A diesel engine test system and method with dual-axis force output

Abstract

The present application discloses a diesel engine test system and method with dual-axis force output. The test system includes a host computer, a first PID controller, a second PID controller, a first dynamometer, a second dynamometer, a first connecting shaft, and a second connecting shaft. The diesel engine is provided with a main output shaft and an auxiliary output shaft. The main output shaft is connected to the second dynamometer through the second connecting shaft, and the auxiliary output shaft is connected to the first dynamometer through the first connecting shaft. The host computer is connected to control the first PID controller and the second PID controller through a communication line. The first PID controller is connected to the first dynamometer through a first signal line, and the second PID controller is connected to the second dynamometer through a second signal line. Using the test method of the above test system, the reliability index of the diesel engine is tested through 1000 cycle operations. This test method has reference value for the mechanical reliability tests of other dual-axis power output.

Description

Technical Field

[0001] The present application relates to a diesel engine test system and method with dual-axis force output, and relates to the technical field of diesel engine axial force output reliability testing. Background Art

[0002] In most application scenarios, the shaft force output of a diesel engine is a single main shaft output. Although there is a gear system that can transmit the engine's own accessories, such as the fuel pump, oil pump, and air compressor, the diesel engine outputs torque to the outside through the crankshaft, i.e., the main output torque. Therefore, regarding the test methods for diesel engines, both the national standard and the industry standard focus on single power output, and the existing test methods cannot cope with the scenario of dual-shaft force output of diesel engines. Summary of the invention

[0003] The purpose of the present application is to provide a test method for a diesel engine with dual-axis force output, which can effectively perform reliability tests on a diesel engine with dual-axis force output.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present application is to provide a diesel engine test system with dual-axis force output, characterized in that it includes a host computer, a first PID controller, a second PID controller, a first dynamometer, a second dynamometer, a first connecting shaft, and a second connecting shaft; the diesel engine is provided with a main output shaft and an auxiliary output shaft, the main output shaft is connected to the second dynamometer through the second connecting shaft, the auxiliary output shaft is connected to the first dynamometer through the first connecting shaft, the host computer controls the first PID controller and the second PID controller through a communication line, the first PID controller is connected to the first dynamometer through a first signal line, and the second PID controller is connected to the second dynamometer through a second signal line.

[0005] Using the above test system, the steps of the diesel engine test method with dual-axis force output are as follows:

[0006] Step 1: The diesel engine enters the starting condition and runs for 50 seconds. The start counters m and n are assigned to 0. The diesel engine is in the idling state. Both the first dynamometer and the second dynamometer are not loaded.

[0007] Step 2: The diesel engine enters the no-load condition and runs for 180 seconds. The diesel engine runs at the rated speed ne. The second dynamometer controls the diesel engine throttle position to 50%, and the first dynamometer controls the auxiliary output shaft torque to 20% under the corresponding condition.

[0008] Step 3: The diesel engine enters the parking no-load condition and runs for 60 seconds. The diesel engine is in the idling state. The second dynamometer controls the diesel engine throttle position to 5%, and the first dynamometer controls the auxiliary output shaft torque to 5% under the corresponding condition.

[0009] Step 4: The diesel engine enters the parking and loading condition and runs for 180 seconds. The diesel engine runs at the maximum torque speed nm , the second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 80% of the auxiliary output shaft torque under the corresponding working conditions;

[0010] Step 5: The diesel engine enters the parked full-load condition and runs for 45 seconds. The diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 100% of the auxiliary output shaft torque under the corresponding working conditions;

[0011] Step 6: The diesel engine enters the driving full-load condition and runs for 180 seconds. Start counting m = m + 1. When m < 13, jump to Step 5 until m = 13, and then enter Step 7;

[0012] At this time, the diesel engine runs at the rated speed n e , the second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 100% of the auxiliary output shaft torque under the corresponding working conditions;

[0013] Step 7: The diesel engine enters the parked load-reducing condition and runs for 120 seconds. The diesel engine runs at the maximum torque speed n m , the second dynamometer controls the diesel engine throttle position at 80%, and the first dynamometer controls 70% of the auxiliary output shaft torque under the corresponding working conditions;

[0014] Step 8: The diesel engine enters the parked no-load condition and runs for 85 seconds. Start counting n = n + 1. When n < 1000, jump to Step 2 until n = 1000, and then enter Step 9; One cycle totals 3600 seconds, and 1000 cycles are 1000 hours;

[0015] At this time, the diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 5%, and the first dynamometer controls 5% of the auxiliary output shaft torque under the corresponding working conditions;

[0016] Step 9: The diesel engine enters the shutdown condition, and the test ends.

[0017] Specifically, the sum of the powers of the first dynamometer and the second dynamometer satisfies the external characteristic power curve of the diesel engine.

[0018] The advantage of this application is that the test method provided by this application tests the reliability index of the diesel engine through 1000 cycles of operation. This test method has reference value for the reliability tests of other machinery with double-axis power output. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a diesel engine test system with double-axis force output;

[0020] Figure 2 It is a flowchart of the steps of the test method for a diesel engine with double-axis force output;

[0021] Reference numerals: host computer 1, first PID controller 2, first signal line 3, first dynamometer 4, first connecting shaft 5, diesel engine 6, second connecting shaft 7, second dynamometer 8, second signal line 9, second PID controller 10, communication line 11. Detailed implementation mode

[0022] To make the present application more obvious and easy to understand, the following is a detailed description with preferred embodiments and in conjunction with the attached drawings.

[0023] This embodiment provides a diesel engine test system with dual-axis force output, as Figure 1 shown, including a host computer 1, a first PID controller 2, a second PID controller 10, a first dynamometer 4, a second dynamometer 8, a first connecting shaft 5, a second connecting shaft 7, and a diesel engine 6;

[0024] The diesel engine 6 is provided with two torque output shafts. The auxiliary output shaft is connected to the first dynamometer 4 through the first connecting shaft 5, the main output shaft is connected to the second dynamometer 8 through the second connecting shaft 7. The host computer 1 is connected to control the first PID controller 2 and the second PID controller 10 through the communication line 11. The first PID controller 2 is connected to the first dynamometer 4 through the first signal line 3, and the second PID controller 10 is connected to the second dynamometer 8 through the second signal line 9;

[0025] The second dynamometer 8 controls the main output of the diesel engine through the second PID controller 10, and the first dynamometer 4 controls the auxiliary output of the diesel engine through the first PID controller 2.

[0026] The host computer 1 controls the two-axis force output of the diesel engine through two PID controllers in the form of a program for the test method.

[0027] Specifically, referring to Figure 2 , the steps of the test method are as follows:

[0028] Step 1: The diesel engine enters the starting condition and runs for 50 seconds. The counters m and n are assigned the value of 0. The diesel engine is in the idle state, and neither the first dynamometer nor the second dynamometer is loaded.

[0029] Step 2: The diesel engine enters the driving no-load condition and runs for 180 seconds. The diesel engine runs at the rated speed n e , the second dynamometer controls the throttle position of the diesel engine at 50%, and the first dynamometer controls 20% of the torque of the auxiliary output shaft under the corresponding condition.

[0030] Step 3: The diesel engine enters the parking no-load condition and runs for 60 seconds. The diesel engine is in the idle state. The second dynamometer controls the throttle position of the diesel engine at 5%, and the first dynamometer controls 5% of the torque of the auxiliary output shaft under the corresponding condition.

[0031] Step 4: The diesel engine enters the parked loaded condition and runs for 180 seconds. The diesel engine runs at the maximum torque speed n m , the second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 80% of the auxiliary output shaft torque under the corresponding condition.

[0032] Step 5: The diesel engine enters the parked full load condition and runs for 45 seconds. The diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 100% of the auxiliary output shaft torque under the corresponding condition.

[0033] Step 6: The diesel engine enters the driving full load condition and runs for 180 seconds. Start counting m = m + 1. When m < 13, jump to Step 5 until m = 13, and then enter Step 7.

[0034] At this time, the diesel engine runs at the rated speed n e , the second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 100% of the auxiliary output shaft torque under the corresponding condition.

[0035] Step 7: The diesel engine enters the parked unloading condition and runs for 120 seconds. The diesel engine runs at the maximum torque speed n m , the second dynamometer controls the diesel engine throttle position at 80%, and the first dynamometer controls 70% of the auxiliary output shaft torque under the corresponding condition.

[0036] Step 8: The diesel engine enters the parked no-load condition and runs for 85 seconds. Start counting n = n + 1. When n < 1000, jump to Step 2 until n = 1000, and then enter Step 9. One cycle totals 3600 seconds, and 1000 cycles are 1000 hours.

[0037] At this time, the diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 5%, and the first dynamometer controls 5% of the auxiliary output shaft torque under the corresponding condition.

[0038] Step 9: The diesel engine enters the shutdown condition and the test ends.

[0039] The sum of the powers of the first dynamometer 4 and the second dynamometer 8 satisfies the external characteristic power curve of the diesel engine.

[0040] The specific test data are shown in the following table:

[0041] Step Name Serial Number Rotational Speed rpm Throttle Position % Torque % Time s Accumulated Time s Starting Condition 1 Idle 0 0 50 50 Running No Load 2 Rated Speed 50 20 180 230 Parked No Load 3 Idle 5 5 60 290 Parked Loaded 4 Maximum Torque Speed 100 80 180 470 Parked Full Load 5 Idle 100 100 45 515 Running Full Load 6 Rated Speed 100 100 180 695 Parked Unloaded 7 Maximum Torque Speed 80 70 120 3515 Parked No Load 8 Idle 5 5 85 3600 Shutdown 9 0 0 0 0 3600

[0042] Table 1 Program steps and time allocation for the test method of a diesel engine with dual-axis force output

[0043] The operating condition data and time allocation in the table are derived from the statistical analysis of the scenario application data, which represents the road condition representativeness of one cycle. And running 1000 cycles is for testing the reliability index of the diesel engine. This test method has reference value for the reliability tests of other mechanical devices with double-axis power output.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A test method for a diesel engine with dual-axis force output, characterized in that, the diesel engine (6) is provided with a main output shaft and an auxiliary output shaft. The main output shaft is connected to a second dynamometer (8) through a second connecting shaft (7), and the auxiliary output shaft is connected to a first dynamometer (4) through a first connecting shaft (5); The steps are as follows: Step 1: The diesel engine enters the starting condition and runs for 50 seconds. The counters m and n are assigned the value of 0. The diesel engine is in the idle state, and neither the first dynamometer nor the second dynamometer is loaded; Step 2: The diesel engine enters the no-load running condition, runs for 180 seconds, and the diesel engine runs at the rated speed n e , the second dynamometer controls the diesel engine throttle position at 50%, and the first dynamometer controls 20% of the auxiliary output shaft torque under the corresponding working condition; Step 3: The diesel engine enters the parked no-load condition and runs for 60 seconds. The diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 5%, and the first dynamometer controls 5% of the auxiliary output shaft torque under the corresponding condition; Step 4: The diesel engine enters the parked load condition and runs for 180 seconds. The diesel engine runs at the maximum torque speed n m , the second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 80% of the auxiliary output shaft torque under the corresponding condition; Step 5: The diesel engine enters the parked full-load condition and runs for 45 seconds. The diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 100% of the auxiliary output shaft torque under the corresponding condition; Step 6: The diesel engine enters the driving full-load condition and runs for 180 seconds. Start counting m = m + 1. When m < 13, jump to Step 5 until m = 13, and then enter Step 7; At this time, the diesel engine is running at the rated speed n e , the second dynamometer controls the diesel engine throttle position at 100%, and the first dynamometer controls 100% of the auxiliary output shaft torque under the corresponding working conditions; Step 7: The diesel engine enters the parking load reduction condition and runs for 120 seconds. The diesel engine runs at the maximum torque speed n m , the second dynamometer controls the diesel engine throttle position at 80%, and the first dynamometer controls 70% of the auxiliary output shaft torque under the corresponding condition; Step 8: The diesel engine enters the parked no-load condition and runs for 85 seconds. Start counting n = n + 1. When n < 1000, jump to Step 2 until n = 1000, and then enter Step 9. A cycle totals 3600 seconds, and 1000 cycles are 1000 hours; At this time, the diesel engine is in the idle state. The second dynamometer controls the diesel engine throttle position at 5%, and the first dynamometer controls 5% of the auxiliary output shaft torque under the corresponding condition; Step 9: The diesel engine enters the shutdown condition, and the test ends.

2. The test method for a diesel engine with dual-axis force output according to claim 1, characterized in that, the sum of the powers of the first dynamometer and the second dynamometer satisfies the external characteristic power curve of the diesel engine.

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