CN102062007B - Rail pressure control method and rail pressure pre-control method and system for engine - Google Patents

Rail pressure control method and rail pressure pre-control method and system for engine Download PDF

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Publication number
CN102062007B
CN102062007B CN2010106017667A CN201010601766A CN102062007B CN 102062007 B CN102062007 B CN 102062007B CN 2010106017667 A CN2010106017667 A CN 2010106017667A CN 201010601766 A CN201010601766 A CN 201010601766A CN 102062007 B CN102062007 B CN 102062007B
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China
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current
value
rail pressure
module
limit
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CN2010106017667A
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Chinese (zh)
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CN102062007A (en
Inventor
佟德辉
孙少军
王秀雷
桑海浪
刘兴义
孟媛媛
刘栋
杨双宾
李大明
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潍柴动力股份有限公司
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Abstract

The invention relates to a rail pressure control method for an engine, which comprises the following steps of: selecting a plurality of grade values comprising an upper limit and a lower limit according to a range of target rail pressure of the engine, and respectively acquiring a current reference value calculated based on the rotating speed and cycle fuel injection quantity when the target rail pressure is each grade value; determining the grade range of the current target rail pressure, and calculating the current current reference value through the current reference value corresponding to the upper limit and the lower limit of the grade range; calculating a voltage correction value, correspondingly calculating the sum of the current current reference value and the voltage correction value to obtain control current so as to control the rail pressure of the engine. The invention also provides a rail pressure pre-control method and a rail pressure pre-control system for the engine. An accurate current current reference value can be acquired, so the feedback control quantity is reduced. Therefore, overshoot is reduced, and the system response is accelerated.

Description

The rail pressure controlling method of motor, and preparatory controlling method of rail pressure and system

Technical field

The present invention relates to power engine control field, particularly a kind of rail pressure controlling method of motor, and rail pressure and controlling method and system.

Background technique

Usually, motor rail pressure controlling method mainly is to utilize the rail pressure of actual rail pressure P and target rail pressure Paim poor, obtains to control electric current (that is: I=PID (P through pid algorithm; Paim)); Utilize control Current Control rail pressure again, this controlling method can make the control electric current accurate inadequately only according to rail pressure difference compute control electric current; Cause control deviation big, control accuracy is lower.

At present, advanced rail pressure controlling method is that preparatory control of rail pressure and feedback control are combined, and rail pressure control in advance is to calculate the current reference value according to engine speed n and circulating fuel injection quantity Qinj; The rail pressure feedback control is the transient changing amount according to the rail pressure fluctuation, calculates the electric current correction value.With current reference value and the addition of electric current correction value, draw the control electric current through corresponding calculated again, the control rail pressure.This rail pressure controlling method control deviation is lower, and control accuracy is higher.

Referring to Fig. 1, the calculation method schematic representation of existing current reference value is shown.Be to depress among this Fig. 1, calculate the current reference value, but different target rail pressures will influence the decrement of fuel oil and the pump oil efficient of oil pump according to engine speed n and circulating fuel injection quantity Qinj at a certain specific target ghost; Engine speed n and circulating fuel injection quantity Qinj are changed to some extent; Like this, the current reference value of acquisition is just accurate inadequately, in rail pressure control; Need be in feedback control revise with big electric current correction value, this will cause overshoot excessive, influence system response time.

Summary of the invention

The object of the invention provides a kind of rail pressure controlling method of motor, and this method can make the feedback control amount reduce, thereby realizes reducing overshoot, quickening system responses.

The rail pressure controlling method of a kind of motor of the present invention, this method comprises:

According to the scope of engine target rail pressure, choose a plurality of grade points that comprise CLV ceiling limit value and lower limit, when obtaining the target rail pressure respectively, based on the current reference value of engine speed and circulating fuel injection quantity calculating for each grade point;

Judge current goal rail pressure place rate range, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value;

The calculating voltage correction value, with current current reference value and voltage correction value and after corresponding calculated, draw the control electric current, control motor rail pressure.

Preferably, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value and be specially:

I meun _ Base = P aim - P 1 P 2 - P 1 × I 1 + P 2 - P aim P 2 - P 1 × I 2

Wherein, I Meun_BeseBe current current reference value, Paim is the current goal rail pressure; P 1Be the lower limit of this grade scope, I 1Be P 1The current corresponding reference value; P 2Be the CLV ceiling limit value of this grade scope, I 2Be P 2The current corresponding reference value.

The preparatory controlling method of the rail pressure of a kind of motor of the present invention, this method comprises:

According to the scope of engine target rail pressure, choose a plurality of grade points that comprise CLV ceiling limit value and lower limit, when obtaining the target rail pressure respectively, based on the current reference value of engine speed n and circulating fuel injection quantity Qinj calculating for each grade point;

Judge current goal rail pressure place rate range, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value, utilize current current reference value to carry out rail pressure and control in advance.

Preferably, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value and be specially:

I meun _ Base = P aim - P 1 P 2 - P 1 × I 1 + P 2 - P aim P 2 - P 1 × I 2

Wherein, I Meun_BeseBe current current reference value, Paim is the current goal rail pressure; P 1Be the lower limit of this grade scope, I 1Be P 1The current corresponding reference value; P 2Be the CLV ceiling limit value of this grade scope, I 2Be P 2The current corresponding reference value.

The preparatory control system of the rail pressure of a kind of motor of the present invention comprises:

First module is used to receive engine speed and circulating fuel injection quantity, and the current reference value sent to four module when calculation engine target rail pressure was lower limit;

Second module is used to receive engine speed and circulating fuel injection quantity, and the current reference value sent to four module and the 5th module when calculation engine target rail pressure was middle limit value;

Three module is used to receive engine speed and circulating fuel injection quantity, and the current reference value sent to the 5th module when calculation engine target rail pressure was CLV ceiling limit value;

Current goal rail pressure judge module group is used to receive current present target rail pressure, when the current goal rail pressure is between CLV ceiling limit value and intermediate value, starts the 5th module; When the current goal rail pressure is between lower limit and intermediate value, start four module;

Four module is used to be activated the back and utilizes the current reference value that receives to calculate current reference current value;

The 5th module is used to be activated the back and utilizes the current reference value that receives to calculate current reference current value.

Preferably, current goal rail pressure judge module group comprises:

Whether the 6th module is used to judge current present target rail pressure more than or equal to lower limit, is then to send high level signal to the ten modules, otherwise sends low level signal to the ten modules;

Whether the 7th module is used to judge current present target rail pressure smaller or equal to intermediate value, is then to send high level signal to the ten modules, otherwise sends low level signal to the ten modules;

Whether the 8th module is used to judge current present target rail pressure greater than intermediate value, is then to send high level signal to the 11 modules, otherwise sends low level signal to the 11 modules;

Whether the 9th module is used to judge current present target rail pressure smaller or equal to CLV ceiling limit value, is then to send high level signal to the 11 modules, otherwise sends low level signal to the 11 modules;

The tenth module and the 11 module are the logical AND module, and the tenth module connects the startup end of four module, and the 11 module connects the startup end of the 5th module;

The tenth module is sent actuating signal to four module when being used to receive high level;

The 11 module is sent actuating signal to the five modules when being used to receive high level.

Compared with prior art, the present invention has the following advantages:

The present invention is through calculating the target rail pressure current corresponding reference value of different brackets; Judge the residing grade of current goal rail pressure Paim again; Utilize the pairing current reference value of this grade upper and lower target rail pressure, calculate current goal rail pressure Paim current corresponding reference value I Meun_Bese, this reference current value I Meun_BeseMore accurate.In rail pressure control, can make that voltage correction value scope is littler, the feedback control amount is reduced, thereby realize reducing overshoot, quickening system responses.

Description of drawings

Fig. 1 is the calculation method schematic representation of existing current reference value;

Fig. 2 is the calculation method schematic representation of current reference value of the present invention;

Fig. 3 is a rail pressure controlling method flow chart of the present invention;

Fig. 4 is the calculation method schematic representation of current reference value of the present invention;

Fig. 5 is the preparatory controlling method flow chart of rail pressure of the present invention;

Fig. 6 is a current reference value computational logic illustraton of model of the present invention.

Embodiment

For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.

The present invention introduces this variable of target rail pressure Paim in rail pressure control, take all factors into consideration engine speed n, circulating fuel injection quantity Qinj and target rail pressure three aspect factor in the control in advance in rail pressure, calculates the current reference value.So just, be implemented under engine speed n and the essentially identical condition of circulating fuel injection quantity Qinj, calculate the current reference value under the different rail pressures more accurately, and then can reduce preparatory controlled quentity controlled variable deviation greatly, improve the rail pressure control accuracy.Referring to Fig. 2, the calculation method schematic representation of current reference value is shown, calculate the current reference value based on engine speed n, circulating fuel injection quantity Qinj and target rail pressure Paim.

Referring to Fig. 3, rail pressure controlling method flow chart of the present invention is shown, specifically may further comprise the steps.

Step S201, according to the scope of the target rail pressure of motor, choose a plurality of grade points that comprise CLV ceiling limit value and lower limit, when obtaining the target rail pressure respectively, based on the current reference value of engine speed n with circulating fuel injection quantity Qinj calculating for each grade point.

For example, the target rail pressure is divided into P 1, P 2, P 3Three Estate value, wherein P 1Be lower limit, P 1For lower limit is some intermediate values, P 3Be CLV ceiling limit value, establishing target rail pressure Paim is P respectively 1, P 2, P 3The time, based on the two-dimensional representation (as shown in Figure 4) of engine speed n and circulating fuel injection quantity Qinj, obtain P according to this Fig. 3 1, P 2, P 3The current corresponding reference value I 1, I 2, I 3

Step S302, judgement current goal rail pressure Paim belong to rate range, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value I Meun_Bese

For example, if P 1<paim<p 2, then:

I Meun _ Base = P Aim - P 1 P 2 - P 1 &times; I 1 + P 2 - P Aim P 2 - P 1 &times; I 2 Formula 1

According to formula 1, obtain based on engine speed n, circulating fuel injection quantity Qinj and three variable precise current of target rail pressure reference value.

Step S303, calculating voltage correction value, with current reference value and voltage correction value and after corresponding calculated, draw the control electric current, control motor rail pressure.

The present invention is through calculating the target rail pressure current corresponding reference value of different brackets; Judge the residing grade of current goal rail pressure Paim again; Utilize the pairing current reference value of this grade upper and lower target rail pressure, calculate current goal rail pressure Paim current corresponding reference value I Meun_Bese, this reference current value I Meun_BeseMore accurate.In rail pressure control, can make that voltage correction value scope is littler, the feedback control amount is reduced, thereby realize reducing overshoot, quickening system responses.

Need to prove that the present invention is based on engine speed n and circulating fuel injection quantity Qinj calculating electric current and adopt existing computational methods with regard to collimation, these computational methods are well known to a person skilled in the art.The present invention utilizes current reference value and voltage correction value compute control electric current also to adopt existing computational methods, and these computational methods are well known to a person skilled in the art.

Based on above-mentioned rail pressure controlling method, the present invention also provides a kind of rail pressure preparatory controlling method.Referring to Fig. 5, the preparatory controlling method of rail pressure of the present invention is shown, concrete steps are following.

Step S501, according to the scope of the target rail pressure of motor, choose a plurality of grade points that comprise CLV ceiling limit value and lower limit, when obtaining the target rail pressure respectively, based on the current reference value of engine speed n with circulating fuel injection quantity Qinj calculating for each grade point.

For example, the target rail pressure is divided into P 1, P 2, P 3Three Estate value, wherein P 1Be lower limit, P 1For lower limit is some intermediate values, P 3Be CLV ceiling limit value, establishing target rail pressure Paim is P respectively 1, P 2, P 3The time, based on the two-dimensional representation (as shown in Figure 4) of engine speed n and circulating fuel injection quantity Qinj, obtain P according to this Fig. 3 1, P 2, P 3The current corresponding reference value I 1, I 2, I 3

Step S502, judgement current goal rail pressure Paim belong to rate range, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value I Meun_Bese, based on this current current reference value I Meun_BeseCarrying out rail pressure controls in advance.

For example, if P 1<paim<p 2, then:

I Meun _ Base = P Aim - P 1 P 2 - P 1 &times; I 1 + P 2 - P Aim P 2 - P 1 &times; I 2 Formula 1

According to formula 1, obtain based on engine speed n, circulating fuel injection quantity Qinj and three variable precise current of target rail pressure reference value.

Based on above-mentioned rail pressure controlling method, the present invention also provides a kind of rail pressure preparatory control system.Referring to Fig. 6, current reference value computational logic illustraton of model of the present invention is shown.Engine speed n, circulating fuel injection quantity Qinj import first module 11, second module 12, three module 13 respectively; It is lower limit (as 800) that first module 11, second module 12, three module 13 calculate the target rail pressure respectively, current reference value I when intermediate value (as 1000), CLV ceiling limit value (as 1200) 1, I 2, I 3With I 1, I 2Send to four module 14, I2, I3 send to the 5th module 15.

Current present target rail pressure Paim is sent to the 6th module 16, the 7th module 17, the 8th module 18 and the 9th module 19 respectively; The 6th module 16 judges that whether current present target rail pressure Paim is more than or equal to 800; Be then to send high level signal to the ten modules 20, otherwise send low level signal to the ten modules 20; Whether the 7th module 17 judges current present target rail pressure Paim smaller or equal to 1000, is then to send high level signal to the ten modules 20, otherwise sends low level signal to the ten modules 20; Whether the 8th module 18 judges current present target rail pressure Paim greater than 1000, is then to send high level signal to the 11 modules 21, otherwise sends low level signal to the 11 modules 21; Whether the 9th module 19 judges current present target rail pressure Paim smaller or equal to 1200, is then to send high level signal to the 11 modules 21, otherwise sends low level signal to the 11 modules 21.

The tenth module 20 and the 11 module 21 are the logical AND module; The tenth module 20 connects the startup end of four module 14; The 11 module 21 connects the startup end of the 5th module 15; Receive the tenth module 20 or the 11 module 21 of high level, send actuating signal to four module 14 or the 5th module 15.

The 6th module 16, the 7th module 17, the 8th module 18, the 9th module 19, the tenth module 20 and the 11 module 21 are current goal rail pressure judge module group.

Four module 14 or the 5th module 15 are calculated current reference current value by the algorithm that presets (formula 1).

Among Fig. 6, Eng_nAvrg is an engine speed, unit: rev/min; InjCtl_qCurr is a fuel injection quantity, unit: milligram/cylinder; Rail_pSetPoint is a rail pressure, unit: 105 handkerchiefs/square metre.

The above is merely preferred implementation of the present invention, does not constitute the qualification to protection domain of the present invention.Any any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection domain of the present invention.

Claims (6)

1. the rail pressure controlling method of a motor is characterized in that, this method comprises:
According to the scope of engine target rail pressure, choose a plurality of grade points that comprise CLV ceiling limit value and lower limit, when obtaining the target rail pressure respectively, based on the current reference value of engine speed and circulating fuel injection quantity calculating for each grade point;
Judge current goal rail pressure place rate range, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value;
The calculating voltage correction value, with current current reference value and voltage correction value and after corresponding calculated, draw the control electric current, control motor rail pressure.
2. the method for claim 1 is characterized in that, utilizes the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculates current current reference value and is specially:
I meun _ Base = P aim - P 1 P 2 - P 1 &times; I 1 + P 2 - P aim P 2 - P 1 &times; I 2
Wherein, I Meun_BeseBe current current reference value, Paim is the current goal rail pressure; P 1Be the lower limit of this grade scope, I 1Be P 1The current corresponding reference value; P 2Be the CLV ceiling limit value of this grade scope, I 2Be P 2The current corresponding reference value.
3. the preparatory controlling method of the rail pressure of a motor is characterized in that, this method comprises:
According to the scope of engine target rail pressure, choose a plurality of grade points that comprise CLV ceiling limit value and lower limit, when obtaining the target rail pressure respectively, based on the current reference value of engine speed n and circulating fuel injection quantity Qinj calculating for each grade point;
Judge current goal rail pressure place rate range, utilize the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculate current current reference value, utilize current current reference value to carry out rail pressure and control in advance.
4. method as claimed in claim 3 is characterized in that, utilizes the CLV ceiling limit value and the pairing current reference value of lower limit of this grade scope, calculates current current reference value and is specially:
I meun _ Base = P aim - P 1 P 2 - P 1 &times; I 1 + P 2 - P aim P 2 - P 1 &times; I 2
Wherein, I Meun_BeseBe current current reference value, Paim is the current goal rail pressure; P 1Be the lower limit of this grade scope, I 1Be P 1The current corresponding reference value; P 2Be the CLV ceiling limit value of this grade scope, I 2Be P 2The current corresponding reference value.
5. the preparatory control system of the rail pressure of a motor is characterized in that, comprising:
First module is used to receive engine speed and circulating fuel injection quantity, and the current reference value sent to four module when calculation engine target rail pressure was lower limit;
Second module is used to receive engine speed and circulating fuel injection quantity, and the current reference value sent to four module and the 5th module when calculation engine target rail pressure was middle limit value;
Three module is used to receive engine speed and circulating fuel injection quantity, and the current reference value sent to the 5th module when calculation engine target rail pressure was CLV ceiling limit value;
Current goal rail pressure judge module group is used to receive current present target rail pressure, when the current goal rail pressure is between CLV ceiling limit value and intermediate value, starts the 5th module; When the current goal rail pressure is between lower limit and intermediate value, start four module;
Four module is used to be activated the back and utilizes the current reference value that receives to calculate current reference current value;
The 5th module is used to be activated the back and utilizes the current reference value that receives to calculate current reference current value.
6. system as claimed in claim 5 is characterized in that, current goal rail pressure judge module group comprises:
Whether the 6th module is used to judge current present target rail pressure more than or equal to lower limit, is then to send high level signal to the ten modules, otherwise sends low level signal to the ten modules;
Whether the 7th module is used to judge current present target rail pressure smaller or equal to intermediate value, is then to send high level signal to the ten modules, otherwise sends low level signal to the ten modules;
Whether the 8th module is used to judge current present target rail pressure greater than intermediate value, is then to send high level signal to the 11 modules, otherwise sends low level signal to the 11 modules;
Whether the 9th module is used to judge current present target rail pressure smaller or equal to CLV ceiling limit value, is then to send high level signal to the 11 modules, otherwise sends low level signal to the 11 modules;
The tenth module and the 11 module are the logical AND module, and the tenth module connects the startup end of four module, and the 11 module connects the startup end of the 5th module;
The tenth module is sent actuating signal to four module when being used to receive high level;
The 11 module is sent actuating signal to the five modules when being used to receive high level.
CN2010106017667A 2010-12-22 2010-12-22 Rail pressure control method and rail pressure pre-control method and system for engine CN102062007B (en)

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Publication number Priority date Publication date Assignee Title
CN102425503B (en) * 2011-09-22 2013-10-09 中国汽车技术研究中心 Rail pressure pre-control system based on hardware constant-current control and control method
CN102374055B (en) * 2011-09-22 2014-05-28 中国汽车技术研究中心 Engine rail press precontrol and feedback control device as well as control system and control method
CN103883409B (en) * 2014-03-14 2017-02-15 潍柴动力股份有限公司 Double-actuator switching control method and device

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