CN102536566B - System and method for performing fuel injector current waveform control by using enhanced time processor unit (eTPU) - Google Patents
System and method for performing fuel injector current waveform control by using enhanced time processor unit (eTPU) Download PDFInfo
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Abstract
The invention discloses a system for performing fuel injector current waveform control by using an enhanced time processor unit (eTPU). The eTPU comprises a fuel injector current waveform control system which comprises an opening current control module and a holding current control module, wherein the opening current control module comprises a first initialization module, a first oil injection starting judgment module, an opening current feedback inspection module and an opening current control finishing module, and the holding current control module comprises a second initialization module, a second oil injection starting judgment module and a holding current feedback inspection module. The system utilizes the eTPU to achieve the fuel injector current waveform control. The invention further discloses a method for performing fuel injector current waveform control by using the eTPU.
Description
Technical field
The present invention relates to a kind of system of oil sprayer Current Waveform Control.The invention still further relates to a kind of method of oil sprayer Current Waveform Control.
Background technique
Contemporary diesel engine, in order to improve its Economy and to improve its emission performance, adopts more accurate oil sprayer driving current imperative.The driving current of fuel injector magnetic system is divided into 2 stages, is respectively open stage and maintenance stage (seeing Fig. 1).Open stage, is with large electric current, solenoid valve to be opened fast, and the firing current of fuel injector magnetic system should remain in a constant scope; The maintenance stage is with less electric current, to keep the aperture of solenoid valve, within the maintenance electric current of fuel injector magnetic system also should remain on a constant scope.
In order to realize the boot last structure of electromagnetic valve driving current, abroad some companies are mainly used special chip, adopt the method for hardware copped wave, according to feedback current, constantly driving voltage are carried out to conducting and closure.For example, Robert Bosch Co., Ltd is used the special chip 30520 of Bosch, and it is for adopting mode of hardware copped wave to realize above-mentioned waveform, its chip on market, be buy less than, so just formed technical monopoly.In order to realize the boot last structure of electromagnetic valve driving current, more domestic companies and colleges and universities attempt adopting CPLD (hereinafter to be referred as CPLD, belonging to a kind of general chip) to carry out the copped wave of oil sprayer driving current.Employing CPLD carries out the chopping way of oil sprayer driving current, not only increased the cost of hardware, and the current peak peak value of copped wave is excessive, is unfavorable for accurately controlling fuel injection quantity.
Summary of the invention
The technical problem to be solved in the present invention is to provide the system that a kind of eTPU of use unit carries out oil sprayer Current Waveform Control, and it adopts eTPU unit to realize the control of oil sprayer current waveform.
For solving the problems of the technologies described above, use of the present invention eTPU unit carries out the system of oil sprayer Current Waveform Control, for comprise oil sprayer current waveform control system in eTPU unit, described oil sprayer current waveform control system comprises firing current control module and keeps current control module;
Described firing current control module is for when fuel injector magnetic system is started working, regularly the threshold value of the firing current feedback input signal of the firing current feed back input passage input by eTPU unit and fuel injector magnetic system unlatching chopper current is compared, and according to comparative result the copped wave control signal of two driving voltages of the output of the copped wave control channel by eTPU unit, control respectively the switching tube of two driving voltages of described fuel injector magnetic system, make the driving current of described fuel injector magnetic system remain on predetermined firing current left and right;
Described maintenance current control module is for after the opening time of described fuel injector magnetic system finishes, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input by eTPU unit and fuel injector magnetic system, and export compared with the copped wave control signal of low driving voltage by the copped wave control channel of eTPU unit according to comparative result, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make the driving current of described fuel injector magnetic system remain on the predetermined electric current left and right that keeps.
The present invention also provides a kind of eTPU of use unit to carry out the method for oil sprayer Current Waveform Control, and it is: adopt the firing current control module being arranged in eTPU unit to carry out the control of firing current; Described firing current control module is for when fuel injector magnetic system is started working, regularly the threshold value of the firing current feedback input signal of the firing current feed back input passage input by eTPU unit and fuel injector magnetic system unlatching chopper current is compared, and according to comparative result the copped wave control signal of two driving voltages of the output of the copped wave control channel by eTPU unit, control respectively the switching tube of two driving voltages of described fuel injector magnetic system, make the driving current of described fuel injector magnetic system remain on predetermined firing current left and right;
After the opening time finishes, adopt the maintenance current control module being arranged in eTPU unit to keep Current Control, described maintenance current control module is for after the opening time of described fuel injector magnetic system finishes, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input by eTPU unit and fuel injector magnetic system, and export compared with the copped wave control signal of low driving voltage by the copped wave control channel of eTPU unit according to comparative result, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make the driving current of described fuel injector magnetic system remain on the predetermined electric current left and right that keeps.
The present invention uses eTPU unit to carry out the system of oil sprayer Current Waveform Control, adopt eTPU unit to realize the control of current waveform, not only the cost of hardware circuit can be greatly saved, the technology barriers that overseas enterprise monopolizes own special chip can also be broken.The present invention simultaneously also utilizes in same eTPU program, and eTPU passage carries out the technology of mutually switching, and Current Control program is improved.Owing to having saved the scheduling time of eTPU, make the response of fuel injector magnetic system current drive signal rapider, not only more accurate to oil sprayer Current Waveform Control, also improved operational efficiency and the stability of software.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation:
Fig. 1 is the driving current schematic diagram of the fuel injector magnetic system of boot last structure;
Fig. 2 is system schematic of the present invention;
Fig. 3 is the schematic block diagram of firing current control module of the present invention;
Fig. 4 is the schematic block diagram of maintenance current control module of the present invention;
Fig. 5 is the concrete initialization module workflow schematic diagram in firing current control module of the present invention;
Fig. 6 is the concrete initial judge module workflow of the first oil spout schematic diagram in firing current control module of the present invention;
Fig. 7 is that the concrete firing current in firing current control module of the present invention feeds back checking module workflow schematic diagram;
Fig. 8 is that the concrete firing current in firing current control module of the present invention is controlled end module workflow schematic diagram;
Fig. 9 is the concrete second initialization module workflow schematic diagram in maintenance current control module of the present invention;
Figure 10 is the concrete initial judge module workflow of the second oil spout schematic diagram in maintenance current control module of the present invention;
Figure 11 is the concrete maintenance currrent feedback checking module workflow schematic diagram in maintenance current control module of the present invention.
Embodiment
As shown in Figure 1, the driving current of fuel injector magnetic system is a kind of boot last structure.The working procedure of fuel injector magnetic system is divided into two stages, is respectively the open stage of fuel injector magnetic system and the maintenance stage of fuel injector magnetic system.In the open stage of solenoid valve, the driving current of solenoid valve is called firing current; Firing current is very large, and the solenoid valve that is beneficial to oil sprayer is opened rapidly, and firing current should remain on a constant value, avoids fuel injector magnetic system to have shake in the process of opening, thereby avoids causing that fuel injection quantity changes.In order to make firing current remain on a constant value, the control that need to the driving voltage of solenoid valve constantly be opened and be closed.In the maintenance stage of solenoid valve, the driving current of solenoid valve is called maintenance electric current; Keep electric current to be less than firing current, with the large electric current of avoiding continuing, fuel injector magnetic system is burnt out, keep electric current also should remain on a constant value, avoid fuel injector magnetic system to have in the course of the work shake, thereby avoid causing the variation of fuel injection quantity.In order to make to keep electric current to remain on a constant value, also need the control that the driving voltage of solenoid valve is constantly opened and closed.
Use of the present invention eTPU unit carries out the system of oil sprayer Current Waveform Control, comprises oil sprayer current waveform control system in eTPU unit, and this system comprises firing current control module and keeps current control module;
Firing current control module is for when fuel injector magnetic system is started working, the threshold value that the firing current feedback input signal of regularly just being inputted by the firing current feed back input passage of eTPU unit and fuel injector magnetic system are opened chopper current compares, and according to comparative result the copped wave control signal of two driving voltages of the output of the copped wave control channel by eTPU unit, control respectively the switching tube of two driving voltages of fuel injector magnetic system, make the driving current of fuel injector magnetic system remain on predetermined firing current left and right;
Keep current control module for after the opening time of described fuel injector magnetic system finishes, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input by eTPU unit and fuel injector magnetic system, and export compared with the copped wave control signal of low driving voltage by the copped wave control channel of eTPU unit according to comparative result, control in two driving voltages of fuel injector magnetic system compared with the switching tube of low driving voltage, make the driving current of fuel injector magnetic system remain on the predetermined electric current left and right that keeps.
In an instantiation (seeing Fig. 2), predetermined firing current is 18A (ampere), maintenance electric current is 12A (ampere), therefore the firing current feedback input signal of inputting from the feedback signal input channel of eTPU unit is 18A feedback input signal, keeping currrent feedback input signal is 12A feedback input signal, the threshold value that fuel injector magnetic system is opened chopper current is 18A, and it is 12A that fuel injector magnetic system keeps the threshold value of chopper current.The driving voltage of fuel injector magnetic system is made as respectively two kinds of 48V and 12V, the high pressure copped wave control signal of exporting from the copped wave control channel of eTPU unit is 48V copped wave control signal, low pressure copped wave control signal is 12V copped wave control signal, controls the switching tube of corresponding driving voltage.In an instantiation, input signal and output signal are all that eTPU unit through Freescale MPC563X single-chip microcomputer carries out processing control.
Concrete workflow is: when fuel injector magnetic system is started working, the height of the 18A currrent feedback input channel regular check firing current feedback input signal level of eTPU unit, when if incoming signal level being detected and reaching fuel injector magnetic system and open the threshold value of chopper current, 48V copped wave control channel and 12V copped wave control channel by eTPU unit can be exported 48V copped wave control signal and 12V copped wave control signal, control corresponding switching tube (can be metal-oxide-semiconductor or triode), make its cut-off, thereby the driving current of control fuel injector magnetic system can upper punch.When if incoming signal level being detected and not reaching the threshold value of fuel injector magnetic system chopper current, the 48V copped wave control channel of eTPU unit and 12V copped wave control channel can be controlled corresponding metal-oxide-semiconductor, make its conducting, thereby the driving current of control solenoid valve can undershoot.After above-mentioned action, can make fuel injector magnetic system driving current constant remain on 18 amperes of left and right, thereby be conducive to the rapid unlatching of fuel injector magnetic system, again can be due to the excessive solenoid valve that damages of fuel injector magnetic system driving current.
After the opening time of fuel injector magnetic system finishes, forbid detecting the level of 18A currrent feedback input channel, then detect the level of 12A currrent feedback input channel, the operating current of controlling fuel injector magnetic system remains on a constant value.The height of the 12A currrent feedback input channel meeting regular check currrent feedback incoming signal level of eTPU unit, when if incoming signal level being detected and reaching fuel injector magnetic system and keep the threshold value of chopper current, the 12V copped wave control channel of eTPU unit can be exported 12V copped wave control signal, control the switching tube (metal-oxide-semiconductor) of respective drive voltage, make its cut-off, thereby the driving current of control fuel injector magnetic system can upper punch.When if incoming signal level being detected and not reaching the threshold value of fuel injector magnetic system chopper current, the 12V copped wave control channel of eTPU unit can be exported 12V copped wave control signal, control the switching tube (metal-oxide-semiconductor) of respective drive voltage, make its conducting, thereby the driving current of control solenoid valve can undershoot.
The schematic block diagram of the firing current control module in Fig. 3, this module is used eTPU unit controls firing current waveform.This module comprises initialization module, for eTPU passage (being mainly feedback signal input channel and copped wave control channel) being carried out to initialization according to the service call of CPU; The initial judge module of the first oil spout, for the chaining service request sending according to the 18A feed back input passage to eTPU unit, judges the working state of oil sprayer; Firing current feedback checking module, be used for according to the output signal of the initial judge module of described the first oil spout, the threshold value of 18A currrent feedback input signal and described fuel injector magnetic system chopper current is compared, and according to comparative result output 48V copped wave control signal and 12V copped wave control signal; Firing current control to finish module, for according to the output signal of the initial judge module of described the first oil spout (specifically can be B timer the match is successful signal), finishes flash copped wave process.The workflow of a concrete firing current control module: the certain operations pattern of the main initialization eTPU of initialization module passage and some parameters of copped wave.After initialization completes, this eTPU passage is just in idle condition.When this eTPU passage has the chaining service request from other passage of eTPU, will judge that current is fuel injection beginning or end of injection, if fuel injection beginning, some parameters relevant to Current Waveform Control and lasting time of firing current can be set, as A timer and the B timer in eTPU unit be set, output A timer the match is successful signal or B timer the match is successful signal, the described A of setting timer is used to specify the detection time of described firing current feedback, and the described B of setting timer is used to specify the retention time of firing current; Described; Described firing current is controlled and is finished module according to described B timer the match is successful signal, finishes flash copped wave process; ; If end of injection is directly closed Chopper driving passage.Firing current feedback checking module, according to A timer the match is successful signal, carries out firing current feedback and checks, checks the level height of feedback current, and according to the level height of feedback current, directly controls Chopper driving signal and move accordingly.When B timer after the match is successful (be B timer the match is successful signal provides), mean that firing current finishes, firing current is controlled and is finished module and will finish flash copped wave process, and 18A current chopping is driven to signal-inhibiting.Chaining service request is wherein generally that the eTPU passage by a low limit sends, and controls the passage of ground connection, and this Grounding forms loop with the 48V copped wave control channel of introducing and 12V copped wave control channel above.
The schematic diagram of the maintenance current control module in Fig. 4, has explained and has used eTPU unit controls to keep the method for current waveform.This module comprises the second initialization module, before starting working in described maintenance current control module, according to the service call of CPU, the passage in eTPU unit is carried out to initialization; The initial judge module of the second oil spout, for judging the working state of oil sprayer according to the chaining service request receiving from the maintenance currrent feedback input channel of eTPU unit; Keep currrent feedback checking module, be used for according to the output signal of the initial judge module of the second oil spout, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input from eTPU unit and described fuel injector magnetic system, and according to comparative result in two driving voltages of the output of the copped wave control channel by eTPU unit compared with the copped wave control signal of low driving voltage, control the switching tube compared with low driving voltage.Specific works flow process is: be first at initialization module, eTPU unit carries out initialization to eTPU passage, be mainly two input feedback passages of eTPU unit, the certain operations pattern of initialization eTPU passage, as sm_st sm_dt 13 kinds of patterns such as em_b_st) and some parameters (as the review time of feedback current, the channel number of output channel etc.) of copped wave.After initialization completes, this eTPU passage is just in idle condition.When have from other passage of eTPU unit chaining service request time, the initial judge module of oil spout is started working, current according to flag bit judgement is fuel injection beginning or end of injection, if fuel injection beginning, some parameters relevant to Current Waveform Control and lasting time of firing current can be set, as A timer etc. is set; If end of injection is directly closed Chopper driving passage.When A timer is after the match is successful, firing current feedback checking module is started working, and checks the level height of feedback current, and according to the level height of feedback current, directly output control Chopper driving signal, controls the switch motion of corresponding driving voltage.The low edge channel that chaining service request is generally by oil spout sends.General title 48V copped wave control channel and 12V copped wave control channel are referred to as high edge channel, then segmentation, and 48V copped wave control channel is flash high-pressure channel, and 12V copped wave control channel is flash low-pressure channel.Low edge channel full name is low limit low-pressure channel, the i.e. ground of power supply.
Below, with reference to the flow chart shown in Fig. 5-Fig. 8, each submodule in firing current control module in Fig. 4 is described in detail.
Flow chart in Fig. 5 is the initialization process process in a concrete firing current control module.This processing procedure completes on firing current feedback channel, specifically can be 18A currrent feedback passage.After receiving CPU service call, initialization starts, and first, in step 101, passage is switched to 18A feed back input passage, then, in step 102, forbids all timing matching tasks and the transition detection task of this passage.The channel pattern using in eTPU unit is set in step 103, the channel pattern of eTPU has a variety of, such as sm_st pattern, sm_dt pattern, em_b_st pattern etc., is in the industry cycle known, and the inlet point of the corresponding eTPU program of different channel patterns is different.In step 104, the manner of execution of this passage motor unit need to be set.For example 1, coupling timer A, after the match is successful, catches timer A.2, coupling timer B, catches timer B after the match is successful.3, coupling timer A, catches timer B after the match is successful.4, coupling timer B, catches timer A after the match is successful.5 coupling timer A, drag down output pin etc. after the match is successful.After the arranging of execution mode, carry out step 105, from dual port RAM, read the retention time of firing current, then this time is set in the register of eTPU unit (specifically can be the B-register in eTPU unit).In step 106 and 107, completed the original state setting of fuel injector magnetic system control signal, the original state of fuel injector magnetic system control signal is set to forbid output in the present embodiment.After completing steps 107, passage is switched to 18A feed back input passage, enable after the scheduling of this passage eTPU program, just complete firing current and controlled initialize process.
Flow chart in Fig. 6 is the processing procedure of the initial judge module of oil spout in a concrete firing current control module.When having outside to send chaining service request (being LSR request) by other eTPU passage to 18A feed back input passage, first can, in step 201, all matchers that moving of this passage be forbidden.Then in step 202, current according to flag bit judgement is fuel injection beginning or end of injection, if end of injection performs step 203, eTPU passage is switched to 48V control channel and 12V copped wave control channel, forbid copped wave PIN pin (being copped wave control channel) output control waveform.If fuel injection beginning performs step 205, by 48V copped wave mark position 1, illustrate that the current 48V of being copped wave starts.In step 206, coupling A-register and coupling B-register are set respectively; A-register is set, and is the detection time that is used to specify feedback current, for example, be set to 10 μ s, and 18A copped wave control channel can go to detect the threshold value whether feedback current reaches control every 10 μ s so; B-register is set, and is the retention time that is used to specify firing current, for example, be set to 200 μ s, and after 200 μ s, the driving current of fuel injector magnetic system can become 12A from 18A so.In step 207, eTPU passage is switched to 48V and 12V copped wave control channel, copped wave PIN pin is enabled, now mean oil spout beginning constantly.In step 209, enable scheduling, allow to carry out task scheduling when prepass.In the end, in a step 210, passage is converted to 18A feed back input passage again.
Flow chart in Fig. 7 is the processing procedure that a concrete firing current feeds back checking module.When A timer is after the match is successful, in step 301, is set the time of A timer coupling, specify the time lag of detection feedback current next time.In step 302, judge whether present 18A feedback level reaches the threshold value of copped wave level.If reach the threshold value of 18A copped wave, in step 303, by the zero clearing of 48V copped wave flag bit.ETPU passage is switched to 48V and 12V copped wave PIN pin in step 304, and in step 305, forbid this two pin output control signals, can control like this electric current and not want upper punch.If do not reach the threshold value of 18A copped wave, need in step 306, judge whether 48V copped wave flag bit is set to 1, if be set to 1, perform step 309, illustrate that now the driving current of fuel injector magnetic system does not once arrive threshold value yet, need to be in step 309, the PIN pin of eTPU unit is switched to 48V and 12V copped wave PIN pin, in step 310,48V and 12V copped wave PIN pin are enabled to output, to accelerate electric current, reach fast the threshold value of 18A.If 48V copped wave flag bit is not set to 1, explanation, with 48V voltage, drive fuel injector magnetic system to finish, use 12V voltage instead and drive fuel injector magnetic system, so in step 307, eTPU passage is switched to 12V copped wave PIN pin, and enable the output of 12V copped wave PIN pin, avoid oil sprayer driving current undershoot excessive.Finally, in step 311 and step 312, eTPU passage is switched to 18A feed back input passage, enable the A coupling timer of this passage.
Flowcharting in Fig. 8 a concrete firing current control the processing procedure that finishes module.When B timer is after the match is successful, 18A firing current is described, and time is up, in step 401, can and detect and all forbid all couplings of 18A feed back input passage.Then in step 402 and step 403, eTPU passage is switched to 48V and 12V Chopper driving PIN pin, forbid the driver output of these two passages; The last 18A feed back input passage that in step 404, the passage of eTPU switched to.
Below with reference to the flow chart shown in Fig. 9-Figure 11, to keeping each submodule of current control module to be described in detail in Fig. 5.
Flowcharting in Fig. 9 the processing procedure of initialization module in a concrete maintenance current control module, this process completes on 12A currrent feedback passage.After receiving CPU service call, initialization starts, and first, in step 501, passage be switched to 12A feed back input passage, then, in step 502, forbids all timing matching tasks and the transition detection task of this passage equally.The channel pattern that eTPU unit is used is set in step 503, and the channel pattern of eTPU unit has a variety of, generally can be made as sm_st pattern, other pattern that can realize this function also can, the inlet point of the corresponding eTPU program of different channel patterns is different.In step 504, the manner of execution of this passage motor unit need to be set; After the arranging of execution mode, just need in step 505, from dual port RAM, read the retention time of firing current, then this time is set in the register of eTPU.In step 506 and 507, eTPU Channel-shifted, to 12V copped wave PIN pin, and is forbidden to the output of 12V copped wave PIN pin.After completing steps 507, eTPU passage is switched to 12A feed back input passage, enable after the scheduling of this passage eTPU program, just completed maintenance Current Control initialize process.
Flowcharting in Figure 10 the processing procedure of the initial judge module of oil spout in a concrete maintenance current control module.When having outside to send chaining service request (being LSR request) by other eTPU passage to 12A feed back input passage, first can, in step 601, all matchers that moving of this passage be forbidden.Then in step 602, current according to flag bit judgement is fuel injection beginning or end of injection, if end of injection performs step 603, eTPU passage is switched to 12V copped wave control channel, forbids copped wave PIN pin output control waveform.If fuel injection beginning performs step 605, the timing of coupling A-register is set; Here the A-register arranging, is to be used to specify the time that firing current keeps, for example, be set to 200 μ s, and 12V Chopper driving passage can go to detect the control threshold value whether feedback current reaches 12A after 200 μ s so; After completing steps 605, in step 606, enable A match registers, make A match registers start to carry out timing.In step 607, eTPU passage is switched to 12A feed back input passage.
Flowcharting in Figure 11 the processing procedure of a concrete maintenance current control module.When A timer is after the match is successful, in step 701, reset the time of A timer coupling, specify the time lag of next time detecting feedback current.In step 702, judge whether present 12A feedback level reaches the threshold value of copped wave level.If reach the threshold value of 12A copped wave, in step 703, eTPU passage is switched to 12V copped wave PIN pin, and in step 704, forbid 12V copped wave control PIN pin output control signal, can control like this electric current and not want upper punch.If do not reach the threshold value of 12A copped wave, need in step 705 and step 706, eTPU passage be switched to 12V copped wave control channel, and enable the output of 12V copped wave control channel, avoid oil sprayer driving current undershoot excessive.Finally, in step 707 and step 708, eTPU passage is switched to 12A feed back input passage, enable the A coupling timer of this passage.Copped wave PIN pin is above copped wave control channel.
In system of the present invention, utilize in same module, the characteristic that its eTPU passage can switch, takes currrent feedback input directly to control the scheme that oil spout drives pin, and the driving current of fuel injector magnetic system is controlled.And traditional way is to carry out oil sprayer driving current feedback by an eTPU passage to detect, after oil sprayer driving current being detected and reaching certain threshold value, can send service chaining request to copped wave control channel, the processor of eTPU, after receiving service chaining request, can be dispatched all requests of eTPU automatically according to priority; When eTPU processor scheduling arrives the program of copped wave control channel, just carry out the control action of electric current.Whole control program moves, and the drive output signal of fuel injector magnetic system Current Control is longer for input signal cycle time response of electromagnetic valve current feedback, and real-time is very poor, is unfavorable for the accurate control of fuel injector magnetic system driving current.And the solution of the present invention is by an eTPU passage, the feedback current of fuel injector magnetic system to be detected, after oil sprayer driving current being detected and reaching certain threshold value, be directly switch to the Chopper driving passage of eTPU, export corresponding waveform, the feedback current of fuel injector magnetic system is controlled; After Chopper driving passage is exported corresponding waveform, the passage of eTPU is switched to electromagnetic valve driving current feedback sense channel, to again feedback current is detected.
Claims (8)
1. a system of using eTPU unit to carry out oil sprayer Current Waveform Control, it is characterized in that: in eTPU unit, comprise oil sprayer current waveform control system, described oil sprayer current waveform control system comprises firing current control module and keeps current control module;
Described firing current control module is for when fuel injector magnetic system is started working, regularly the threshold value of the firing current feedback input signal of the firing current feed back input passage input by eTPU unit and fuel injector magnetic system unlatching chopper current is compared, and according to comparative result the copped wave control signal of two driving voltages of the output of the copped wave control channel by eTPU unit, control respectively the switching tube of two driving voltages of described fuel injector magnetic system, make the driving current of described fuel injector magnetic system remain on predetermined firing current left and right;
Described maintenance current control module is for after the opening time of described fuel injector magnetic system finishes, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input by eTPU unit and fuel injector magnetic system, and export compared with the copped wave control signal of low driving voltage by the copped wave control channel of eTPU unit according to comparative result, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make the driving current of described fuel injector magnetic system remain on the predetermined electric current left and right that keeps,
Described firing current control module comprises initialization module, for eTPU passage being carried out to initialization according to the service call of CPU; The initial judge module of the first oil spout, for the chaining service request sending according to the feed back input passage to eTPU unit, judges the working state of oil sprayer; Firing current feedback checking module, for according to the output signal of the initial judge module of described the first oil spout, compares the threshold value of currrent feedback input signal and described fuel injector magnetic system chopper current, and according to comparative result outpat control signal; Firing current is controlled and is finished module, for according to the output signal of the initial judge module of described the first oil spout, finishes flash copped wave process;
Described maintenance current control module module comprises the second initialization module, before starting working in described maintenance current control module, according to the service call of CPU, the passage in eTPU unit is carried out to initialization; The initial judge module of the second oil spout, for judging the working state of oil sprayer according to the chaining service request receiving from the maintenance currrent feedback input channel of eTPU unit; Keep currrent feedback checking module, be used for according to the output signal of the initial judge module of the second oil spout, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input from eTPU unit and described fuel injector magnetic system, and according to comparative result in two driving voltages of the output of the copped wave control channel by eTPU unit compared with the copped wave control signal of low driving voltage, control the switching tube compared with low driving voltage.
2. the system as claimed in claim 1, is characterized in that:
In described firing current control module, when described firing current feedback input signal level being detected and reach described fuel injector magnetic system and open the threshold value of chopper current, by exporting the copped wave control signal of two driving voltages, control respectively the switching tube of two driving voltages, make its cut-off; If when currrent feedback incoming signal level being detected and not reaching the threshold value of fuel injector magnetic system chopper current, by exporting the copped wave control signal of two driving voltages, control respectively the switching tube of two driving voltages, make its conducting;
In described maintenance current control module, when described maintenance currrent feedback input signal being detected and reach fuel injector magnetic system and keep the threshold value of chopper current, by exporting compared with the copped wave control signal of low driving voltage, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make its cut-off; If detected while keeping currrent feedback input signal not reach the threshold value of fuel injector magnetic system chopper current, by exporting compared with the copped wave control signal of low driving voltage, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make its conducting.
3. system as claimed in claim 1 or 2, is characterized in that:
Described firing current control module comprises:
The first initialization module, before starting working in described firing current control module, carries out initialization according to the service call of CPU to the passage in eTPU unit;
The initial judge module of the first oil spout, for according to receiving chaining service request from the firing current feed back input passage of eTPU unit, judges the working state of oil sprayer;
Firing current feedback checking module, be used for according to the output signal of the initial judge module of described the first oil spout, regularly the threshold value of the firing current feedback input signal of the firing current feed back input passage input from eTPU unit and described fuel injector magnetic system unlatching chopper current is compared, and by the copped wave control channel of eTPU unit, export respectively the copped wave control signal of two driving voltages according to comparative result, control respectively the switching tube of two driving voltages;
Firing current is controlled and is finished module, for according to the output signal of the initial judge module of described the first oil spout, finishes flash copped wave process;
Described maintenance current control module comprises:
The second initialization module, before starting working in described maintenance current control module, carries out initialization according to the service call of CPU to the passage in eTPU unit;
The initial judge module of the second oil spout, for judging the working state of oil sprayer according to the chaining service request receiving from the maintenance currrent feedback input channel of eTPU unit;
Keep currrent feedback checking module, be used for according to the output signal of the initial judge module of described the second oil spout, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input from eTPU unit and described fuel injector magnetic system, and according to comparative result in two driving voltages of the output of the copped wave control channel by eTPU unit compared with the copped wave control signal of low driving voltage, control the switching tube compared with low driving voltage.
4. system as claimed in claim 3, is characterized in that: the initial judge module of described the first oil spout, judges current oil spout state according to flag bit; Fuel injection beginning if, A timer and B timer in eTPU unit are set respectively, output A timer the match is successful signal or B timer the match is successful signal, the described A of setting timer is used to specify the detection time of described firing current feedback, and the described B of setting timer is used to specify the retention time of firing current; Described firing current feedback checking module, according to described A timer the match is successful signal, carries out firing current feedback and checks; Described firing current is controlled and is finished module according to described B timer the match is successful signal, finishes flash copped wave process;
The initial judge module of described the second oil spout, judges current oil spout state according to flag bit; Fuel injection beginning, resets the A timer in eTPU unit if, output A timer the match is successful signal, and the described A of setting timer is used to specify the detection time of described maintenance currrent feedback; Described maintenance is opened currrent feedback checking module according to described A timer the match is successful signal, keeps currrent feedback inspection.
5. use eTPU unit to carry out a method for oil sprayer Current Waveform Control, it is characterized in that: adopt the firing current control module being arranged in eTPU unit to carry out the control of firing current; Described firing current control module is for when fuel injector magnetic system is started working, regularly the threshold value of the firing current feedback input signal of the firing current feed back input passage input by eTPU unit and fuel injector magnetic system unlatching chopper current is compared, and according to comparative result the copped wave control signal of two driving voltages of the output of the copped wave control channel by eTPU unit, control respectively the switching tube of two driving voltages of described fuel injector magnetic system, make the driving current of described fuel injector magnetic system remain on predetermined firing current left and right;
After the opening time finishes, adopt the maintenance current control module being arranged in eTPU unit to keep Current Control, described maintenance current control module is for after the opening time of described fuel injector magnetic system finishes, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input by eTPU unit and fuel injector magnetic system, and export compared with the copped wave control signal of low driving voltage by the copped wave control channel of eTPU unit according to comparative result, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make the driving current of described fuel injector magnetic system remain on the predetermined electric current left and right that keeps,
Described firing current control module comprises initialization module, for eTPU passage being carried out to initialization according to the service call of CPU; The initial judge module of the first oil spout, for the chaining service request sending according to the feed back input passage to eTPU unit, judges the working state of oil sprayer; Firing current feedback checking module, for according to the output signal of the initial judge module of described the first oil spout, compares the threshold value of currrent feedback input signal and described fuel injector magnetic system chopper current, and according to comparative result outpat control signal; Firing current is controlled and is finished module, for according to the output signal of the initial judge module of described the first oil spout, finishes flash copped wave process;
Described maintenance current control module module comprises the second initialization module, before starting working in described maintenance current control module, according to the service call of CPU, the passage in eTPU unit is carried out to initialization; The initial judge module of the second oil spout, for judging the working state of oil sprayer according to the chaining service request receiving from the maintenance currrent feedback input channel of eTPU unit; Keep currrent feedback checking module, be used for according to the output signal of the initial judge module of the second oil spout, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input from eTPU unit and described fuel injector magnetic system, and according to comparative result in two driving voltages of the output of the copped wave control channel by eTPU unit compared with the copped wave control signal of low driving voltage, control the switching tube compared with low driving voltage.
6. method as claimed in claim 5, is characterized in that:
In described firing current control module, when described firing current feedback input signal level being detected and reach described fuel injector magnetic system and open the threshold value of chopper current, by exporting the copped wave control signal of two driving voltages, control respectively the switching tube of two driving voltages, make its cut-off; If when currrent feedback incoming signal level being detected and not reaching the threshold value of fuel injector magnetic system chopper current, by exporting the copped wave control signal of two driving voltages, control respectively the switching tube of two driving voltages, make its conducting;
In described maintenance current control module, when described maintenance currrent feedback input signal being detected and reach fuel injector magnetic system and keep the threshold value of chopper current, by exporting compared with the copped wave control signal of low driving voltage, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make its cut-off; If detected while keeping currrent feedback input signal not reach the threshold value of fuel injector magnetic system chopper current, by exporting compared with the copped wave control signal of low driving voltage, control in two driving voltages of described fuel injector magnetic system compared with the switching tube of low driving voltage, make its conducting.
7. the method as described in claim 5 or 6, is characterized in that:
Described firing current control module comprises:
The first initialization module, before starting working in described firing current control module, carries out initialization according to the service call of CPU to the passage in eTPU unit;
The initial judge module of the first oil spout, for according to receiving chaining service request from the firing current feed back input passage of eTPU unit, judges the working state of oil sprayer;
Firing current feedback checking module, be used for according to the output signal of the initial judge module of described the first oil spout, regularly the threshold value of the firing current feedback input signal of the firing current feed back input passage input by eTPU unit and described fuel injector magnetic system unlatching chopper current is compared, and according to comparative result, by the copped wave control channel of eTPU unit, export respectively the copped wave control signal of two driving voltages, control respectively the switching tube of two driving voltages;
Firing current is controlled and is finished module, for according to the output signal of the initial judge module of described the first oil spout, finishes flash copped wave process.
Described maintenance current control module comprises:
The second initialization module, before starting working in described maintenance current control module, carries out initialization according to the service call of CPU to the passage in eTPU unit;
The initial judge module of the second oil spout, for judging the working state of oil sprayer according to the chaining service request receiving from the maintenance currrent feedback input channel of eTPU unit;
Keep currrent feedback checking module, be used for according to the output signal of the initial judge module of described the second oil spout, regularly keep the threshold value of chopper current to compare the maintenance currrent feedback input signal of the maintenance currrent feedback input channel input by eTPU unit and described fuel injector magnetic system, and according to comparative result in two driving voltages of the output of the copped wave control channel by eTPU unit compared with the copped wave control signal of low driving voltage, control the switching tube compared with low driving voltage.
8. method as claimed in claim 7, is characterized in that: the initial judge module of described the first oil spout, judges current oil spout state according to flag bit; Fuel injection beginning if, A timer and B timer in eTPU unit are set respectively, output A timer the match is successful signal or B timer the match is successful signal, the described A of setting timer is used to specify the detection time of described firing current feedback, and the described B of setting timer is used to specify the retention time of firing current; Described firing current feedback checking module, according to described A timer the match is successful signal, carries out firing current feedback and checks; Described firing current is controlled and is finished module according to described B timer the match is successful signal, finishes flash copped wave process;
The initial judge module of described the second oil spout, judges current oil spout state according to flag bit; Fuel injection beginning, resets the A timer in eTPU unit if, output A timer the match is successful signal, and the described A of setting timer is used to specify the retention time of described maintenance electric current; Described maintenance is opened currrent feedback checking module according to described A timer the match is successful signal, keeps currrent feedback inspection.
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| JP5768800B2 (en) * | 2012-11-05 | 2015-08-26 | 株式会社デンソー | Fuel injection device |
| CN109779806B (en) * | 2019-02-01 | 2021-01-15 | 中国第一汽车股份有限公司 | Oil injector analog load driving current waveform adjusting system and adjusting method |
| US11230990B2 (en) | 2019-11-11 | 2022-01-25 | Caterpillar Inc. | Method and system for valve movement detection |
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