Pems test method and system for a sweeper engine

Abstract

The application provides a PEMS testing method and system for a sweeper engine, the method comprising: obtaining an engine model corresponding to a target sweeper, and building an engine test bench according to the engine model, and installing and debugging a PEMS device on the engine test bench; obtaining all operation modes related to the target sweeper, and testing the engine test bench according to a test condition corresponding to each operation mode; monitoring rotational speed data and emission data of the engine test bench in each test process, and evaluating a PEMS emission result of the sweeper according to the rotational speed data and the emission data. The PEMS testing method for the sweeper engine can greatly shorten a non-road emission test time of the sweeper by simulating actual road operation conditions of the sweeper.

Description

Technical Field

[0001] This invention relates to the field of PEMS testing technology, and in particular to a PEMS testing method and system for a sweeper engine. Background Technology

[0002] As emission regulations become increasingly stringent for non-road mobile machinery, whole-vehicle PEMS (Portable Emissions Testing System) testing is required to determine the vehicle's emission levels under actual operating conditions, thereby further reducing overall vehicle emissions. Traditional EMS testing methods for sweepers fail to reflect their emission characteristics under real-world operating conditions, exhibiting poor repeatability, limited operability, and complexity. Currently, an effective method for PEMS testing of sweepers is lacking. Summary of the Invention

[0003] Based on this, the purpose of this invention is to propose a PEMS testing method and system for sweeper engines, which simulates the actual road operation conditions of sweepers for testing. The test has good repeatability and strong operability, and can greatly reduce the non-road emission testing time of sweepers.

[0004] According to the present invention, a PEMS testing method for a sweeper engine is provided, the method comprising:

[0005] Obtain the engine model corresponding to the target sweeper, build an engine test bench according to the engine model, and install and debug PEMS equipment on the engine test bench;

[0006] All operating modes related to the target sweeper are acquired, and the engine test bench is tested according to the test conditions corresponding to each operating mode.

[0007] The engine speed and emissions data of the test bench are monitored during each test to evaluate the PEMS emissions results of the sweeper based on the speed and emissions data.

[0008] In summary, based on the aforementioned PEMS testing method for sweeper truck engines, a set of standard off-road testing rules is established by simulating the actual road operating conditions of sweeper trucks. This allows for the rapid acquisition of PEMS emission results from sweeper truck engines, significantly reducing off-road emission testing time. Specifically, the engine model corresponding to the target sweeper truck for this test is first obtained. Then, an engine test bench is built based on this engine model, and the PEMS equipment is installed and debugged on the bench. Next, the operating modes related to the target sweeper truck are obtained, and the engine test bench is simulated and tested according to the test conditions under each operating mode. This effectively monitors the relevant test data from the engine test bench, thereby evaluating the PEMS emission results of the sweeper truck. The entire testing process is highly repeatable, operable, and easy to use.

[0009] Furthermore, the operating modes include a first operating mode and a second operating mode. The step of acquiring all operating modes related to the target sweeper, and testing the engine test bench according to the test conditions corresponding to each operating mode, includes:

[0010] According to the engine model, the first operating mode data and the second operating mode data corresponding to the target sweeper are obtained from the preset torque data table. The first operating mode data includes a first preset initial torque value and a first preset torque increment corresponding to the first preset initial torque value. The second operating mode data includes a second preset initial torque value and a second preset torque increment corresponding to the second preset initial torque value.

[0011] The vacuum suction head in the engine test bench is opened according to the first preset initial torque value, and the applied torque of the engine test bench is increased by the first preset torque increment every first preset time interval.

[0012] Furthermore, the step of acquiring all operating modes related to the target sweeper, and testing the engine test bench according to the test conditions corresponding to each operating mode, further includes:

[0013] The vacuum suction head and roller brush in the engine test bench are simultaneously opened according to the second preset initial torque value, and the applied torque of the engine test bench is increased every second preset time interval by the second preset torque increment.

[0014] Furthermore, the step of acquiring all operating modes related to the target sweeper, and testing the engine test bench according to the test conditions corresponding to each operating mode, further includes:

[0015] Determine whether the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode;

[0016] If the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode, the engine test bench will be controlled to repeat the test according to the test conditions corresponding to the current working mode.

[0017] Furthermore, the step of controlling the engine test bench to repeat the test according to the test conditions corresponding to the current working mode if the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode includes:

[0018] The power output of the engine test bench is obtained, and it is determined whether the power output of the engine test bench reaches the preset multiple of the engine cycle power, or the duration of the engine test bench in the current working mode is obtained, and it is determined whether the duration reaches the first preset duration threshold.

[0019] If the power output of the engine test bench reaches a preset multiple of the engine cycle power or the duration reaches a first preset duration threshold, then the test data of the engine test bench during each test is acquired.

[0020] Furthermore, the step of monitoring the engine speed data and emission data of the engine test bench during each test, and evaluating the PEMS emission results of the sweeper vehicle based on the speed data and emission data, includes:

[0021] The output power of the target sweeper in two working modes is calculated based on the rotation speed data, and the emission ratio of each pollutant is calculated based on the emission data and output power.

[0022] Further, the emission data includes the emissions of CO, NO, and NO2. The step of calculating the output power of the target sweeper in two operating modes based on the rotation speed data, and calculating the emission ratio of each pollutant based on the emission data and output power, includes:

[0023] The emission ratio of each pollutant is calculated using the following formula:

[0024] e px =m x / (W i -W i-1 )

[0025] Among them, e px m represents the emission ratio corresponding to the xth pollutant. x Indicates the first

[0026] The emissions corresponding to x pollutants, W iW represents the output of the i-th iteration. i-1 This represents the output of the (i-1)th iteration, (W) i -W i-1 ) indicates the output of the current loop.

[0027] In another aspect, the present invention also proposes a PEMS testing system for a sweeper engine, the system comprising:

[0028] The test bench construction module is used to obtain the engine model corresponding to the target sweeper, build an engine test bench according to the engine model, and install and debug PEMS equipment on the engine test bench.

[0029] The test execution module is used to acquire all operating modes related to the target sweeper, so as to test the engine test bench according to the test conditions corresponding to each operating mode;

[0030] The emissions assessment module is used to monitor the engine speed data and emissions data of the engine test bench during each test, so as to evaluate the PEMS emissions results of the sweeper based on the speed data and emissions data.

[0031] Furthermore, the test execution module also includes:

[0032] The test condition acquisition unit is used to acquire, from the preset torque data table, first operation mode data and second operation mode data corresponding to the target sweeper according to the engine model. The first operation mode data includes a first preset initial torque value and a first preset torque increment corresponding to the first preset initial torque value. The second operation mode data includes a second preset initial torque value and a second preset torque increment corresponding to the second preset initial torque value.

[0033] The first operating mode control unit is used to control the vacuum suction head in the engine test bench to open according to the first preset initial torque value, and to increase the applied torque of the engine test bench by the first preset torque increment every first preset time interval.

[0034] Furthermore, the test execution module also includes:

[0035] The second operating mode control unit is used to control the vacuum suction head and roller brush in the engine test bench to open simultaneously according to the second preset initial torque value, and to increase the applied torque of the engine test bench by the second preset torque increment every second preset time.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by means of embodiments of the invention. Attached Figure Description

[0037] Figure 1 This is a flowchart of the PEMS testing method for a sweeper engine proposed in the first embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the PEMS testing system for a sweeper engine proposed in the second embodiment of the present invention.

[0039] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0040] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Please see Figure 1 The diagram shows a flowchart of a method for evaluating the quality of a car door closing in the first embodiment of the present invention. The method includes steps S01 to S03, wherein:

[0043] Step S01: Obtain the engine model corresponding to the target sweeper, build an engine test bench according to the engine model, and install and debug the PEMS equipment on the engine test bench;

[0044] Understandably, there are many different types of sweepers on the market, and the engines matched with different models of sweepers are generally different. Based on this, in order to accurately evaluate the PEMS emission results of each model of sweeper, this step first requires obtaining the engine model corresponding to the sweeper so as to accurately formulate the corresponding test standards for each model of sweeper.

[0045] Step S02: Obtain all operating modes related to the target sweeper, and test the engine test bench according to the test conditions corresponding to each operating mode;

[0046] In this step, it is first necessary to obtain the first operating mode data and the second operating mode data corresponding to the target sweeper from the preset torque data table according to the engine model. The first operating mode data includes a first preset initial torque value and a first preset torque increment corresponding to the first preset initial torque value. The second operating mode data includes a second preset initial torque value and a second preset torque increment corresponding to the second preset initial torque value.

[0047] In the first operating mode: the vacuum suction head in the engine test bench is opened according to the first preset initial torque value, and the applied torque of the engine test bench is increased every first preset time interval by the first preset torque increment.

[0048] In the second operating mode: the vacuum suction head and roller brush in the engine test bench are simultaneously opened according to the second preset initial torque value, and the applied torque of the engine test bench is increased every second preset time by the second preset torque increment.

[0049] For illustrative purposes only, and not as a limitation, in this embodiment, the first preset initial torque value is 1400 r / min, the second preset initial torque value is 1500 r / min, the first preset torque increment and the second preset torque increment are 100 r / min and 200 r / min respectively, and the first preset time and the second preset time refer to the running time under the current torque. In this embodiment, the first preset time and the second preset time are the same, both being 6 minutes. For example, after the engine test bench runs at 1400 r / min for 6 minutes, the applied torque is changed to 100 r / min, and so on, continuously increasing the torque for testing.

[0050] Furthermore, it is determined whether the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode. If the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode, the engine test bench is controlled to repeat the test according to the test conditions corresponding to the current working mode.

[0051] Understandably, when the applied torque increases to the torque threshold corresponding to the current operating mode, it means that the engine test bench is in the highest gear of the current operating mode, and therefore it is necessary to control the engine test bench to repeat the test according to the initial torque.

[0052] Furthermore, when performing cyclic testing on the engine test bench, it is necessary to obtain the power output of the engine test bench and determine whether the power output of the engine test bench reaches the preset multiple of the engine cyclic power, or obtain the duration of the engine test bench in the current working mode to determine whether the duration reaches the first preset duration threshold.

[0053] If the power output of the engine test bench reaches a preset multiple of the engine cycle power or the duration reaches a first preset duration threshold, then the test data of the engine test bench during each test is acquired.

[0054] It should be noted that in this embodiment, the preset multiplier is 5-7 times, and the first preset duration threshold is 2 hours.

[0055] Step S03: Monitor the engine speed data and emission data of the engine test bench during each test, so as to evaluate the PEMS emission results of the sweeper based on the engine speed data and the emission data.

[0056] In this step, it is first necessary to calculate the output power of the target sweeper in two working modes based on the rotation speed data, and then calculate the emission ratio of each pollutant based on the emission data and output power.

[0057] Specifically, the emission ratio of each pollutant is calculated using the following formula:

[0058] e px =m x / (W i -W i-1 )

[0059] Among them, e px m represents the emission ratio corresponding to the xth pollutant. x Indicates the first

[0060] The emissions corresponding to x pollutants, W i W represents the output of the i-th iteration. i-1 This represents the output of the (i-1)th iteration, (W) i -W i-1 ) indicates the output of the current loop.

[0061] Understandably, the emission data includes the emissions of CO, NO, and NO2. After obtaining the emission ratios of the three pollutants, CO, NO, and NO2, the PEMS emission results are then obtained.

[0062] In summary, based on the aforementioned PEMS testing method for sweeper truck engines, a set of standard off-road testing rules is established by simulating the actual road operating conditions of sweeper trucks. This allows for the rapid acquisition of PEMS emission results from sweeper truck engines, significantly reducing off-road emission testing time. Specifically, the engine model corresponding to the target sweeper truck for this test is first obtained. Then, an engine test bench is built based on this engine model, and the PEMS equipment is installed and debugged on the bench. Next, the operating modes related to the target sweeper truck are obtained, and the engine test bench is simulated and tested according to the test conditions under each operating mode. This effectively monitors the relevant test data from the engine test bench, thereby evaluating the PEMS emission results of the sweeper truck. The entire testing process is highly repeatable, operable, and easy to use.

[0063] Please see Figure 2 The diagram shows a schematic of the PEMS testing system for a sweeper engine according to a second embodiment of the present invention. The system includes:

[0064] Test bench construction module 10 is used to obtain the engine model corresponding to the target sweeper, build an engine test bench according to the engine model, and install and debug PEMS equipment on the engine test bench.

[0065] Test execution module 20 is used to acquire all operating modes related to the target sweeper, so as to test the engine test bench according to the test conditions corresponding to each operating mode;

[0066] Furthermore, the test execution module 20 also includes:

[0067] The test condition acquisition unit is used to acquire, from the preset torque data table, first operation mode data and second operation mode data corresponding to the target sweeper according to the engine model. The first operation mode data includes a first preset initial torque value and a first preset torque increment corresponding to the first preset initial torque value. The second operation mode data includes a second preset initial torque value and a second preset torque increment corresponding to the second preset initial torque value.

[0068] The first operating mode control unit is used to control the vacuum suction head in the engine test bench to open according to the first preset initial torque value, and to increase the applied torque of the engine test bench by the first preset torque increment every first preset time.

[0069] The second operating mode control unit is used to control the vacuum suction head and roller brush in the engine test bench to open simultaneously according to the second preset initial torque value, and to increase the applied torque of the engine test bench by the second preset torque increment every second preset time.

[0070] The torque judgment unit is used to determine whether the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode.

[0071] The repeat test unit is used to control the engine test bench to repeat the test according to the test conditions corresponding to the current working mode if the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode.

[0072] Furthermore, the repeatability test unit also includes:

[0073] The cycle test monitoring subunit is used to acquire the power output of the engine test bench and determine whether the power output of the engine test bench reaches the preset multiple of the engine cycle power, or to acquire the duration of the engine test bench in the current working mode and determine whether the duration reaches the first preset duration threshold.

[0074] The cycle test determination subunit is used to acquire the test data of the engine test bench during each test if the power output of the engine test bench reaches a preset multiple of the engine cycle power or the duration reaches a first preset duration threshold.

[0075] The emission assessment module 30 is used to monitor the engine speed data and emission data of the engine test bench during each test, so as to evaluate the PEMS emission results of the sweeper based on the speed data and emission data.

[0076] Furthermore, the emissions assessment module 30 also includes:

[0077] The emission ratio calculation unit is used to calculate the output power of the target sweeper in two working modes based on the rotation speed data, and to calculate the emission ratio of each pollutant based on the emission data and the output power.

[0078] The emission ratio of each pollutant is calculated using the following formula:

[0079] e px =m x / (W i -W i-1 )

[0080] Among them, e px m represents the emission ratio corresponding to the xth pollutant. x Indicates the first

[0081] The emissions corresponding to x pollutants, W i W represents the output of the i-th iteration. i-1 This represents the output of the (i-1)th iteration, (W) i -W i-1 ) indicates the output of the current loop.

[0082] In summary, based on the aforementioned PEMS testing system for sweeper truck engines, a set of standard off-road testing rules is established by simulating the actual road operating conditions of sweeper trucks. This allows for the rapid acquisition of PEMS emission results for sweeper truck engines, significantly reducing off-road emission testing time. Specifically, the system first obtains the engine model corresponding to the target sweeper truck for this test. Then, an engine test bench is built based on this engine model, and the PEMS equipment is installed and debugged on the bench. Next, the operating modes related to the target sweeper truck are obtained, and the engine test bench is simulated and tested according to the test conditions under each operating mode. This effectively monitors the relevant test data of the engine test bench, thereby evaluating the PEMS emission results of the sweeper truck. The entire testing process is highly repeatable, operable, and easy to use.

[0083] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A PEMS testing method for a sweeper truck engine, characterized in that, The method includes: Obtain the engine model corresponding to the target sweeper, build an engine test bench according to the engine model, and install and debug PEMS equipment on the engine test bench; All operating modes related to the target sweeper are acquired, and the engine test bench is tested according to the test conditions corresponding to each operating mode. The operating modes include a first operating mode and a second operating mode. The step of acquiring all operating modes related to the target sweeper and testing the engine test bench according to the test conditions corresponding to each operating mode includes: According to the engine model, the first operating mode data and the second operating mode data corresponding to the target sweeper are obtained from the preset torque data table. The first operating mode data includes a first preset initial torque value and a first preset torque increment corresponding to the first preset initial torque value. The second operating mode data includes a second preset initial torque value and a second preset torque increment corresponding to the second preset initial torque value. The vacuum suction head in the engine test bench is opened according to the first preset initial torque value, and the applied torque of the engine test bench is increased by the first preset torque increment every first preset time interval. The engine speed and emissions data of the test bench are monitored during each test to evaluate the PEMS emissions results of the sweeper based on the speed and emissions data.

2. The PEMS test method for a sweeper engine according to claim 1, characterized in that, The step of acquiring all operating modes related to the target sweeper, and testing the engine test bench according to the test conditions corresponding to each operating mode, further includes: The vacuum suction head and roller brush in the engine test bench are simultaneously opened according to the second preset initial torque value, and the applied torque of the engine test bench is increased every second preset time interval by the second preset torque increment.

3. The PEMS test method for a sweeper engine according to claim 2, characterized in that, The step of acquiring all operating modes related to the target sweeper, and testing the engine test bench according to the test conditions corresponding to each operating mode, further includes: Determine whether the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode; If the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode, the engine test bench will be controlled to repeat the test according to the test conditions corresponding to the current working mode.

4. The PEMS test method for a sweeper engine according to claim 3, characterized in that, The step of controlling the engine test bench to repeat the test according to the test conditions corresponding to the current working mode if the current torque of the target sweeper is greater than the torque threshold corresponding to the current working mode includes: The power output of the engine test bench is obtained, and it is determined whether the power output of the engine test bench reaches the preset multiple of the engine cycle power, or the duration of the engine test bench in the current working mode is obtained, and it is determined whether the duration reaches the first preset duration threshold. If the power output of the engine test bench reaches a preset multiple of the engine cycle power or the duration reaches a first preset duration threshold, then the test data of the engine test bench during each test is acquired.

5. The PEMS test method for a sweeper engine according to claim 3, characterized in that, The step of monitoring the engine speed data and emission data of the test bench during each test, and evaluating the PEMS emission results of the sweeper truck based on the speed data and emission data, includes: The output power of the target sweeper in two working modes is calculated based on the rotation speed data, and the emission ratio of each pollutant is calculated based on the emission data and output power.

6. The PEMS test method for a sweeper engine according to claim 3, characterized in that, The emission data includes the emissions of CO, NO, and NO2. The steps of calculating the output power of the target sweeper in two operating modes based on the rotation speed data, and calculating the emission ratio of each pollutant based on the emission data and output power, include: The emission ratio of each pollutant is calculated using the following formula: in, Indicates the first The emission ratio corresponding to each pollutant Indicates the first The emissions corresponding to each type of pollutant Indicates the first Output work in the next loop Indicates the first Output work in the next loop This indicates the output of the current loop.

7. A PEMS testing system for a sweeper truck engine, characterized in that, The system includes: The test bench construction module is used to obtain the engine model corresponding to the target sweeper, build an engine test bench according to the engine model, and install and debug PEMS equipment on the engine test bench. The test execution module is used to acquire all operating modes related to the target sweeper, so as to test the engine test bench according to the test conditions corresponding to each operating mode; The test execution module also includes: The test condition acquisition unit is used to acquire, from the preset torque data table, first operation mode data and second operation mode data corresponding to the target sweeper according to the engine model. The first operation mode data includes a first preset initial torque value and a first preset torque increment corresponding to the first preset initial torque value. The second operation mode data includes a second preset initial torque value and a second preset torque increment corresponding to the second preset initial torque value. The first operating mode control unit is used to control the vacuum suction head in the engine test bench to open according to the first preset initial torque value, and to increase the applied torque of the engine test bench by the first preset torque increment every first preset time. The emissions assessment module is used to monitor the engine speed data and emissions data of the engine test bench during each test, so as to evaluate the PEMS emissions results of the sweeper based on the speed data and emissions data.

8. The PEMS testing system for a sweeper engine according to claim 7, characterized in that, The test execution module also includes: The second operating mode control unit is used to control the vacuum suction head and roller brush in the engine test bench to open simultaneously according to the second preset initial torque value, and to increase the applied torque of the engine test bench by the second preset torque increment every second preset time.

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