CN113358361A - Novel engine starting performance evaluation method - Google Patents
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Abstract
A novel engine starting performance evaluation method belongs to the technical field of automobile engines. The method of the invention comprises the following steps: firstly, immersing a vehicle in a high and cold environment to carry out an engine starting test; then, the vehicle is immersed in a normal temperature environment, the engine is started under the condition that the water temperature of the engine is different, and starting data are tested and sorted; then immersing the vehicle in a high-temperature environment, and sequentially carrying out cold start, semi-cold start, heat engine start, repeated start and enrichment and lean start tests; and finally, immersing the vehicle in a plateau environment, and sequentially carrying out cold start, enrichment and dilution start and heat engine start tests. According to the invention, the starting performance of the engine of the type is evaluated by mastering the starting test method and according to the quantized starting performance index.
Description
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to a novel engine starting performance evaluation method.
Background
The engine can be normally started after being matched with an electronic fuel injection system, and has three elements: strong and timed high pressure spark, proper air-fuel ratio, sufficient cylinder compression pressure. The high-energy ignition system can realize high-pressure spark, the accurate fuel system can provide accurate fuel injection quantity, and a proper starter can meet the cylinder pressure required by ignition. The three conditions can be generally met simultaneously, the engine can be normally started, and if a certain element works abnormally, the engine cannot be started or is difficult to start. The matching degree of the three components influences the starting quality of the engine, further influences the overall level of the engine, and the method for evaluating the starting performance of the engine is very important.
The current evaluation of the engine starting performance mainly depends on subjective judgment, and no detailed quantitative index exists.
Disclosure of Invention
The invention aims to provide a novel method for evaluating engine starting performance, which aims to solve the problem that the current engine starting performance evaluation mainly depends on subjective judgment and has no detailed quantitative index.
The invention provides an evaluation method for quantifying engine starting performance indexes by mastering and analyzing the working principles of an engine and corresponding parts, an electronic fuel injection system and various measuring devices and by means of the existing devices.
After the calibration matching of the engine is completed, ignition and oil injection when the engine is started are controlled by the ECU, ECU signals are transmitted by means of calibration software INCA, and the information of the parameters of the actual rotating speed, the target rotating speed, the water temperature, the air inlet temperature, the system voltage and the atmospheric pressure of the engine is read.
The starting test method is mastered, the starting performance of the engine is evaluated according to the quantized starting performance indexes, and the evaluation result is real and reliable.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel method of evaluating engine start performance, the method comprising the steps of:
the method comprises the following steps: firstly, immersing a vehicle in an environment with high and cold temperature (the atmospheric temperature is-30-10 ℃) to carry out an engine starting test, wherein cold starting, cold start of enrichment and dilution, continuous repeated starting, semi-cold start and hot start are contained in the test; reading and recording the parameter information in the starting process of the engine, screening starting data, and using data processing software MDA to arrange the starting data to obtain the number of engine starting times, starting time, starting uprush rotating speed and fallback data required by evaluation; according to the following principle: the engine is started smoothly without flameout; smooth engine transition from start-up to idle; the rotating speed climbing and falling are smooth and have no abnormal upward stroke and downward stroke; when the engine enters an idle speed, the deviation between the actual rotating speed and the target rotating speed does not exceed plus or minus 50 revolutions, and then the starting performance of the engine is evaluated;
step two: then, the vehicle is immersed in a normal-temperature environment (the atmospheric temperature is 20-30 ℃), the engine is started by the water temperature of the engine under various temperature conditions, starting data are tested and sorted, and the starting performance evaluation indexes of the water temperature of the engine under various temperature conditions in the normal-temperature environment of the engine are quantized as follows: the engine is successfully started once, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling back are smooth in the starting process;
step three: then immersing the vehicle in a high-temperature environment (the atmospheric temperature is more than or equal to 30 ℃), and sequentially carrying out cold start, semi-cold start, heat engine start, repeated start and enrichment and dilution start tests;
step four: and finally, immersing the vehicle in a plateau (the environmental pressure is 55-75 kpa) environment, and sequentially carrying out cold start, enrichment and lean start and heat engine start tests.
Furthermore, in the step one, the starting performance indexes of the engine in the severe cold environment are quantified by combining the tested starting data as follows:
1) the cold start time is defined by the following coolant temperature T range:
when T is more than or equal to-30 ℃, one-time starting is successful, and the starting time is less than or equal to 8 seconds;
when T is more than or equal to-25 ℃, one-time starting is successful, and the starting time is less than or equal to 5 seconds;
when T is more than or equal to-20 ℃, one-time starting is successful, and the starting time is less than or equal to 3 seconds;
when T is more than or equal to-10 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
when T is more than or equal to 0 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
the upper punch rotating speed does not exceed 1850rpm, and the rotating speed climbing and falling back are smooth in the starting process;
2) the evaluation indexes of the starting performance of the enrichment and dilution cold machine are as follows: the one-time starting is successful, a cylinder is not flooded, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling back in the starting process are smooth;
3) the evaluation indexes of the performance of the continuous repeated starting are as follows: the cold start is ensured to be carried out continuously for 5-10 times of repeated start under normal condition, the cylinder is successfully and successfully not flooded each time of start, and the phenomenon of serious shaking of the engine is avoided;
4) the evaluation indexes of the starting performance of the semi-cold machine are as follows: 1-time starting is successful, the starting time is less than 4s, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling in the starting process are smooth;
5) the evaluation indexes of the starting performance of the heat engine are as follows: the starting is successful for 1 time, the starting time is less than 1s, the uprush rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth.
Further, in the third step, in the high-temperature environment of the quantized engine of the type, the starting performance evaluation indexes are as follows:
1) starting a cold machine; the temperature difference between the engine coolant and the air inlet temperature is less than 3 ℃, the one-time starting is successful, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling in the starting process are smooth;
2) starting a semi-cooler; the temperature difference between the engine coolant and the air inlet temperature is larger than 3 ℃, the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling in the starting process are smooth;
3) starting the heat engine; the temperature of the cooling liquid is 80-90 ℃, the starting is successful once, the starting time is less than 1s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling back in the starting process are smooth;
4) repeatedly starting; the method has the advantages that the normal starting is ensured, 5-10 times of repeated starting are continuously carried out, the cylinder flooding phenomenon can be successfully avoided after each starting, and the severe shaking phenomenon of the engine is avoided;
5) starting enrichment and dilution; the one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1800rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected.
Furthermore, in the fourth step, in the environment of quantifying the altitude of the engine of the type, the starting performance evaluation index is as follows:
1) starting a cold machine; the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth;
2) starting enrichment and dilution; the one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1400rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected;
3) starting the heat engine; the one-time starting is successful, the starting time is less than 1s, the uprush rotating speed does not exceed 1200rpm, and the rotating speed climbing and falling in the starting process are smooth.
Compared with the prior art, the invention has the beneficial effects that: the technical scheme of the invention is matched with a plurality of electronic injection systems on engines with a plurality of models for full test verification, is suitable for engines with most models and electronic injection systems, quantifies the indexes of the starting performance of the engines under different environments by means of the existing equipment and software, and has real and reliable test and evaluation results. The evaluation method is simple and easy to understand, high in operation execution effectiveness, and in line with the design concepts of universality, low cost, reliability and high efficiency. According to the invention, the starting performance of the engine of the type is evaluated by mastering the starting test method and according to the quantized starting performance index.
Drawings
FIG. 1 is a schematic view of a vehicle of the present invention carrying a 2.0L engine;
FIG. 2 is a schematic diagram of an ECU employed in the present invention;
FIG. 3 is a diagram of the present invention reading and collecting ECU parameters by means of INCA software.
Detailed Description
The first embodiment is as follows: the present embodiment describes a novel method for evaluating engine start-up performance, including the steps of:
the method comprises the following steps: firstly, immersing a vehicle in an environment with high and cold temperature (the atmospheric temperature is-30-10 ℃) to carry out an engine starting test, wherein cold starting, cold start of enrichment and dilution, continuous repeated starting, semi-cold start and hot start are contained in the test; reading and recording the parameter information in the starting process of the engine, screening starting data, and using data processing software MDA to arrange the starting data to obtain the number of engine starting times, starting time, starting uprush rotating speed and fallback data required by evaluation; according to the following principle: the engine is started smoothly without flameout; smooth engine transition from start-up to idle; the rotating speed climbing and falling are smooth and have no abnormal upward stroke and downward stroke; when the engine enters an idle speed, the deviation between the actual rotating speed and the target rotating speed does not exceed plus or minus 50 revolutions, and then the starting performance of the engine is evaluated;
step two: then, the vehicle is immersed in a normal-temperature environment (the atmospheric temperature is 20-30 ℃), the engine is started by the water temperature of the engine under various temperature conditions, starting data are tested and sorted, and the starting performance evaluation indexes of the water temperature of the engine under various temperature conditions in the normal-temperature environment of the engine are quantized as follows: the engine is successfully started once, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling back are smooth in the starting process;
step three: then immersing the vehicle in a high-temperature environment (the atmospheric temperature is more than or equal to 30 ℃), and sequentially carrying out cold start, semi-cold start, heat engine start, repeated start and enrichment and dilution start tests;
step four: and finally, immersing the vehicle in a plateau (the environmental pressure is 55-75 kpa) environment, and sequentially carrying out cold start, enrichment and lean start and heat engine start tests.
Furthermore, in the step one, the starting performance indexes of the engine in the severe cold environment are quantified by combining the tested starting data as follows:
1) the cold start time is defined by the following coolant temperature T range:
when T is more than or equal to-30 ℃, one-time starting is successful, and the starting time is less than or equal to 8 seconds;
when T is more than or equal to-25 ℃, one-time starting is successful, and the starting time is less than or equal to 5 seconds;
when T is more than or equal to-20 ℃, one-time starting is successful, and the starting time is less than or equal to 3 seconds;
when T is more than or equal to-10 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
when T is more than or equal to 0 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
the upper punch rotating speed does not exceed 1850rpm, and the rotating speed climbing and falling back are smooth in the starting process;
2) the evaluation indexes of the starting performance of the enrichment and dilution cold machine are as follows: the one-time starting is successful, a cylinder is not flooded, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling back in the starting process are smooth;
3) the evaluation indexes of the performance of the continuous repeated starting are as follows: the cold start is ensured to be carried out continuously for 5-10 times of repeated start under normal condition, the cylinder is successfully and successfully not flooded each time of start, and the phenomenon of serious shaking of the engine is avoided;
4) the evaluation indexes of the starting performance of the semi-cold machine are as follows: 1-time starting is successful, the starting time is less than 4s, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling in the starting process are smooth;
5) the evaluation indexes of the starting performance of the heat engine are as follows: the starting is successful for 1 time, the starting time is less than 1s, the uprush rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth.
Further, in the third step, in the high-temperature environment of the quantized engine of the type, the starting performance evaluation indexes are as follows:
1) starting a cold machine; the temperature difference between the engine coolant and the air inlet temperature is less than 3 ℃, the one-time starting is successful, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling in the starting process are smooth;
2) starting a semi-cooler; the temperature difference between the engine coolant and the air inlet temperature is larger than 3 ℃, the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling in the starting process are smooth;
3) starting the heat engine; the temperature of the cooling liquid is 80-90 ℃, the starting is successful once, the starting time is less than 1s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling back in the starting process are smooth;
4) repeatedly starting; the method has the advantages that the normal starting is ensured, 5-10 times of repeated starting are continuously carried out, the cylinder flooding phenomenon can be successfully avoided after each starting, and the severe shaking phenomenon of the engine is avoided;
5) starting enrichment and dilution; the one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1800rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected.
Furthermore, in the fourth step, in the environment of quantifying the altitude of the engine of the type, the starting performance evaluation index is as follows:
1) starting a cold machine; the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth;
2) starting enrichment and dilution; the one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1400rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected;
3) starting the heat engine; the one-time starting is successful, the starting time is less than 1s, the uprush rotating speed does not exceed 1200rpm, and the rotating speed climbing and falling in the starting process are smooth.
Example 1:
firstly, the whole vehicle gasoline, engine oil, gearbox oil, storage battery, all accessories and instrument panels in the figure 1 are checked to ensure that the vehicle and the engine are in normal states and meet the requirements. The check confirms the ECU type, software and hardware and calibration version information of fig. 2. And connecting the ECU with calibration software INCA by using a communication line, monitoring and recording various parameters (shown in figure 3) of the whole vehicle and the engine, checking whether the various parameters are normal or not, and if the various parameters are abnormal, solving the fault firstly and then carrying out a starting test.
In a severe cold (the atmospheric temperature is-30-10 ℃), the following engine starting tests are sequentially carried out:
1) cold start test
The cold starting performance of the engine after long-time soaking in different low-temperature environments is examined, the vehicle shown in the figure 1 is respectively soaked in the environment temperature of-31 ℃, 25 ℃, 19 ℃, 15 ℃ and-10 ℃, then the engine is started, and the parameter information of the actual rotating speed, the target rotating speed, the water temperature, the air inlet temperature, the system voltage, the atmospheric pressure and the like of the engine is collected and recorded. The method comprises the steps of starting timing when the system voltage is reduced due to the fact that a starting motor starts to rotate, recovering the system voltage when the rotating speed of an engine is higher than 500rpm, taking the condition that the engine is started successfully and does not stall as a judgment standard, taking the elapsed time as the starting time, taking the highest actual rotating speed of the engine as the uprush rotating speed in the starting process, and processing collected data to obtain information required by evaluation (shown in a table 1). According to the test result, in the high and cold environment of the engine, the cold start performance evaluation indexes are quantized as follows:
the start-up time is defined in terms of the following coolant temperature T range:
when T is more than or equal to-30 ℃, one-time starting is successful, and the starting time is less than or equal to 8 seconds;
when T is more than or equal to-25 ℃, one-time starting is successful, and the starting time is less than or equal to 5 seconds;
when T is more than or equal to-20 ℃, one-time starting is successful, and the starting time is less than or equal to 3 seconds;
when T is more than or equal to-10 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
when T is more than or equal to 0 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
the upper-rushing speed does not exceed 1850rpm, and the rotating speed climbing and falling are smooth in the starting process.
2) Enrichment and enleanment start test
And the successful cold start of the engine under the conditions of high and low quality oil products is ensured by considering different fuel oil qualities. The vehicle shown in fig. 1 is immersed in a cold environment for a long time, and is adjusted to +/-30% on the basis of the original oil injection pulse width, and the starting performance of the engine is tested. The data acquisition was started by respectively testing 30% enrichment at-31 deg.C, 30% dilution at-34 deg.C, 30% enrichment at-24 deg.C, and 30% dilution at-25 deg.C. According to the test result (shown in table 2), in the high and cold environment of the engine, the evaluation indexes of the starting performance of the enrichment and the reduction cold machine are quantized as follows: the one-time starting is successful without flooding the cylinder, the upper-stroke rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling back are smooth and smooth in the starting process.
3) Repeated start-up test at low temperature (-20 ℃ to-10 ℃)
The performance of repeated starting of the engine for multiple times in a low-temperature environment is examined, the vehicle shown in the figure 1 is continuously subjected to 10 repeated starting tests under the normal cold starting condition, the vehicle runs for about 10 seconds in an idling mode after being started successfully every time, and the vehicle is started again after being shut down at an interval of 3-5 seconds. Repeated starting is carried out for 5 times at-20 ℃ and-17 ℃ respectively, and data acquisition is started. According to the test results (as shown in table 3), the repeated starting performance evaluation indexes in the low-temperature environment of the engine of the type are quantified as follows: the cold start is ensured to be carried out continuously for 5-10 times of repeated start under normal condition, the cylinder is successfully and successfully not flooded each time of start, and the phenomenon of serious shaking of the engine is avoided.
4) Starting test of semi-cold machine and heat machine
And (3) checking the driving conditions of the whole vehicle after the vehicle is started and the vehicle is started under the common traffic conditions and the highway driving conditions (including speed change, common acceleration and deceleration, high speed, parking and idling) under different low-temperature environments. In the figure 1, the vehicle is stopped and flamed out for an indefinite time under a low-temperature environment, the difference between the water temperature and the air inlet temperature is more than or equal to 3 ℃, and the engine is started to test and collect data. According to the test result (shown in table 4), the evaluation indexes of the semi-cold start performance in the low-temperature environment of the engine of the type are quantized as follows: 1-time starting is successful, the starting time is less than 4s, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling in the starting process are smooth; the evaluation indexes of the starting performance of the heat engine are as follows: the starting is successful for 1 time, the starting time is less than 1s, the uprush rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth.
In a normal temperature (atmospheric temperature is 20-30 ℃), the engine is started under various temperature conditions by the water temperature of the engine, and the acquired data is processed to obtain information required for evaluation (shown in table 5). According to the test result, the performance evaluation indexes of the starting of the engine water temperature under various temperature conditions in the normal temperature environment of the engine are quantized, the engine is successfully started once, the starting time is less than 1s, the upper-thrust rotating speed is not more than 1800rpm, and the rotating speed in the starting process is smoothly climbed and fallen back.
In a high-temperature environment (the atmospheric temperature is more than or equal to 30 ℃), the vehicle shown in fig. 1 sequentially carries out cold start, semi-cold start, hot start, repeated start and enrichment and lean start tests, and according to test results (shown in table 6), the start performance evaluation indexes in the high-temperature environment of the engine of the type are quantized as follows:
1) cold starting, wherein the difference between the temperature of the engine coolant and the temperature of the intake air is less than 3 ℃, the one-time starting is successful, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling back in the starting process are smooth;
2) starting the semi-cold machine, wherein the difference between the temperature of the cooling liquid of the engine and the temperature of the intake air is more than 3 ℃, the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling back in the starting process are smooth;
3) starting the heat engine, wherein the temperature of cooling liquid is 80-90 ℃, the starting is successful once, the starting time is less than 1s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling in the starting process are smooth;
4) repeated starting is carried out, 5-10 times of repeated starting are continuously carried out under the condition that the conventional starting is normal, the cylinder is successfully and successfully not flooded each time, and the phenomenon of serious shaking of the engine is avoided;
5) the starting of thickening and diluting is successful in one-time starting, a cylinder is not flooded, the uprush rotating speed does not exceed 1800rpm, the rotating speed in the starting process is smooth in climbing and falling, and the change of an accelerator pedal can be quickly reflected.
In the plateau (ambient pressure is 55 ~ 75kpa) environment, the vehicle of figure 1 carries out cold machine start-up, enrichment and enleanment start-up and heat engine start-up test in proper order, according to the test result (as shown in table 7), quantizes in the plateau environment of this type of engine, and the start-up performance evaluation index is:
1) cold starting, wherein one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling back in the starting process are smooth;
2) the thickening and the thinning are started, one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1400rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected;
3) the heat engine is started, one-time starting is successful, the starting time is less than 1s, the upper-thrust rotating speed is not more than 1200rpm, and the rotating speed climbing and falling back in the starting process are smooth.
TABLE 1 Start-Up Performance of Engine Cold Start in high Cold Environment
TABLE 2 Start-Up Performance of Engine enrichment enleanment Cold Start in high Cold Environment
TABLE 3 Start-Up Performance of multiple engine restarts in Low temperature environments
TABLE 4 Start-Up Performance for Engine half-Cold and Heat Start in Low temperature Environment
TABLE 5 Start-Up Performance of Engine Water temperature at various temperatures in Normal temperature Environment
TABLE 6 Start-Up Performance of Engine Start-Up test in high temperature Environment
TABLE 7 Start Performance of Engine Start test in plateau Environment
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.
Claims (8)
1. A novel method for evaluating engine starting performance is characterized in that: the method comprises the following steps:
the method comprises the following steps: firstly, immersing a vehicle in a high and cold environment to carry out an engine starting test, wherein the test content comprises cold starting, enrichment and dilution cold machine starting, continuous repeated starting, semi-cold machine starting and heat machine starting; reading and recording the parameter information in the starting process of the engine, screening starting data, and using data processing software MDA to arrange the starting data to obtain the number of engine starting times, starting time, starting uprush rotating speed and fallback data required by evaluation; according to the following principle: the engine is started smoothly without flameout; smooth engine transition from start-up to idle; the rotating speed climbing and falling are smooth and have no abnormal upward stroke and downward stroke; when the engine enters an idle speed, the deviation between the actual rotating speed and the target rotating speed does not exceed plus or minus 50 revolutions, and then the starting performance of the engine is evaluated;
step two: then the vehicle is immersed in a normal temperature environment, the engine is started by the water temperature of the engine under various temperature conditions, starting data are tested and collated, and the starting performance evaluation indexes of the water temperature of the engine under various temperature conditions in the normal temperature environment of the engine of the type are quantized as follows: the engine is successfully started once, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling back are smooth in the starting process;
step three: then immersing the vehicle in a high-temperature environment, and sequentially carrying out cold start, semi-cold start, heat engine start, repeated start and enrichment and lean start tests;
step four: and finally, immersing the vehicle in a plateau environment, and sequentially carrying out cold start, enrichment and dilution start and heat engine start tests.
2. The novel engine start performance evaluation method of claim 1, wherein: in the first step, the starting performance indexes of the engine in the severe cold environment are quantized by combining the tested starting data as follows:
1) the cold start time is defined by the following coolant temperature T range:
when T is more than or equal to-30 ℃, one-time starting is successful, and the starting time is less than or equal to 8 seconds;
when T is more than or equal to-25 ℃, one-time starting is successful, and the starting time is less than or equal to 5 seconds;
when T is more than or equal to-20 ℃, one-time starting is successful, and the starting time is less than or equal to 3 seconds;
when T is more than or equal to-10 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
when T is more than or equal to 0 ℃, one-time starting is successful, and the starting time is less than or equal to 2 seconds;
the upper punch rotating speed does not exceed 1850rpm, and the rotating speed climbing and falling back are smooth in the starting process;
2) the evaluation indexes of the starting performance of the enrichment and dilution cold machine are as follows: the one-time starting is successful, a cylinder is not flooded, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling back in the starting process are smooth;
3) the evaluation indexes of the performance of the continuous repeated starting are as follows: the cold start is ensured to be carried out continuously for 5-10 times of repeated start under normal condition, the cylinder is successfully and successfully not flooded each time of start, and the phenomenon of serious shaking of the engine is avoided;
4) the evaluation indexes of the starting performance of the semi-cold machine are as follows: 1-time starting is successful, the starting time is less than 4s, the upper punch rotating speed does not exceed 1800rpm, and the rotating speed climbing and falling in the starting process are smooth;
5) the evaluation indexes of the starting performance of the heat engine are as follows: the starting is successful for 1 time, the starting time is less than 1s, the uprush rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth.
3. The novel engine start performance evaluation method of claim 1, wherein: in the third step, in the high-temperature environment of the quantized engine of the type, the starting performance evaluation indexes are as follows:
1) starting a cold machine; the temperature difference between the engine coolant and the air inlet temperature is less than 3 ℃, the one-time starting is successful, the starting time is less than 1s, the upper punch rotating speed is not more than 1800rpm, and the rotating speed climbing and falling in the starting process are smooth;
2) starting a semi-cooler; the temperature difference between the engine coolant and the air inlet temperature is larger than 3 ℃, the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling in the starting process are smooth;
3) starting the heat engine; the temperature of the cooling liquid is 80-90 ℃, the starting is successful once, the starting time is less than 1s, the upper punch rotating speed is not more than 1500rpm, and the rotating speed climbing and falling back in the starting process are smooth;
4) repeatedly starting; the method has the advantages that the normal starting is ensured, 5-10 times of repeated starting are continuously carried out, the cylinder flooding phenomenon can be successfully avoided after each starting, and the severe shaking phenomenon of the engine is avoided;
5) starting enrichment and dilution; the one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1800rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected.
4. The novel engine start performance evaluation method of claim 1, wherein: in the fourth step, in the quantization type engine plateau environment, the starting performance evaluation indexes are as follows:
1) starting a cold machine; the one-time starting is successful, the starting time is less than 2s, the upper punch rotating speed does not exceed 1600rpm, and the rotating speed climbing and falling in the starting process are smooth;
2) starting enrichment and dilution; the one-time starting is successful, a cylinder is not flooded, the upper punching rotating speed does not exceed 1400rpm, the rotating speed climbing and falling back in the starting process are smooth, and the change of an accelerator pedal can be quickly reflected;
3) starting the heat engine; the one-time starting is successful, the starting time is less than 1s, the uprush rotating speed does not exceed 1200rpm, and the rotating speed climbing and falling in the starting process are smooth.
5. The novel engine start performance evaluation method of claim 1, wherein: in the first step, the atmospheric temperature in the alpine environment is-30-10 ℃.
6. The novel engine start performance evaluation method of claim 1, wherein: in the second step, the atmospheric temperature in the normal temperature environment is 20-30 ℃.
7. The novel engine start performance evaluation method of claim 1, wherein: in the third step, the atmospheric temperature in the high-temperature environment is more than or equal to 30 ℃.
8. The novel engine start performance evaluation method of claim 1, wherein: in the fourth step, the environmental pressure in the plateau environment is 55-75 kpa.
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Application publication date: 20210907 |