CN111665052B - Engine front end wheel train accessory durability test method - Google Patents
Engine front end wheel train accessory durability test method Download PDFInfo
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- CN111665052B CN111665052B CN202010419998.4A CN202010419998A CN111665052B CN 111665052 B CN111665052 B CN 111665052B CN 202010419998 A CN202010419998 A CN 202010419998A CN 111665052 B CN111665052 B CN 111665052B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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Abstract
A durability test method for a front-end wheel train accessory of an engine comprises the steps of respectively connecting an air conditioner compressor, a generator, a power steering pump and an air pump on the engine with corresponding load loading equipment, carrying out a durability test of cyclic loading and unloading on the air conditioner compressor, the generator, the power steering pump and the air pump under the working conditions that the engine is in an idle state and the ambient temperature is 60-70 ℃, and finally judging the durability of the air conditioner compressor, the power steering pump, the generator and the air pump before and after the test and in the test process. The design not only has uniform examination conditions, but also is rapid and accurate.
Description
Technical Field
The invention belongs to the field of automobile engine testing, and particularly relates to a durability test method for an engine front-end wheel train accessory.
Background
The actual use temperature of the front end wheel-train accessories of the automobile engine is high, and in order to ensure the reliability of the front end wheel-train accessories of the engine, a durability test is usually required. At present, in the process of durability test verification of an engine, a bench test assessment method with corresponding pertinence is lacked for assessment of front-end wheel train accessories, other conventional durability tests or whole vehicle road durability tests are carried for assessment, the durability assessment conditions are not strict and long in period, the assessment conditions are not uniform, and the purpose of durability assessment verification of the front-end wheel train accessories cannot be well achieved. Therefore, it is necessary to develop a durability test method for front-end wheel-train accessories of an engine, which is used for meeting the requirement of an examination test for the front-end wheel-train accessories of the engine.
Disclosure of Invention
The invention aims to provide an engine front end wheel train accessory durability test method which is accurate, rapid and uniform in examination conditions, aiming at the problems in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
referring to fig. 1-4, a durability test method for a front-end wheel train accessory of an engine sequentially comprises the following steps:
the first step is as follows: the engine is arranged on the rack and is respectively connected with an air conditioner compressor and an air conditioner compressor load loading device on the engine, a power steering pump and a power steering pump load loading device on the engine, a generator and a generator load loading device on the engine, and an air pump loading device on the engine;
the second step is that: the endurance test of the air conditioner compressor, the generator, the power steering pump and the air pump is carried out under the working conditions that the engine is in an idle state and the ambient temperature is 60-70 ℃, wherein,
the endurance test of the air conditioner compressor is as follows: firstly, starting the load loading equipment of the air conditioner compressor to load the air conditioner compressor to the maximum load for A seconds, then closing the load loading equipment of the air conditioner compressor for A seconds, then starting the load loading equipment of the air conditioner compressor to load the air conditioner compressor to the maximum load for A seconds, and sequentially circulating until the endurance test is finished;
the endurance test of the power steering pump is as follows: starting the power-assisted steering pump load loading equipment to load the power-assisted steering pump to the maximum load for B seconds, then closing the power-assisted steering pump load loading equipment for C seconds, then starting the power-assisted steering pump load loading equipment to load the power-assisted steering pump 3 to the maximum load for B seconds, and sequentially circulating until the endurance test is finished;
the durability test of the generator refers to: the generator load loading equipment loads the generator to the maximum load current of the generator for D hours, then carries the generator to the small load loading current of X amperes for E hours, then loads the generator to the maximum load current of the generator for D hours, and sequentially circulates until the endurance test is finished;
the endurance test of the air pump refers to: adjusting the opening of a release valve installed on the air pump loading equipment to adjust the pressure of the air pump and simulate the air using state of the whole vehicle;
the third step: and judging the respective durability of the air conditioner compressor, the power steering pump, the generator and the air pump before and after the test and in the test process.
In the second step, a =3B + C.
The third step is that:
for the air conditioner compressor, if abnormal sound does not occur in the test process, the system pressure is not abnormal, the refrigerator is not leaked, after the test, the wear rates of the electromagnetic clutch, the compressor and the expansion valve are all in the required range, the belt wheel of the compressor has no crack, and the coil of the electromagnetic clutch of the compressor is not burnt out, so that the durability of the compressor is judged to meet the requirement;
for the power steering pump, if the system pressure is not abnormal or leaked in the test process, after the test, the meshing surface of the flow control valve and the valve seat is well sealed, the wear rate and the spring elasticity of the safety valve are within the required range, the cavity wall of the vane pump is not worn or pulled, and the vane of the vane pump is not worn, the durability of the vane pump is judged to meet the requirement;
for the generator, if the stator insulation, the excitation winding and the rectifier diode are not short-circuited in the test process, after the test, the brush wear rate, the rotor deformation rate and the bearing wear rate are all in the required ranges, and the belt pulley is crack-free, the durability of the belt pulley is judged to meet the requirement;
for the air pump, if the belt pulley has no crack, no noise and no leakage in the test process, the durability of the air pump is judged to meet the requirement.
In the second step, the total time of the endurance tests of the air conditioner compressor, the generator, the power steering pump and the air pump is 400-600 hours.
In the first step, the generator is connected with the generator load loading equipment through a whole vehicle storage battery.
In the second step, before the endurance test of the air conditioner compressor is carried out, the whole vehicle air conditioner system is required to be installed on the rack.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a durability test method for a front-end wheel train accessory of an engine, which comprises the steps of respectively configuring corresponding load loading equipment for an air conditioner compressor, a generator, a power steering pump and an air pump on the engine, then the air-conditioning compressor, the generator, the power steering pump and the air pump are subjected to a circulating full-load deloading test under the working conditions that the engine is in an idling state and the ambient temperature is 60-70 ℃, finally the respective durability is judged according to the performances of the air-conditioning compressor, the power steering pump, the generator and the air pump before and after the test and in the test process, the method realizes the simultaneous verification of the durability of the air conditioner compressor, the power steering pump, the generator and the air pump in the same test environment by simulating the harsh running environment of the engine gear train accessories to the maximum extent, is quick, effectively saves the development verification time and cost, and has accurate assessment results. Therefore, the method of the invention is fast and accurate.
Drawings
FIG. 1 is a system block diagram of the present invention.
Fig. 2 is a schematic view of the cyclic loading and unloading of the air conditioner compressor of the present invention.
Fig. 3 is a schematic view of the cyclic load and unload of the power steering pump according to the present invention.
Fig. 4 is a schematic view of the cyclic load and load reduction of the generator according to the present invention.
In the figure, an engine 1, an air-conditioning compressor 2, a power-assisted steering pump 3, a generator 4, an air pump 5, an air-conditioning compressor load loading device 6, a power-assisted steering pump load loading device 7, a generator load loading device 8, an air pump loading device 9 and a whole vehicle battery jar 10.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
A durability test method for an engine front end wheel train accessory sequentially comprises the following steps:
the first step is as follows: referring to fig. 1, an engine 1 is mounted on a rack and is respectively connected with an air conditioner compressor 2 and an air conditioner compressor load loading device 6 on the engine 1, a power steering pump 3 and a power steering pump load loading device 7 on the engine 1, a generator 4 and a generator load loading device 8 on the engine 1, and an air pump 5 and an air pump load loading device 9 on the engine 1;
the second step is that: the endurance test of the air-conditioning compressor, the generator, the power steering pump and the air pump is carried out under the working conditions that the engine 1 is in an idle state and the ambient temperature is 60-70 ℃, wherein,
the endurance test of the air conditioner compressor is as follows: firstly, starting the air conditioner compressor load loading equipment 6 to load the air conditioner compressor 2 to the maximum load for A seconds, then closing the air conditioner compressor load loading equipment 6 for A seconds, then starting the air conditioner compressor load loading equipment 6 to load the air conditioner compressor 2 to the maximum load for A seconds, and sequentially circulating until the endurance test is finished, wherein the circulation schematic diagram is shown in FIG. 2;
the endurance test of the power steering pump is as follows: starting the power steering pump load loading device 7 to load the power steering pump 3 to the maximum load for B seconds, then closing the power steering pump load loading device 7 for C seconds, then starting the power steering pump load loading device 7 to load the power steering pump 3 to the maximum load for B seconds, and sequentially circulating until the endurance test is finished, wherein the circulation schematic diagram of the power steering pump load loading device is shown in FIG. 3;
the durability test of the generator refers to: the generator load loading device 8 loads the generator 4 to the maximum load current thereof for D hours, then unloads the generator to the small load loading current of X amperes for E hours, then loads the generator to the maximum load current thereof for D hours, and sequentially circulates until the endurance test is finished, and the circulation schematic diagram thereof is shown in fig. 4;
the endurance test of the air pump refers to: adjusting the opening of a deflation valve installed on the air pump loading equipment 9 to adjust the pressure of the air pump 5, and simulating the air using state of the whole vehicle;
the third step: and judging the durability of the air conditioner compressor 2, the power steering pump 3, the generator 4 and the air pump 5 according to the performances before and after the test and in the test process.
In the second step, a =3B + C.
The third step is that:
for the air conditioner compressor 2, if abnormal sound does not occur in the test process, the system pressure is not abnormal, the refrigerator is not leaked, after the test, the wear rates of the electromagnetic clutch, the compressor and the expansion valve are all in the required range, the belt wheel of the compressor has no crack, and the coil of the electromagnetic clutch of the compressor is not burnt out, the durability of the compressor is judged to meet the requirement;
for the power steering pump 3, if the system pressure is not abnormal or leaked in the test process, after the test, the meshing surface of the flow control valve and the valve seat is well sealed, the wear rate and the spring elasticity of the safety valve are within the required range, the cavity wall of the vane pump is not worn or pulled, and the vane of the vane pump is not worn, the durability of the vane pump is judged to meet the requirement;
for the generator 4, if the stator insulation, the excitation winding and the rectifier diode are not short-circuited in the test process, after the test, the brush wear rate, the rotor deformation rate and the bearing wear rate are all in the required ranges, and the belt pulley is crack-free, the durability of the belt pulley is judged to meet the requirement;
for the air pump 5, if the belt pulley has no crack, no noise and no leakage in the test process, the durability is judged to meet the requirement.
In the second step, the total time of the endurance tests of the air conditioner compressor, the generator, the power steering pump and the air pump is 400-600 hours.
In the first step, the generator 4 is connected with the generator load loading device 8 through the whole vehicle battery 10.
In the second step, before the endurance test of the air conditioner compressor is carried out, the whole vehicle air conditioner system is required to be installed on the rack.
The principle of the invention is illustrated as follows:
the invention provides a durability test method for a front-end wheel train accessory of an engine, which simulates a high-temperature state in an engine cabin and a severe operating condition under the condition of a finished automobile operating state and controls an air conditioner compressor, a generator and a power steering pump to carry out circulating load and unload increase and decrease until the test is finished. Wherein, the A, B, C, D, E value is determined by an engine design development target, and the total time of the endurance test is determined according to the engine design development target and the proportion of the idle running time of the engine in the design mileage of the engine.
In the invention, the determination method of the test environment temperature comprises the following steps: the vehicle runs under the maximum load under the condition of full load on a rotating hub of the whole vehicle, and the whole vehicle returns to idle speed after the temperature around a gear train is stable; and actually measuring the temperature around the wheel train accessory in the whole process, taking the highest temperature obtained by detection as the test environment temperature, and adopting the hot air blower blowing wheel train accessory on the engine rack to reach the test environment temperature.
Before the endurance test is performed, the engine 1 should select a train belt tensioner with minimum tension, a train belt with the longest length, and a torsional damper with the minimum rigidity.
Example 1:
referring to fig. 1-4, a durability test method for an engine front end wheel train accessory is sequentially carried out according to the following steps:
the first step is as follows: referring to fig. 1, an engine 1 and a finished automobile air conditioning system are installed on a rack, an air conditioner compressor 2 on the engine 1 is connected with an air conditioner compressor load loading device 6, a power steering pump 3 on the engine 1 is connected with a power steering pump load loading device 7, a generator 4 on the engine 1 is connected with a generator load loading device 8 through a finished automobile storage battery 10, and an air pump 5 on the engine 1 is connected with an air pump loading device 9;
the second step is that: an endurance test is carried out on the engine 1 in an idling state under the working condition that the ambient temperature is 60-70 ℃ and the total time of the air-conditioning compressor, the generator, the power steering pump and the air pump is 500 hours, wherein,
the endurance test of the air conditioner compressor is as follows: referring to fig. 2, the air conditioner compressor load loading device 6 is started first to load the air conditioner compressor 2 to the maximum load for a second, then the air conditioner compressor load loading device 6 is closed for a second, then the air conditioner compressor load loading device 6 is started to load the air conditioner compressor 2 to the maximum load for a second, and the operation is sequentially circulated until the endurance test is finished;
the endurance test of the power steering pump is as follows: referring to fig. 3, the power steering pump load loading device 7 is started first to load the power steering pump 3 to the maximum load for B seconds, then the power steering pump load loading device 7 is closed for C seconds, then the power steering pump load loading device 7 is started to load the power steering pump 3 to the maximum load for B seconds, and the operation is sequentially cycled until the endurance test is finished;
the durability test of the generator refers to: referring to fig. 4, the generator load loading device 8 loads the generator 4 to its maximum load current for D hours, then unloads to a small load loading current of X amperes for E hours, then loads to its maximum load current for D hours, and sequentially cycles until the endurance test is finished;
the endurance test of the air pump refers to: adjusting the opening of a deflation valve installed on the air pump loading equipment 9 to adjust the pressure of the air pump 5, and simulating the air using state of the whole vehicle;
and a =3B + C;
the third step: the durability of the air-conditioning compressor 2, the power steering pump 3, the generator 4 and the air pump 5 is judged according to the performances before and after the test and in the test process, and the method specifically comprises the following steps:
for the air conditioner compressor 2, if abnormal sound does not occur in the test process, the system pressure is not abnormal, the refrigerator is not leaked, after the test, the wear rates of the electromagnetic clutch, the compressor and the expansion valve are all in the required range, the belt wheel of the compressor has no crack, and the coil of the electromagnetic clutch of the compressor is not burnt out, the durability of the compressor is judged to meet the requirement;
for the power steering pump 3, if the system pressure is not abnormal or leaked in the test process, after the test, the meshing surface of the flow control valve and the valve seat is well sealed, the wear rate and the spring elasticity of the safety valve are within the required range, the cavity wall of the vane pump is not worn or pulled, and the vane of the vane pump is not worn, the durability of the vane pump is judged to meet the requirement;
for the generator 4, if the stator insulation, the excitation winding and the rectifier diode are not short-circuited in the test process, after the test, the brush wear rate, the rotor deformation rate and the bearing wear rate are all in the required ranges, and the belt pulley is crack-free, the durability of the belt pulley is judged to meet the requirement;
for the air pump 5, if the belt pulley has no crack, no noise and no leakage in the test process, the durability is judged to meet the requirement.
Claims (6)
1. A durability test method for an engine front end wheel train accessory is characterized by comprising the following steps:
the method comprises the following steps in sequence:
the first step is as follows: the method comprises the following steps that an engine (1) is installed on a rack and is respectively connected with an air conditioner compressor (2) and an air conditioner compressor load loading device (6) on the engine (1), a power steering pump (3) and a power steering pump load loading device (7) on the engine (1), a generator (4) and a generator load loading device (8) on the engine (1), and an air pump (5) and an air pump loading device (9) on the engine (1);
the second step is that: the endurance test of the air conditioner compressor, the generator, the power steering pump and the air pump is carried out under the working conditions that the engine (1) is in an idle state and the ambient temperature is 60-70 ℃, wherein,
the endurance test of the air conditioner compressor is as follows: firstly, starting the air conditioner compressor load loading equipment (6) to load the air conditioner compressor (2) to the maximum load for A seconds, then closing the air conditioner compressor load loading equipment (6) for A seconds, then starting the air conditioner compressor load loading equipment (6) to load the air conditioner compressor (2) to the maximum load for A seconds, and sequentially circulating until the endurance test is finished;
the endurance test of the power steering pump is as follows: starting a power-assisted steering pump load loading device (7) to load the power-assisted steering pump (3) to the maximum load for B seconds, then closing the power-assisted steering pump load loading device (7) for C seconds, then starting the power-assisted steering pump load loading device (7) to load the power-assisted steering pump (3) to the maximum load for B seconds, and sequentially circulating until the endurance test is finished;
the durability test of the generator refers to: the generator load loading equipment (8) loads the generator (4) to the maximum load current for D hours, then carries the generator to the small load loading current of X amperes for E hours, then loads the generator to the maximum load current for D hours, and sequentially circulates until the endurance test is finished;
the endurance test of the air pump refers to: adjusting the opening degree of an air discharge valve arranged on the air pump loading equipment (9) to adjust the pressure of the air pump (5) and simulate the air using state of the whole vehicle;
the third step: and judging the durability of the air conditioner compressor (2), the power steering pump (3), the generator (4) and the air pump (5) according to the performances before and after the test and in the test process.
2. The durability test method for the engine front end wheel train attachment according to claim 1, characterized in that:
in the second step, a ═ 3B + C.
3. The durability test method for the engine front end wheel train attachment according to claim 1, characterized in that:
the third step is that:
for the air conditioner compressor (2), if abnormal sound does not occur in the test process, the system pressure is not abnormal, the refrigerator is not leaked, after the test, the wear rates of the electromagnetic clutch, the compressor and the expansion valve are all in the required range, the belt wheel of the compressor has no crack, and the coil of the electromagnetic clutch of the compressor is not burnt out, the durability of the compressor is judged to meet the requirement;
for the power-assisted steering pump (3), if the system pressure is not abnormal or leaked in the test process, after the test, the meshing surface of the flow control valve and the valve seat is well sealed, the wear rate and the spring elasticity of the safety valve are within the required range, the cavity wall of the vane pump is not worn or pulled, and the vane of the vane pump is not worn, the durability of the vane pump is judged to meet the requirement;
for the generator (4), if the stator insulation, the excitation winding and the rectifier diode are not short-circuited in the test process, after the test, the brush wear rate, the rotor deformation rate and the bearing wear rate are all in the required ranges, and the belt pulley is crack-free, the durability of the belt pulley is judged to meet the requirement;
and for the air pump (5), if the belt pulley has no crack, no noise and no leakage in the test process, judging that the durability of the belt pulley meets the requirement.
4. The durability test method for the engine front end wheel train attachment according to claim 1, characterized in that: in the second step, the total time of the endurance tests of the air conditioner compressor, the generator, the power steering pump and the air pump is 400-600 hours.
5. The durability test method for the engine front end wheel train attachment according to claim 1, characterized in that: in the first step, the generator (4) is connected with a generator load loading device (8) through a whole vehicle battery (10).
6. The durability test method for the engine front end wheel train attachment according to claim 1, characterized in that: in the second step, before the endurance test of the air conditioner compressor is carried out, the whole vehicle air conditioner system is required to be installed on the rack.
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