A winter performance test method for passenger car traction control system

Abstract

The present invention relates to a winter performance test method for a passenger car traction control system, including testing and data processing methods for five working conditions: stationary linear acceleration on a uniform road surface, stationary linear acceleration on a butted road surface, stationary linear acceleration on an open road surface, stationary climbing on an open ramp, and extreme acceleration driving on a ring, to examine the winter performance of a passenger car traction control system; the present invention can effectively simulate the actual use of the user by testing a sample vehicle, detect the performance parameters of the vehicle traction control system under different working conditions, and find the inherent defects, production defects or design defects of the traction control system. This provides a basis for providing high-quality samples for product development, so that the product has a higher quality level, meets customer use needs, and is also beneficial to improving the market competitiveness of the product.

Description

Technical Field

[0001] The invention relates to a winter performance test method for a passenger car traction control system (TCS). Background Art

[0002] Traction Control System is a control system that intervenes and controls the vehicle's braking force and engine output torque to prevent unacceptable slippage of the drive wheels during starting and acceleration, thereby improving the vehicle's traction performance and driving stability. The traction control system can not only improve the vehicle's driving stability, but also improve its acceleration and climbing ability. Especially on icy and snowy roads in winter, the friction coefficient is variable and the vehicle is not easy to control, so the traction control system is particularly important. A winter performance test method for a passenger car traction control system (TCS) can test the various parameters of the traction control system of a vehicle under typical use conditions on icy and snowy roads in winter to determine its performance, and has important engineering application value. In this way, the winter performance of the traction control system (TCS) can be detected before the new model is put into production, providing users with a safe driving experience. Summary of the invention

[0003] The object of the present invention is to provide a winter performance test method for a passenger car traction control system (TCS), which can effectively test winter performance parameters of the traction control system (TCS) and process test data.

[0004] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0006] A winter performance test method for a passenger car traction control system includes testing and data processing methods for five working conditions: stationary straight-line acceleration on a uniform road surface, stationary straight-line acceleration on a butted road surface, stationary straight-line acceleration on an open road surface, stationary climbing on an open ramp, and extreme acceleration on a circular ring, to examine the winter performance of a passenger car traction control system.

[0007] Furthermore, the static linear acceleration on the uniform road surface is:

[0008] In both TCS On and Off modes, the vehicle accelerates at full throttle from a standstill on a uniform road surface, and steering corrections are allowed during acceleration;

[0009] TCS On mode: The accelerator pedal is used for full throttle acceleration. For manual transmission, start from 1st gear, and the engine speed when engaging the clutch is controlled to the point where the drive wheels just slip and the TCS system is triggered, but the maximum speed should not exceed 4000r / min for gasoline vehicles and 3000r / min for diesel vehicles. For automatic transmission, start from D gear and quickly move your foot from the brake pedal to the accelerator pedal for full throttle acceleration.

[0010] TCS Off mode: The accelerator pedal is operated in the best throttle control mode; for manual transmission, it starts from 1st gear; for automatic transmission, it starts from D gear; during acceleration, the drive wheels are always in the best slip state to obtain the best acceleration performance;

[0011] For manual transmissions, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, distance, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process.

[0012] Furthermore, the stationary straight-line acceleration of the docking road surface includes transitioning from an asphalt or concrete road surface to a polished ice surface, and from a polished ice surface to an asphalt or concrete road surface;

[0013] Transitioning from asphalt or concrete to polished ice:

[0014] In TCS On mode, the vehicle starts from rest and accelerates at full throttle from asphalt or concrete road to polished ice surface. At the beginning, the front of the vehicle is 1 meter away from the polished ice surface, and the test ends when the acceleration reaches 30km / h. Steering correction is allowed during acceleration. For manual transmission, the transmission gear is in 1st gear; for automatic transmission, the transmission gear is in D gear. For manual transmission, gears are changed when the engine speed reaches the rated power speed during acceleration, and the time history of vehicle speed, acceleration, yaw angular velocity, and wheel speed during the entire acceleration process is recorded.

[0015] Transitioning from polished ice to asphalt or concrete:

[0016] In TCS On mode, the vehicle starts from rest and accelerates at full throttle from the polished ice surface to the asphalt or concrete road surface. At the beginning, the front of the vehicle is 1 meter away from the asphalt or concrete road surface, and the test ends when the acceleration reaches 30km / h. Steering correction is allowed during acceleration. For manual transmission, the transmission gear is in 1st gear; for automatic transmission, the transmission gear is in D gear during acceleration. For manual transmission, the gear is changed when the engine speed reaches the rated power speed during acceleration, and the time history of vehicle speed, acceleration, yaw angular velocity, and wheel speed during the entire acceleration process is recorded.

[0017] The stationary straight-line acceleration on the open road:

[0018] In TCS On mode, the vehicle is stationary on a split road with one wheel on the asphalt or concrete road and the other wheel on the polished ice, and then starts accelerating at full throttle to 50km / h; for manual transmission, start from 1st gear, and control the engine speed when engaging the clutch at the start just enough to cause the drive wheels to slip and trigger the TCS system, but the maximum speed should not exceed 4000r / min for gasoline vehicles and 3000r / min for diesel vehicles; for automatic transmission, quickly move your foot from the brake pedal to the accelerator pedal when starting from D gear to accelerate at full throttle; for manual transmission, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, distance, acceleration, yaw angular velocity, wheel speed, and steering wheel angle during the entire acceleration process.

[0019] Furthermore, the stationary climbing of the split ramp includes a forward mode and a reverse mode;

[0020] Forward Mode:

[0021] In TCS On mode, the vehicle stops in the forward direction on a ramp, with one wheel on the asphalt or concrete road surface and the other wheel on the polished ice surface. Start with full throttle acceleration until you reach the top of the slope. Steering correction is allowed during acceleration. For manual transmission, start from 1st gear, control the accelerator and clutch pedals to make the vehicle ready to start, release the brake and fully press the accelerator pedal and engage the clutch to start climbing. For automatic transmission, start from D gear, and quickly switch your foot from the brake pedal to the accelerator pedal. Record the time history of vehicle speed, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process. For vehicles in two-wheel drive mode, the slope is 15%; for vehicles in four-wheel drive mode, the slope is 20%.

[0022] Reverse mode: The test method is the same as the forward mode.

[0023] Furthermore, the ring is driven at the limit acceleration:

[0024] The vehicle is accelerated from rest on a uniform circular track with a diameter greater than or equal to 100m and a width of 3.5m to the highest stable driving speed that the vehicle can stably maintain on the specified track; the test is carried out in two modes, TCS On and Off. When TCS is On, the driver tries to accelerate with full throttle; when TCS is Off, the driver accelerates with the best throttle control method; the time history of vehicle speed, yaw rate, longitudinal acceleration, lateral acceleration, steering wheel angle, and sideslip angle during the entire acceleration process is recorded; the test is carried out twice to the left and twice to the right; the test should be carried out on polished ice, compacted snow and asphalt roads respectively.

[0025] Furthermore, in the case of a static straight-line acceleration test on a uniform road surface, the data processing method is:

[0026] Acceleration time: Calculate the time required for the vehicle to accelerate from rest to the specified speed in each test, and calculate the average value of three tests;

[0027] Acceleration distance: Calculate the distance traveled by the vehicle from rest to the specified speed in each test, and calculate the average value of three tests;

[0028] Average acceleration: The average acceleration is calculated as follows, and the average value of three tests is calculated;

[0029] a=V 2 / (25.92×S)………………………………①

[0030] Where:

[0031] a——average acceleration and deceleration, in meters per second 2 ;

[0032] V——acceleration end speed, in kilometers per hour;

[0033] S——acceleration distance, in meters;

[0034] Maximum yaw rate: Calculate the maximum absolute value of the yaw rate during the acceleration period of each test and find the average value of the three tests;

[0035] Maximum change in yaw rate: Calculate the difference between the maximum and minimum yaw rate during each test acceleration, and find the average value of three tests;

[0036] Maximum steering wheel angle: Calculate the maximum steering wheel angle during each test acceleration and find the average value of three tests;

[0037] Total steering wheel angle: Calculate the total steering wheel angle during each test acceleration and find the average value of three tests;

[0038] The ratio of TCS On and Off acceleration time, TR, is calculated as follows:

[0039] TR=t xm / t BE ×100%………………………………②

[0040] Where:

[0041] TR——ratio of TCS On and Off acceleration time;

[0042] t xm ——Acceleration time when TCS is On, in seconds;

[0043] t BE ——The shortest acceleration time that an experienced driver can achieve with his best effort when TCS is off, in seconds.

[0044] Furthermore, in the case of a stationary straight-line acceleration test on a docking road, the data processing method is:

[0045] (1) Transition from asphalt or concrete pavement to polished ice

[0046] Maximum yaw rate: After the driving wheel transitions to the polished ice surface, calculate the maximum absolute value of the yaw rate during the acceleration period of each test, and calculate the average value of the three tests;

[0047] Maximum change in yaw rate: After the driving wheel transitions to the polished ice surface, calculate the difference between the maximum and minimum yaw rate during each test acceleration period, and calculate the average of three tests;

[0048] Maximum steering wheel angle: After the driving wheel transitions to the polished ice surface, calculate the maximum steering wheel angle during each test acceleration and find the average of three tests;

[0049] Total steering wheel angle: After the driving wheel transitions to the polished ice surface, calculate the total steering wheel angle during each test acceleration and find the average of three tests;

[0050] (2) Transition from polished ice to asphalt or concrete

[0051] The time it takes for the acceleration of the driving wheel to rise to 90% of the average acceleration of the asphalt or concrete road surface after the driving wheel transitions to the asphalt or concrete road surface;

[0052] Calculate the time required for each test from the time the driving wheel contacts the asphalt or concrete road surface to the time when the instantaneous acceleration reaches 90% of the average acceleration of the asphalt or concrete road surface, and calculate the average value of the three tests;

[0053] Average acceleration from the time the drive wheels transition to asphalt or concrete road surface until the vehicle speed reaches 50 km / h

[0054] Calculate the average acceleration from the time the driving wheel touches the asphalt or concrete road surface to the time the vehicle speed reaches 50 km / h in each test using the following formula ③, and calculate the average value of the three tests;

[0055] a=(V2 2 -V1 2 ) / (25.92×S)………………………………③

[0056] Where:

[0057] a——average acceleration and deceleration, in meters per second 2 ;

[0058] V1 – vehicle speed when the driving wheels touch the asphalt or concrete road surface, in kilometers per hour;

[0059] V2——vehicle speed reaches 50, in kilometers per hour;

[0060] S——The distance traveled from the time the driving wheel touches the asphalt or concrete road surface to the time the vehicle speed reaches 50 km / h, in meters;

[0061] Maximum yaw rate: After the driving wheel transitions to the asphalt or concrete road surface, calculate the maximum absolute value of the yaw rate during each test acceleration period and calculate the average value of three tests;

[0062] Maximum change in yaw rate: After the driving wheels transition to the asphalt or concrete road surface, calculate the difference between the maximum and minimum yaw rate during each test acceleration period, and calculate the average value of the three tests.

[0063] Maximum steering wheel angle: After the driving wheel transitions to the asphalt or concrete road surface, calculate the maximum steering wheel angle during each test acceleration and find the average value of three tests;

[0064] Total steering wheel angle: After the driving wheel transitions to the asphalt or concrete road surface, calculate the total steering wheel angle during each test acceleration and find the average value of the three tests.

[0065] Furthermore, in the case of a static straight-line acceleration test on an open road, the data processing method is:

[0066] Acceleration time: Calculate the time required for the vehicle to accelerate from rest to 50 km / h in each test, and calculate the average value of three tests;

[0067] Acceleration distance: Calculate the distance traveled by the vehicle from rest to 50 km / h in each test, and calculate the average value of three tests;

[0068] Average acceleration: Calculate the average acceleration of each test according to formula ①, and find the average value of three tests, retaining two decimal places;

[0069] Slip time of the driving wheel on the polished ice side: calculate the longest slip time of the driving wheel on the polished ice side after starting, and calculate the average value of three tests;

[0070] Maximum yaw rate: Calculate the maximum absolute value of the yaw rate during the acceleration period of each test and find the average value of the three tests;

[0071] Maximum change in yaw rate: Calculate the difference between the maximum and minimum yaw rate during each test acceleration, and find the average value of three tests;

[0072] Maximum steering wheel angle: Calculate the maximum steering wheel angle during acceleration for each test and find the average value of three tests;

[0073] Total steering wheel angle: Calculate the total steering wheel angle during each test acceleration and find the average value of three tests;

[0074] Maximum steering wheel angle speed: Calculate the total steering wheel angle during acceleration for each test and find the average of the three tests.

[0075] Furthermore, in the case of a stationary climbing test on an open ramp, the data processing method is:

[0076] Time for the vehicle to reach a speed of 5 km / h: Calculate the time required for the vehicle to accelerate from rest to 5 km / h in each test, and calculate the average of the three tests;

[0077] Time for the vehicle speed to reach 15 km / h: Calculate the time required for the vehicle to accelerate from rest to 15 km / h in each test, and find the average value of the three tests;

[0078] Acceleration distance: Calculate the distance traveled by the vehicle from rest to 15 km / h in each test, and calculate the average value of three tests;

[0079] Average acceleration: Calculate the average acceleration during each test acceleration according to formula ①, and find the average value of three tests;

[0080] Maximum yaw rate: Calculate the maximum absolute value of the yaw rate during the acceleration period of each test and find the average value of the three tests;

[0081] Maximum change in yaw rate: Calculate the difference between the maximum and minimum yaw rate during each test acceleration, and find the average value of three tests;

[0082] Maximum steering wheel angle: Calculate the maximum absolute value of the yaw rate during each test acceleration and find the average value of three tests;

[0083] Total steering wheel angle: Calculate the total steering wheel angle during each test acceleration and find the average value of three tests;

[0084] Slip time of the driving wheel on the polished ice side: calculate the longest slip time of the driving wheel on the polished ice side after starting, and calculate the average value of three tests;

[0085] Maximum steering wheel angular velocity: Calculate the maximum absolute value of the steering wheel angular velocity during each test acceleration, and find the average value of the three tests;

[0086] Reverse displacement: Calculate the vehicle's reverse displacement after starting and find the average value of three tests.

[0087] Furthermore, in the case of the ring extreme acceleration driving condition test, the data processing method is:

[0088] Maximum stable driving speed: Calculate the maximum speed that can be driven in a steady circular motion on the specified runway in each direction for each test in TCS On and Off modes, and calculate the average of the two tests;

[0089] Ratio of the maximum stable driving speeds when TCS is On and Off: Calculate the ratio of the maximum stable driving speeds when TCS is On and Off according to the following formula ④.

[0090] r v =V TCS On / V TCS Off ………………………………④

[0091] Where:

[0092] r v ——The ratio of the maximum stable driving speed when TCS is On and Off, retaining two decimal places;

[0093] V TCS On ——The maximum steady-state driving speed when TCS is on, in kilometers per hour;

[0094] V TCS Off ——The maximum steady-state driving speed when TCS is off, in kilometers per hour;

[0095] Maximum change in yaw rate during steady-state driving: Calculate the maximum change in yaw rate during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests;

[0096] Maximum change of steering wheel angle during steady-state driving: Calculate the maximum change of steering wheel angle during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests;

[0097] Maximum steering wheel angular velocity during steady-state driving: Calculate the maximum steering wheel angular velocity during steering correction during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests;

[0098] Maximum change in sideslip angle during steady-state driving: Calculate the maximum change in sideslip angle during steady-state circular driving on the specified track for each direction and each test, and calculate the average value of the two tests.

[0099] Compared with the prior art, the present invention has the following beneficial effects:

[0100] The winter performance test of the traction control system (TCS) provided by the present invention can effectively simulate the actual use of the user by testing the sample vehicle, detect the performance parameters of the vehicle traction control system under different working conditions, and find the inherent defects, production defects or design defects of the traction control system. This provides a basis for the development of high-quality samples for the product, so that the product has a higher quality level and meets the use needs of customers, and is also beneficial to improving the market competitiveness of the product. DETAILED DESCRIPTION

[0101] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention is described in more detail. The described embodiment is a part of the embodiment of the present invention, rather than all the embodiments. The following embodiments are exemplary and are intended to be used to explain the present invention, but cannot be understood as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below.

[0102] The present invention is described in detail below:

[0103] The testing method of the present invention includes testing and data processing methods for five working conditions, namely, stationary straight-line acceleration on uniform road surface, stationary straight-line acceleration on butted road surface, stationary straight-line acceleration on open road surface, stationary climbing on open ramp, and circular extreme acceleration driving, which can effectively examine the winter performance of passenger car traction control system (TCS).

[0104] 1. Test conditions

[0105] 1.1 Straight-line acceleration from rest on a uniform road surface

[0106] In both TCS On and Off modes, the vehicle starts at rest on a uniform road surface and accelerates at full throttle to the speed specified in Table 1. Steering corrections are allowed during acceleration.

[0107] TCS On mode: The accelerator pedal is operated at full throttle. For manual transmission, start from 1st gear, and the engine speed when engaging the clutch is controlled to the point where the drive wheels just slip and the TCS system is triggered, but the maximum speed should not exceed 4000r / min (gasoline vehicle) or 3000r / min (diesel vehicle); for automatic transmission, start from D gear, and quickly move your foot from the brake pedal to the accelerator pedal for full throttle acceleration.

[0108] TCS Off mode: The accelerator pedal adopts the best throttle control operation mode. For manual transmission, start from 1st gear; for automatic transmission, start from D gear. During acceleration, the drive wheels are always in the best slip state to obtain the best acceleration performance.

[0109] For manual transmissions, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, distance, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process.

[0110] Table 1. Static linear acceleration conditions on uniform road surface

[0111]

[0112] 1.2 Straight-line acceleration from stationary position on the road

[0113] 1.2.1 Transition from asphalt or concrete to polished ice

[0114] In TCS On mode, the vehicle starts from a standstill and accelerates at full throttle from asphalt or concrete road to polished ice surface. At the beginning, the front of the vehicle is 1 meter away from the polished ice surface. The test ends when the vehicle accelerates to 30km / h. Steering correction is allowed during acceleration. For manual transmission, the transmission gear is in 1st gear; for automatic transmission, the transmission gear is in D gear. For manual transmission, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, acceleration, yaw rate, and wheel speed during the entire acceleration process. A total of three tests were conducted.

[0115] 1.2.2 Transition from polished ice to asphalt or concrete

[0116] In TCS On mode, the vehicle starts from a standstill and accelerates at full throttle from a polished ice surface to an asphalt or concrete road surface. At the beginning, the front of the vehicle is 1 meter away from the asphalt or concrete road surface. The test ends when the vehicle accelerates to 30 km / h. Steering corrections are allowed during acceleration. For manual transmissions, the transmission gear is in 1st gear; for automatic transmissions, the transmission gear is in D gear during acceleration. For manual transmissions, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, acceleration, yaw rate, and wheel speed during the entire acceleration process. A total of three tests were conducted.

[0117] 1.3 Straight-line acceleration from a standstill on an open road

[0118] In TCS On mode, the vehicle is stationary on a split road, with one wheel on the asphalt or concrete road and one wheel on the polished ice, and starts accelerating at full throttle to 50km / h. For manual transmission, start from 1st gear, and control the engine speed when engaging the clutch at the start to just cause the drive wheels to slip and trigger the TCS system, but the maximum should not exceed 4000r / min (gasoline vehicle) or 3000r / min (diesel vehicle); for automatic transmission, start from D gear and quickly move the foot from the brake pedal to the accelerator pedal to accelerate at full throttle. For manual transmission, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, distance, acceleration, yaw angular velocity, wheel speed, and steering wheel angle during the entire acceleration process. A total of three tests were conducted.

[0119] 1.4 Stationary climbing on a ramp

[0120] 1.4.1 Forward Mode

[0121] In TCS On mode, the vehicle is stopped on a ramp in the forward direction, with one wheel on the asphalt or concrete road surface and one wheel on the polished ice surface. The vehicle starts with full throttle acceleration until it reaches the top of the slope. Steering correction is allowed during acceleration. For manual transmission, start from 1st gear, control the accelerator and clutch pedals to make the vehicle ready to start, release the brake and fully press the accelerator pedal and engage the clutch to start climbing; for automatic transmission, start from D gear, and quickly switch the foot from the brake pedal to the accelerator pedal. Record the time history of vehicle speed, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process. The test is carried out three times. For vehicles in two-wheel drive mode, the slope is 15%; for vehicles in four-wheel drive mode, the slope is 20%.

[0122] 1.4.2 Fallback Mode

[0123] The test method is the same as the forward mode.

[0124] 1.5 Ring extreme acceleration driving

[0125] The vehicle accelerates from rest to the highest stable driving speed that the vehicle can stably maintain on the specified track on a uniform circular surface runway with a diameter greater than or equal to 100m and a width of 3.5m. The test is carried out in two modes, TCS On and Off. When TCS is On, the driver tries to accelerate with full throttle; when TCS is Off, the driver accelerates with the best throttle control. The time history of vehicle speed, yaw rate, longitudinal acceleration, lateral acceleration, steering wheel angle, and sideslip angle during the entire acceleration process is recorded. The test is carried out twice to the left and right.

[0126] The tests should be carried out on polished ice surface, compacted snow surface and asphalt road surface respectively.

[0127] 2. Data processing

[0128] 2.1 Straight-line acceleration from rest on uniform road surface

[0129] 2.1.1 Acceleration time

[0130] Calculate the time required for the vehicle to accelerate from rest to the specified speed for each test, and find the average value of the three tests, retaining one decimal place.

[0131] 2.1.2 Acceleration distance

[0132] Calculate the distance the vehicle travels from rest to the specified speed in each test, and find the average value of the three tests, retaining one decimal place.

[0133] 2.1.3 Average acceleration

[0134] The formula for calculating the average acceleration is as follows, and the average value of three tests is calculated with two decimal places.

[0135] a=V 2 / (25.92×S)………………………………①

[0136] Where:

[0137] a——average acceleration and deceleration, in meters per second 2 (m / s 2 ), keep two decimal places;

[0138] V——Acceleration end speed, in kilometers per hour (km / h), with one decimal place reserved;

[0139] S——Acceleration distance, in meters (m), with one decimal place.

[0140] 2.1.4 Maximum yaw rate

[0141] Calculate the maximum absolute value of the yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining two decimal places.

[0142] 2.1.5 Maximum change of yaw rate

[0143] Calculate the difference between the maximum and minimum yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining two decimal places.

[0144] 2.1.6 Maximum steering wheel angle

[0145] Calculate the maximum steering wheel angle during each test acceleration and find the average of the three tests, retaining one decimal place.

[0146] 2.1.7 Total steering wheel angle

[0147] Calculate the total steering wheel angle during each test acceleration and find the average of the three tests to one decimal place.

[0148] 2.1.8 TCS On and Off acceleration time ratio TR

[0149] The calculation formula for the ratio TR of TCS On and Off acceleration time is as follows:

[0150] TR=t xm / t BE ×100%………………………………②

[0151] Where:

[0152] TR——The ratio of TCS On and Off acceleration time, rounded to the integer;

[0153] t xm ——Acceleration time when TCS is on, in seconds (s), with one decimal place reserved;

[0154] t BE ——The shortest acceleration time that an experienced driver can achieve with his best effort when TCS is off, in seconds (s), with one decimal place.

[0155] 2.2 Straight-line acceleration from stationary position on the road

[0156] 2.2.1 Transition from asphalt or concrete to polished ice

[0157] 2.2.1.1 Maximum yaw rate

[0158] After the driving wheel transitions to the polished ice surface, calculate the maximum absolute value of the yaw angular velocity during the acceleration of each test, and find the average value of the three tests with two decimal places.

[0159] 2.2.1.2 Maximum change of yaw rate

[0160] After the driving wheel transitions to the polished ice surface, calculate the difference between the maximum and minimum yaw angular velocity during the acceleration of each test, and find the average value of the three tests, retaining two decimal places.

[0161] 2.2.1.3 Maximum steering wheel angle

[0162] After the driving wheel transitions to the polished ice surface, calculate the maximum steering wheel angle during the acceleration of each test, and find the average of three tests with one decimal place.

[0163] 2.2.1.4 Total steering wheel angle

[0164] After the driving wheel transitions to the polished ice surface, calculate the total steering wheel angle during the acceleration of each test and find the average of three tests to one decimal place.

[0165] 2.2.2 Transition from polished ice to asphalt or concrete

[0166] 2.2.2.1 The time it takes for the acceleration of the driving wheel to rise to 90% of the average acceleration of the asphalt or concrete road surface after the driving wheel transitions to the asphalt or concrete road surface

[0167] Calculate the time required for each test from the time the driving wheel contacts the asphalt or concrete pavement to the time when the instantaneous acceleration reaches 90% of the average acceleration of the asphalt or concrete pavement, and calculate the average value of the three tests, retaining one decimal place.

[0168] 2.2.2.2 Average acceleration from the time the drive wheels transition to the asphalt or concrete road surface until the vehicle speed reaches 50 km / h

[0169] Calculate the average acceleration of each test from the time the driving wheel contacts the asphalt or concrete road surface to the time the vehicle speed reaches 50 km / h using the following formula ③, and find the average value of the three tests, retaining two decimal places.

[0170] a=(V2 2 -V1 2 ) / (25.92×S)……………………………③

[0171] Where:

[0172] a——average acceleration and deceleration, in meters per second 2 (m / s 2 ), keep two decimal places;

[0173] V1——vehicle speed when the driving wheel contacts the asphalt or concrete road surface, in kilometers per hour (km / h), with one decimal place;

[0174] V2——vehicle speed reaches 50, in kilometers per hour (km / h), with one decimal place;

[0175] S - the distance traveled from the time the driving wheel contacts the asphalt or concrete road surface to the time the vehicle speed reaches 50 km / h, in meters (m), with one decimal place.

[0176] 2.2.2.3 Maximum yaw rate

[0177] After the driving wheel transitions to the asphalt or concrete road surface, calculate the maximum absolute value of the yaw angular velocity during each test acceleration, and find the average value of three tests with two decimal places.

[0178] 2.2.2.4 Maximum change in yaw rate

[0179] After the driving wheel transitions to the asphalt or concrete road surface, calculate the difference between the maximum and minimum yaw angular velocity during each test acceleration period, and find the average value of the three tests, retaining two decimal places.

[0180] 2.2.2.5 Maximum steering wheel angle

[0181] After the driving wheel transitions to the asphalt or concrete road surface, calculate the maximum steering wheel angle during each test acceleration, and find the average value of three tests, retaining one decimal place.

[0182] 2.2.2.6 Total steering wheel angle

[0183] After the driving wheel transitions to the asphalt or concrete road surface, calculate the total steering wheel angle during each test acceleration and find the average of three tests with one decimal place.

[0184] 2.3 Straight-line acceleration from a standstill on an open road

[0185] 2.3.1 Acceleration time

[0186] Calculate the time required for the vehicle to accelerate from a standstill to a speed of 50 km / h in each test, and find the average value of the three tests, retaining one decimal place.

[0187] 2.3.2 Acceleration distance

[0188] Calculate the distance traveled by the vehicle from rest to a speed of 50 km / h in each test, and find the average value of the three tests, retaining one decimal place.

[0189] 2.3.3 Average acceleration

[0190] Calculate the average acceleration of each test according to formula ①, and find the average value of three tests, retaining two decimal places.

[0191] 2.3.4 Driving wheel slip time on polished ice surface

[0192] Calculate the longest slip time of the driving wheel on the polished ice side after starting, and find the average value of three tests, retaining one decimal place.

[0193] 2.3.5 Maximum yaw rate

[0194] Calculate the maximum absolute value of the yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining two decimal places.

[0195] 2.3.6 Maximum change in yaw rate

[0196] Calculate the difference between the maximum and minimum yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining two decimal places.

[0197] 2.3.7 Maximum steering wheel angle

[0198] Calculate the maximum steering wheel angle during acceleration for each test and find the average of the three tests to one decimal place.

[0199] 2.3.8 Total steering wheel angle

[0200] Calculate the total steering wheel angle during each test acceleration and find the average of the three tests to one decimal place.

[0201] 2.3.9 Maximum steering wheel angular speed

[0202] Calculate the total steering wheel angle during each test acceleration and find the average of the three tests to one decimal place.

[0203] 2.4 Climbing a ramp from a stationary position

[0204] 2.4.1 Time for the vehicle speed to reach 5 km / h

[0205] Calculate the time required for the vehicle to accelerate from rest to 5 km / h in each test, and find the average of the three tests, retaining one decimal place.

[0206] 2.4.2 Time for vehicle speed to reach 15km / h

[0207] Calculate the time required for the vehicle to accelerate from rest to 15 km / h in each test, and find the average of the three tests, retaining one decimal place.

[0208] 2.4.3 Acceleration distance

[0209] Calculate the distance traveled by the vehicle from rest to 15 km / h in each test, and find the average value of the three tests, retaining one decimal place.

[0210] 2.4.4 Average acceleration

[0211] Calculate the average acceleration during each test acceleration according to formula ①, and find the average value of three tests, retaining two decimal places.

[0212] 2.4.5 Maximum yaw rate

[0213] Calculate the maximum absolute value of the yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining two decimal places.

[0214] 2.4.6 Maximum change in yaw rate

[0215] Calculate the difference between the maximum and minimum yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining two decimal places.

[0216] 2.4.7 Maximum steering wheel angle

[0217] Calculate the maximum absolute value of the yaw angular velocity during each test acceleration, and find the average value of the three tests, retaining one decimal place.

[0218] 2.4.8 Total steering wheel angle

[0219] Calculate the total steering wheel angle during each test acceleration and find the average of the three tests to one decimal place.

[0220] 2.4.9 Driving wheel slip time on polished ice surface

[0221] Calculate the longest slip time of the driving wheel on the polished ice side after starting, and find the average value of three tests, retaining one decimal place.

[0222] 2.4.10 Maximum steering wheel angular speed

[0223] Calculate the maximum absolute value of the steering wheel angular velocity during each test acceleration, and find the average value of the three tests, retaining one decimal place.

[0224] 2.4.11 Backward displacement

[0225] Calculate the vehicle's backward displacement after starting, and find the average value of three tests, retaining one decimal place.

[0226] 2.5 Ring extreme acceleration driving

[0227] 2.5.1 Maximum stable driving speed

[0228] Calculate the maximum speed at which the vehicle can perform steady-state circular driving on the specified runway in each direction and each test in TCS On and Off modes, and calculate the average of the two tests, retaining one decimal place.

[0229] 2.5.2 Ratio of maximum stable driving speed when TCS is On and Off

[0230] Calculate the ratio of the maximum stable driving speed when TCS is On and Off using the following formula ④.

[0231] r v =V TCS On / V TCS Off …………………………④

[0232] Where:

[0233] r v ——The ratio of the maximum stable driving speed when TCS is On and Off, retaining two decimal places;

[0234] V TCS On ——The maximum steady-state driving speed when TCS is on, in kilometers per hour (km / h), with one decimal place;

[0235] V TCS Off ——The maximum steady-state driving speed when TCS is Off, in kilometers per hour (km / h), with one decimal place.

[0236] 2.5.3 Maximum change in yaw rate during steady-state driving

[0237] Calculate the maximum change in yaw rate (the difference between adjacent crests and troughs) during steady-state circular driving on the specified track in each direction and each test, and find the average value of the two tests, retaining two decimal places.

[0238] 2.5.4 Maximum change in steering wheel angle during steady-state driving

[0239] Calculate the maximum change in steering wheel angle (the difference between adjacent crests and troughs) during steady-state circular driving on the specified track in each direction and each test, and find the average value of the two tests, retaining one decimal place.

[0240] 2.5.5 Maximum steering wheel angular velocity during steady-state driving

[0241] Calculate the maximum steering wheel angular velocity during steering correction during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests, retaining one decimal place.

[0242] 2.5.6 Maximum change of sideslip angle during steady-state driving

[0243] Calculate the maximum change in sideslip angle (the difference between adjacent crests and troughs) during steady-state circular driving on the specified runway in each direction and each test, and find the average value of the two tests, retaining one decimal place.

[0244] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A winter performance test method for a passenger car traction control system, characterized in that: The test and data processing methods of five working conditions, including stationary straight-line acceleration on uniform road surface, stationary straight-line acceleration on butted road surface, stationary straight-line acceleration on split road surface, stationary climbing on split ramp, and extreme acceleration on a circle, are used to examine the winter performance of the traction control system of passenger cars. The static linear acceleration on the uniform road surface: In both TCS On and Off modes, the vehicle accelerates at full throttle from a standstill on a uniform road surface, and steering corrections are allowed during acceleration; TCS On mode: The accelerator pedal is used for full throttle acceleration. For manual transmission, start from 1st gear, and the engine speed when engaging the clutch is controlled to the point where the drive wheels just slip and the TCS system is triggered, but the maximum speed should not exceed 4000r / min for gasoline vehicles and 3000r / min for diesel vehicles. For automatic transmission, start from D gear and quickly move your foot from the brake pedal to the accelerator pedal for full throttle acceleration. TCS Off mode: The accelerator pedal adopts the best throttle control operation mode; for manual transmission, start from 1st gear; for automatic transmission, start from D gear; During acceleration, the driving wheels are always in the best slip state to obtain the best acceleration performance; For manual transmissions, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, distance, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process; The stationary straight-line acceleration of the docking road surface includes transitioning from an asphalt or concrete road surface to a polished ice surface, and from a polished ice surface to an asphalt or concrete road surface; Transitioning from asphalt or concrete to polished ice: In TCS On mode, the vehicle starts from rest and accelerates at full throttle from asphalt or concrete road to polished ice surface. At the beginning, the front of the vehicle is 1 meter away from the polished ice surface, and the test ends when the acceleration reaches 30km / h. Steering correction is allowed during acceleration. For manual transmission, the transmission gear is in 1st gear; for automatic transmission, the transmission gear is in D gear. For manual transmission, gears are changed when the engine speed reaches the rated power speed during acceleration, and the time history of vehicle speed, acceleration, yaw angular velocity, and wheel speed during the entire acceleration process is recorded. Transitioning from polished ice to asphalt or concrete: In TCS On mode, the vehicle starts from rest and accelerates at full throttle from the polished ice surface to the asphalt or concrete road surface. At the beginning, the front of the vehicle is 1 meter away from the asphalt or concrete road surface, and the test ends when the acceleration reaches 30km / h. Steering correction is allowed during acceleration. For manual transmission, the transmission gear is in 1st gear; for automatic transmission, the transmission gear is in D gear during acceleration. For manual transmission, the gear is changed when the engine speed reaches the rated power speed during acceleration, and the time history of vehicle speed, acceleration, yaw angular velocity, and wheel speed during the entire acceleration process is recorded. The stationary straight-line acceleration on the open road: In TCS On mode, the vehicle is stationary on a split road, with one wheel on the asphalt or concrete road and the other on the polished ice, and the vehicle is accelerated to 50 km / h at full throttle. For manual transmission, start from 1st gear, and the engine speed when engaging the clutch at start is controlled to just enough to cause the drive wheels to slip and trigger the TCS system, but the maximum speed should not exceed 4000r / min for gasoline vehicles and 3000r / min for diesel vehicles. For automatic transmission, the foot is quickly moved from the brake pedal to the accelerator pedal from D gear to accelerate at full throttle. For manual transmissions, shift gears when the engine speed reaches the rated power speed during acceleration, and record the time history of vehicle speed, distance, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process; The stationary climbing of the split ramp includes a forward mode and a reverse mode; Forward Mode: In TCS On mode, the vehicle stops in the forward direction on a ramp, with one wheel on the asphalt or concrete road surface and the other wheel on the polished ice surface. Start with full throttle acceleration until you reach the top of the slope. Steering correction is allowed during acceleration. For manual transmission, start from 1st gear, control the accelerator and clutch pedals to make the vehicle ready to start, release the brake and fully press the accelerator pedal and engage the clutch to start climbing. For automatic transmission, start from D gear, and quickly switch your foot from the brake pedal to the accelerator pedal. Record the time history of vehicle speed, acceleration, yaw rate, wheel speed, and steering wheel angle during the entire acceleration process. For vehicles in two-wheel drive mode, the slope is 15%; for vehicles in four-wheel drive mode, the slope is 20%. Reverse mode: The test method is the same as the forward mode; The ring is driven at the limit of acceleration: The vehicle accelerates from rest to the highest stable driving speed that the vehicle can stably maintain on the specified runway on a uniform circular road runway with a diameter greater than or equal to 100m and a width of 3.5m; the test is carried out in two modes, TCS On and Off. When TCS is On, the driver tries to accelerate with full throttle; when TCS is Off, the driver accelerates with the best throttle control method; the time history of vehicle speed, yaw rate, longitudinal acceleration, lateral acceleration, steering wheel angle, and sideslip angle during the entire acceleration process is recorded; the test is carried out twice to the left and right; the test should be carried out on polished ice, compacted snow, and asphalt roads respectively; In the case of a static straight-line acceleration test on a uniform road surface, the data processing method is as follows: Acceleration time: Calculate the time required for the vehicle to accelerate from rest to the specified speed in each test, and calculate the average value of three tests; Acceleration distance: Calculate the distance traveled by the vehicle from rest to the specified speed in each test, and calculate the average value of three tests; Average acceleration: The average acceleration is calculated as follows, and the average value of three tests is calculated; a= V 2 / (25.92×S)……………………………… ① Where: a——average acceleration and deceleration, in meters per second 2 ; V——acceleration end speed, in kilometers per hour; S——acceleration distance, in meters; Maximum yaw rate: Calculate the maximum absolute value of the yaw rate during the acceleration period of each test and find the average value of the three tests; Maximum change in yaw rate: Calculate the difference between the maximum and minimum yaw rate during each test acceleration, and find the average value of three tests; Maximum steering wheel angle: Calculate the maximum steering wheel angle during each test acceleration and find the average value of three tests; Total steering wheel angle: Calculate the total steering wheel angle during each test acceleration and find the average value of three tests; The ratio of TCS On and Off acceleration time, TR, is calculated as follows: T.R= t xm / t BE ×100%…………………………… ② Where: TR——ratio of TCS On and Off acceleration time; t xm ——Acceleration time when TCS is On, in seconds; t BE - The shortest acceleration time that an experienced driver can achieve with the best effort when TCS is off, in seconds; In the case of the stationary straight-line acceleration test on the docking road, the data processing method is as follows: (1) Transition from asphalt or concrete pavement to polished ice Maximum yaw rate: After the driving wheel transitions to the polished ice surface, calculate the maximum absolute value of the yaw rate during the acceleration period of each test, and calculate the average value of the three tests; Maximum change in yaw rate: After the driving wheel transitions to the polished ice surface, calculate the difference between the maximum and minimum yaw rate during each test acceleration period, and calculate the average of three tests; Maximum steering wheel angle: After the driving wheel transitions to the polished ice surface, calculate the maximum steering wheel angle during each test acceleration and find the average of three tests; Total steering wheel angle: After the driving wheel transitions to the polished ice surface, calculate the total steering wheel angle during each test acceleration and find the average of three tests; (2) Transition from polished ice to asphalt or concrete The time it takes for the acceleration of the driving wheel to rise to 90% of the average acceleration of the asphalt or concrete road surface after the driving wheel transitions to the asphalt or concrete road surface; Calculate the time required for each test from the time the driving wheel contacts the asphalt or concrete road surface to the time when the instantaneous acceleration reaches 90% of the average acceleration of the asphalt or concrete road surface, and calculate the average value of the three tests; Average acceleration from the time the drive wheels transition to asphalt or concrete road surface until the vehicle speed reaches 50 km / h Calculate the average acceleration from the time the driving wheel touches the asphalt or concrete road surface to the time the vehicle speed reaches 50 km / h in each test using the following formula ③, and calculate the average value of the three tests; a= (V2 2 -V1 2 ) / (25.92×S)……………………………… ③ Where: a——average acceleration and deceleration, in meters per second 2 ; V1 – vehicle speed when the driving wheels touch the asphalt or concrete road surface, in kilometers per hour; V2——vehicle speed reaches 50, in kilometers per hour; S——The distance traveled from the time the driving wheel touches the asphalt or concrete road surface to the time the vehicle speed reaches 50 km / h, in meters; Maximum yaw rate: After the driving wheel transitions to the asphalt or concrete road surface, calculate the maximum absolute value of the yaw rate during each test acceleration period and calculate the average value of three tests; Maximum change in yaw rate: After the driving wheel transitions to the asphalt or concrete road surface, calculate the difference between the maximum and minimum yaw rate during each test acceleration period, and calculate the average value of three tests; Maximum steering wheel angle: After the driving wheel transitions to the asphalt or concrete road surface, calculate the maximum steering wheel angle during each test acceleration and find the average value of three tests; Total steering wheel angle: After the driving wheel transitions to the asphalt or concrete road surface, calculate the total steering wheel angle during each test acceleration and find the average value of three tests; In the case of a static straight-line acceleration test on an open road, the data processing method is as follows: Acceleration time: Calculate the time required for the vehicle to accelerate from rest to 50 km / h in each test, and calculate the average value of three tests; Acceleration distance: Calculate the distance traveled by the vehicle from rest to 50 km / h in each test, and calculate the average value of three tests; Average acceleration: Calculate the average acceleration of each test according to formula ①, and find the average value of three tests, retaining two decimal places; Slip time of the driving wheel on the polished ice side: calculate the longest slip time of the driving wheel on the polished ice side after starting, and calculate the average value of three tests; Maximum yaw rate: Calculate the maximum absolute value of the yaw rate during the acceleration period of each test and find the average value of the three tests; Maximum change in yaw rate: Calculate the difference between the maximum and minimum yaw rate during each test acceleration, and find the average value of three tests; Maximum steering wheel angle: Calculate the maximum steering wheel angle during acceleration for each test and find the average value of three tests; Total steering wheel angle: Calculate the total steering wheel angle during each test acceleration and find the average value of three tests; Maximum steering wheel angular velocity: Calculate the total steering wheel angle during each test acceleration and find the average of three tests; In the case of a stationary climbing test on a split ramp, the data processing method is as follows: Time for the vehicle to reach a speed of 5 km / h: Calculate the time required for the vehicle to accelerate from rest to 5 km / h in each test, and calculate the average of the three tests; Time for the vehicle speed to reach 15 km / h: Calculate the time required for the vehicle to accelerate from rest to 15 km / h in each test, and find the average value of the three tests; Acceleration distance: Calculate the distance traveled by the vehicle from rest to 15 km / h in each test, and calculate the average value of three tests; Average acceleration: Calculate the average acceleration during each test acceleration according to formula ①, and find the average value of three tests; Maximum yaw rate: Calculate the maximum absolute value of the yaw rate during the acceleration period of each test and find the average value of the three tests; Maximum change in yaw rate: Calculate the difference between the maximum and minimum yaw rate during each test acceleration, and find the average value of three tests; Maximum steering wheel angle: Calculate the maximum absolute value of the yaw rate during each test acceleration and find the average value of three tests; Total steering wheel angle: Calculate the total steering wheel angle during each test acceleration and find the average value of three tests; Slip time of the driving wheel on the polished ice side: calculate the longest slip time of the driving wheel on the polished ice side after starting, and calculate the average value of three tests; Maximum steering wheel angular velocity: Calculate the maximum absolute value of the steering wheel angular velocity during each test acceleration, and find the average value of the three tests; Reverse displacement: Calculate the reverse displacement of the vehicle after starting, and find the average value of three tests; In the case of the ring extreme acceleration driving test, the data processing method is: Maximum stable driving speed: Calculate the maximum speed that can be driven in a steady circular motion on the specified runway in each direction for each test in TCS On and Off modes, and calculate the average of the two tests; Ratio of the maximum stable driving speed when TCS is On and Off: Calculate the ratio of the maximum stable driving speed when TCS is On and Off according to the following formula ④; r v =V TCSOn / V TCSOff …………………………④ Where: r v ——The ratio of the maximum stable driving speed when TCS is On and Off, retaining two decimal places; V TCSOn ——The maximum steady-state driving speed when TCS is on, in kilometers per hour; V TCSOff ——The maximum steady-state driving speed when TCS is off, in kilometers per hour; Maximum change in yaw rate during steady-state driving: Calculate the maximum change in yaw rate during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests; Maximum change of steering wheel angle during steady-state driving: Calculate the maximum change of steering wheel angle during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests; Maximum steering wheel angular velocity during steady-state driving: Calculate the maximum steering wheel angular velocity during steering correction during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests; Maximum change in sideslip angle during steady-state driving: Calculate the maximum change in sideslip angle during steady-state circular driving on the specified track in each direction and each test, and calculate the average value of the two tests.

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