CN109100138B - Method for evaluating reliability of clutch in finished automobile state - Google Patents
Method for evaluating reliability of clutch in finished automobile state Download PDFInfo
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- CN109100138B CN109100138B CN201810811682.2A CN201810811682A CN109100138B CN 109100138 B CN109100138 B CN 109100138B CN 201810811682 A CN201810811682 A CN 201810811682A CN 109100138 B CN109100138 B CN 109100138B
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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
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/022—Power-transmitting couplings or clutches
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention relates to a method for evaluating the reliability of a clutch in a whole vehicle state, which can objectively and truly evaluate the reliability of the clutch when a user uses a vehicle and solve the problem that the evaluation conclusion of the reliability of the clutch is inconsistent under two working conditions of professional test and actual use of the user. The method comprises the following steps: firstly, preparing a vehicle; secondly, testing a clutch working point; thirdly, the clutch is in running-in; fourthly, testing the clutch; fifthly, processing data; and sixthly, evaluating the performance of the clutch.
Description
Technical Field
The invention relates to an automobile power transmission system, in particular to a method for evaluating the reliability of a clutch in a finished automobile state.
Background
The clutch has the function of transmitting and cutting off the power output of the engine. When the manual-gear vehicle starts, a user often uses a half clutch to ensure that the power output of an engine is soft and meet the requirement of the user on the starting comfort of the vehicle. At present, under the increasingly severe current situation of road traffic jam, a user is forced to frequently use a half clutch for starting in a short time, so that the working temperature of the clutch is rapidly increased, and the faults that the clutch slips and a vehicle cannot run occur in severe cases; when the clutch is operated improperly, the clutch is permanently disabled. Meanwhile, the high temperature causes the clutch to generate pungent burning burnt smell, seriously affects the physical and mental health of drivers, and causes great complaints and complaints of users.
The existing clutch reliability evaluation method focuses more on the reliability of the clutch of a vehicle in a professional test field, a correct operation method and a long-mileage smooth driving state, and only focuses on the functional reliability of the clutch, but does not focus on the comfort requirement of a user on smell. Therefore, the existing method cannot evaluate the actual reliability of the clutch of the user in the vehicle using state. With the improvement of the requirements of users on the quality and the driving comfort of the vehicle, it is very important to provide a method for scientifically and objectively evaluating the actual reliability of the clutch in the using state of the vehicle.
CN 102507185a discloses "an evaluation method for realizing the association between subjective and objective data of an automobile clutch". Firstly, establishing a database on a control computer, logging in a user by an operator on the control computer, and setting all information of the experiment; then a driver who carries out the test logs in the system, the driver carries out the separation and combination process test on the automobile clutch according to the system prompt, and the objective detection device records and stores the data of each detection sensor of the clutch; after one test is finished, subjective evaluation and scoring are carried out on the operating performance of the clutch, and then the operating performance is recorded in a database; and finally, after the test of the driver is finished, the operator can check the test curve of the clutch, contrastively analyze the association between the objective detection parameters and the subjective score of the driver, and judge the operation comfort of the clutch. The invention can objectively reflect the operating performance of different clutches, and is convenient for eliminating the influence of different vehicle operating systems during the test of real vehicles.
This is, of course, a beneficial attempt in the art.
Disclosure of Invention
The invention aims to provide a method for evaluating the reliability of a clutch in a whole vehicle state, which can objectively and truly evaluate the reliability of the clutch when a user uses a vehicle and solve the problem that the evaluation conclusion of the reliability of the clutch is inconsistent under two working conditions of professional test and actual use of the user.
The invention relates to a method for evaluating the reliability of a clutch in a finished automobile state, which comprises the following steps:
firstly, preparing a vehicle;
secondly, testing a clutch working point;
2-1, testing and recording the travel of a clutch pedal when the idle speed control is half-clutched to the speed of 5km/h under the working condition of a flat road;
2-2, testing and recording the travel of a clutch pedal under the working condition of a 10% ramp and when the vehicle starts and is half-clutched to the vehicle speed of 5km/h under the idle speed control;
thirdly, the clutch is in running-in; the vehicle is on a horizontal and dry road surface, and the running-in is continuously carried out for 200 times, so that the clutch is in the optimal working state before formal testing;
3-1, running-in operation requirement:
the first-gear and half-clutch idle starting is carried out, the starting time is controlled within 1.5 seconds, the clutch pedal is completely released after the starting is finished, the vehicle is accelerated to 20km/h by using about 5 percent of accelerator opening, the accelerator pedal is released, the engine speed falls back and is stabilized at the driving idle speed, the gear is placed in a neutral position, and the vehicle is stopped in an idle speed;
the running-in is divided into two stages, each stage is divided into 100 times, after each 100 times, the vehicle is cooled, and when the average value of the actually measured temperatures of the three clutch temperature sensors is less than 80 ℃, the cooling operation is finished;
3-2, cooling operation requirements: after the vehicle starts, the vehicle is quickly switched to a third gear, the vehicle runs by using the third gear in an idle speed mode in the whole process, gear shifting and half-clutch are not allowed in the whole process, and the vehicle is decelerated by using a brake pedal when the vehicle needs to be decelerated;
fourthly, testing the clutch;
testing the clutch, and dividing the clutch into a road leveling working condition and a 10% ramp working condition; the specific operation steps are as follows:
4-1, determining the testing starting positions of the flat road working condition and the 10% ramp working condition; the vehicle is stopped at the initial position of the flat road working condition in an idling way, the sensors are confirmed to work normally again, the initial temperature value is recorded, the two-gear external circulation air supply mode is started, and the compressor is ensured to be in a non-working state;
4-2, starting the first-gear idling half-clutch to the vehicle speed of 5km/h under the working condition of a flat road, maintaining the vehicle speed by using the half-clutch, and stopping the vehicle at an idling speed when the vehicle runs to a position 8 meters away from the starting position of the vehicle;
4-3, stepping on the accelerator pedal until the engine speed reaches 1500rpm, keeping the current accelerator pedal stroke, starting the first-gear and half-clutch, keeping the idle speed control half-clutch of the clutch pedal under the working condition of a flat road to the test stroke position when the vehicle speed reaches 5km/h, and stopping the vehicle at the idle speed when the vehicle runs to the position 13 meters away from the starting position of the vehicle; 4-2 to 4-3 are one-time flat road starting;
4-4, continuously repeating four times of flat road starting, and idling and stopping for 20S in situ after completion. Five times of starting on a flat road is a small circulation on the flat road;
4-5, continuously repeating two small circulation of the flat road; the three small circulation of the open road are a large circulation of the open road;
4-6, after the large circulation of the open road is finished, keeping the first gear of the vehicle, driving the vehicle to the initial position below a 10% slope at the speed of not more than 20km/h, and not allowing half-clutch driving in the driving process;
4-7, under the condition of 10% of ramp, parking the vehicle at an idle speed at the initial position below the ramp, adopting a foot brake starting mode, not allowing to use a mechanical or electronic hand brake, starting the engine at 1500rpm, completely releasing an accelerator pedal after starting in a first gear, controlling the vehicle speed to 5km/h by using a half clutch, keeping the current position of the clutch pedal, and parking the vehicle at the idle speed when the vehicle is driven to a position 6 meters away from the initial position of the vehicle;
4-8, stepping on an accelerator pedal until the engine speed is 2500rpm, keeping the current accelerator pedal stroke, starting a first-gear and half-clutch, keeping the clutch pedal under the working condition of a ramp, after starting the vehicle, controlling the idle speed to be half-clutch to the test stroke position when the vehicle speed is 5km/h, and parking the vehicle by using an idle speed foot brake when the vehicle runs to the position 9 meters away from the starting position of the vehicle; the step 4-7 to the step 4-8 is one-time hill starting;
4-9, continuously repeating hill starting twice, and after finishing the hill starting, enabling the vehicle to slide to the initial position below the hill in the neutral gear; starting the slope for three times into a small cycle of the slope;
4-10, repeating two ramps for a small cycle; the three small ramp cycles are one large ramp cycle;
4-11, after the ramp is changed in a large cycle, keeping the first gear of the vehicle, driving the vehicle to the starting position of the flat road working condition at the speed of not more than 20Km/h, and not allowing half clutch driving in the driving process;
4-12, taking a flat road major cycle and a ramp major cycle as an evaluation cycle, continuously finishing five evaluation cycles, and finishing the test;
4-13, recording data of three temperature sensors of the clutch, engine rotating speed data, rotating speed data of an input shaft of the transmission and stroke change conditions of a working point of the clutch in the whole process;
fifthly, processing data;
5-1, recording the number of evaluation cycles of actual completion of the vehicle;
5-2, recording and storing temperature data acquired by the clutch temperature sensor in the whole process;
5-3, recording and storing the clutch burnt odor concentration and the identification complain index under each evaluation cycle;
sixthly, evaluating the performance of the clutch;
recording data of three temperature sensors of the clutch, engine rotating speed data, rotating speed data of an input shaft of the transmission and stroke change conditions of a working point of the clutch according to the whole process; and scoring is carried out according to the cycle number when the clutch ablation burnt odor occurs and the corresponding vehicle burnt odor concentration and the complaining index of the clutch ablation burnt odor concentration.
Further, the first step, vehicle preparation, comprises the steps of:
1-1, replacing a new clutch; a test vehicle is replaced by a new clutch, after the replacement is finished, the hydraulic clutch system needs to fully release air of the hydraulic system, and the mechanical clutch system needs to ensure that the idle stroke of a clutch pedal meets the design requirement;
1-2, installing an engine sensor; an engine speed sensor is fixed on a right box body of the transmission, the central line of the engine speed sensor is vertical to the central line of a starting gear ring on a flywheel gear ring assembly, the distance between the engine speed sensor and the starting gear ring is ensured, and the requirement of a signal acquisition working range of the engine speed sensor is met;
1-3, installing a speed changer input shaft speed sensor, fixing the speed changer input shaft speed sensor on a left box body of a speed changer, directly acquiring the rotating speed of a gear fixedly connected to an input shaft of the speed changer by the speed changer input shaft speed sensor, keeping the center line of the speed changer input shaft speed sensor vertical to the center line of a gear to be measured, ensuring the distance between the input shaft speed sensor and the gear to be measured, and meeting the requirement of the speed changer input shaft speed sensor on signal acquisition working range;
1-4, installing a clutch temperature sensor; three clutch temperature sensors are respectively fixed at the upper, middle and lower positions of a right box body of the transmission, and the three clutch temperature sensors are vertical to the central line of the clutch; on the premise of no interference, the distance between the three clutch temperature sensors and the clutch is less than 5mm so as to ensure that the working temperature of the clutch is acquired more directly;
1-5, connecting a data acquisition system; connecting an engine sensor, a transmission input shaft rotating speed sensor and three clutch temperature sensors with a data acquisition system respectively, connecting the data acquisition system with a test computer, and confirming that each sensor works normally without signal loss;
1-6, vehicle counterweight; and (4) fully loading and balancing the vehicle according to the requirements of the servicing quality and the loads of the front wheel and the rear wheel, which are declared by vehicle regulations.
Compared with the prior art, the invention has the following advantages: firstly, the evaluation method of the invention has more effectiveness than the existing evaluation method, fully considers the road traffic condition actually encountered by the user and the driving proficiency of the operator, and the evaluation conclusion reflects the reliability of the clutch when the user actually uses the vehicle more truly. Secondly, the ablation burnt odor of the clutch which influences the physical and mental health of a user is brought into a clutch reliability evaluation index, a clutch burnt odor concentration complaining index is formulated, and the defect that the existing evaluation method only focuses on functional reliability but not comfort is overcome. Finally, the temperature and rotating speed parameters measured by the method can be used for evaluating whether the design of the clutch is reasonable or not and the tolerance and reliability of other parts in the working space of the clutch to the temperature. The burnt odor concentration score can be used for vehicle sealing and whether the design of the cabin air flow field is reasonable. The change condition of the working point of the clutch can be used for analyzing the performance attenuation of the clutch and optimizing the design. Meanwhile, the application of the invention can obviously reduce the maintenance frequency of the vehicle clutch and the cost of three-pack claims, and improve the satisfaction degree of users.
Drawings
FIG. 1 is a schematic diagram of an engine speed sensor arrangement;
FIG. 2 is a schematic diagram of a transmission input shaft speed sensor arrangement
FIG. 3 is a schematic diagram of an arrangement of three clutch temperature sensors;
fig. 4 is a measured clutch operating point graph.
In the figure: 1-clutch temperature sensor, 2-clutch, 3-transmission right box, 4-flywheel gear ring assembly, 5-starting gear ring, 6-engine speed sensor, 7-transmission input shaft speed sensor, and 8-transmission left box.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
referring to fig. 1 to 4, the present invention includes three parts of test vehicle preparation, clutch 2 running-in, and clutch 2 test, which should be performed sequentially. The clutch 2 test is the core of the evaluation method, and the test vehicle preparation and the clutch 2 running-in are the necessary conditions for the implementation of the clutch test.
The method for evaluating the reliability of the clutch in the state of the whole vehicle comprises the following steps:
firstly, preparing a vehicle;
1-1, replacing a new clutch; the test vehicle is replaced by a new clutch 2, after the replacement is finished, the hydraulic clutch system needs to fully release the air of the hydraulic system, and the mechanical clutch system needs to ensure that the idle stroke of a clutch pedal meets the design requirement;
1-2, installing an engine sensor; referring to fig. 1, an engine speed sensor 6 is fixed on a transmission right box 3, the central line of the engine speed sensor 6 is vertical to the central line of a starting gear ring 5 on a flywheel gear ring assembly 4, and the distance between the engine speed sensor 6 and the starting gear ring 5 is ensured to meet the signal acquisition working range requirement of the engine speed sensor 6;
1-3, installing a transmission input shaft rotating speed sensor, referring to fig. 2, fixing the transmission input shaft rotating speed sensor 7 on a transmission left box body 8, wherein the input shaft rotating speed sensor 7 is used for directly acquiring the rotating speed of a gear fixedly connected to a transmission input shaft, the central line of the input shaft rotating speed sensor 7 is vertical to the central line of a gear to be measured, the distance between the transmission input shaft rotating speed sensor 7 and the gear to be measured is ensured, and the requirement of the transmission input shaft rotating speed sensor 7 on the signal acquisition working range is met;
1-4, installing a clutch temperature sensor; referring to fig. 3, three clutch temperature sensors 1 are respectively fixed at the upper, middle and lower positions of a right box body 3 of the transmission, and the three clutch temperature sensors 1 and the central line of a clutch 2 are vertical; on the premise of no interference, the distance between the three clutch temperature sensors 1 and the clutch 2 is less than 5mm so as to ensure that the working temperature of the clutch 2 is acquired more directly;
1-5, connecting a data acquisition system; an engine sensor 6, a transmission input shaft rotating speed sensor 7 and three clutch temperature sensors 1 are respectively connected with a data acquisition system, and meanwhile, the data acquisition system is connected with a test computer and confirms that each sensor works normally without signal loss;
1-6, vehicle counterweight; according to the requirements of the vehicle regulation on the servicing quality and the loads of front and rear wheels, fully loading and balancing the vehicle;
secondly, testing a clutch working point;
2-1, testing and recording the travel of a clutch pedal when the idle speed control is half-clutched to the speed of 5km/h under the working condition of a flat road;
2-2, testing and recording the travel of a clutch pedal under the working condition of a 10% ramp and when the vehicle starts and is half-clutched to the vehicle speed of 5km/h under the idle speed control;
thirdly, the clutch is in running-in; the vehicle is on a horizontal and dry road surface, and the running-in is continuously carried out for 200 times, so that the clutch 2 is ensured to be in the optimal working state before formal testing;
3-1, running-in operation requirement:
the first-gear and half-clutch idle starting is carried out, the starting time is controlled within 1.5 seconds, the clutch pedal is completely released after the starting is finished, the vehicle is accelerated to 20km/h by using about 5 percent of accelerator opening, the accelerator pedal is released, the engine speed falls back and is stabilized at the driving idle speed, the gear is placed in a neutral position, and the vehicle is stopped in an idle speed;
the running-in is divided into two stages, each stage is divided into 100 times, after each 100 times, the vehicle is cooled, and when the average value of the actually measured temperatures of the three clutch temperature sensors 1 is less than 80 ℃, the cooling operation is finished;
3-2, cooling operation requirements: after the vehicle starts, the vehicle is quickly switched to a third gear, the vehicle runs by using the third gear in an idle speed mode in the whole process, gear shifting and half-clutch are not allowed in the whole process, and the vehicle is decelerated by using a brake pedal when the vehicle needs to be decelerated;
step four, clutch testing:
testing the clutch 2 under two working conditions of a level road working condition and a 10% ramp working condition; the specific operation steps are as follows:
4-1, determining the testing starting positions of the flat road working condition and the 10% ramp working condition; the vehicle is stopped at the initial position of the flat road working condition in an idling way, the sensors are confirmed to work normally again, the initial temperature value is recorded, the two-gear external circulation air supply mode is started, and the compressor is ensured to be in a non-working state;
4-2, starting the first-gear idling half-clutch to the vehicle speed of 5km/h under the working condition of a flat road, maintaining the vehicle speed by using the half-clutch, and stopping the vehicle at an idling speed when the vehicle runs to a position 8 meters away from the starting position of the vehicle;
4-3, stepping on the accelerator pedal until the engine speed reaches 1500rpm, keeping the current accelerator pedal stroke, starting the first-gear and half-clutch, keeping the idle speed control half-clutch of the clutch pedal under the working condition of a flat road to the test stroke position when the vehicle speed reaches 5km/h, and stopping the vehicle at the idle speed when the vehicle runs to the position 13 meters away from the starting position of the vehicle; 4-2 to 4-3 are one-time flat road starting;
4-4, continuously repeating four times of flat road starting, and idling and stopping for 20S in situ after completion. Five times of starting on a flat road is a small circulation on the flat road;
4-5, continuously repeating two small circulation of the flat road; the three small circulation of the open road are a large circulation of the open road;
4-6, after the large circulation of the open road is finished, keeping the first gear of the vehicle, driving the vehicle to the initial position below a 10% slope at the speed of not more than 20km/h, and not allowing half-clutch driving in the driving process;
4-7, under the condition of 10% of ramp, parking the vehicle at an idle speed at the initial position below the ramp, adopting a foot brake starting mode, not allowing to use a mechanical or electronic hand brake, starting the engine at 1500rpm, completely releasing an accelerator pedal after starting in a first gear, controlling the vehicle speed to 5km/h by using a half clutch, keeping the current position of the clutch pedal, and parking the vehicle at the idle speed when the vehicle is driven to a position 6 meters away from the initial position of the vehicle;
4-8, stepping on an accelerator pedal until the engine speed is 2500rpm, keeping the current accelerator pedal stroke, starting a first-gear and half-clutch, keeping the clutch pedal under the working condition of a ramp, after starting the vehicle, controlling the idle speed to be half-clutch to the test stroke position when the vehicle speed is 5km/h, and parking the vehicle by using an idle speed foot brake when the vehicle runs to the position 9 meters away from the starting position of the vehicle; the step 4-7 to the step 4-8 is one-time hill starting;
4-9, continuously repeating hill starting twice, and after finishing the hill starting, enabling the vehicle to slide to the initial position below the hill in the neutral gear; starting the slope for three times into a small cycle of the slope;
4-10, repeating two ramps for a small cycle; 3 small ramp cycles are one large ramp cycle;
4-11, after the ramp is changed in a large cycle, keeping the first gear of the vehicle, driving the vehicle to the starting position of the flat road working condition at the speed of not more than 20Km/h, and not allowing half clutch driving in the driving process;
4-12, taking a flat road major cycle and a ramp major cycle as an evaluation cycle, continuously finishing five evaluation cycles, and finishing the test;
4-13, recording data of three temperature sensors of the clutch, engine rotating speed data, rotating speed data of an input shaft of the transmission and stroke change conditions of a working point of the clutch in the whole process;
in the whole test process, a second-gear external circulation air supply mode is started, and the compressor is not allowed to be started;
in the operation process, the test is terminated when the vehicle cannot be started normally or the rotating speed of the engine is not synchronous with the rotating speed of the input shaft of the transmission after starting.
Fifthly, processing data;
5-1, recording the number of evaluation cycles of actual completion of the vehicle;
5-2, recording and storing the temperature data acquired by the clutch temperature sensor 1 in the whole process;
5-3, recording and storing the burnt smell concentration and the identification complaint index of the clutch 2 under each evaluation cycle;
sixthly, evaluating the performance of the clutch;
recording data of three temperature sensors of the clutch, engine rotating speed data, rotating speed data of an input shaft of the transmission and stroke change conditions of a working point of the clutch according to the whole process; and scoring is carried out according to the cycle number when the clutch ablation burnt odor occurs and the corresponding vehicle burnt odor concentration and the complaining index of the clutch ablation burnt odor concentration.
Claims (2)
1. A method for evaluating the reliability of a clutch in a finished automobile state comprises the following steps:
firstly, preparing a vehicle;
secondly, testing a clutch working point;
2-1, testing and recording the travel of a clutch pedal when the idle speed control is half-clutched to the speed of 5km/h under the working condition of a flat road;
2-2, testing and recording the travel of a clutch pedal under the working condition of a 10% ramp and when the vehicle starts and is half-clutched to the vehicle speed of 5km/h under the idle speed control;
thirdly, the clutch is in running-in; the vehicle is on a horizontal and dry road surface, and the running-in is continuously carried out for 200 times, so that the clutch (2) is ensured to be in the optimal working state before formal testing;
3-1, running-in operation requirement:
the first-gear and half-clutch idle starting is carried out, the starting time is controlled within 1.5 seconds, the clutch pedal is completely released after the starting is finished, the vehicle is accelerated to 20km/h by using about 5 percent of accelerator opening, the accelerator pedal is released, the engine speed falls back and is stabilized at the driving idle speed, the gear is placed in a neutral position, and the vehicle is stopped in an idle speed;
the running-in is divided into two stages, each stage is divided into 100 times, after each 100 times of running-in is finished, the vehicle is cooled, and when the average value of the actually measured temperatures of the three clutch temperature sensors (1) is less than 80 ℃, the cooling operation is finished;
3-2, cooling operation requirements: after the vehicle starts, the vehicle is quickly switched to a third gear, the vehicle runs by using the third gear in an idle speed mode in the whole process, gear shifting and half-clutch are not allowed in the whole process, and the vehicle is decelerated by using a brake pedal when the vehicle needs to be decelerated;
fourthly, testing the clutch;
the clutch (2) is tested and divided into a road leveling working condition and a 10% ramp working condition; the specific operation steps are as follows:
4-1, determining the testing starting positions of the flat road working condition and the 10% ramp working condition; the vehicle is stopped at the initial position of the flat road working condition in an idling way, the sensors are confirmed to work normally again, the initial temperature value is recorded, the two-gear external circulation air supply mode is started, and the compressor is ensured to be in a non-working state;
4-2, starting the first-gear idling half-clutch to the vehicle speed of 5km/h under the working condition of a flat road, maintaining the vehicle speed by using the half-clutch, and stopping the vehicle at an idling speed when the vehicle runs to a position 8 meters away from the starting position of the vehicle;
4-3, stepping on the accelerator pedal until the engine speed reaches 1500rpm, keeping the current accelerator pedal stroke, starting the first-gear and half-clutch, keeping the idle speed control half-clutch of the clutch pedal under the working condition of a flat road to the test stroke position when the vehicle speed reaches 5km/h, and stopping the vehicle at the idle speed when the vehicle runs to the position 13 meters away from the starting position of the vehicle; 4-2 to 4-3 are one-time flat road starting;
4-4, continuously repeating four times of level road starting, idling and stopping for 20S in situ after completion, wherein the five times of level road starting are a level road small cycle;
4-5, continuously repeating two small circulation of the flat road; the three small circulation of the open road are a large circulation of the open road;
4-6, after the large circulation of the open road is finished, keeping the first gear of the vehicle, driving the vehicle to the initial position below a 10% slope at the speed of not more than 20km/h, and not allowing half-clutch driving in the driving process;
4-7, under the condition of 10% of ramp, parking the vehicle at an idle speed at the initial position below the ramp, adopting a foot brake starting mode, not allowing to use a mechanical or electronic hand brake, starting the engine at 1500rpm, completely releasing an accelerator pedal after starting in a first gear, controlling the vehicle speed to 5km/h by using a half clutch, keeping the current position of the clutch pedal, and parking the vehicle at the idle speed when the vehicle is driven to a position 6 meters away from the initial position of the vehicle;
4-8, stepping on an accelerator pedal until the engine speed is 2500rpm, keeping the current accelerator pedal stroke, starting a first-gear and half-clutch, keeping the clutch pedal under the working condition of a ramp, after starting the vehicle, controlling the idle speed to be half-clutch to the test stroke position when the vehicle speed is 5km/h, and parking the vehicle by using an idle speed foot brake when the vehicle runs to the position 9 meters away from the starting position of the vehicle; the step 4-7 to the step 4-8 is one-time hill starting;
4-9, continuously repeating hill starting twice, and after finishing the hill starting, enabling the vehicle to slide to the initial position below the hill in the neutral gear; starting the slope for three times into a small cycle of the slope;
4-10, repeating two ramps for a small cycle; the three small ramp cycles are one large ramp cycle;
4-11, after the ramp is changed in a large cycle, keeping the first gear of the vehicle, driving the vehicle to the starting position of the flat road working condition at the speed of not more than 20Km/h, and not allowing half clutch driving in the driving process;
4-12, taking a flat road major cycle and a ramp major cycle as an evaluation cycle, continuously finishing five evaluation cycles, and finishing the test;
4-13, recording data of three temperature sensors of the clutch, engine rotating speed data, rotating speed data of an input shaft of the transmission and stroke change conditions of a working point of the clutch in the whole process;
fifthly, processing data;
5-1, recording the number of evaluation cycles of actual completion of the vehicle;
5-2, recording and storing temperature data acquired by the clutch temperature sensor (1) in the whole process;
5-3, recording and storing the burnt smell concentration and the identification complaint index of the clutch (2) under each evaluation cycle;
sixthly, evaluating the performance of the clutch;
recording data of three temperature sensors of the clutch, engine rotating speed data, rotating speed data of an input shaft of the transmission and stroke change conditions of a working point of the clutch according to the whole process; and scoring is carried out according to the cycle number when the clutch ablation burnt odor occurs and the corresponding vehicle burnt odor concentration and the complaining index of the clutch ablation burnt odor concentration.
2. The method for evaluating the reliability of the clutch in the state of the whole vehicle according to claim 1, which is characterized in that: the first step, vehicle preparation, comprises the steps of:
1-1, replacing a new clutch; a test vehicle is replaced by a new clutch (2), after the replacement is finished, a hydraulic clutch system needs to fully release air of a hydraulic system, and a mechanical clutch system needs to ensure that the idle stroke of a clutch pedal meets the design requirement;
1-2, installing an engine rotating speed sensor; an engine speed sensor (6) is fixed on a right box body (3) of the transmission, the central line of the engine speed sensor (6) is vertical to the central line of a starting gear ring (5) on a flywheel gear ring assembly (4), the distance between the engine speed sensor (6) and the starting gear ring (5) is ensured, and the requirement of a signal acquisition working range of the engine speed sensor (6) is met;
1-3, installing a transmission input shaft rotating speed sensor, fixing the transmission input shaft rotating speed sensor (7) on a transmission left box body (8), wherein the transmission input shaft rotating speed sensor (7) is required to directly acquire the rotating speed of a gear fixedly connected to a transmission input shaft, the central line of the transmission input shaft rotating speed sensor (7) is required to be vertical to the central line of a gear to be measured, the distance between the transmission input shaft rotating speed sensor (7) and the gear to be measured is ensured, and the requirement of the transmission input shaft rotating speed sensor (7) on the signal acquisition working range is met;
1-4, installing a clutch temperature sensor; three clutch temperature sensors (1) are respectively fixed at the upper, middle and lower positions of a right box body (3) of the transmission, and the three clutch temperature sensors (1) and the central line of a clutch (2) are kept vertical; on the premise of no interference, the distance between the three clutch temperature sensors (1) and the clutch (2) is less than 5mm so as to ensure that the working temperature of the clutch (2) is more directly acquired;
1-5, connecting a data acquisition system; an engine rotating speed sensor (6), a transmission input shaft rotating speed sensor (7) and three clutch temperature sensors (1) are respectively connected with a data acquisition system, and meanwhile, the data acquisition system is connected with a test computer and confirms that all the sensors work normally without signal loss;
1-6, vehicle counterweight; and (4) fully loading and balancing the vehicle according to the requirements of the servicing quality and the loads of the front wheel and the rear wheel, which are declared by vehicle regulations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810811682.2A CN109100138B (en) | 2018-07-23 | 2018-07-23 | Method for evaluating reliability of clutch in finished automobile state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810811682.2A CN109100138B (en) | 2018-07-23 | 2018-07-23 | Method for evaluating reliability of clutch in finished automobile state |
Publications (2)
| Publication Number | Publication Date |
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| CN109100138A CN109100138A (en) | 2018-12-28 |
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| CN113109056B (en) * | 2021-03-01 | 2023-04-25 | 东风汽车集团股份有限公司 | Vehicle accelerator starting power acceleration evaluation method and device |
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