CN102023087B - Performance test evaluation method of flow-limiting valve of common-rail fuel system - Google Patents
Performance test evaluation method of flow-limiting valve of common-rail fuel system Download PDFInfo
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- CN102023087B CN102023087B CN200910057905A CN200910057905A CN102023087B CN 102023087 B CN102023087 B CN 102023087B CN 200910057905 A CN200910057905 A CN 200910057905A CN 200910057905 A CN200910057905 A CN 200910057905A CN 102023087 B CN102023087 B CN 102023087B
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Abstract
The invention discloses a performance test evaluation method of a flow-limiting valve of a common-rail fuel system, comprising the following steps of: setting fuel common-rail pressure by adopting an electronic control system, and setting the flow rate of fuel flowing through the flow-limiting valve; and detecting the flow-limiting performance of the flow-limiting valve by measuring the off time and the fuel injection state of the flow-limiting valve under the set fuel common-rail pressure and the set flow rate. The invention has easy implementation and strong generality and can directly carry out the performance test on the flow-limiting valve of the common-rail fuel system of an engine, and a test result can comprehensively and directly reflect the characteristics of the self performance of the flow-limiting valve; and in addition, the invention can detect the flow-limiting performance of the flow-limiting valve under continuous flow rate and single flow rate, thereby more comprehensively evaluating the performance of the flow-limiting valve.
Description
Technical field
The present invention relates to a kind of test method of common rail fuel combustion system, be specifically related to a kind of performance test appraisal procedure of common rail fuel combustion system flow-limiting valve.
Background technology
Great technical progress, particularly common rail fuel combustion system that the application of electronic control technology on engine fuel injection system is regarded as engine are acknowledged as current state-of-the-art fuel injection system.In order to test the flow-limiting valve performance of common rail fuel combustion system; Whether generally test the single traffic-limiting feature of judging flow-limiting valve through the system integration meets the demands; Concrete grammar is to adopt test unit as shown in Figure 1; High-pressure oil pump 3, high-pressure oil pipe 15, fuel common-rail 12, flow-limiting valve 11, electric-controlled fuel injector 13 are formed the complete common rail system of a cover, drive operation by testing table drive system 1.In the process of the test, through the fuel pressure in the electronic control system 18 control fuel common-rails 12, and the injection frequency of electric-controlled fuel injector 13 and pulsewidth, observe the spray regime (normal injection or stop to spray) of electric-controlled fuel injector 13.In the time of in fuel pressure, injection frequency, injection pulse width are set in the normal range of operation that a whole set of common rail system uses, flow-limiting valve 11 can guarantee electric-controlled fuel injector 13 normal injection; When above-mentioned setup parameter exceeded range of operation, flow-limiting valve 11 can make electric-controlled fuel injector 13 stop to spray, and thought that then tested flow-limiting valve 11 can satisfy the requirement of the normal operation of common rail system.
This method judges through a complete set of common rail fuel combustion system test bay ground connection whether the single traffic-limiting feature of flow-limiting valve 11 satisfies request for utilization; Can not analyze the performance of flow-limiting valve 11 self on the one hand through testing directly; Comprehensive inadequately to the assessment of flow-limiting valve performance on the other hand, the traffic-limiting feature under continuous low discharge (like little continuous release) situation does not obtain embodying yet.This method test the time be subject to the influence of the electric-controlled fuel injector of installing 13 expulsion pressures and injection frequency, pulsewidth limit value; And; The electric-controlled fuel injector 13 that tested flow-limiting valve 11 needs to be equipped with the common rail system that matches with it makes an experiment to judge whether its systemic-function satisfies application requirements, so this method does not have versatility.
Summary of the invention
Technical matters to be solved by this invention provides a kind of performance test appraisal procedure of common rail fuel combustion system flow-limiting valve; Its special performance to flow-limiting valve in the common rail fuel combustion system makes an experiment and assesses, and can also directly reflect the performance characteristics of flow-limiting valve self comprehensively.
For solving the problems of the technologies described above, the technical solution of the performance test appraisal procedure of common rail fuel combustion system flow-limiting valve of the present invention is:
Adopt electronic control system to set the pressure of fuel common-rail, and set the fuel flow of the flow-limiting valve of flowing through, setting the current limiting performance that rail pressure and shut-in time and the fuel injection state set under the flow measure flow-limiting valve through measuring flow-limiting valve.
Adopt following method to detect the current limiting performance of flow-limiting valve under continuous flow:
The first step, prepare: close the measuring switch solenoid valve, drive the testing table drive system, make high-pressure oil pump pass through high-pressure oil pipe to the fuel common-rail fuel feeding, the high pressure fuel of certain pressure flows to throttling valve from fuel common-rail through flow-limiting valve;
In second step, set rail pressure: regulate electronic control system, make the pressure of fuel common-rail reach setting value and be in steady state (SS);
The 3rd step; Setting is through the flow of flow-limiting valve: the aperture of regulating the throttling valve of connecting with flow-limiting valve; The rail pressure set of the aperture of throttling valve and said second step determined jointly the to flow through fuel flow of throttling valve, this flow is the fuel flow of the flow-limiting valve of under set pressure, flowing through;
The 4th step; Measure: open the measuring switch solenoid valve; Pick up counting simultaneously; When flow-limiting valve is closed, finish timing, institute is flow-limiting valve the survey time and is setting rail pressure and the shut-in time of setting under the flow, and the rail pressure of setting, the flow of setting and corresponding shut-in time have been reflected the current limiting performance of tested flow-limiting valve under this continuous flow jointly.
Adopt following method to detect the current limiting performance of flow-limiting valve under the single flow:
The first step, prepare: drive the testing table drive system, make high-pressure oil pump pass through high-pressure oil pipe to the fuel common-rail fuel feeding, the high pressure fuel of certain pressure flows to fuel injector from fuel common-rail through flow-limiting valve;
In second step, set rail pressure: regulate electronic control system, make the pressure of fuel common-rail reach setting value and be in steady state (SS);
The 3rd goes on foot, and sets the single flow of the flow-limiting valve of flowing through: set the injection frequency of fuel injector, the adjustment injection pulse width makes fuel injector carry out fuel injection with the single distributive value of setting;
In the 4th step, measure: the test fuel injector obtains the current limiting performance of flow-limiting valve under the single flow at the spray regime of setting under rail pressure, injection frequency and the single distributive value.
The technique effect that the present invention can reach is:
The present invention is easy to realize, highly versatile; The present invention can directly make a service test to the flow-limiting valve of engine common rail fuel combustion system; Its test findings can directly reflect the characteristics of flow-limiting valve self performance comprehensively; The present invention can detect the current limiting performance of flow-limiting valve under continuous flow and single flow, and is more comprehensive to the assessment of its performance.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the test unit of prior art common rail fuel combustion system;
Fig. 2 is the test unit that the present invention is used to detect the current limiting performance of flow-limiting valve under continuous flow;
Fig. 3 is the test unit that the present invention is used to detect the current limiting performance of flow-limiting valve under the single flow;
Fig. 4 is the process flow diagram of the performance test appraisal procedure of common rail fuel combustion system flow-limiting valve of the present invention.
Description of reference numerals among the figure:
1 is the testing table drive system, and 2 is the testing table chassis, and 3 is high-pressure oil pump,
4 is pump inlet pipe, and 5 is the oil pump scavenge pipe, and 8 is fuel tank,
9 is the oil spilling scavenge pipe, and 10 is support, and 11 is flow-limiting valve,
12 is fuel common-rail, and 13 is electric-controlled fuel injector, and 14 are the fog dispersal device,
15 is high-pressure oil pipe, and 16 is high-pressure oil pump fuel-flow control solenoid valve,
18 is electronic control system, and 22 is the measuring switch solenoid valve,
21 is throttling valve, and 23 is flowmeter, and 31 is electric-controlled fuel injector,
32 are the fog dispersal device, and 33 is flowmeter.
Embodiment
As shown in Figure 4; The performance test appraisal procedure of common rail fuel combustion system flow-limiting valve of the present invention; Adopt electronic control system to set the pressure of fuel common-rail 12; And set the fuel flow of the flow-limiting valve 11 of flowing through, setting the current limiting performance that rail pressure and shut-in time and the fuel injection state set under the flow measure flow-limiting valve 11 through measuring flow-limiting valve 11.
The performance test appraisal procedure of common rail fuel combustion system flow-limiting valve of the present invention can detect flow-limiting valve performance aspect two under continuous flow and under the single flow respectively, with the performance of comprehensive assessment flow-limiting valve.
Detect the current limiting performance of common rail fuel combustion system flow-limiting valve under continuous flow and adopt test unit as shown in Figure 2, test unit comprises high-pressure oil pump 3, fuel common-rail 12, fuel tank 8; High-pressure oil pump 3 connects fuel common-rail 12 through high-pressure oil pipe 15, and high-pressure oil pump 3 is communicated with fuel tank 8 through pump inlet pipe 4, oil pump scavenge pipe 5; High-pressure oil pump 3 drives through testing table drive system 1, and testing table drive system 1 is provided with electronic control system 18; High-pressure oil pump 3 is provided with high-pressure oil pump fuel-flow control solenoid valve 16.Through the adjusting of 18 pairs of high-pressure oil pump fuel-flow controls of electronic control system solenoid valve 16, can be under specific pressure with the pressure control of fuel common-rail 12.
Fuel common-rail 12 is communicated with fuel tank 8 through oil spilling scavenge pipe 9, is in series with flow-limiting valve 11, throttling valve 21, measuring switch solenoid valve 22 on the oil spilling scavenge pipe 9.The flow of throttling valve 21 can be regulated through aperture.
Fuel common-rail 12 is arranged on the support 10, and testing table drive system 1, high-pressure oil pump 3, support 10, fuel tank 8 are arranged on the testing table chassis 2.
The method for testing performance of flow-limiting valve under continuous flow is following:
1, close measuring switch solenoid valve 22, drive testing table drive system 1, make high-pressure oil pump 3 pass through high-pressure oil pipe 15 to fuel common-rail 12 fuel feeding, the high pressure fuel of certain pressure flows to throttling valve 21 from fuel common-rail 12 through flow-limiting valve 11;
2, set rail pressure; Regulate electronic control system 18, make the pressure of fuel common-rail 12 reach setting value and be in steady state (SS);
3, set the flow that passes through flow-limiting valve 11;
Regulate the aperture of the throttling valve 21 connect with flow-limiting valve 11, the rail pressure of the aperture of throttling valve 21 and setting before determined jointly the to flow through fuel flow (this flow value can record at the flowmeter 23 of on oil spilling scavenge pipe 9, connecting under the situation of not adorning flow-limiting valve 11 in advance) of throttling valve 21; The fuel flow of this flow that is the flow-limiting valve 11 of under set pressure, flowing through;
4, open measuring switch solenoid valve 22, pick up counting simultaneously, when flow-limiting valve 11 is closed, finish timing, institute is flow-limiting valve 11 the survey time and is setting rail pressure and the shut-in time of setting under the flow.The rail pressure of setting, the flow of setting and corresponding shut-in time have been reflected the current limiting performance of tested flow-limiting valve under this continuous flow jointly.
Change the setup parameter of rail pressure and flow, revision test can obtain the battery of tests result, can obtain the current limiting performance of flow-limiting valve 11 under continuous flow.
Detect the current limiting performance of common rail fuel combustion system flow-limiting valve under the single flow and adopt test unit as shown in Figure 3, test unit comprises high-pressure oil pump 3, fuel common-rail 12, fuel tank 8; Fuel common-rail 12 is communicated with fuel tank 8 through oil spilling scavenge pipe 9, is in series with flow-limiting valve 11, electric-controlled fuel injector 31, fog dispersal device 32 on the oil spilling scavenge pipe 9.The injection frequency and the pulsewidth of electric-controlled fuel injector 31 are adjustable.Electric-controlled fuel injector 31 adopts big products, as the part of test unit, can cover the flow range of flow-limiting valve 11 to be tested, can be divided into 2～3 grades according to the specification of subjects.
The method for testing performance of flow-limiting valve under the single flow is following:
1, drive testing table drive system 1, make high-pressure oil pump 3 pass through high-pressure oil pipe 15 to fuel common-rail 12 fuel feeding, the high pressure fuel of certain pressure flows to electric-controlled fuel injector 31 from fuel common-rail 12 through flow-limiting valve 11;
2, set rail pressure; Regulate electronic control system 18, make the pressure of fuel common-rail 12 reach setting value and be in steady state (SS);
3, set the single flow of the flow-limiting valve 11 of flowing through;
Set the injection frequency of electric-controlled fuel injector 31; The adjustment injection pulse width; Make electric-controlled fuel injector 31 carry out fuel injection with the single distributive value set (this single distributive value can be recorded at the flowmeter 23 of on oil spilling scavenge pipe 9, connecting under the situation of not adorning flow-limiting valve 11 by electric-controlled fuel injector 31 self specification and injection pulse width decision in advance);
4, electric-controlled fuel injector 31 carries out fuel injection under the situation of above-mentioned setting common rail pressure, injection frequency, injection pulse width; Through the sufficiently long time; Whether observe flow-limiting valve 11 can close; Close and explain that then 11 pairs of these electric-controlled fuel injectors 31 of this flow-limiting valve can play metering function at setpoint frequency and setting single flow, vice versa.Test findings has reflected tested flow-limiting valve 11 acting single flow maximal values and the corresponding normal frequency range of moving of system, thereby has reflected its current limiting performance under this single flow.
Through changing injection frequency and pulsewidth; Revision test; Measure the frequency and the single oil mass scope of flow-limiting valve 11 operate as normal to be measured through the On/Off state that detects flow-limiting valve 11, thereby obtain the current limiting performance of flow-limiting valve 11 under the single flow and the frequency range of system's operate as normal.
Claims (2)
1. the performance test appraisal procedure of a common rail fuel combustion system flow-limiting valve; It is characterized in that: adopt the performance test apparatus of common rail fuel combustion system flow-limiting valve to detect the current limiting performance of flow-limiting valve under continuous flow, said performance test apparatus comprises high-pressure oil pump, fuel common-rail, fuel tank; High-pressure oil pump connects fuel common-rail through high-pressure oil pipe, and high-pressure oil pump is communicated with fuel tank through pump inlet pipe, oil pump scavenge pipe; High-pressure oil pump is through the testing table drive systems, and the testing table drive system is provided with electronic control system; High-pressure oil pump is provided with high-pressure oil pump fuel-flow control solenoid valve;
May further comprise the steps:
The first step, prepare: close the measuring switch solenoid valve, drive the testing table drive system, make high-pressure oil pump pass through high-pressure oil pipe to the fuel common-rail fuel feeding, the high pressure fuel of certain pressure flows to throttling valve from fuel common-rail through flow-limiting valve;
In second step, set rail pressure: regulate electronic control system, make the pressure of fuel common-rail reach setting value and be in steady state (SS);
The 3rd step; Setting is through the flow of flow-limiting valve: the aperture of regulating the throttling valve of connecting with flow-limiting valve; The rail pressure set of the aperture of throttling valve and said second step determined jointly the to flow through fuel flow of throttling valve, this flow is the fuel flow of the flow-limiting valve of under set pressure, flowing through;
The 4th step; Measure: open the measuring switch solenoid valve; Pick up counting simultaneously; When flow-limiting valve is closed, finish timing, institute is flow-limiting valve the survey time and is setting rail pressure and the shut-in time of setting under the flow, and the rail pressure of setting, the flow of setting and corresponding shut-in time have been reflected the current limiting performance of tested flow-limiting valve under this continuous flow jointly.
2. the performance test appraisal procedure of a common rail fuel combustion system flow-limiting valve; It is characterized in that: adopt the performance test apparatus of common rail fuel combustion system flow-limiting valve to detect the current limiting performance of flow-limiting valve under the single flow, said performance test apparatus comprises high-pressure oil pump, fuel common-rail, fuel tank; Fuel common-rail is communicated with fuel tank through the oil spilling scavenge pipe, is in series with flow-limiting valve, electric-controlled fuel injector, fog dispersal device on the oil spilling scavenge pipe;
May further comprise the steps:
The first step, prepare: drive the testing table drive system, make high-pressure oil pump pass through high-pressure oil pipe to the fuel common-rail fuel feeding, the high pressure fuel of certain pressure flows to fuel injector from fuel common-rail through flow-limiting valve;
In second step, set rail pressure: regulate electronic control system, make the pressure of fuel common-rail reach setting value and be in steady state (SS);
The 3rd goes on foot, and sets the single flow of the flow-limiting valve of flowing through: set the injection frequency of fuel injector, the adjustment injection pulse width makes fuel injector carry out fuel injection with the single distributive value of setting;
In the 4th step, measure: the test fuel injector obtains the current limiting performance of flow-limiting valve under the single flow at the spray regime of setting under rail pressure, injection frequency and the single distributive value.
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| CN200910057905A CN102023087B (en) | 2009-09-17 | 2009-09-17 | Performance test evaluation method of flow-limiting valve of common-rail fuel system |
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| CN200910057905A CN102023087B (en) | 2009-09-17 | 2009-09-17 | Performance test evaluation method of flow-limiting valve of common-rail fuel system |
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| CN104088743B (en) * | 2014-06-06 | 2016-10-19 | 潍柴动力股份有限公司 | Electrocontrolled high-pressure oil pump and interface thereof connect anti-detection device and detection method |
| CN108361138B (en) * | 2018-01-29 | 2020-08-25 | 中国第一汽车股份有限公司 | Diagnosis and detection method and device for high-pressure common-rail pipe flow limiting valve |
| CN111175040B (en) * | 2019-12-31 | 2021-06-11 | 中国船舶重工集团公司第七一一研究所 | Method for testing closed oil quantity of flow limiting valve |
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| CN2795470Y (en) * | 2005-01-20 | 2006-07-12 | 武汉理工大学 | Medium voltage common rail electric control system test table for combined mobile diesel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2795470Y (en) * | 2005-01-20 | 2006-07-12 | 武汉理工大学 | Medium voltage common rail electric control system test table for combined mobile diesel engine |
Non-Patent Citations (1)
| Title |
|---|
| 张静秋等.高压共轨系统限流器的研究.《武汉理工大学学报(交通科学与工程版)》.2008,第32卷(第3期),第508页右栏，表1-2. * |
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