CN104373235B - High-pressure common rail piezo actuator drives current control circuit - Google Patents
High-pressure common rail piezo actuator drives current control circuit Download PDFInfo
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Abstract
The invention discloses a kind of high pressure co-rail system piezo actuator charge and discharge and drive current control circuit, comprising: the anti-phase processing circuit of charging current modulation circuit, discharge current, discharge current modulation circuit.In charge and discharge current modulating circuit, change along with charge and discharge electric current, resistance annexation in current threshold bleeder circuit is directly affected by switching device transistor, control the change of current threshold size, and two threshold values mutually change, charge and discharge current modulating circuit exports the pwm signal determined by the two current threshold.The invention have the advantage that present invention achieves piezo actuator charge and discharge drives the control of size of current, this drive circuit is simple, and drive the modulated process of electric current to be realized by hardware completely, fundamentally ensure that the concordance of electric current, take MCU resource few simultaneously.
Description
Technical field
The present invention relates to piezo actuator actuation techniques, specifically a kind of diesel engine high-pressure co-rail system piezo actuator drives current control device.
Background technology
Before piezo actuator oil spout, the energy stored on piezo actuator is little, piezo actuator voltage is the lowest, when piezoelectricity performs commencement of fuel injection, it is directly charged by 150V voltage, at charging initial instant, the electric current that piezo actuator flows through can be the biggest, may result in piezo actuator elongation deformation acceleration the biggest, although this problem can be alleviated by adding pretightning force, but if a kind of piezo actuator charge and discharge loop of design drives current control circuit will fundamentally solve this problem.If same discharge current is too big, piezo actuator is caused to shorten deformation acceleration the biggest, it is also desirable to design discharge loop discharge current control circuit fundamentally solves this problem, and ensures each charge and discharge Current compliance.
Piezoquartz drives and comprises the driving of charge and discharge loop, therefore piezoquartz drives electric current to control also is to control the two drive circuit electric current accordingly, the current control method to the two electric current is substantially current sampling resistor voltage and compares output with set threshold voltage, driving pressure electric actuator charge and discharge circuit is exported by certain logical relation copped wave, it is achieved charge and discharge electric current is controlled with the pwm signal of fixed frequency dutycycle.
This solution is not real closed-loop current control, it is easy to cause the inconsistent of charge and discharge electric current.The frequency of pwm signal and dutycycle also non-precision value simultaneously, enables the logical relation between signal to pwm signal and charge and discharge and proposes certain requirement, not only bring certain difficulty to software programming, and waste MCU resource.
Chinese patent CN101684758A diesel engine for automobile piezoelectric-type high-pressure common-rail injection system control unit, this patent relate to a kind of piezo actuator current control method.This patent controls to electric current the means used and the effect reached: piezo actuator charging current is divided, by current sampling resistor voltage and CPLD, the pwm signal produced and together decides on, it is achieved the closed loop control of charging current.The deficiency of this patent and reason: 1, the pwm signal duty when frequency that CPLD frequency dividing produces is an empirical value according to personal set, and the logical sequence that this scheme enables signal to pwm signal and charging there are certain requirements, software programming is complicated, and take resource, if not according to this logical sequence, charging current waveform will be caused inconsistent, and each charging interval is also not quite similar, and in this patent, piezoquartz discharge current size is not carried out closed loop control.2, to determine the piezo actuator charge and discharge time relevant to the current threshold of setting and pwm signal frequency both of which for this technical scheme.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, a kind of high-pressure common rail piezo actuator is provided to drive current control circuit, realize effective control of the charge and discharge size of current of piezo actuator, the driving electric current of piezo actuator is carried out closed loop control.
The technical scheme provided according to the present invention, described high-pressure common rail piezo actuator drives current control circuit to include: the anti-phase processing circuit of charging current modulation circuit, discharge current, discharge current modulation circuit, the anti-phase processing circuit of described discharge current includes resistance R1, R2 and R3, the input point of the anti-phase processing circuit of discharge current is connected in the charge and discharge loop of piezo actuator, on the one hand described input point connects+V power supply through resistance R2 and resistance R1, on the other hand through resistance R3 ground connection；
Described charging current modulation circuit includes: three resistance R4, R5, R6 are sequentially connected in series charging current threshold value bleeder circuit, wherein the high pressure termination+V power supply of resistance R4, the low-pressure end ground connection of resistance R6；The junction point voltage of resistance R4 Yu R5 is threshold value branch pressure voltage, access the end of oppisite phase of comparator U18, the input point of the comparator U18 homophase termination anti-phase processing circuit of discharge current, the output of comparator U18 is connected with transistor Q12 base stage through resistance R7, it is made to be operated on or off state, transistor Q12 grounded emitter, the junction point of colelctor electrode connecting resistance R5 and R6, the outfan of comparator U18 is pulled to+V power supply through resistance 21, and connect the input of not gate U20, not gate U20 output i.e. charging current modulation (PWM) signal；
Described discharge current modulation circuit includes: three resistance R8, R9, R10 are sequentially connected in series discharging current threshold bleeder circuit, wherein the high pressure termination+V power supply of resistance R8, the low-pressure end ground connection of resistance R10；The junction point voltage of resistance R8 Yu R9 is threshold value branch pressure voltage, access the end of oppisite phase of comparator U19, the junction point of comparator U19 in-phase end connecting resistance R1 and R2, the output of comparator U19 is connected with transistor Q13 base stage through resistance R11, it is made to be operated on or off state, transistor Q13 grounded emitter, the junction point of colelctor electrode connecting resistance R9 and R10, comparator U19 outfan is pulled to+V power supply through resistance R22, the output of comparator U19 i.e. discharge current modulation (PWM) signal.
In described charging current modulation circuit, change along with charging current, resistance R6 annexation in charging current threshold value bleeder circuit is directly affected by switching device transistor Q12, control the change of current threshold size, and two threshold values mutually change, charging current modulation circuit exports the pwm signal determined by the two current threshold.
In described discharge current modulation circuit, change along with discharge current, resistance R10 annexation in discharging current threshold bleeder circuit is directly affected by switching device transistor Q13, control the change of current threshold size, and two threshold values mutually change, discharge current modulation circuit exports the pwm signal determined by the two current threshold.
In discharge process, the output voltage of sampling resistor R3 is concatenated resistance R1, R2 and is connected to+V power supply, and series resistance R1, the junction point voltage of R2 are discharge current sampled voltage.
Wherein, resistance R1, R2, R4, R5, R6, R8, R9, R10 all uses precision resistance.
The invention have the advantage that present invention achieves piezo actuator charge and discharge drives the control of size of current, this drive circuit is simple, and drive the modulated process of electric current to be realized by hardware completely, fundamentally ensure that the concordance of electric current, take MCU resource few simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the present invention.
Fig. 2 is piezo actuator of the present invention charging, control of discharge sequential and charging, discharge current waveform figure.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As it is shown in figure 1, the high pressure co-rail system piezo actuator charge and discharge of the present invention drive current control circuit 17 to include: the anti-phase processing circuit of charging current modulation circuit 14, discharge current 15,16 3 parts of discharge current modulation circuit.
Charging current modulation circuit 14 includes a comparator U18, five resistance R4, R5, R6, R7, R21, a transistor Q12 and a not gate U20；Annexation between each device is described as follows: three resistance R4, R5, R6 are sequentially connected in series charging current threshold value bleeder circuit, wherein the high pressure termination+V power supply of resistance R4, the low-pressure end ground connection of resistance R6；The junction point voltage of resistance R4 Yu R5 is threshold value branch pressure voltage, access the end of oppisite phase of comparator U18, the input point of the comparator U18 homophase termination anti-phase processing circuit of discharge current 15, the output of comparator U18 is connected with transistor Q12 base stage through resistance R7, it is made to be operated on or off state, transistor Q12 grounded emitter, the junction point of colelctor electrode connecting resistance R5 and R6, the outfan of comparator U18 is pulled to+V power supply through resistance 21, and connect the input of not gate U20, not gate U20 output i.e. charging current modulation (PWM) signal, not gate output realizes piezo actuator charging signals with other control signals according to certain logical relation.
The anti-phase processing circuit of discharge current 15 comprises three resistance R1, R2, R3；Resistance R1, R2 are connected in series, and resistance R1 mono-terminates+V power supply, and resistance R2 mono-terminating resistor R3's is high-end, and the point voltage that is connected in series of resistance R1, R2 is discharge current sampled voltage.
Discharge current modulation circuit 16 includes a comparator U19, five resistance R8, R9, R10, R11, R22, a transistor Q13；Annexation is described as follows: three resistance R8, R9, R10 are sequentially connected in series discharging current threshold bleeder circuit, wherein the high pressure termination+V power supply of resistance R8, the low-pressure end ground connection of resistance R10；The junction point voltage of resistance R8 Yu R9 is threshold value branch pressure voltage, access the end of oppisite phase of comparator U19, the junction point of comparator U19 in-phase end connecting resistance R1 and R2, the output of comparator U19 is connected with transistor Q13 base stage through resistance R11, it is made to be operated on or off state, transistor Q13 grounded emitter, the junction point of colelctor electrode connecting resistance R9 and R10, the output of comparator U19 is connected by pull-up resistor R22 and+V power supply, the output discharge current modulation (PWM) signal of comparator U19, piezo actuator discharge signal is realized according to certain logical relation with other control signals.
The present invention devises piezo actuator charge and discharge current modulating circuit, completely realized setting two charging current threshold values in circuit by hardware circuit, and charging current threshold value mutually converts between two values, charging current modulation is made to export between two threshold values of this setting, as shown in Figure 2.Charging current modulation output and charging enable and jointly drive charging circuit according to certain logical relation between signal, charging voltage feedback signal three.The modulation output of discharge current is similar with charging current, sets two discharging current threshold in discharge current modulation circuit.
The on off state of charging current threshold comparator U18 output control transistor Q12, transistor Q12 is on or off-state, and constantly switches between two states.When transistor Q12 ends, the all-in resistance of resistance R5, R6 series connection power supply dividing potential drop, current threshold are increased；When transistor Q12 turns on, forcing the junction point ground connection of resistance R5, R6, power supply dividing potential drop, current threshold are diminished by resistance R5.Comparator U18 exports corresponding pwm signal according to the threshold adjustment set, and controls the charging process of piezo actuator further.
Piezo actuator charging is the process of storage energy, discharge the most contrary, being the process released energy, therefore the charge and discharge sense of current is completely contrary, for current sampling resistor voltage, be charging process sampled voltage be positive voltage, and discharge process sampled voltage is negative voltage, therefore for simplifying discharge process sampled voltage modulate circuit, pass through principle of stacking, to one forward voltage of this voltage superposition, by adjusting divider resistance size, sampled voltage is changed into tractable forward voltage.
After the inverted process of discharge current sampled voltage, sampling and outputting voltage is the biggest, and discharge current is the least, and sampling and outputting voltage is the least, and discharge current is the biggest, the most contrary with charge current sample output.Although discharge current comparator modulation output services principle is substantially similar with charging process, but with other coherent signals according to the whole charging process of certain logic control after the output need inverted device process of charging current threshold comparator.
In the present invention, the output of charge and discharge current threshold comparator controls the duty of respective transistor, and the on or off of transistor determines charge and discharge current threshold size.
The working method that the present invention described in detail below implements.
At the injection process of piezoelectric-type high-pressure common-rail system, piezo actuator comprises charging, two processes of electric discharge.When ECU sends oil spout enable signal, piezo actuator starts to charge up, and reaches its charging voltage set after certain charging interval, and charging process terminates.As shown in Figure 1, M1 is piezo actuator charge circuit switching tube, M3 is piezo actuator low side gating switch pipe, the most effectively ,+HIGH_V charges to piezo actuator C23 through M1, current-limiting inductance L, M3, resistance R3, and piezo actuator C23 voltage is gradually increasing for charging process transistor M1, M3, when reaching its charging voltage, executor's voltage feedback circuit invalid piezo actuator charging circuit, transistor M1 turns off, completes charging process.In injection process, low side gating transistor M3 tends to remain on, and piezo actuator C23 voltage maintains charging voltage value always, and during end of injection, piezo actuator C23 discharges charging voltage.M2 is piezo actuator discharge loop switching tube, M2 conducting in discharge process, the loop release voltage that piezo actuator C23 voltage forms through current-limiting inductance L, transistor M2, resistance R3 and transistor M3, piezo actuator C23 voltage is gradually lowered, when reaching its discharge voltage set, voltage feedback loop invalid piezo actuator discharge loop, transistor M2 closes, and discharge process terminates.
In order to ensure the fast-response of piezo actuator, need the voltage quick charge of piezo actuator C23 to its setting voltage, it is therefore desirable to by DC/DC Boost circuit, vehicle power is boosted to the high pressure of+HIGH_V, typically at about 150V.
When diesel engine commencement of fuel injection, MCU sends charging and enables signal, piezo actuator C23 charging voltage, electric current are zero, charging voltage feedback comparator output high level, comparator U18 output low level in charging current modulation circuit 14, transistor Q12 ends, resistance R4, R5, R6 are connected in series, bleeder circuit is formed with+V power supply (such as+5V), the series resistance of two resistance R5, R6 carries out dividing potential drop to total series resistance, the anti-phase input terminal voltage of comparator U18 is this branch pressure voltage, forms charging current threshold value 1.nullCurrent feedback comparator U18 output low level and after not gate U20 is anti-phase，Signal is enabled with MCU charging、Charging voltage feedback signal enables charge circuit power device M1 after certain logical process，+ HIGH_V high pressure passes through diode D1、Piezo actuator C23 is charged by current-limiting inductance L，Piezo actuator C23 charging voltage、Electric current is gradually increasing，When charging current reaches its threshold value 1 set，Current-modulation comparator U18 exports high level，Transistor Q12 opens，Make resistance R5、R6 is connected in series a ground connection，The equal ground connection in resistance R6 two ends and be shorted，Resistance R4、R5 series connection forms bleeder circuit with+V power supply，The anti-phase input terminal voltage of comparator U18 becomes this branch pressure voltage，Form charging current threshold value 2，Charging current threshold value 2 is less than charging current threshold value 1 obviously.nullCurrent feedback comparator U18 output high level is after not gate U20 is anti-phase，Signal is enabled with MCU charging、Voltage feedback signal turns off charge circuit power device M1 after certain logical process，Inverse electromotive force in current-limiting inductance L continues to charge to piezo actuator C23 by the body diode of discharge loop power device M2，Piezo actuator C23 charging current is gradually lowered，When it drops to the current threshold 2 of setting，The current-modulation comparator U18 output low level again of charge circuit，Transistor Q12 ends，The anti-phase input terminal voltage of comparator U18 becomes again charging current threshold value 1，Charge power device M1 turns on again，+ HIGH_V high pressure continues again to charge to piezo actuator C23，Electric current is gradually increasing，When electric current reaches its charging current threshold value 1 set again，Current-modulation comparator U18 reverse inter-input-ing voltage becomes again charging current threshold value 2，Turn off charge power device M1，Current-limiting inductance L inverse electromotive force continues charging through M2 body diode to piezo actuator C23，Charging current is gradually reduced，And so forth，Until the charging voltage of piezo actuator C23 reaches its voltage threshold set，Voltage feedback circuit output low level，Thoroughly turn off charge circuit power device M1，The charging process of piezo actuator C23 completes.In above-mentioned charging current threshold value bleeder circuit, resistance R4, R5, R6 use precision resistance, to ensure the concordance of charging current threshold value.
Two stages in charging process, charging current all flow to ground by current-limiting inductance L, piezo actuator C23, current sampling resistor R3, and charging current sampling directly samples from sampling resistor R3, and charging current is the biggest, its sampling voltage is the biggest, and both one-tenth compare relation.In discharge process, the energy stored in piezo actuator C23 flow to piezo actuator negative terminal through current-limiting inductance L and sampling resistor R3, form Releasing loop, the discharge current direction of piezo actuator C23 is the most contrary with charging current, if discharge current directly samples from sampling resistor R3, its sampling voltage is negative level, therefore this piezo actuator drives current control device that negative supply must be had to process circuit, therefore in circuit design, the discharge voltage that samples of resistance R3 is passed through resistance R1 with+V supply voltage, R2 superposition, resistance R1, it is discharge current sampling output that R2 is connected in series point voltage, and discharge current is the biggest, sampling output is the least, resistance R1, R2 uses precision resistance.
When piezo actuator C23 end of injection, piezo actuator C23 starts electric discharge, and owing to the sampling of piezo actuator C23 discharge current differs with charge current sample, therefore discharge current modulation circuit 16 is also not quite similar with charging current modulation circuit 14.nullDischarge current sampling output accesses comparator U19 in-phase input end，Series resistance R8 in discharging current threshold bleeder circuit、The junction point of R9 connects the inverting input of comparator U19，When MCU sends electric discharge enable signal，Though piezo actuator C23 discharge current is zero，But discharge current sampled voltage is more than threshold voltage，Comparator U19 exports high level，Transistor Q13 turns on，At resistance R8、R9、In the discharging current threshold bleeder circuit of R10 composition，Resistance R9、R10 is connected in series a ground connection，Resistance R10 two ends shorted to earth，+ V power supply and resistance R8、R9 forms threshold value bleeder circuit，Form discharging current threshold 3，This threshold value 3 not up to set due to comparator U19 output high level and discharge current，Three signals are through certain logical process rear drive discharge power device M2，The energy stored in piezo actuator C23 is by current-limiting inductance L、Power tube M2、Sampling resistor R3 forms discharge loop；Discharge current is gradually increased, discharge current sampling output is gradually reduced, when discharge current reaches its threshold value 3 set, comparator U19 output low level, transistor Q13 ends, resistance R9, series resistance right+V power supply the dividing potential drop of R10 composition, form discharging current threshold 4, obviously discharging current threshold 3 is less than threshold value 4, comparator U19 output low level, certain logical relation turns off discharge power device M2 after processing, the energy stored in current-limiting inductance L is charged to DC/DC Boost circuit electric capacity by M1 body diode, discharge current tapers into, when discharge current reaches its threshold value 4 set, comparator U19 exports high level, it is again turned on discharge power device M2, and discharging current threshold becomes again threshold value 3, piezo actuator continues through M2 electric discharge；Discharge current becomes larger, when reaching to set threshold value 3, comparator U19 output low level again, turn off discharge power device M2 and discharge current sampled voltage becomes again threshold value 4, M2 turns off, and piezo actuator C23 is charged to DC/DC Boost electric capacity again by current-limiting inductance L, and electric current is gradually lowered；And so forth, in piezo actuator C23, the energy of storage is fewer and feweri, and voltage reduces the most accordingly, sets threshold value when discharge voltage reaches it, and discharge voltage comparator output low level thoroughly turns off whole discharge process, and piezo actuator discharge process completes.In above-mentioned discharging current threshold bleeder circuit, resistance R8, R9, R10 use precision resistance, to ensure the concordance of discharging current threshold.
Above it will be seen that the invention have the characteristics that:
1, electric current PWM modulation signal is realized by hardware completely, simple and reliable, drives Current compliance good.
The size of the average current in 2, charge and discharge current threshold determines the charge and discharge time, therefore the charge and discharge time of piezo actuator is only determined by the two threshold value.
Claims (7)
1. high-pressure common rail piezo actuator drives current control circuit, it is characterized in that, including: charging current modulation circuit (14), the anti-phase processing circuit of discharge current (15), discharge current modulation circuit (16), the anti-phase processing circuit of described discharge current (15) includes resistance R1, R2 and R3, the input point of the anti-phase processing circuit of discharge current (15) is connected in the charge and discharge loop of piezo actuator, on the one hand described input point connects+V power supply through resistance R2 and resistance R1, on the other hand through resistance R3 ground connection；
Described charging current modulation circuit (14) including: three resistance R4, R5, R6 are sequentially connected in series charging current threshold value bleeder circuit, wherein the high pressure termination+V power supply of resistance R4, the low-pressure end ground connection of resistance R6；The junction point voltage of resistance R4 Yu R5 is threshold value branch pressure voltage, access the end of oppisite phase of comparator U18, the input point of the comparator U18 homophase termination anti-phase processing circuit of discharge current (15), the output of comparator U18 is connected with transistor Q12 base stage through resistance R7, it is made to be operated on or off state, transistor Q12 grounded emitter, the junction point of colelctor electrode connecting resistance R5 and R6, the outfan of comparator U18 is pulled to+V power supply through resistance 21, and connect the input of not gate U20, not gate U20 output i.e. charging current modulation (PWM) signal；
Described discharge current modulation circuit (16) including: three resistance R8, R9, R10 are sequentially connected in series discharging current threshold bleeder circuit, wherein the high pressure termination+V power supply of resistance R8, the low-pressure end ground connection of resistance R10；The junction point voltage of resistance R8 Yu R9 is threshold value branch pressure voltage, access the end of oppisite phase of comparator U19, the junction point of comparator U19 in-phase end connecting resistance R1 and R2, the output of comparator U19 is connected with transistor Q13 base stage through resistance R11, it is made to be operated on or off state, transistor Q13 grounded emitter, the junction point of colelctor electrode connecting resistance R9 and R10, comparator U19 outfan is pulled to+V power supply through resistance R22, the output of comparator U19 i.e. discharge current modulation (PWM) signal.
2. high-pressure common rail piezo actuator drives current control circuit as claimed in claim 1, it is characterized in that, in described charging current modulation circuit (14), change along with charging current, resistance R6 annexation in charging current threshold value bleeder circuit is directly affected by switching device transistor Q12, controlling the change of current threshold size, and two threshold values are mutually changed, charging current modulation circuit (14) exports the pwm signal determined by the two current threshold；
In the charging current threshold value bleeder circuit of described resistance R4, R5, R6 composition, resistance R4, R5, the R6 being connected in series forms bleeder circuit with+V power supply, the series resistance of two resistance R5, R6 carries out dividing potential drop to total series resistance, the anti-phase input terminal voltage of comparator U18 is this branch pressure voltage, forms first charging current threshold value in said two threshold value；
Resistance R4, R5 series connection forms bleeder circuit with+V power supply, and the anti-phase input terminal voltage of comparator U18 becomes this branch pressure voltage, forms second charging current threshold value in said two threshold value.
3. high-pressure common rail piezo actuator drives current control circuit as claimed in claim 1, it is characterized in that, in described discharge current modulation circuit (16), change along with discharge current, resistance R10 annexation in discharging current threshold bleeder circuit is directly affected by switching device transistor Q13, controlling the change of current threshold size, and two threshold values are mutually changed, discharge current modulation circuit (16) exports the pwm signal determined by the two current threshold；
In the discharging current threshold bleeder circuit of described resistance R8, R9, R10 composition, resistance R9, R10 are connected in series a ground connection, resistance R10 two ends shorted to earth ,+V power supply and resistance R8, R9 form threshold value bleeder circuit, form first discharging current threshold in said two threshold value；
Series resistance right+V power supply the dividing potential drop of resistance R9, R10 composition, forms second discharging current threshold in said two threshold value.
4. high-pressure common rail piezo actuator drives current control circuit as claimed in claim 1, it is characterized in that, in discharge process, the output voltage of sampling resistor R3 is concatenated resistance R1, R2 and is connected to+V power supply, and series resistance R1, the junction point voltage of R2 are discharge current sampled voltage.
5. high-pressure common rail piezo actuator drives current control circuit as claimed in claim 1, it is characterized in that, in the anti-phase processing circuit of described discharge current (15), resistance R1, R2 use precision resistance.
6. high-pressure common rail piezo actuator drives current control circuit as claimed in claim 1, it is characterized in that, in described charging current modulation circuit (14), resistance R4, R5, R6 use precision resistance.
7. high-pressure common rail piezo actuator drives current control circuit as claimed in claim 1, it is characterized in that, in described discharge current modulation circuit (16), resistance R8, R9, R10 use precision resistance.
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| DE19931235C2 (en) * | 1999-07-07 | 2001-08-30 | Siemens Ag | Method and device for loading a capacitive actuator |
| DE19944734B4 (en) * | 1999-09-17 | 2007-02-15 | Siemens Ag | Method and device for charging at least one capacitive actuator |
| DE102004046192B4 (en) * | 2004-09-23 | 2006-12-28 | Siemens Ag | Circuit arrangement and method for charging and discharging at least one capacitive load |
| CN101636854B (en) * | 2007-02-23 | 2016-03-16 | 米其林技术学会 | For the method for discharging to capacity load |
| JP4526580B2 (en) * | 2008-07-07 | 2010-08-18 | 株式会社日本自動車部品総合研究所 | Piezo actuator drive unit |
| CN101684758A (en) * | 2008-09-26 | 2010-03-31 | 北京耀佳汽车电子技术有限公司 | Electronic control unit (ECU) of piezoelectric-type high-pressure common-rail injection system for vehicle diesel engine |
| CN203285554U (en) * | 2013-05-20 | 2013-11-13 | 第一拖拉机股份有限公司 | Highly-integrated diesel engine high-pressure common rail electronic control unit |
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