CN202031712U - Equipment and system used for controlling common rail system injection pressure - Google Patents
Equipment and system used for controlling common rail system injection pressure Download PDFInfo
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- CN202031712U CN202031712U CN2011200048093U CN201120004809U CN202031712U CN 202031712 U CN202031712 U CN 202031712U CN 2011200048093 U CN2011200048093 U CN 2011200048093U CN 201120004809 U CN201120004809 U CN 201120004809U CN 202031712 U CN202031712 U CN 202031712U
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- metering valve
- fuel metering
- equipment
- common rail
- rail system
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Abstract
The mode of execution of the utility model discloses equipment and system used for controlling common rail system injection pressure, wherein the equipment includes an estimating device and a determining device; the estimating device is used for estimating the current resistance value of the fuel metering valve of the common rail system; the determining device is connected with the estimating device and used for determining the modified voltage exerted on the fuel metering valve based on the current resistance value. The equipment and system can improve the control precision on the fuel metering valve without the need of the current feedback of the fuel metering valve, so as to realize the high-precision control on the common rail system injection pressure.
Description
Technical field
The utility model relates to Diesel Engine Technique Field, more specifically, relates to the equipment and the system that are used to control the common rail system injection pressure.
Background technique
The diesel engine fuel injecting technology has experienced traditional mechanical handling formula oil spout and modern these two developing stage of electrically controlled manipulation formula oil spout.At present, the realization means of electronic control injection technology mainly contain pump nozzle, monoblock pump and common rail system etc.Pump nozzle and monoblock pump all are based on fuel cam, the pulsation fuel feeding, but the characteristic of fuel delivery of the two all is subjected to the influence of cam profile and cam rotating speed.Common rail system can be realized good control owing to wide accommodation and to fuel injection quantity, thereby becomes electronic control injection implementation comparatively commonly used.
Existing common rail system mainly adopts the rail pressure feedback to carry out PID (proportional-integral-differential) control of fuel flow for the control of injection pressure.The PID control of adopting currrent feedback to carry out the fuel metering valve opening is a kind of technological means commonly used, this is by utilizing the relation of pressure and flow, flow and aperture, aperture and electric current, electric current and dutycycle, determine the aperture of fuel metering valve, thereby realize accurate control rail pressure.
Yet, the resistance characteristic of fuel metering valve may change with the variation of environmental factor, operating conditions or cumulative time, if therefore fuel metering valve continues to carry out work based on the duty cycle signals of setting according to former resistance value, then the electric current by fuel metering valve must be different from predetermined current value, thereby the aperture of fuel metering valve can't reach pre-provisioning request.Thus, the reliability of common rail system significantly reduces, and the significantly increase of controlling cost.
The model utility content
At above problem, the utility model provides a kind of equipment and system that is used to control the common rail system injection pressure.
According to first aspect of the present utility model, a kind of equipment that is used to control the common rail system injection pressure is provided, described equipment can comprise: estimation unit is arranged to the current resistance value of the fuel metering valve of estimating described common rail system; And definite device, be connected with described estimation unit, be arranged to the correction voltage value of determining to be applied to described fuel metering valve based on described current resistance value.
According to an embodiment of the present utility model, described estimation unit can comprise: acquisition module is arranged to the running parameter that obtains described fuel metering valve; Estimation block is connected with described acquisition module, is arranged to utilize described running parameter to estimate the current resistance value of described fuel metering valve.
According to an embodiment of the present utility model, described running parameter can comprise in following one or multinomial: the initial resistivity value of described fuel metering valve, temperature coefficient of resistance, resistance coefficient of heat transfer, resistive qualities, resistance ratio thermal capacitance, inductance constant, current magnitude of voltage, working hour and the medium temperature of applying.
According to an embodiment of the present utility model, described definite device can comprise: receiving module is arranged to and receives the predetermined current value that is used for described fuel metering valve; Computing module is connected with described estimation unit and described receiving module, is arranged to according to described current resistance value and described predetermined current value, and calculating will be applied to the correction voltage value of described fuel metering valve.
According to an embodiment of the present utility model, described equipment can also comprise: signal forms device, is connected with described definite device, is arranged to according to described correction voltage value and forms duty cycle signals.
According to second aspect of the present utility model, a kind of common rail system is provided, this common rail system can comprise the equipment that is used to control the common rail system injection pressure according to first aspect of the present utility model.
The resistance correction value adjustment that is used to control the equipment utilization fuel metering valve of common rail system injection pressure of the present utility model will put on the duty cycle signals of fuel metering valve, thereby feasible electric current and scheduled current by fuel metering valve is consistent, improved control accuracy, realized High Accuracy Control thus the common rail system injection pressure to fuel metering valve.In addition, can significantly reduce cost, effectively improve system reliability according to common rail system of the present utility model.
By the description of following preferred implementation to explanation the utility model principle, and in conjunction with the accompanying drawings, other features of the present utility model and advantage will be conspicuous.
Description of drawings
By below in conjunction with the description of the drawings, and along with understanding more comprehensively to of the present utility model, other purposes of the present utility model and effect will become clear more and easy to understand.
Fig. 1 is the schematic representation of an exemplary common rail system.
Fig. 2 is the illustrative diagram of the characteristic of fuel delivery of fuel metering valve.
Fig. 3 is the skeleton diagram of equipment that is used to control the common rail system injection pressure according to an embodiment of the present utility model.
Fig. 4 is the flow chart of method that is used to control the common rail system injection pressure according to an embodiment of the present utility model.
In all above-mentioned accompanying drawings, identical label represents to have identical, similar or corresponding feature or function.
Embodiment
Below in conjunction with accompanying drawing the utility model is explained in more detail and illustrated.Should be appreciated that drawings and Examples of the present utility model only are used for exemplary effect, be not to be used to limit protection domain of the present utility model.
Fig. 1 is the schematic representation of an exemplary common rail system 100.
Common rail system 100 shown in Figure 1 is a kind of Electrocontrolled high-pressure common rail systems." automatically controlled " is meant that injection system controlled by processor, processor is accurately controlled constantly to fuel injection quantity, the oil spout of each oil nozzle, can make the fuel economy and the power character of diesel engine reach best balance, traditional diesel engine then is that control accuracy can't be ensured by machinery control; " high pressure " is meant that injection system pressure ratio conventional diesel is confidential and exceeds 1.1 times, and high energy reaches 145MPa (and the conventional diesel engine injection pressure is at 60-70MPa), the big sufficient combustion that atomized of pressure, thus improved power character, finally reach fuel-efficient purpose; " rail altogether " is to supply with each oil nozzle simultaneously by common feeder line, fuel injection quantity calculates through ECU (electric control unit) is accurate, the fuel oil of same quality, same pressure is provided to each oil nozzle simultaneously, makes engine running more smooth-going, thereby optimize the diesel engine combination property.
Below introduce the groundwork flow process of common rail system 100.At first, fuel oil arrives the high-pressure service pump 104 with fuel metering valve 103 by fuel tank 101 through filter 102, the fuel metering valve 103 of fuel oil by being in certain aperture then, and be stored in a certain pressure and prepare in the common rail pipe 106 to spray, calculate injection starting point, injection duration and jet pressure by ECU 105, trigger solenoid valve then and make the oil sprayer 107 of cylinder carry out respective spray.
Fuel metering valve 103 is vitals of common rail for diesel engine system 100, and it can be a kind of proportional electromagnetic valve, for example IMV valve, EFC/MEUN valve, SCV valve or PCV valve etc.The realization purpose of fuel metering valve 103 is oil inlet quantity and oil return flows of control high-pressure service pump 104, thereby the control fuel feed pump plunger is to the fuel delivery of common rail pipe 106, satisfy the predetermined rail pressure of common rail system, form closed loop control with rail pressure sensor (not shown), reduce the power consumpiton of motor and the unnecessary compression of fuel oil rail pressure.
Fuel metering valve 103 generally is subjected to ECU 105 controls.Under ECU 105 cold situations, fuel metering valve 103 is closed.In ECU 105 energising but under the situation that motor is not activated, fuel metering valve 103 standard-sized sheets.Behind ECU 105 energisings and engine start, determine the aperture of fuel metering valve 103 according to rail pressure and oil mass demand, this moment, the aperture of fuel metering valve 103 can be determined in the following manner: at first calculate the poor of predetermined rail pressure in the high pressure oil rail 104 and current rail pressure; Calculate current required fuel delivery according to this difference and current fuel injection quantity size; The ECU 105 required fuel delivery that will calculate is transformed into electrical signal then, and this electrical signal for example is the duty cycle signals with predetermined voltage, is used for making that the electric current by fuel metering valve 103 reaches predetermined current value; At last, determine the aperture of fuel metering valve 103, thereby drive this fuel metering valve 103 actions according to this electrical signal.
Fig. 2 shows the characteristic of fuel delivery of fuel metering valve 103.From Fig. 2 as seen, big more by the electric current of fuel metering valve, represent that required oil mass is more little, this moment, the aperture of fuel metering valve 103 then should correspondingly reduce; Electric current by fuel metering valve is more little, represents that required oil mass is big more, and this moment, the aperture of fuel metering valve 103 then should correspondingly increase.
Therefore, the aperture of fuel metering valve 103 is subjected to the control by the electric current of fuel metering valve.Yet the resistance characteristic of resistance may change with the variation of environmental factor, operating conditions or cumulative time.For example, when temperature raise, the resistance of resistance increased, and then the electric current by resistance reduces under the constant situation of ohmically voltage putting on; When temperature reduced, the resistance of resistance reduced, and then the electric current by resistance increases under the constant situation of voltage.In actual applications, under influences such as environmental factor, operating conditions or cumulative time, when the duty cycle signals that will have predetermined voltage is applied to fuel metering valve, electric current and predetermined current value by fuel metering valve may produce deviation, cause the aperture of fuel metering valve not reach pre-provisioning request.
The equipment that is used to control the common rail system injection pressure of the present utility model has been considered influences such as environmental factor, operating conditions or cumulative time, the magnitude of voltage that promptly will be applied to the electrical signal of fuel metering valve is revised, thereby feasible electric current and predetermined current value by fuel metering valve is consistent, and realizes the more accurate control to the aperture of fuel metering valve.
Fig. 3 is the skeleton diagram of equipment 300 that is used to control the common rail system injection pressure according to an embodiment of the present utility model.
The equipment 300 that is used to control the common rail system injection pressure comprises: estimation unit 310 and definite device 320.Estimation unit 310 is used to estimate the current resistance value of the fuel metering valve of common rail system, and estimation unit 310 can comprise acquisition module 311 and estimation block 312.Determine that device 320 is used for determining that based on the definite correction voltage value that will be applied to fuel metering valve of current resistance value device 320 can comprise receiving module 321 and computing module 322.
Estimation block 312 is used to utilize running parameter to estimate the current resistance value of fuel metering valve.Wherein, running parameter can for example be initial resistivity value, temperature coefficient of resistance, resistance coefficient of heat transfer, resistive qualities, resistance ratio thermal capacitance, inductance constant, current magnitude of voltage, working hour and the medium temperature of applying of fuel metering valve.
Receiving module 321 is used to receive the predetermined current value that is used for fuel metering valve.
In addition, the equipment 300 that is used to control the common rail system injection pressure of the present utility model can also comprise that signal forms the device (not shown), this signal forms device and is used for forming duty cycle signals according to described correction voltage value, for example can obtain duty cycle signals divided by 24 volts by the correction voltage value that will be applied to fuel metering valve that computing module 322 is calculated.
Fig. 4 is the flow chart of method that is used to control the common rail system injection pressure according to an embodiment of the present utility model.This method can be controlled equipment 300 execution of common rail system injection pressure by shown in Figure 3 being used to.At first, estimation unit 310 can be estimated the current resistance value of the fuel metering valve of common rail system, will describe the estimation procedure of estimation unit 310 for current resistance value in step 401 and step 402 in detail; Then, determine that device 320 can determine to be applied to the correction voltage value of fuel metering valve based on current resistance value, will in step 403 and step 404, describe the definite process of definite device 320 for correction voltage value.
In step 401, obtain the running parameter of fuel metering valve.
The acquisition module 311 of estimation unit 310 can execution in step 401, obtains the running parameter of fuel metering valve.In the utility model, the running parameter of fuel metering valve for example can be in the following various parameter one or multinomial: the initial resistivity value of fuel metering valve, temperature coefficient of resistance, resistance coefficient of heat transfer, resistive qualities, resistance ratio thermal capacitance, inductance constant, current magnitude of voltage, working hour and the medium temperature of applying.For example, acquisition module 311 can obtain initial resistivity value, temperature coefficient of resistance, resistance coefficient of heat transfer, resistive qualities, resistance ratio thermal capacitance, inductance constant of fuel metering valve etc. from the storage of storing various device parameters in advance.For example, acquisition module 311 can obtain the current magnitude of voltage that is applied to fuel metering valve from ECU.For example, acquisition module 311 clock or timer internally obtains working hour of the fuel metering valve that will be used to calculate, such as zero-time and the concluding time of this working hour.For example, acquisition module 311 can obtain medium temperature from the data from temperature transducer, also can wait and obtain medium temperature, can also utilize to well known to a person skilled in the art that the prior art means obtain medium temperature according to system's accumulated operating time, working condition.
In the present embodiment, suppose that the running parameter that acquisition module 311 obtained is as follows: R
0Be temperature T
0Initial resistivity value in the time of=25 ℃, a
2Be temperature coefficient of resistance, a
3Be the resistance coefficient of heat transfer, m is the quality of resistance, c
pBe the specific heat capacity of resistance, T
jBe the temperature of medium, L is the inductance constant, U
1Be the current effective voltage value that is applied to fuel metering valve, t
0Be the zero-time of working hour, t
1It is the concluding time.Wherein, medium for example can be a diesel oil.
In step 402, utilize running parameter to estimate the current resistance value of fuel metering valve.
The estimation block 312 of estimation unit 310 can execution in step 402, utilizes the current resistance value of running parameter estimation fuel metering valve.
At first, estimation block 312 is with the current resistance value R of fuel metering valve
1Equivalence is initial resistivity value R
0With the series connection of an inductance L, then can obtain following equation:
R
1＝R
0+ΔTa
2 (1)
Can obtain according to equation (1), (2), (3), (4):
Wherein:
Therefore, according to formula (5), estimation block 312 can calculate the current resistance value R of oil meter metered valve
1
In step 403, receive the predetermined current value that is used for fuel metering valve.
The receiving module 321 of determining device 320 can execution in step 403, receives the predetermined current value that is used for fuel metering valve.
Predetermined current value is corresponding with the fuel metering valve opening that common rail system is wished.Common rail system according to the oil mass shown in Figure 2 and the relation of electric current, can obtain a current value according to setting the amount of fuel that rail pressure and actual measurement rail pressure can calculate the needs injection, is called predetermined current value at this.Receiving module 321 can obtain predetermined current value from ECU, also can obtain this current value from any suitable storage of storing this predetermined current value.
When maintenance was consistent with predetermined current value by the current value of fuel metering valve, the aperture of fuel metering valve can reach the result of hope, thereby realized accurately control.
In step 404, according to current resistance value and predetermined current value, calculating will be applied to the correction voltage value of fuel metering valve.
The computing module 322 of determining device 320 can execution in step 404, comes will be applied to according to current resistance value and predetermined current value calculating the correction voltage value of fuel metering valve.
In this step, at first, computing module 322 can receive the current resistance value of fuel metering valve from estimation block 312, and can receive the predetermined current value that is used for fuel metering valve from receiving module 321; Then, computing module 322 can with from the current resistance value of estimation module 312 with multiply each other from the predetermined current value of receiving module 321, thereby calculate the correction voltage value that will be applied to fuel metering valve.This correction voltage value is the effective voltage value at fuel metering valve.
In addition, in the utility model, " duty cycle signals " refers to that a pulse sequence (for example, square wave), the endurance of positive pulse and this pulse interval have certain ratio relation in one of them pulse interval.According to the correction voltage value that will be applied to fuel metering valve that the computing module 322 of determining device 320 calculates, the signal of equipment 300 forms the device (not shown) can obtain duty cycle signals.For example signal form device can by with this correction voltage value divided by 24 volts, obtain duty cycle signals.
The utility model also provides a kind of common rail system, and this common rail system can also comprise the equipment that is used to control the common rail system injection pressure according to of the present utility model on the basis of common rail system shown in Figure 1 100, equipment 300 for example shown in Figure 3.
The resistance correction value adjustment that is used to control the equipment utilization fuel metering valve of common rail system injection pressure of the present utility model will put on the duty cycle signals of fuel metering valve, thereby feasible electric current and scheduled current by fuel metering valve is consistent, improved control accuracy, realized High Accuracy Control thus the common rail system injection pressure to fuel metering valve.In addition, can significantly reduce cost, effectively improve system reliability according to common rail system of the present utility model.
The equipment that is used for controlling the common rail system injection pressure of the present utility model can be realized at the ECU of common rail system, also can in the hardware component that can control fuel metering valve, realize, can also in any suitable hardware component that it may occur to persons skilled in the art that, realize.
Equipment disclosed in the utility model can be realized in the combination of software, hardware or software and hardware.Hardware components can utilize special logic to realize; Software section can be stored in the storage, and by suitable instruction execution system, for example microprocessor, personal computer (PC) or large scale computer are carried out.
Should be noted that for the utility model is more readily understood top description has been omitted to be known for a person skilled in the art and may to be essential some ins and outs more specifically for realization of the present utility model.
The purpose that specification of the present utility model is provided is in order to illustrate and to describe, rather than is used for exhaustive or the utility model is restricted to disclosed form.For those of ordinary skill in the art, many modifications and changes all are conspicuous.
Therefore; selecting and describing mode of execution is in order to explain principle of the present utility model and practical application thereof better; and those of ordinary skills are understood; under the prerequisite that does not break away from the utility model essence, all modifications and change all fall within the protection domain of the present utility model defined by the claims.
Claims (6)
1. an equipment that is used to control the common rail system injection pressure is characterized in that, described equipment comprises:
Estimation unit is arranged to the current resistance value of the fuel metering valve of estimating described common rail system; And
Determine device, be connected, be arranged to the correction voltage value of determining to be applied to described fuel metering valve based on described current resistance value with described estimation unit.
2. according to the equipment of claim 1, it is characterized in that described estimation unit comprises:
Acquisition module is arranged to the running parameter that obtains described fuel metering valve;
Estimation block is connected with described acquisition module, is arranged to utilize described running parameter to estimate the current resistance value of described fuel metering valve.
3. according to the equipment of claim 2, it is characterized in that described running parameter comprises in following one or multinomial: the initial resistivity value of described fuel metering valve, temperature coefficient of resistance, resistance coefficient of heat transfer, resistive qualities, resistance ratio thermal capacitance, inductance constant, current magnitude of voltage, working hour and the medium temperature of applying.
4. according to the equipment of claim 1, it is characterized in that described definite device comprises:
Receiving module is arranged to and receives the predetermined current value that is used for described fuel metering valve;
Computing module is connected with described estimation unit and described receiving module, is arranged to according to described current resistance value and described predetermined current value, and calculating will be applied to the correction voltage value of described fuel metering valve.
5. according to the equipment of claim 4, it is characterized in that described equipment also comprises:
Signal forms device, is connected with described definite device, is arranged to according to described correction voltage value and forms duty cycle signals.
6. a common rail system is characterized in that, described system comprises:
According to each described equipment that is used to control the common rail system injection pressure among the claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200048093U CN202031712U (en) | 2011-01-04 | 2011-01-04 | Equipment and system used for controlling common rail system injection pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200048093U CN202031712U (en) | 2011-01-04 | 2011-01-04 | Equipment and system used for controlling common rail system injection pressure |
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| CN202031712U true CN202031712U (en) | 2011-11-09 |
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| CN2011200048093U Expired - Fee Related CN202031712U (en) | 2011-01-04 | 2011-01-04 | Equipment and system used for controlling common rail system injection pressure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135044A (en) * | 2011-01-04 | 2011-07-27 | 潍柴动力股份有限公司 | Method, device and system used for controlling oil injection pressure of common rail system |
| CN110427713A (en) * | 2019-08-07 | 2019-11-08 | 中国北方发动机研究所(天津) | A kind of matching process of engine high-pressure pump |
-
2011
- 2011-01-04 CN CN2011200048093U patent/CN202031712U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135044A (en) * | 2011-01-04 | 2011-07-27 | 潍柴动力股份有限公司 | Method, device and system used for controlling oil injection pressure of common rail system |
| CN102135044B (en) * | 2011-01-04 | 2013-08-14 | 潍柴动力股份有限公司 | Method, device and system used for controlling oil injection pressure of common rail system |
| CN110427713A (en) * | 2019-08-07 | 2019-11-08 | 中国北方发动机研究所(天津) | A kind of matching process of engine high-pressure pump |
| CN110427713B (en) * | 2019-08-07 | 2023-04-07 | 中国北方发动机研究所(天津) | Matching method of high-pressure pump for engine |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20190104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |