent to the data acquisition and analysis system. The test result is the comprehensive actual performance of the vehicle braking performance. Therefore, it is possible to detect the braking performance of a passenger car including a system.
In addition, as mentioned earlier, the front axle braking force of modern cars accounts for a large proportion of the brake force of the whole vehicle. The flatbed brake test bench can simultaneously perform dynamic detection of each wheel of the vehicle, and the detection result is in accordance with the actual situation.
In addition to detecting the braking performance of a car, a flat-plate type brake test stand produced abroad can also perform shaft mass side slip detection and suspension damper performance detection simultaneously in the process of detecting the braking force.
Flatbed brake test stand for the differential braking force of the left and right wheels of each wheel braking force Braking force of the entire vehicle Brake braking coordination time Brake release time and brake force curve with time curve The large-screen color display shows that key parameters are displayed numerically and supplemented with diagnostic conclusions.
By analyzing the fluctuation of the vertical force of the front and rear wheels in the braking process, the attenuation of the vibration of the car body can be learned, and the technical condition of the car suspension system can be judged. The flatbed brake test bench does not require auxiliary equipment and does not require a dedicated use site. It can be installed directly on the level ground.
Although the flat-plate brake tester also has disadvantages such as the inability to separate the braking force of the middle and rear axles and the inconvenience of detecting the semi-trailer and the full-trailer when the automobile with double rear axle drive is detected with high price, it can be detected under dynamic conditions. The advantages of braking performance are still mainly obvious. With the development of automotive technology and increasingly stringent automotive safety regulations, flatbed brake test rigs should be widely used instead of drum brake test rigs.
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