CN112196786B - Test method for checking mechanical vacuum pump carried on automobile engine - Google Patents
Test method for checking mechanical vacuum pump carried on automobile engine Download PDFInfo
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- CN112196786B CN112196786B CN202011057110.3A CN202011057110A CN112196786B CN 112196786 B CN112196786 B CN 112196786B CN 202011057110 A CN202011057110 A CN 202011057110A CN 112196786 B CN112196786 B CN 112196786B
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- engine
- vacuum pump
- brake
- whole vehicle
- vacuum
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Classifications
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
- B60T13/565—Vacuum systems indirect, i.e. vacuum booster units characterised by being associated with master cylinders, e.g. integrally formed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Engines (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
A test method for checking that an automobile engine carries a mechanical vacuum pump belongs to the technical field of engine test and test. The working condition design of the test bed is carried out by referring to the actual condition of the whole vehicle in the advancing process; the controller outputs a pedal signal, controls the opening of an engine accelerator, simulates the whole vehicle to step on the accelerator pedal, and controls the rotating speed of the dynamometer through the frequency converter; connecting gas pipelines of a vacuum pump, a vacuum tank and a brake booster of an engine in series, and acquiring the pressure change of each pipeline node in real time; simulating the brake state of the whole vehicle to carry out bench simulation design; the bench control program controls the operation of the engine and the hardware to simulate the braking action, so that a data curve of pressure change of each pipeline node corresponding to each operation condition of the engine is obtained, the cycle times are set in the bench control program, the vacuum source generated by the vacuum pump is continuously braked and consumed in a simulation limit state, and the working capacity of the vacuum pump is further analyzed. The invention is used for simulation examination of the brake boosting vacuum provided by the engine carrying vacuum pump for the whole vehicle.
Description
Technical Field
The invention belongs to the technical field of engine test and test, and particularly relates to a test method for checking a mechanical vacuum pump carried on an automobile engine.
Background
In recent years, with the increasingly worsening of the environment in the world and the gradual tightening of emission regulations, most entire factories carrying diesel engines are gradually changed into gasoline engines capable of better meeting the emission regulations under the current background, and the gasoline engines are particularly important to various research and development.
Most of the brake boosting of passenger vehicles in the current market are realized by adopting an air inlet manifold or an electronic brake booster pump. For the reason that the air inlet manifold is used for providing brake assistance for the engine, the brake assistance capacity provided by the air inlet manifold is limited, the engine works under the conditions of heavy load and high rotating speed, the action amplitude of the flap of the throttle valve is large, and the stable negative pressure source cannot be provided for the whole vehicle in time under the condition of partial uphill heavy load and vehicle following. The electronic brake booster pump has high cost, short service life, more wear caused by no lubrication of the pump body and obvious failure rate.
Disclosure of Invention
The invention aims to provide a test method for checking a mechanical vacuum pump mounted on an automobile engine, aiming at the problem that no checking method for the mechanical vacuum pump mounted on the automobile engine exists at present.
In view of the fact that various development works of the gasoline engine tend to be meticulous and accurate at present, and a test method which is more perfect and accurate in performance index assessment of parts carried by the engine is needed, the test method for assessing the mechanical vacuum pump carried by the automobile engine provided by the invention perfectly solves the performance index assessment of the mechanical vacuum pump carried by the engine and provides data support for the next development of the engine.
According to the test result, the negative pressure generated by the mechanical vacuum pump is equal to that of the electronic brake booster pump, but the failure rate of the mechanical vacuum pump is far lower than that of the electronic brake booster pump, the provided brake booster vacuum is stable and reliable, and no electronic failure occurs.
In order to achieve the purpose, the invention adopts the technical scheme that:
a test method for examining a mechanical vacuum pump carried by an automobile engine comprises the following steps:
the method comprises the following steps: and (3) referring to the urban working condition of the whole vehicle in the advancing process to design the working condition of the test bed: the controller controls the engine to loosen an accelerator and brake at the same time at 2000rpm/40Nm according to the urban working condition, the speed per hour of the whole vehicle is simulated to be reduced to a parking state at 60KM/h, a vacuum source generated by a vacuum pump of the engine is consumed for 4s, then the engine is lifted to 2000rpm/40Nm, the speed of the whole vehicle is simulated to be increased to 60KM/h for 8s from the parking state, working condition parameters of the engine controlled by the controller are calculated and set according to the heavy load of the whole vehicle and the climbing working condition, and the working condition is set to be the urban working condition at present;
step two: the controller outputs a pedal signal to control the opening of an engine throttle, simulates the whole vehicle to step on the throttle pedal, controls the rotating speed of the dynamometer through the frequency converter, enables the engine to rise from an idle speed to 2000rpm, then falls from 2000rpn to the idle speed change working condition, and controls the reversing time of the reversing valve;
step three: connecting gas pipelines of an engine vacuum pump, a vacuum tank and a brake booster in series, respectively arranging pressure sensors at an outlet of the engine vacuum pump, an outlet of the vacuum tank and an inlet of the brake booster, and acquiring pressure change of each pipeline node in real time;
step four: the simulation of the whole vehicle brake state is designed by a rack simulation: under the whole vehicle state, a brake pedal pushes a brake booster, the whole vehicle brake working condition is simulated on a test bed, compressed air is connected to a five-position four-way reversing valve, the reversing valve is connected with a cylinder, the cylinder is connected with the brake booster, a platform control system is used for controlling the position of the reversing valve to reverse the compressed air, the cylinder connected with the reversing valve is further controlled to extend out or retract, the brake booster connected with the cylinder completes the simulation of whole vehicle stepping-down brake or brake releasing action under the telescopic working condition of the cylinder, and a vacuum source generated by an engine vacuum pump consumes vacuum under the brake condition of the brake booster;
step five: the controller controls the operation of the engine and hardware to simulate braking action, so that a data curve of pressure change of each pipeline node corresponding to each operation condition of the engine is obtained, cycle times are set in a rack control program, a vacuum source generated by a vacuum pump is continuously braked and consumed in a simulation limit state, and the working capacity of the vacuum pump is further analyzed;
if all actions of braking, brake keeping and brake releasing are completed within 12s, 500 cycles are continuously performed, the negative pressure generated by the vacuum pump of the engine in each cycle is consumed by 3%, but the negative pressure is supplemented within 2s, the requirement that the whole vehicle consumes vacuum in a limit state and recovers the original negative pressure value within 5s is met, the repeatability of the negative pressure change trend of the inlet of the brake booster is not more than 0.5%, and the brake booster is qualified, otherwise, the brake booster is not qualified; and the deviation between the data measured after the 450h endurance test of the engine and the test data before the endurance test is not more than 2%, and the current vacuum pump is qualified in examination, otherwise, the vacuum pump is unqualified.
Compared with the prior art, the invention has the beneficial effects that: the invention takes an engine carrying a mechanical vacuum pump as a research object, adopts a rack to simulate the whole vehicle to simulate the braking working condition, a controller controls the rotating speed of the engine, the opening degree of an accelerator and a reversing valve, indirectly controls the expansion of a cylinder through reversing, pushes a brake booster when the cylinder extends out, simulates the whole vehicle to step on a brake pedal to brake, consumes the brake boosting vacuum generated by the vacuum pump, pulls the brake booster when the cylinder retracts into the original position, and simulates the whole vehicle to loosen the brake pedal. The invention can carry out simulation examination of the brake boosting vacuum provided by the mechanical vacuum pump carried by the engine for the whole vehicle, and the measured data provides powerful support for the development of the engine. According to the test result, the continuous actions of braking, brake keeping and brake releasing are completed within 12s, 500 cycles are continuously carried out, the negative pressure generated by the vacuum pump of the engine in each cycle is consumed by 3%, but the negative pressure is timely supplemented within 2s, the requirements that the whole vehicle consumes vacuum in a limit state and recovers the original negative pressure value within 5s are met, the repeatability of the negative pressure change trend of the inlet of the brake booster is 0.5%, the deviation of the test data after the endurance of 450h and the data before the endurance of 450h is 2%, and all the data meet the design index.
Detailed Description
The first embodiment is as follows: the embodiment discloses a test method for checking a mechanical vacuum pump carried on an automobile engine, which comprises the following steps:
the method comprises the following steps: and (3) referring to the urban working condition of the whole vehicle in the advancing process to design the working condition of the test bed: the controller controls the engine to loosen an accelerator and brake at the same time at 2000rpm/40Nm according to the urban working condition, the speed per hour of the whole vehicle is simulated to be reduced to a parking state at 60KM/h, a vacuum source generated by a vacuum pump of the engine is consumed for 4s, then the engine is lifted to 2000rpm/40Nm, the speed of the whole vehicle is simulated to be increased to 60KM/h for 8s from the parking state, working condition parameters of the engine controlled by the controller are calculated and set according to the heavy load of the whole vehicle and the climbing working condition, and the working condition is set to be the urban working condition at present;
step two: the controller outputs a pedal signal to control the opening of an engine throttle, simulates the whole vehicle to step on the throttle pedal, controls the rotating speed of the dynamometer through the frequency converter, enables the engine to rise from an idle speed to 2000rpm, then falls from 2000rpn to the idle speed change working condition, and controls the reversing time of the reversing valve;
step three: connecting gas pipelines of an engine vacuum pump, a vacuum tank and a brake booster in series, respectively arranging pressure sensors at an outlet of the engine vacuum pump, an outlet of the vacuum tank and an inlet of the brake booster, and acquiring pressure changes of nodes of the pipelines (namely the outlet of the engine vacuum pump, the outlet of the vacuum tank and the inlet of the brake booster) in real time;
step four: simulating the whole vehicle brake state to carry out rack simulation design: under the whole vehicle state, a brake pedal pushes a brake booster, the whole vehicle brake working condition is simulated on a test bench, compressed air is connected to a five-position four-way reversing valve, the reversing valve is connected with a cylinder, the cylinder is connected with the brake booster, the position of the reversing valve is controlled by a bench control system to carry out compressed air reversing, the cylinder connected with the reversing valve is further controlled to extend out or retract, the brake booster connected with the cylinder completes the simulation of whole vehicle stepping on the brake or the release of the brake action under the telescopic working condition of the cylinder, and a vacuum source generated by an engine vacuum pump consumes vacuum under the brake condition of the brake booster;
step five: the controller controls the operation of the engine and hardware (the hardware refers to an air cylinder and a brake booster) to simulate the brake action, so that a data curve of pressure change of each pipeline node corresponding to each operation condition of the engine is obtained, the cycle times are set in a rack control program, the vacuum source generated by the vacuum pump is continuously braked and consumed in a simulation limit state, and the working capacity of the vacuum pump is further analyzed;
if all actions of braking, brake keeping and brake releasing are completed within 12s, 500 cycles are continuously carried out, the negative pressure generated by the vacuum pump of the engine in each cycle is consumed by 3%, but the negative pressure is supplemented within 2s, the requirement that the whole vehicle consumes the vacuum in the limit state and recovers the original negative pressure value within 5s is met, the repeatability of the negative pressure change trend of the inlet of the brake booster is not more than 0.5%, and the brake booster is qualified, otherwise, the brake booster is unqualified; and the deviation between the measured data after the 450h endurance test of the engine and the test data before the endurance test is not more than 2%, and the current vacuum pump is qualified, otherwise, the vacuum pump is unqualified.
Claims (1)
1. A test method for checking an automobile engine carrying mechanical vacuum pump is characterized by comprising the following steps: the test method comprises the following steps:
the method comprises the following steps: and (3) referring to the urban working condition of the whole vehicle in the advancing process to design the working condition of the test bed: the controller controls the engine to loosen an accelerator and brake at the same time when the engine is at 2000rpm/40Nm according to urban working conditions, the speed of the whole vehicle is simulated to be reduced to a parking state at 60KM/h, a vacuum source generated by an engine vacuum pump is consumed for 4s, then the engine is lifted to 2000rpm/40Nm, the whole vehicle is simulated to be increased to 60KM/h from the parking state for 8s, working condition parameters of the engine controlled by the controller are calculated and set according to the heavy load of the whole vehicle and climbing working conditions, and the working conditions are currently set as urban working conditions;
step two: the controller outputs a pedal signal to control the opening of an engine throttle, simulates the whole vehicle to step on the throttle pedal, controls the rotating speed of the dynamometer through the frequency converter, enables the engine to rise from an idle speed to 2000rpm, then falls from 2000rpn to the idle speed change working condition, and controls the reversing time of the reversing valve;
step three: connecting gas pipelines of an engine vacuum pump, a vacuum tank and a brake booster in series, respectively arranging pressure sensors at an outlet of the engine vacuum pump, an outlet of the vacuum tank and an inlet of the brake booster, and acquiring pressure change of each pipeline node in real time;
step four: the simulation of the whole vehicle brake state is designed by a rack simulation: under the whole vehicle state, a brake pedal pushes a brake booster, the whole vehicle brake working condition is simulated on a test bench, compressed air is connected to a five-position four-way reversing valve, the reversing valve is connected with a cylinder, the cylinder is connected with the brake booster, the position of the reversing valve is controlled by a bench control system to carry out compressed air reversing, the cylinder connected with the reversing valve is further controlled to extend out or retract, the brake booster connected with the cylinder completes the simulation of whole vehicle stepping on the brake or the release of the brake action under the telescopic working condition of the cylinder, and a vacuum source generated by an engine vacuum pump consumes vacuum under the brake condition of the brake booster;
step five: the controller controls the operation of the engine and hardware to simulate braking action, so that a data curve of pressure change of each pipeline node corresponding to each operation condition of the engine is obtained, cycle times are set in a rack control program, a vacuum source generated by a vacuum pump is continuously braked and consumed in a simulation limit state, and the working capacity of the vacuum pump is further analyzed;
if all actions of braking, brake keeping and brake releasing are completed within 12s, 500 cycles are continuously performed, the negative pressure generated by the vacuum pump of the engine in each cycle is consumed by 3%, but the negative pressure is supplemented within 2s, the requirement that the whole vehicle consumes vacuum in a limit state and recovers the original negative pressure value within 5s is met, the repeatability of the negative pressure change trend of the inlet of the brake booster is not more than 0.5%, and the brake booster is qualified, otherwise, the brake booster is not qualified; and the deviation between the data measured after the 450h endurance test of the engine and the test data before the endurance test is not more than 2%, and the current vacuum pump is qualified in examination, otherwise, the vacuum pump is unqualified.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011057110.3A CN112196786B (en) | 2020-09-29 | 2020-09-29 | Test method for checking mechanical vacuum pump carried on automobile engine |
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| CN202011057110.3A CN112196786B (en) | 2020-09-29 | 2020-09-29 | Test method for checking mechanical vacuum pump carried on automobile engine |
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| CN112196786A CN112196786A (en) | 2021-01-08 |
| CN112196786B true CN112196786B (en) | 2022-09-30 |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6955406B2 (en) * | 2004-02-18 | 2005-10-18 | Bludot, Inc. | Altitude compensating trailer brake system |
| CN201096575Y (en) * | 2007-07-24 | 2008-08-06 | 比亚迪股份有限公司 | Durability test device for vacuum booster with master cylinder assembly |
| CN101767581B (en) * | 2008-12-30 | 2013-08-28 | 比亚迪股份有限公司 | Vacuum assisted brake system, control method thereof, and vehicle comprising vacuum assisted brake system |
| CN103253255B (en) * | 2012-12-31 | 2016-03-30 | 湖南吉利汽车部件有限公司 | A kind of attached vacuum booster brake device |
| CN104502116B (en) * | 2014-09-18 | 2017-10-17 | 浙江万向精工有限公司 | Hydraulic analog test device and its system and method for testing |
| CN205665012U (en) * | 2016-06-13 | 2016-10-26 | 北京福田康明斯发动机有限公司 | A test device for having engine of vacuum pump |
| CN210834176U (en) * | 2019-09-06 | 2020-06-23 | 深圳臻宇新能源动力科技有限公司 | Loading test system for engine bench test |
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