CN103134683A - System and method for indoor exhaust braking test of vehicle engine - Google Patents
System and method for indoor exhaust braking test of vehicle engine Download PDFInfo
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- CN103134683A CN103134683A CN2011103913234A CN201110391323A CN103134683A CN 103134683 A CN103134683 A CN 103134683A CN 2011103913234 A CN2011103913234 A CN 2011103913234A CN 201110391323 A CN201110391323 A CN 201110391323A CN 103134683 A CN103134683 A CN 103134683A
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Abstract
The invention discloses a system and a method for an indoor exhaust braking test of a vehicle engine. The system comprises a chassis dynamometer, a data collecting device and a data analysis device. A drum of the chassis dynamometer is arranged below driving wheels of a tested vehicle, the road simulation resistance coefficient of a slope with preset angles is arranged in the chassis dynamometer, and so that the road simulation resistance of the slope with the preset angles is exerted to the tested wheel. The data collecting device is used for collecting the operating data of the vehicle when the vehicle travels on the slope with a plurality of preset angles. The data analysis device is used for analyzing the performance of exhausting and braking of the vehicle according to the collected operating data. According to the system and the method for the indoor exhaust braking test of the vehicle engine, the exhaust braking performance of the vehicle is tested by the chassis dynamometer, the data needed in a test is collected, the process of data collecting is simple, convenient and fast, and the precision of the collected data is high. Testing is convenient, fast and effective, and the cost of testing is greatly lowered.
Description
Technical field
The present invention relates to the vehicle performance test technology, and be particularly related to the indoor system and method that carries out the test of vehicle motor exhaust brake.
Background technology
Vehicle testing is checking vehicle performance topmost method, has important effect in the exploitation of vehicle, proof procedure, and wherein the exhaust brake performance is to weigh a key factor of vehicle motor safety.During at the long road running of length of grade, adopt engine exhaust and brake when vehicle, can reduce the number of times of service brake, reduce the temperature rise of brake drum, improve the reliability of braking; During at ice and snow and sliding muddy water road traveling, use engine exhaust and brake when vehicle, can reduce sideslip, reduce the supply of engine oil plant so that oil-break, fuel saving.Traditional engine exhaust and brake performance test is based on outdoor road and carries out actual test, in test process, the data acquisition of vehicle is inconvenient, change test gradient difficulty, same test condition is tested repeatedly also to be had more highly difficultly, and test process easily is subject to environmental impact, as outdoor when carrying out road test, affected by the factor such as weather larger, when weather is more abominable, can produce considerable influence to the accuracy of test result.Therefore, it is less that industry is badly in need of a kind of environmental restraint that is subjected to, the method that can test the vehicle gas exhausting braking performance effectively accurately.
Summary of the invention
The object of the present invention is to provide a kind of indoor system and method that carries out the test of vehicle motor exhaust brake, be used for solving the above-mentioned problems in the prior art.
The invention provides a kind of indoor system that carries out the test of vehicle motor exhaust brake, comprising:
Chassis dynamometer, its rotary drum are placed under the driving wheel of testing vehicle, by the domatic road analogy resistance coefficient of predetermined angle is set in described chassis dynamometer, apply the domatic road analogy resistance of predetermined angle to testing vehicle;
Data acquisition equipment is used for by described chassis dynamometer, the service data when collection vehicle is travelled on a plurality of predetermined angle domatic; Described service data comprises at least: when described vehicle adopted the exhaust brake operation on domatic, the speed of a motor vehicle was dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity; And this vehicle do not adopt exhaust brake when operation on domatic, and the speed of a motor vehicle is dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity;
Data analysis facilities is used for analyzing the performance of the exhaust brake of described vehicle according to the described service data that gathers.
The present invention also provides a kind of indoor method of carrying out the test of vehicle motor exhaust brake, and the driving wheel of testing vehicle is placed on the rotary drum of chassis dynamometer; The method comprises:
By the domatic road analogy resistance coefficient of predetermined angle is set, apply the domatic road analogy resistance of predetermined angle to testing vehicle in described chassis dynamometer;
By described chassis dynamometer, the service data when collection vehicle is travelled on a plurality of predetermined angle domatic; Described service data comprises at least: when described vehicle adopted the exhaust brake operation on domatic, the speed of a motor vehicle was dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity; And this vehicle do not adopt exhaust brake when operation on domatic, and the speed of a motor vehicle is dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity;
According to the described service data that gathers, analyze the performance of the exhaust brake of described vehicle.
The present invention utilizes chassis dynamometer that the exhaust brake performance of vehicle is tested, and by the needed data of data acquisition equipment collecting test of chassis dynamometer, the process of its collection is simple, convenient, fast, and the data precision of collection is higher.And be subjected to the Restricted requirements such as weather less, convenient test is effective and rapid, and greatly reduces the cost of test.
Description of drawings
Fig. 1 is the indoor schematic diagram that carries out the system of vehicle motor exhaust brake test of the present invention;
Fig. 2 is the workflow diagram of preliminary work and the method for testing of vehicle gas exhausting braking performance test of the present invention.
Embodiment
The exemplary embodiments that embodies feature ﹠ benefits of the present invention will be described in detail in the following description.Be understood that the present invention can have various variations on different embodiment, its neither departing from the scope of the present invention, and explanation wherein and appended accompanying drawing be when the use that explain in itself, but not in order to limit the present invention.
The present invention utilizes vehicle chassis dynamometer to provide accurate road load simulation and road test condition for testing vehicle, and making can be at the indoor engine exhaust and brake performance test that carries out.Carry out the vehicle gas exhausting braking performance test under road analogy (Roadload Simulation) pattern, the effective performance of test engine exhaust brake, particularly use chassis dynamometer simulation descending road surface, can control accurately the gradient, realize the accurate test of testing vehicle engine exhaust and brake.When test, set respectively the domatic of a plurality of angles and test, for example choose-7 degree extremely and a plurality of domatic test of 0 degree scope, after test, the result of gained is analyzed and contrasted, analyze the exhaust brake performance of vehicle for the staff.
Before carrying out the exhaust brake performance test, at first the requirement of root country's dependence test standard or manufacturer presets test initial velocity and the test end speed of vehicle.When carrying out the exhaust brake test on domatic, testing vehicle is progressively accelerated to the test initial velocity, open exhaust brake valve and make the speed of a motor vehicle be down to the test end speed, use the data acquisition equipment of chassis dynamometer to record the braking time of vehicle and braking distance, braking deceleration; Repeat successively at least 3 tests, get its average to reduce error.If the speed of a motor vehicle can't reduce or can't reach the test end speed for a long time, increase the gradient and again test.Can set the different gradients according to the different speed of a motor vehicle in test process, it is simple to operate, can satisfy the demand of different tests.
Be the indoor schematic diagram that carries out the system of vehicle motor exhaust brake test of the present invention referring to Fig. 1.Shown in Figure 1, this system comprises:
Chassis dynamometer, its rotary drum are placed under the driving wheel of testing vehicle, by the domatic road analogy resistance coefficient of predetermined angle is set in described chassis dynamometer, apply the domatic road analogy resistance of predetermined angle to testing vehicle;
Wherein, the road analogy resistance coefficient in chassis dynamometer is the resistance coefficient that the road according to described vehicle slides on the spot, or the resistance target factor of the approximate vehicle of described vehicle is set.The span of domatic predetermined angle can be for 0 degree to-7 degree.
Data acquisition equipment is used for by described chassis dynamometer, the service data when collection vehicle is travelled on a plurality of predetermined angle domatic; Described service data comprises at least: when described vehicle adopted the exhaust brake operation on domatic, the speed of a motor vehicle was dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity; And this vehicle do not adopt exhaust brake when operation on domatic, and the speed of a motor vehicle is dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity;
Data analysis facilities is used for analyzing the performance of the exhaust brake of described vehicle according to the described service data that gathers.
In the embodiment shown in fig. 1, data acquisition equipment and data analysis facilities are integrated in a computing machine and realize.In addition, also can according to specific needs, adopt different equipment to realize respectively data acquisition equipment and data analysis facilities.
When carrying out data analysis, this data analysis facilities is used for domaticly for same angle, analyzes and the service data of contrast vehicle when adopting exhaust brake and when not adopting exhaust brake; Adopt the situation of exhaust brake for vehicle, analyze and the contrast vehicle in different angles are domatic when travelling service data; And the situation that adopts exhaust brake for vehicles failed, analyze and the contrast vehicle in different angles are domatic when travelling service data.Exhaust brake performance according to the described vehicle of interpretation of result of analyzing and contrasting.
Based on above-mentioned test macro, the invention provides indoor method of carrying out the test of vehicle motor exhaust brake, shown in Figure 2 is the indoor method flow diagram that carries out the test of vehicle motor exhaust brake of the present invention.For guaranteeing the accuracy of vehicle testing, before testing for vehicle, the present invention also needs to carry out certain preliminary work, and shown in Figure 2 to guarantee the accuracy of follow-up test, the method comprises:
The preliminary work of S1, test environment and equipment
1, require the test site ambient humidity to be no more than 95% before the test test; Environment temperature is between 0～40 ℃; Atmospheric pressure 90～110kpa.
2, testing apparatus is checked, testing apparatus requires function normal; Adopt the control accuracy of alternating electromotive force list rotary drum chassis dynamometer should be not less than relevant technical requirement; Data acquisition equipment (contain sensor), engine speed instrument, the vehicle-mounted data measuring system household function supporting with chassis dynamometer use normal.
3, arrange temperature sensor, record the information such as environment temperature and time by data acquisition equipment.
S2, sample car are prepared
Testing vehicle requires to carry out road Coast-down check on the spot, obtains real road resistance of taxing equation accurately; And carry out the test specimens car test and look into, confirm to comprise that the states such as engine, wheel box, transmission shaft, back axle, tire, machine oil satisfy test request.
The preheating of S3, testing vehicle and chassis dynamometer is prepared
1, chassis dynamometer is set under the road analogy pattern, adopts vehicle traction rotary drum positive test pattern, suitably adjust the gradient testing vehicle kinematic train is loaded, make engine and gear train reach normal working temperature.The recommend adoption performance curve carries out preheating to vehicle; Be controlled at about half an hour whole preheating time.
2, vehicle neutral idle arranges dynamometer machine under the anti-drag mode formula of constant speed (Constant Speed), with the speed of 50km/h, moves 5 minutes with the anti-vehicle that drags of rotary drum, and whether steady image data analyzes gear train resistance power.As observe resistance power without great variety, and illustrate that preheating is abundant, namely can begin setup test.
S4, the road analogy resistance coefficient of chassis dynamometer is set, carries out the road Coast-down check, whether judgement slides normal.
The road analogy resistance coefficient of chassis dynamometer can be set according to the resistance coefficient that road slides on the spot; If the resistance coefficient that does not have road to slide on the spot can be set with reference to the resistance target factor of approximate vehicle the road analogy resistance coefficient of chassis dynamometer.
After being provided with the road analogy resistance coefficient of chassis dynamometer, testing vehicle is carried out the road Coast-down check, slide and normally can carry out follow-up Caused by Sloping Surfaces exhaust brake performance test.
After completing above-mentioned preliminary work, just can carry out the exhaust brake performance test of vehicle, it is vehicle drops to the braking procedure of test end speed from testing initial velocity that testing vehicle is carried out the exhaust brake test, by exhaust brake retarded velocity, braking distance and three data volumes of braking time of obtaining vehicle, the exhaust brake performance of vehicle is tested.
S5, the gradient is set tests, judge whether the speed of a motor vehicle reaches the test end speed within a certain period of time
At first the domatic angle of test is set, for example can be with the scope of domatic being set to-7 degree to 0 degree, whether testing vehicle can drop to the test end speed from the test initial velocity at certain hour.If can not, illustrate that the exhaust brake performance deficiency of testing vehicle on this gradient is so that the Speed Reduction of testing vehicle and the stable test end speed that reaches, needing suitably to increase the gradient tests again, until testing vehicle can be reduced to the test end speed at certain hour, the gradient that arrange this moment is the comparatively suitable gradient of test exhaust brake performance.
S6: by described chassis dynamometer, the service data when collection vehicle is travelled on a plurality of predetermined angle domatic; Described service data comprises at least: when described vehicle adopted the exhaust brake operation on domatic, the speed of a motor vehicle was dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity; And this vehicle do not adopt exhaust brake when operation on domatic, and the speed of a motor vehicle is dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity;
S7: according to the described service data that gathers, analyze the performance of the exhaust brake of described vehicle.
Below test on domatic as example at-7 degree to 0 degree take vehicle and be specifically described, method is as follows:
Step 1, setting-7 are spent domatic, and the exhaust brake of starting the engine is tested.
Chassis dynamometer is set-7 degree gradients under the road analogy pattern.During test, vehicle progressively accelerates and is stabilized in than the test initial velocity and manys the speed point of 2km/h, opens the exhaust brake valve of engine switch and makes the speed of a motor vehicle be down to the test end speed, records braking time, braking distance and the braking deceleration of vehicle, and repeated test is 3 times successively; If the speed of a motor vehicle can't reduce or can't reach the test end speed for a long time, suitably increasing the gradient tests again, as be increased to-6 degree and again test, until testing vehicle can be reduced to the test end speed, the gradient that arrange this moment is the comparatively suitable gradient of test exhaust brake performance.
It is domatic that step 2, setting-7 are spent, and the exhaust brake of not starting the engine is tested.
Chassis dynamometer set under the road analogy pattern and step 1 in the identical gradient.During test, vehicle progressively accelerates and is stabilized in than the test initial velocity and manys the speed point of 2km/h, the driver unclamps throttle, make vehicle walking to the test end speed without any the Braking downslide, record braking time, braking distance and the braking deceleration of vehicle, repeated test is 3 times successively; If test detects the speed of a motor vehicle and can't reduce from initial velocity, can cancel this test and detect.
Step 3, arrange 0 the degree domatic, the exhaust brake of starting the engine is tested.
Chassis dynamometer is set 0 domatic test of degree under the road analogy pattern, during test, vehicle progressively accelerates and is stabilized in than the test initial velocity and manys the speed point of 2km/h, open the exhaust brake valve of engine switch and make the speed of a motor vehicle be down to the test end speed, record braking time, braking distance and the braking deceleration of vehicle.Repeated test is 3 times successively.
Step 4, arrange 0 the degree domatic, the exhaust brake of not starting the engine is tested.
Chassis dynamometer is set 0 degree under the road analogy pattern domatic, during test, vehicle progressively accelerates and is stabilized in than the test initial velocity and manys the speed point of 2km/h, the driver unclamps throttle, make vehicle walk to the test end speed without any the Braking downslide, record the braking time of vehicle and braking distance, braking deceleration, repeated test is 3 times successively.
Based on above-mentioned method of testing, just obtained the master data that is used for the exhaust brake analysis, based on these data, just can carry out the analytical work of exhaust brake.The method specifically comprises:
Steps A: domatic for same angle, analyze and the service data of contrast vehicle when adopting exhaust brake and when not adopting exhaust brake;
Adopt the situation of exhaust brake for vehicle, analyze and the contrast vehicle in different angles are domatic when travelling service data; And
Adopt the situation of exhaust brake for vehicles failed, analyze and the contrast vehicle in different angles are domatic when travelling service data.
Step B: according to the exhaust brake performance of the described vehicle of interpretation of result of the analysis of steps A and contrast.
By above-mentioned analytical work, the staff just can learn testing vehicle under the same gradient, vehicle development engine exhaust braking and analysis and the comparing result of its exhaust brake performance when not starting the engine; And, under different gradient, start the engine exhaust brake and analysis and the comparing result of its exhaust brake performance when not starting the engine, based on above-mentioned analysis and comparing result, the exhaust brake performance that the staff just can the basic understanding vehicle.
The present invention utilizes chassis dynamometer that the exhaust brake performance of vehicle is tested, and by the needed data of data acquisition equipment collecting test of chassis dynamometer, gatherer process is simple, convenient, fast, and the data precision that gathers is higher.Be subjected to the restriction of road conditions when having solved the real road test, change the technical matters of test gradient difficulty.Realized testing at the indoor chassis dynamometer simulated roadway that utilizes, can change at any time the test gradient according to chassis dynamometer operating system as required, dirigibility, the repeatability of test improve greatly.Compare when carrying out the real road test, be subjected to the factors such as weather to affect larger, even when weather is more abominable, situation about can't test, technical scheme of the present invention has realized the indoor exhaust brake performance test that carries out, be subjected to the Restricted requirements such as weather less, convenient test is effective and rapid, greatly reduces the cost of test.
Claims (6)
1. an indoor system that carries out the test of vehicle motor exhaust brake, is characterized in that, comprising:
Chassis dynamometer, its rotary drum are placed under the driving wheel of testing vehicle, by the domatic road analogy resistance coefficient of predetermined angle is set in described chassis dynamometer, apply the domatic road analogy resistance of predetermined angle to testing vehicle;
Data acquisition equipment is used for by described chassis dynamometer, the service data when collection vehicle is travelled on a plurality of predetermined angle domatic; Described service data comprises at least: when described vehicle adopted the exhaust brake operation on domatic, the speed of a motor vehicle was dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity; And this vehicle do not adopt exhaust brake when operation on domatic, and the speed of a motor vehicle is dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity;
Data analysis facilities is used for analyzing the performance of the exhaust brake of described vehicle according to the described service data that gathers.
2. the indoor system that carries out vehicle motor exhaust brake test according to claim 1, it is characterized in that, road analogy resistance coefficient in described chassis dynamometer is the resistance coefficient that the road according to described vehicle slides on the spot, or the resistance target factor of the approximate vehicle of described vehicle is set; The span of described domatic predetermined angle is that 0 degree is to-7 degree;
Described data analysis facilities is used for domaticly for same angle, analyzes and the service data of contrast vehicle when adopting exhaust brake and when not adopting exhaust brake; Adopt the situation of exhaust brake for vehicle, analyze and the contrast vehicle in different angles are domatic when travelling service data; And the situation that adopts exhaust brake for vehicles failed, analyze and the contrast vehicle in different angles are domatic when travelling service data.Exhaust brake performance according to the described vehicle of interpretation of result of analyzing and contrasting.
3. indoor method of carrying out vehicle motor exhaust brake test, the driving wheel of testing vehicle is placed on the rotary drum of chassis dynamometer; It is characterized in that, the method comprises:
By the domatic road analogy resistance coefficient of predetermined angle is set, apply the domatic road analogy resistance of predetermined angle to testing vehicle in described chassis dynamometer;
By described chassis dynamometer, the service data when collection vehicle is travelled on a plurality of predetermined angle domatic; Described service data comprises at least: when described vehicle adopted the exhaust brake operation on domatic, the speed of a motor vehicle was dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity; And this vehicle do not adopt exhaust brake when operation on domatic, and the speed of a motor vehicle is dropped to braking distance, braking time and the braking deceleration of test end speed by the test initial velocity;
According to the described service data that gathers, analyze the performance of the exhaust brake of described vehicle.
4. indoor method of carrying out vehicle motor exhaust brake test according to claim 3, it is characterized in that, road analogy resistance coefficient in described chassis dynamometer is the resistance coefficient that the road according to described vehicle slides on the spot, or the resistance target factor of the approximate vehicle of described vehicle is set; The span of described domatic predetermined angle is that 0 degree is to-7 degree;
According to the described service data that gathers, analyze the performance of the exhaust brake of described vehicle, comprise the following steps:
Steps A: domatic for same angle, analyze and the service data of contrast vehicle when adopting exhaust brake and when not adopting exhaust brake;
Adopt the situation of exhaust brake for vehicle, analyze and the contrast vehicle in different angles are domatic when travelling service data; And
Adopt the situation of exhaust brake for vehicles failed, analyze and the contrast vehicle in different angles are domatic when travelling service data.
Step B: according to the exhaust brake performance of the described vehicle of interpretation of result of the analysis of steps A and contrast.
5. indoor method of carrying out the test of vehicle motor exhaust brake according to claim 3, is characterized in that, described method also comprises: before test, described vehicle is carried out preheating, described pre-heating mean comprises:
Adopt vehicle traction rotary drum positive test pattern, adjust the gradient testing vehicle kinematic train is loaded, make engine and gear train reach normal working temperature.
6. indoor method of carrying out the test of vehicle motor exhaust brake according to claim 5, is characterized in that, adopts the mode of performance curve to carry out preheating to described vehicle, and be about half an hour preheating time.
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| CN104849065A (en) * | 2014-12-22 | 2015-08-19 | 北汽福田汽车股份有限公司 | Mountain road simulating test method and device for vehicle |
| CN106644451A (en) * | 2017-02-06 | 2017-05-10 | 浙江博力机电制造有限公司 | Vehicle exhaust auxiliary brake valve performance detection device and working method thereof |
| CN107036822A (en) * | 2016-11-17 | 2017-08-11 | 安徽江淮汽车集团股份有限公司 | It is vented auxiliary braking performance test methods and test system |
| CN113203575A (en) * | 2021-04-07 | 2021-08-03 | 东风汽车股份有限公司 | Method for measuring automobile exhaust braking efficiency on straight road section |
| CN113203576A (en) * | 2021-04-07 | 2021-08-03 | 东风汽车股份有限公司 | Method for measuring automobile exhaust braking efficiency on long-slope section |
| CN114721359A (en) * | 2022-05-23 | 2022-07-08 | 交通运输部公路科学研究所 | Test platform and test method for predictive cruise control system |
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| CN104729859A (en) * | 2013-12-18 | 2015-06-24 | 北汽福田汽车股份有限公司 | Automobile climbing testing method and system |
| CN104729859B (en) * | 2013-12-18 | 2017-12-08 | 北汽福田汽车股份有限公司 | Automobile climbing method of testing and test system |
| CN104849065A (en) * | 2014-12-22 | 2015-08-19 | 北汽福田汽车股份有限公司 | Mountain road simulating test method and device for vehicle |
| CN107036822A (en) * | 2016-11-17 | 2017-08-11 | 安徽江淮汽车集团股份有限公司 | It is vented auxiliary braking performance test methods and test system |
| CN107036822B (en) * | 2016-11-17 | 2019-12-03 | 安徽江淮汽车集团股份有限公司 | It is vented auxiliary braking performance test methods and test macro |
| CN106644451A (en) * | 2017-02-06 | 2017-05-10 | 浙江博力机电制造有限公司 | Vehicle exhaust auxiliary brake valve performance detection device and working method thereof |
| CN106644451B (en) * | 2017-02-06 | 2023-04-18 | 浙江博力机电制造有限公司 | Performance detection equipment for exhaust auxiliary brake valve for vehicle and working method thereof |
| CN113203575A (en) * | 2021-04-07 | 2021-08-03 | 东风汽车股份有限公司 | Method for measuring automobile exhaust braking efficiency on straight road section |
| CN113203576A (en) * | 2021-04-07 | 2021-08-03 | 东风汽车股份有限公司 | Method for measuring automobile exhaust braking efficiency on long-slope section |
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