CN103398849B - The idling scaling method of the speed of a motor vehicle and engine speed relationship - Google Patents
The idling scaling method of the speed of a motor vehicle and engine speed relationship Download PDFInfo
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Abstract
The idling scaling method of the speed of a motor vehicle and engine speed relationship, automobile when the enterprising action edge of chassis dynamometer test stand or toxic emission or fuel economy detect, engine speed is measured without the need to installing engine speed instrument, the method of the speed of a motor vehicle and engine speed relationship is demarcated at engine idling condition, by test statistics or resource sharing or the engine average temperature idling of estimation institute's inspection vehicle on chassis dynamometer, until the engine speed of vehicle on stand and the speed of a motor vehicle after idling operation is all stablized, measure the dynamometer roller speed of a motor vehicle, demarcate and obtain the speed of a motor vehicle of this gear of examined vehicle on stand and the ratio of engine average temperature idling.
Description
Technology neck city
The idling scaling method of the speed of a motor vehicle and engine speed relationship, automobile when the enterprising action edge of chassis dynamometer test stand or toxic emission or fuel economy detect, engine speed is measured without the need to installing engine speed instrument, demarcate the method for the speed of a motor vehicle and engine speed relationship at engine idling condition, belong to automotive performance Platform test method and technology neck city.
Background technology
In the toxic emission of diesel vehicle lug down method detects, need to measure engine speed, engine speed instrument is adopted to measure engine speed, there is the contradiction of operability and accuracy, if adopt the higher engine speed instrument of accuracy to measure, the operability of installing rotational speed meters sensor is very poor; If adopt the adsorption vibration formula sensor of preferable operability, then detection accuracy is very poor.
When engine torque capabilities might speed of a motor vehicle point regulation loads cutting load testing dynamic property or fuel economy, when the loading force of rated output absorption plant or when calculating the nominal torque detection speed of a motor vehicle, need vehicle hang the speed of a motor vehicle of wheel box gear and the ratio K of engine speed, see Chinese invention patent " automobile constant speed engine regulation loads load testing method ", the patent No.: ZL200910225329.7, when examined In-Use Motor Vehicles is without engine speed indicator, also without complete vehicle technology parameter, also resource sharing K value cannot be obtained, then need engine speed instrument to be installed to mark defining K value, also there is the contradiction of operability and accuracy.For overcoming the deficiencies in the prior art, adopt the idling scaling method of the speed of a motor vehicle and engine speed relationship, without the need to installing engine speed instrument, vehicle engine idling condition on chassis dynamometer is fast demarcated and is obtained K value.
Summary of the invention
In same automobile mechanical transmission, the magnitude relationship hanging up the vehicle velocity V i after gear and engine speed ni is fixing, and K=Vi/ni is constant.The rated speed of different engine is widely different, but the idling of engine is then more or less the same, it is also little that different vehicle hangs up the engine idle difference of wheel box gear on chassis dynamometer, by to the test statistics of various vehicle or resource sharing or estimation, can determine that various vehicle hangs up the range of speeds of the engine stabilizer idling of wheel box gear on chassis dynamometer, using average temperature idling as engine speed corresponding to the vehicle stand idling operation speed of a motor vehicle, thus obtain the examined speed of a motor vehicle of this gear of vehicle and the magnitude relationship of engine speed, its test method is as follows:
Vehicle cuts out the nonessential energy-dissipating devices such as air-conditioning, reach the chassis dynamometer do not loaded, the engine speed instrument that precision is higher is adopted to measure engine crankshaft rotating speed, open the throttle hang up wheel box detect gear make the speed of a motor vehicle increase, then gas pedal is totally released, engine is made to be in idling operation, the speed of a motor vehicle and engine speed decline gradually, when engine speed and the speed of a motor vehicle are all after idling operation is stable, measure and recording engine speed of crankshaft, respectively to diesel vehicle, gasoline car, the In-Use Motor Vehicles of the various vehicle series of passenger vehicle and lorry measures engine idle, thus statistics obtains the engine stabilizer idling scope on chassis dynamometer, due to different classes of, the vehicle platform system resistance of different series vehicle is different, for reducing the scope of various engine stabilizer idling, improve accuracy, can by diesel vehicle, gasoline car statistic of classification, or press passenger vehicle, lorry statistic of classification, or by vehicle series classification statistics, also can be obtained by resource sharing or classification estimation.
Because the vehicle platform system resistance (containing race of engine resistance) on chassis dynamometer is greater than race of engine resistance, so the driving force of engine idling condition increase corresponding to fuel delivery on stand, engine idle rotational slightly reduces, such as, certain vehicle series in the stable idling dallied with diesel-powered truck in (650 ~ 750) r/min scope, can estimate that the diesel engine on chassis dynamometer stablizes idling scope for (600 ~ 700) r/min, average temperature idling is 650r/min.
The idling scaling method of the speed of a motor vehicle and engine speed relationship, that automobile is when the enterprising line correlation Performance Detection of chassis dynamometer, do not measure engine speed to demarcate the method for the speed of a motor vehicle and engine speed magnitude relationship, it is characterized in that: by test statistics or resource sharing or the engine average temperature idling n of estimation institute's inspection vehicle on chassis dynamometer
1vehicle cuts out the nonessential energy-dissipating devices such as air-conditioning, on the chassis dynamometer do not loaded, open the throttle after hanging up the wheel box detection gear rising speed of a motor vehicle, be totally released gas pedal, make engine be in idling operation, engine speed and the speed of a motor vehicle decline gradually, until engine speed and the speed of a motor vehicle after idling operation is all stablized, measure the dynamometer roller speed of a motor vehicle and vehicle wheel vehicle speeds V
1, demarcate and obtain the speed of a motor vehicle of this gear of examined vehicle on stand and the ratio K=V of engine speed
1/ n
1.The advantage of this method is as follows:
1, the vehicle platform system resistance of different series vehicle is different, but SR changes little with the ratio of race of engine resistance, making fuel feeding scaling up and idling reduce ratio also changes not quite, as vehicle is larger, driving shaft is heavy and SR is larger, race of engine resistance is comparatively large, and various ratio change is little, closes nonessential energy-dissipating device to reduce SR.
2, wheel box detects gear, generally determine according to vehicle different performance testing requirement, dynamic property and toxic emission detect and normally directly keep off, and fuel economy detects normally most top gear, and the engine idle change of the different gear of same vehicle gear box is very little.
3, for reducing the engine stabilizer idling scope of statistics as far as possible, improve the accuracy of demarcating, can segment by different fuel, different vehicle classification, different automobile types series to carry out test statistics or estimation, institute's inspection vehicle transfers the average temperature idling of test statistics or estimation automatically according to the information of vehicles logged in.
4, various Performance Detection is carried out at engine torque capabilities might point, can according to engine torque capabilities might rotating speed n
mcalculate corresponding vehicle velocity V
m=K × n
m.
5, without the need to the complete skill parameter of examined vehicle, engine torque and engine accessory power rating can be consumed the engine equivalent driving force of moment of torsion Equivalent Conversion in wheel drive surfaces and engine accessory power rating equivalent resistance, thus loading force when determining vehicle various Performance Detection needed for device for power absorption.
6, without the need to install engine speed instrument measure rotating speed, by institute survey automobile's instant velocity Vi, can calculate correspondence motor instant rotating speed ni=Vi/K.
Specific embodiments
The idling scaling method of the speed of a motor vehicle and engine speed relationship, be detected as example with the toxic emission of diesel vehicle underlug-down mode method, specific embodiments is as follows:
Test 5040 serial box diesel-powered trucks, rated engine speed is 3600r/min, estimate that the average temperature idling of this serial vehicle is 650r/min, vehicle cuts out the nonessential energy-dissipating devices such as air-conditioning, on the chassis dynamometer do not loaded, increase throttle progressively hangs up directly gear makes the speed of a motor vehicle more than after 30km/h, be totally released gas pedal, engine is made to be in idling operation, at this moment engine speed and the speed of a motor vehicle can decline gradually, after the engine speed of vehicle on stand and the speed of a motor vehicle are all stablized, measure dynamometer roller vehicle velocity V
1for 15.2km/h, calculate the speed of a motor vehicle and engine speed magnitude relationship K=V that this vehicle gear box directly keeps off
1/ n
1=15.2/650=0.0234.Then open the throttle and carry out underlug-down mode method toxic emission detection, when surveyed automobile's instant velocity is Vi, the instant engine rotating speed of its correspondence is ni=Vi/K=Vi/0.0234, when the maximum wheel power speed of a motor vehicle of detection is 78.3km/h, the engine speed of its correspondence is 78.3/0.0234=3346r/min.
The idling scaling method of the speed of a motor vehicle and engine speed relationship, just can measure K value and engine speed corresponding to each speed of a motor vehicle point without the need to installing engine speed instrument, having the advantage of excellent operability and accuracy.
Claims (1)
1. the idling scaling method of the speed of a motor vehicle and engine speed relationship, that automobile is when the enterprising line correlation Performance Detection of chassis dynamometer, do not measure engine speed to demarcate the method for the speed of a motor vehicle and engine speed magnitude relationship, it is characterized in that: by test statistics or resource sharing or the engine average temperature idling n1 of estimation institute's inspection vehicle on chassis dynamometer, vehicle cuts out the nonessential energy-dissipating device of air-conditioning, on the chassis dynamometer do not loaded, open the throttle after hanging up the wheel box detection gear rising speed of a motor vehicle, be totally released gas pedal, engine is made to be in idling operation, engine speed and the speed of a motor vehicle decline gradually, until engine speed and the speed of a motor vehicle after idling operation is all stablized, measure the dynamometer roller speed of a motor vehicle and vehicle wheel vehicle speeds V
1, demarcate and obtain the speed of a motor vehicle of this gear of examined vehicle on stand and the ratio K=V of engine speed
1/ n1.
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| CN104198196B (en) * | 2014-08-28 | 2017-01-11 | 吴明 | Method for detecting equivalent inertia of rotating parts of automobile and engine |
| CN105317990A (en) * | 2015-12-08 | 2016-02-10 | 潍柴动力股份有限公司 | Method and system for gear position calibration of gearbox |
| CN107101832A (en) * | 2016-02-19 | 2017-08-29 | 宝沃汽车（中国）有限公司 | The work information acquisition methods and device of engine development experiment |
| CN111413101A (en) * | 2020-04-02 | 2020-07-14 | 无锡市海龙机械有限公司 | Engine exhaust emission detection device and working method thereof |
| CN111878243B (en) * | 2020-06-30 | 2021-08-06 | 东风汽车集团有限公司 | Vehicle crawling target idle speed control method and system |
| CN114577482A (en) * | 2022-02-28 | 2022-06-03 | 东风汽车有限公司东风日产乘用车公司 | Bench measuring vehicle emission method, electronic device and storage medium |
| CN114942098B (en) * | 2022-04-29 | 2023-06-16 | 重庆长安汽车股份有限公司 | Method for measuring maximum wheel power of automatic transmission automobile |
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Effective date of registration: 20201110 Address after: 225700 west side of Fukang Road, Shuai duo village, Dainan Town, Xinghua City, Taizhou City, Jiangsu Province Patentee after: JIANGSU YASHENG METAL PRODUCTS Co.,Ltd. Address before: 528415, Xiaolan Town, Xiaolan Town, Zhongshan, Guangdong, No. 16 vehicle Siu Lam inspection station Patentee before: Wu Ming |
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