CN110702428A - Method for detecting instantaneous braking performance of automobile during running - Google Patents
Method for detecting instantaneous braking performance of automobile during running Download PDFInfo
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- CN110702428A CN110702428A CN201911187578.1A CN201911187578A CN110702428A CN 110702428 A CN110702428 A CN 110702428A CN 201911187578 A CN201911187578 A CN 201911187578A CN 110702428 A CN110702428 A CN 110702428A
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- braking
- automobile
- deceleration
- brake
- xai
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
- G01L5/286—Measuring deceleration
Abstract
The method for detecting the instantaneous brake performance of the running of the automobile comprises the steps that a tester with a multi-dimensional acceleration sensor arranged on the automobile measures the brake deceleration Xa in the running direction, or reads the instantaneous speed from an OBD interface or a mobile phone interface of the automobile to calculate the Xa, the intersection point of a Xa deceleration increasing straight line and a horizontal straight line with Xa being 0 is calculated as the starting increasing time of the brake deceleration, n points adjacent to the maximum value of Xai are selected from sampling sections as detection sections, the average value of the detection sections Xai is used as the brake deceleration detection value Xj in the X direction, the average value of Yai of a plurality of points before the starting increasing time of the brake deceleration is used as the brake deceleration detection value Yj in the Y direction, the road slope angle B is obtained through conversion, the downward sliding force or the upward sliding resistance of the automobile on a slope is equivalently converted into the brake deceleration A, the equivalent brake deceleration Xd in the running direction of the automobile is Xj +/-A, the, the algebraic sum of the transverse displacement delta Si of all sampling intervals is the braking deviation Sz of the braking process.
Description
Technical Field
A method for detecting the instantaneous braking performance of automobile during running is characterized by that when the automobiles with different qualities are running on road and are braked by different operations, the braking speed, road slope angle and transverse braking acceleration in running direction are measured to detect the equivalent braking speed and braking deviation of automobile.
Background
The prior art uses the automobile road test to detect the service braking performance, which is to measure the braking distance or the average deceleration fully sent out of the automobile, the automobile safety inspection is usually to install a portable brake instrument on the automobile, the action switch of the portable brake instrument is arranged on the service brake pedal to be linked, when the pedal acts, a signal can be sent out to start the detection and the timing. After the automobile runs on the special road test runway and reaches the specified speed, the brake pedal is suddenly stepped to the bottom until the speed is 0, the average deceleration (MEDD), the brake coordination time, the initial brake speed and the brake stability which are fully transmitted by the automobile are measured, the brake stability is qualified that the automobile does not exceed the specified width range, the method is only suitable for inspection on the good road test runway, and is not suitable for detecting the instantaneous brake performance of the automobile running at different speeds under the conditions that the automobile runs on the road surface with any total mass and any gradient and the brake pedal is operated at will, the brake performance of the automobile is difficult to master at any time and the reduction degree of the brake performance is difficult to find, and the method for detecting the instantaneous brake performance of the automobile running can overcome.
Disclosure of Invention
The method for detecting the instantaneous braking performance of the automobile during running is characterized in that a tester of a three-dimensional acceleration sensor is adopted, the braking deceleration Xa in the running direction of the automobile is measured in the X direction, or the instantaneous speed is read from an OBD interface or a mobile phone interface of the automobile to calculate the braking deceleration Xa, the braking deceleration Ya in the vertical direction of the automobile is measured in the Y direction, the Ya can be calibrated and converted into a road slope angle B, the transverse acceleration of the automobile is measured in the Z direction, the braking deviation degree or the deviation amount is calculated, the tester of the three-dimensional acceleration sensor is installed on the automobile, and an action switch of the tester is not required to be installed on a running brake pedal.
The instantaneous deceleration values Xai, Yai and Zai of the automobile at the same moment are measured during the running process, when the Xai deceleration increasing rate is larger than or equal to the specified increasing rate or Xai is larger than or equal to the specified deceleration, the tester can automatically judge that the automobile is in the braking process, and the deceleration increasing rate can be 0.3m/s2/s～3.0m/s2Selected in the range of/s, the prescribed deceleration may be 0.3m/s2～3.0m/s2And selecting within the range. During braking, an intersection point of a deceleration increasing straight line and a horizontal straight line Xa equals 0 is calculated Xai as the moment when the braking deceleration starts to increase, the average value of Yai of a plurality of points before the moment is used as the deceleration detection value Yj in the Y direction, n points adjacent to the maximum value of Xai are selected as detection segments, and n is selected within the range of 1-10. The average value of the detection section Xai is used as the average value of the braking deceleration detection values Xj, Yai in the X direction to reflect the deceleration of the automobile in the vertical direction, the calibration angle converted by Yj is the road surface slope angle B, the downhill force or uphill resistance of the automobile on a slope is equivalently converted into the braking deceleration A, the whole automobile mass is m, the unit kg, the gravity acceleration is g, and the unit m/s2Mg × sinB is m × a, a is g × sinB, the equivalent braking deceleration Xd in the vehicle traveling direction is Xj ± a, a minus sign is taken when B is an uphill slope, a plus sign is taken when B is a downhill slope, and the tester gives an indication of Xd.
Setting the lateral displacement speed V of the vehicle at the moment when the braking deceleration begins to increase0Calculating the automobile transverse displacement delta Si of the detection value Zai in each sampling interval in the braking process, wherein the delta Si is Vi-1×Δt+0.5×Zai×Δt2，Vi＝Vi-1+ Zai × Δ t, the acceleration of the automobile in one direction is positive and the acceleration in the other direction is negative, the algebraic sum of the lateral displacement Δ Si of all sampling intervals is the braking deviation Sz of the braking process, and the tester prompts Sz or the maximum lateral acceleration.
The method for detecting the instantaneous braking performance of the automobile during running is a method for detecting the instantaneous braking performance of the automobile in various braking states on any road surface, and is characterized in that: the tester is provided with a three-dimensional acceleration sensor along with a vehicle, the X direction measures the braking deceleration Xa of the driving direction of the vehicle, or the instantaneous vehicle speed is read from the OBD interface or the mobile phone interface of the vehicle to calculate the braking deceleration Xa, the Y direction measures the braking deceleration Ya in the vertical direction of the vehicle, the Z direction measures the acceleration in the transverse direction of the vehicle, the vehicle measures the instantaneous deceleration values Xai, Yai and Zai at the same moment in the process of driving braking or parking braking needing to be stopped, and the tester passes through the deceleration valuesOr the automatic judgment of the deceleration increasing rate is a braking process, the intersection point of a deceleration increasing straight line and an Xa-0 horizontal straight line is calculated Xai as the starting increasing moment of the braking deceleration, the average value Yai of a plurality of points before the moment is used as a deceleration detection value Yj in the Y direction, n points adjacent to the maximum value Xai are selected as detection sections, the average value of the detection sections Xai is used as a braking deceleration detection value Xj in the X direction, the calibration angle converted from Yj is a road surface slope angle B, the down-sliding force or the up-slope resistance of the automobile on a slope is equivalently converted into a braking deceleration A, the equivalent braking deceleration Xd in the automobile driving direction is Xj +/-A, the subtraction sign is taken when B is an up slope, the addition sign is taken when B is a down slope, and the transverse displacement speed V of the automobile at the starting increasing moment of the braking deceleration is0When the braking deviation quantity is equal to 0, calculating the automobile transverse displacement delta Si of the detection value Zai of each sampling interval in the braking process, wherein the algebraic sum of the transverse displacements delta Si of all the sampling intervals in the braking process is the braking deviation quantity Sz; either setting Zai to zero measures Xd only or using Xa, Ya two-dimensional sensors to measure Xd only. The method for detecting the instantaneous braking performance of the automobile during running can detect the equivalent braking deceleration under the conditions of any speed, any brake pedal stroke, any loading mass, any brake pedal moving speed, any road gradient and any brake pedal stabilizing time, and has the following technical characteristics compared with the prior art.
(1) The intersection point of the deceleration increasing straight line and the horizontal straight line with Xa being 0 is calculated as the moment when the braking deceleration starts to increase without measuring the braking coordination time and arranging a brake pedal switch, and the calculation is accurate.
(2) The method is not limited to two detection states of no-load or full-load of the automobile, can be suitable for any loading state, is suitable for vehicle-mounted detection of various automobiles, measures and prompts brake parameters in the braking process of the automobile in running, and can also reflect the influence of the deviation of loading quality on braking deviation.
(3) The method is not limited by the conditions of a straight road surface and a braking deviation width line, can detect braking parameters on a road surface with any gradient, uses the equivalent braking deceleration in the uniform automobile running direction as the braking parameters, and uses Sz to reflect the braking deviation.
(4) The brake parameters can be detected at any brake pedal stroke, so that the brake pedal can be released from the initial brake speed to the speed of 0, and the brake deviation degree under the action of various high speeds and various partial brake forces in the process of brake force increase can be measured after the inching brake is applied and the service brake is performed.
(5) The average value of Yai at several points before the moment when the braking deceleration starts to increase is used as the braking deceleration detection value Yj in the Y direction, so that the error that the heavy load is advanced by Yai when the automobile is braked is avoided.
(6) The method is not limited by the initial braking speed, so that a driver can master whether the instantaneous braking performance of the automobile during running is normal at any time, and the braking parameters in different periods can be counted by storing the maximum values of Xd, Zj, Sz and the like of each day, so that the reduction degree of the braking performance of the automobile is judged, and accurate basis is provided for the maintenance, the evaluation and the like of the automobile.
Detailed Description
The specific implementation of the method for detecting the instantaneous braking performance of the automobile running is described by taking the example that a heavy load vehicle adopts the tester running braking of the three-dimensional acceleration sensor. The tester is horizontally installed in a cab, the three dimensions X, Y, Z respectively correspond to the driving direction, the vertical direction and the transverse direction of an automobile, or the instantaneous speed is read from an OBD interface or a mobile phone interface of the automobile to calculate the braking deceleration Xa, and Xai points with the maximum braking deceleration adjacent to n are taken as detection sections. When measuring instantaneous deceleration Xai greater than or equal to 1.0m/s2Then, the tester judges that the braking process is performed, and sets the average value of Yai at 5 points before the time when the braking deceleration starts to increase as the detected deceleration value Yj in the Y direction.
1. When the heavy load vehicle is travelling, the brake pedal is stepped on to the bottom and is released 2 seconds later, the maximum braking deceleration Xai, measured for the full load of the vehicle, is 5.91m/s2Taking the average value of 3 adjacent points of the maximum braking deceleration as Xj to be 5.66m/s2The average value of Yai at 5 points before the time point when the braking deceleration starts to increase is used as the braking deceleration detection value Yj in the Y direction, the road surface gradient angle B converted from Yj is 3.2 °, B is an uphill slope, a is 9.8 × sin3.2 is 0.547, and the equivalent braking deceleration Xd is Xd-a is 5.66-0.547 is 5.113m/s2. Setting the lateral displacement speed V of the vehicle at the moment when the braking deceleration begins to increase0When the sum of the lateral displacement Δ Si in all sampling intervals is 0, the braking deviation Sz in the braking process is 0.206m, and the braking deviation Sz can be used as a safety brake check before driving.
2. When the truck brakes at the point where the shorter brake pedal stroke settling time is lower, if Xai is less than 1.0m/s2When the throttle is released, the detected deceleration is smaller, and the brake parameter is not detected.
3. When the truck is braked at a high speed at a point where the larger brake pedal stroke stability time is shorter, if Xai is larger than 1.0m/s2In the process, the braking deviation of each acceleration point in the increasing process of the braking acceleration can be measured by measuring the equivalent braking deceleration Xd and Sz, so that whether the instantaneous braking performance of the automobile during running is normal or not can be mastered at any time, and the running safety is ensured. The tester automatically keeps the maximum values of Xd, Zj and Sz and the like of each driving, can count Xd, Zj, Sz and the like under the conditions of different vehicle speeds, different brake pedal strokes, different loading qualities, different brake pedal moving speeds, different road gradients and different brake pedal stabilization times, can comprehensively analyze the braking performance of the automobile in various driving states, can judge the reduction degree of the braking performance of the automobile by comparing statistical braking parameters in different periods, and is favorable for maintenance, safety management and performance evaluation.
The method for detecting the instantaneous braking performance of the automobile during running can comprehensively detect the braking performance of the automobile in various running states, can measure the instantaneous braking performance of the automobile during running, find potential safety hazards of braking in time, evaluate the reduction degree of the braking performance of the automobile, and has the advantages of accuracy, real-time monitoring and prompting.
Claims (1)
1. The method for detecting the instantaneous braking performance of the automobile during running is a method for detecting the instantaneous braking performance of the automobile in various braking states on any road surface, and is characterized in that: tester for on-board mounting of three-dimensional acceleration sensors, measuring the braking deceleration Xa in the direction of travel of the vehicle in the X-direction, or OB from the vehicleThe D interface or the mobile phone interface reads the instantaneous speed to calculate the brake deceleration Xa, the Y direction measures the brake deceleration Ya in the vertical direction of the automobile, the Z direction measures the acceleration in the transverse direction of the automobile, the automobile measures the instantaneous deceleration values Xai, Yai and Zai at the same moment in the process of driving braking or parking braking, the tester automatically judges the braking process through the deceleration values or the deceleration increasing rate, calculates the intersection point of the Xai deceleration increasing straight line and the Xa-0 horizontal straight line as the brake deceleration starting increasing moment, takes the Yai average value of a plurality of points before the moment as the deceleration detecting value Yj in the Y direction, selects n points adjacent to the Xai maximum value as the detecting section, takes the average value of the detecting section Xai as the brake deceleration detecting value Xj in the X direction, takes the calibration angle converted by Yj as the road surface slope angle B, converts the downhill force or uphill resistance of the automobile on a slope into the brake deceleration A, the equivalent braking deceleration Xd in the running direction of the automobile is Xj +/-A, a minus sign is taken when B is an ascending slope, a plus sign is taken when B is a descending slope, and the transverse displacement speed V of the automobile at the moment when the braking deceleration starts to increase is set0When the braking deviation quantity is equal to 0, calculating the automobile transverse displacement delta Si of the detection value Zai of each sampling interval in the braking process, wherein the algebraic sum of the transverse displacements delta Si of all the sampling intervals in the braking process is the braking deviation quantity Sz; either setting Zai to zero measures Xd only or using Xa, Ya two-dimensional sensors to measure Xd only.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910530155.9A CN110411756A (en) | 2019-06-10 | 2019-06-10 | The instantaneous performance detection method of running car |
| CN2019105301559 | 2019-06-10 |
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| CN110702428A true CN110702428A (en) | 2020-01-17 |
| CN110702428B CN110702428B (en) | 2021-06-04 |
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| CN201911187578.1A Active CN110702428B (en) | 2019-06-10 | 2019-11-13 | Method for detecting instantaneous braking performance of automobile during running |
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| Publication number | Publication date |
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| CN110702428B (en) | 2021-06-04 |
| CN110411756A (en) | 2019-11-05 |
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