CN102536566A - 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 adopts accurate more oil sprayer driving current imperative in order to improve its Economy and to improve its emission performance.The driving current of fuel injector magnetic system is divided into 2 stages, is respectively open stage and maintenance stage (see figure 1).Open stage is with big electric current solenoid valve to be opened fast, and the firing current of fuel injector magnetic system should remain in the constant scope; The maintenance stage is the aperture that keeps solenoid valve with less current, and the maintenance electric current of fuel injector magnetic system also should remain within the constant scope.
In order to realize the boot last structure of electromagnetic valve driving current, abroad some companies mainly use special chip, adopt the method for hardware copped wave, constantly driving voltage are carried out conducting and closure according to feedback current.For example, Robert Bosch Co., Ltd uses the special chip 30520 of Bosch, and it realizes above-mentioned waveform for the mode that adopts hardware copped wave, 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 that the present invention will solve provides the system that a kind of eTPU of use unit carries out the oil sprayer Current Waveform Control, and it adopts the eTPU unit to realize the control of oil sprayer current waveform.
For solving the problems of the technologies described above; Use eTPU of the present invention carries out the unit system of oil sprayer Current Waveform Control; For in the eTPU unit, comprising the oil sprayer current waveform control system, said oil sprayer current waveform control system comprises the firing current control module and keeps current control module;
Said firing current control module is used for when fuel injector magnetic system is started working; Regularly will be fed back the firing current feedback input signal of input channel input and the threshold value of fuel injector magnetic system unlatching chopper current by the firing current of eTPU unit compares; And according to the copped wave control signal of comparative result through two driving voltages of copped wave control channel output of eTPU unit; Control the switching tube of two driving voltages of said fuel injector magnetic system respectively, the driving current of said fuel injector magnetic system is remained on about predetermined firing current;
Said maintenance current control module is used for after the opening time of said fuel injector magnetic system finishes; Regularly will keep the threshold value of chopper current to compare by maintenance currrent feedback input signal and the fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according to the copped wave control signal of the copped wave control channel output of comparative result through the eTPU unit than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, make the driving current of said fuel injector magnetic system remain on predetermined the maintenance about electric current.
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 that is arranged in the eTPU unit to carry out the control of firing current; Said firing current control module is used for when fuel injector magnetic system is started working; Regularly will be fed back the firing current feedback input signal of input channel input and the threshold value of fuel injector magnetic system unlatching chopper current by the firing current of eTPU unit compares; And according to the copped wave control signal of comparative result through two driving voltages of copped wave control channel output of eTPU unit; Control the switching tube of two driving voltages of said fuel injector magnetic system respectively, the driving current of said fuel injector magnetic system is remained on about predetermined firing current;
After the opening time finishes, adopt the maintenance current control module that is arranged in the eTPU unit to keep Current Control; Said maintenance current control module is used for after the opening time of said fuel injector magnetic system finishes; Regularly will keep the threshold value of chopper current to compare by maintenance currrent feedback input signal and the fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according to the copped wave control signal of the copped wave control channel output of comparative result through the eTPU unit than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, make the driving current of said fuel injector magnetic system remain on predetermined the maintenance about electric current.
The present invention is to use the eTPU unit to carry out the system of oil sprayer Current Waveform Control; Adopt the eTPU unit to realize the control of current waveform; Not only can save the cost of hardware circuit greatly, can also break the technology barriers that overseas enterprise monopolizes own special chip.The present invention simultaneously also is utilized in the same eTPU program, and the technology that the eTPU passage switches is each other improved the Current Control program.Scheduling time owing to having saved eTPU makes that the response of fuel injector magnetic system current drive signal is rapider, and is not only more accurate to the oil sprayer Current Waveform Control, also improved the operational efficiency and the stability of software.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the driving current schematic representation of the fuel injector magnetic system of boot last structure;
Fig. 2 is a 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 representation in the firing current control module of the present invention;
Fig. 6 is the concrete initial judge module workflow of first oil spout schematic representation in the firing current control module of the present invention;
Fig. 7 is that the concrete firing current feedback in the firing current control module of the present invention is checked module workflow schematic representation;
Fig. 8 is that the concrete firing current control in the firing current control module of the present invention finishes module workflow schematic representation;
Fig. 9 is the concrete second initialization module workflow schematic representation in the maintenance current control module of the present invention;
Figure 10 is the concrete initial judge module workflow of second oil spout schematic representation in the maintenance current control module of the present invention;
Figure 11 is that the concrete maintenance currrent feedback in the maintenance current control module of the present invention is checked module workflow schematic representation.
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 big, 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 in the process of opening, shake to be arranged, thereby avoids causing that fuel injection quantity changes.In order to make firing current remain on a constant value, the control that need constantly open and close the driving voltage of solenoid valve.In the maintenance stage of solenoid valve, the driving current of solenoid valve is called the maintenance electric current; Keep electric current less than firing current, fuel injector magnetic system is burnt out, keep electric current also should remain on a constant value, avoid fuel injector magnetic system that shake is arranged in the course of the work, thereby avoid causing the variation of fuel injection quantity with the big electric current of avoiding continuing.Keep electric current to remain on a constant value in order to make, the control that also need constantly open and close the driving voltage of solenoid valve.
Use eTPU of the present invention carries out the unit system of oil sprayer Current Waveform Control, in the eTPU unit, comprises the oil sprayer current waveform control system, and this system comprises the firing current control module and keeps current control module;
The firing current control module is used for when fuel injector magnetic system is started working; Regularly just compare by the firing current feedback input signal of the firing current feedback input channel input of eTPU unit threshold value with fuel injector magnetic system unlatching chopper current; And according to the copped wave control signal of comparative result through two driving voltages of copped wave control channel output of eTPU unit; Control the switching tube of two driving voltages of fuel injector magnetic system respectively, the driving current of fuel injector magnetic system is remained on about predetermined firing current;
Keep current control module to be used for after the opening time of said fuel injector magnetic system finishes; Regularly will keep the threshold value of chopper current to compare by maintenance currrent feedback input signal and the fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according to the copped wave control signal of the copped wave control channel output of comparative result through the eTPU unit than low driving voltage; Control in two driving voltages of fuel injector magnetic system than the switching tube of low driving voltage, make the driving current of fuel injector magnetic system remain on predetermined the maintenance about electric current.
(see figure 2) in an instantiation; Predetermined firing current is 18A (ampere); The maintenance electric current is 12A (ampere), and the firing current feedback input signal of therefore importing from the feedback signal input channel of eTPU unit is the 18A feedback input signal, and keeping the currrent feedback input signal is the 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 two kinds of 48V and 12V respectively; The high pressure copped wave control signal of exporting from the copped wave control channel of eTPU unit is a 48V copped wave control signal; Low pressure copped wave control signal is a 12V copped wave control signal, controls the switching tube of corresponding driving voltage.Input signal all is that the eTPU unit that passes through Freescale MPC563X single-chip microcomputer carries out processing control with the output signal in the instantiation.
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; If when detecting incoming signal level 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 through the 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), it ended, thus control fuel injector magnetic system driving current not can on dash.If when detecting incoming signal level 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 M OS pipe; Make its conducting, thereby the driving current of control electromagnetic valve can not dash down.Through after the above-mentioned action, can make the remaining on about 18 amperes of driving current constant of fuel injector magnetic system, thereby help the rapid unlatching of fuel injector magnetic system, again can be owing 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 control 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; If when detecting incoming signal level 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; The switching tube (metal-oxide-semiconductor) of control respective drive voltage ends it, thus the driving current of control fuel injector magnetic system not can on dash.If when detecting incoming signal level 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; The switching tube (metal-oxide-semiconductor) of control respective drive voltage make its conducting, thereby the driving current of control electromagnetic valve can not dash down.
The schematic block diagram of the firing current control module among Fig. 3, this module use eTPU unit controls firing current waveform.This module comprises initialization module, is used for according to the service call of CPU eTPU passage (being mainly feedback signal input channel and copped wave control channel) being carried out initialization; The initial judge module of first oil spout is used for judging the working state of oil sprayer according to the chaining service request to the transmission of the 18A of eTPU unit feedback input channel; Firing current feedback inspection module; Be used for output signal according to the initial judge module of said first oil spout; The threshold value of 18A currrent feedback input signal and said 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 finishes module, is used for the output signal (specifically can be the B timer and be matched to function signal) according to the initial judge module of said first oil spout, 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 was accomplished, this eTPU passage just was 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; The time that some parameters relevant with Current Waveform Control and firing current continue then can be set, as A timer and the B timer in the eTPU unit is set, output A timer is matched to function signal or the B timer is matched to function signal; The said A of setting timer is used to specify the detection time of said firing current feedback, and the said B of setting timer is used to specify the retention time of firing current; Said; Said firing current control finishes module and is matched to function signal according to said B timer, finishes flash copped wave process; If end of injection is then directly closed the copped wave drive channels.Firing current feedback inspection module is matched to function signal according to the A timer, carries out the inspection of firing current feedback, the level height of inspection feedback current, and according to the level height of feedback current, directly control the copped wave drive signal and carry out corresponding action.After the B timer matees successfully (be B timer be matched to function signal provide), mean that firing current finishes, firing current control finishes module will finish flash copped wave process, and 18A current chopping drive signal is forbidden.Chaining service request wherein generally is that the eTPU passage by a low limit sends, and promptly controls the passage of ground connection, 48V copped wave control channel that this ground connection passage and front are introduced and 12V copped wave control channel formation loop.
The schematic representation of the maintenance current control module among Fig. 4 has been explained and has been used the eTPU unit controls to keep the method for current waveform.This module comprises second initialization module, is used for before said maintenance current control module is started working, according to the service call of CPU the passage in the eTPU unit being carried out initialization; The initial judge module of second oil spout is used for judging according to the chaining service request that receives from the maintenance currrent feedback input channel of eTPU unit the working state of oil sprayer; Keep currrent feedback inspection module; Be used for output signal according to the initial judge module of second oil spout; Regularly will keep the threshold value of chopper current to compare from maintenance currrent feedback input signal and the said fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according in comparative result two driving voltages of copped wave control channel output through the eTPU unit than the copped wave control signal of low driving voltage, control switching tube than low driving voltage.Concrete workflow is: at first be at initialization module; The eTPU unit carries out initialization to the eTPU passage; Be mainly two input feedback channels of eTPU unit; The certain operations pattern of initialization eTPU passage, as sm_dt etc. 13 kinds of patterns) and some parameters (like the review time of feedback current, the channel number of output channel etc.) of copped wave.After initialization was accomplished, this eTPU passage just was in idle condition.As from the chaining service request of other passage of eTPU unit the time; The initial judge module of oil spout is started working; Judge that according to flag bit current is fuel injection beginning or end of injection; If fuel injection beginning then can be provided with the time that some parameters relevant with Current Waveform Control and firing current continue, as A timer etc. is set; If end of injection is then directly closed the copped wave drive channels.After the A timer mated successfully, firing current feedback inspection module was started working, and checked the level height of feedback current, and according to the level height of feedback current, directly output control copped wave drive signal is controlled the switch motion of corresponding driving voltage.The low edge channel that the chaining service request is generally by oil spout sends.General 48V copped wave control channel and the 12V copped wave control channel claimed is referred to as high edge channel, segmentation again, and 48V copped wave control channel is the flash high-pressure channel, and 12V copped wave control channel is the flash low-pressure channel.Low edge channel full name is low limit low-pressure channel, the i.e. ground of power supply.
Below, will each submodule in the firing current control module among Fig. 4 be described in detail with reference to Fig. 5-flow chart shown in Figure 8.
Flow chart among Fig. 5 is the initialization process process in the concrete firing current control module.This processing procedure is accomplished on the firing current feedback channel, specifically can be 18A currrent feedback passage.After receiving the CPU service call, initialization begins, and at first in step 101, passage is switched to 18A feedback input channel, and then in step 102, all of forbidding this passage are regularly mated task and transition detection task.The channel pattern that uses in the eTPU unit is set in step 103; The channel pattern of eTPU has a variety of; For example sm_st pattern, sm_dt pattern, em_b_st pattern etc. in the industry cycle are known, and the inlet point of the pairing eTPU program of different channel patterns is different.In step 104, the manner of execution of this passage motor unit need be set.For example 1, coupling timer A, mate the successfully later timer A that catches.2, coupling timer B catches timer B after mating successfully.3, coupling timer A catches timer B after mating successfully.4, coupling timer B catches timer A after mating successfully.5 coupling timer A drag down output pin or the like after mating successfully.After being provided with 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 the eTPU unit).In step 106 and 107, accomplished 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 feedback input channel, enable the scheduling of this passage eTPU program after, just accomplished firing current control initialize process.
Flow chart among Fig. 6 is the processing procedure of the initial judge module of oil spout in the concrete firing current control module.As the outside through other eTPU passage when 18A feedback input channel is sent chaining service request (being the LSR request), at first can in step 201, all matchers that moving of this passage be forbidden.Then in step 202; Judging current according to flag bit is fuel injection beginning or end of injection, if end of injection, execution in step 203; The 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, execution in step 205 with 48V copped wave mark position 1, explains that the current 48V of being copped wave begins.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 is set to 10 μ s, and 18A copped wave control channel can whenever go to detect the threshold value whether feedback current reaches control at a distance from 10 μ s so; B-register is set, and is the retention time that is used to specify firing current, for example is set to 200 μ s, and the driving current of fuel injector magnetic system can become 12A by 18A after the 200 μ s so.In step 207, the eTPU passage is switched to 48V and 12V copped wave control channel, copped wave PIN pin is enabled, mean oil spout beginning constantly this moment.In step 209, enable scheduling, allow to carry out task scheduling when prepass.In the step 210 in the end, passage is converted to 18A feedback input channel again.
Flow chart among Fig. 7 is the processing procedure that a concrete firing current feedback is checked module.After the A timer matees successfully, in step 301, is set the time of A timer coupling, specify the time lag of detection feedback current next time.Judge in step 302 whether present 18A feedback levels reaches the threshold value of copped wave level.If reach the threshold value of 18A copped wave, in step 303, with the zero clearing of 48V copped wave flag bit.In step 304, the eTPU passage is switched to 48V and 12V copped wave PIN pin, and in step 305, forbid this two pins output control signals, can control electric current like this and dash on not.If do not reach the threshold value of 18A copped wave, need judge in step 306 then whether 48V copped wave flag bit is put 1, if put 1; Then execution in step 309, explain that the driving current of fuel injector magnetic system this moment does not once arrive threshold value yet, need 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 output, to accelerate the threshold value that electric current reaches 18A fast.If 48V copped wave flag bit is not put 1; Then explanation finishes with 48V driven fuel injector magnetic system, uses 12V driven fuel injector magnetic system instead; So in step 307; The eTPU passage is switched to 12V copped wave PIN pin, and enable the output of 12V copped wave PIN pin, avoid breaking through under the oil sprayer driving current big.In step 311 and step 312, the eTPU passage is switched to 18A feedback input channel at last, enable the A coupling timer of this passage.
Flowcharting among Fig. 8 concrete firing current control finish the processing procedure of module.After the B timer mated successfully, the 18A firing current is described, and time is up, in step 401, can 18A fed back all couplings of input channel and detects and to forbid.In step 402 and step 403, the eTPU passage is switched to 48V and 12V copped wave driving PIN pin then, forbid the driving output of these two passages; Last in step 404, the passage of eTPU is switched to 18A feedback input channel.
To be described in detail keeping each submodule of current control module among Fig. 5 with reference to Fig. 9-flow chart shown in Figure 11 below.
Flowcharting among Fig. 9 the processing procedure of the initialization module in concrete maintenance current control module, this process is accomplished on 12A currrent feedback passage.After receiving the CPU service call, initialization begins equally, at first in step 501, passage is switched to 12A feedback input channel, and then in step 502, all of forbidding this passage are regularly mated task and transition detection task.The channel pattern that the eTPU unit uses is set in step 503, and the channel pattern of eTPU unit has a variety of, generally can be made as the sm_st pattern, other pattern that can realize this function also can, the inlet point of the pairing eTPU program of different channel patterns is different.In step 504, the manner of execution of this passage motor unit need be set; After being provided with 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, the eTPU passage is converted to 12V copped wave PIN pin, and forbids the output of 12V copped wave PIN pin.After completing steps 507, the eTPU passage is switched to 12A feedback input channel, enable the scheduling of this passage eTPU program after, just accomplished maintenance Current Control initialize process.
Flowcharting among Figure 10 the processing procedure of the initial judge module of oil spout in concrete maintenance current control module.As the outside through other eTPU passage when 12A feedback input channel is sent chaining service request (being the LSR request), at first can in step 601, all matchers that moving of this passage be forbidden.In step 602, judging current according to flag bit is fuel injection beginning or end of injection then, if end of injection, execution in step 603 switches to 12V copped wave control channel with the eTPU passage, forbids copped wave PIN pin output control waveform.If fuel injection beginning, execution in step 605 is provided with the timing that matees A-register; Here the A-register that is provided with is the time that is used to specify the firing current maintenance, for example is set to 200 μ s, and 12V copped wave drive channels can go to detect the control threshold value whether feedback current reaches 12A later at 200 μ s so; Behind completing steps 605, in step 606, enable the A match registers, make the A match registers begin to carry out timing.In step 607, the eTPU passage is switched to 12A feedback input channel.
Flowcharting among Figure 11 the processing procedure of a concrete maintenance current control module.After the A timer matees successfully, in step 701, reset the time of A timer coupling, specify the time lag of next time detecting feedback current.Judge in step 702 whether present 12A feedback levels reaches the threshold value of copped wave level.If reach the threshold value of 12A copped wave, in step 703, the 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 electric current like this and dash on not.If do not reach the threshold value of 12A copped wave, then need in step 705 and step 706, the eTPU passage be switched to 12V copped wave control channel, and enable the output of 12V copped wave control channel, avoid breaking through under the oil sprayer driving current big.In step 707 and step 708, the eTPU passage is switched to 12A feedback input channel at last, enable the A coupling timer of this passage.Top copped wave PIN pin is copped wave control channel.
In the system of the present invention, be utilized in the same module, the characteristic that its eTPU passage can switch is taked the directly scheme of control oil spout driving pin of currrent feedback input, and the driving current of fuel injector magnetic system is controlled.And traditional way is to carry out oil sprayer driving current detection feedback by an eTPU passage; After detecting the oil sprayer driving current and reaching certain threshold value; Can send the service chaining request to copped wave control channel; The processor of eTPU can be dispatched all requests of eTPU according to priority after receiving the service chaining request automatically; When the eTPU processor scheduling arrives the program of copped wave control channel, just carry out the control action of electric current.The The whole control program running is got off, 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 scheme of the present invention is to be detected by the feedback current of an eTPU passage to fuel injector magnetic system; After detecting the oil sprayer driving current and reaching certain threshold value; Be directly switch to the copped wave drive channels of eTPU; Export corresponding waveform, the feedback current of fuel injector magnetic system is controlled; After the copped wave drive channels is exported corresponding waveform, the passage of eTPU is switched to electromagnetic valve driving current detection feedback passage, so that once more feedback current is detected.
Claims (8)
1. system that uses the eTPU unit to carry out the oil sprayer Current Waveform Control; It is characterized in that: in the eTPU unit, comprise the oil sprayer current waveform control system, said oil sprayer current waveform control system comprises the firing current control module and keeps current control module;
Said firing current control module is used for when fuel injector magnetic system is started working; Regularly will be fed back the firing current feedback input signal of input channel input and the threshold value of fuel injector magnetic system unlatching chopper current by the firing current of eTPU unit compares; And according to the copped wave control signal of comparative result through two driving voltages of copped wave control channel output of eTPU unit; Control the switching tube of two driving voltages of said fuel injector magnetic system respectively, the driving current of said fuel injector magnetic system is remained on about predetermined firing current;
Said maintenance current control module is used for after the opening time of said fuel injector magnetic system finishes; Regularly will keep the threshold value of chopper current to compare by maintenance currrent feedback input signal and the fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according to the copped wave control signal of the copped wave control channel output of comparative result through the eTPU unit than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, make the driving current of said fuel injector magnetic system remain on predetermined the maintenance about electric current.
2. the system of claim 1 is characterized in that:
In said firing current control module; When detecting said firing current feedback input signal level and reach said fuel injector magnetic system and open the threshold value of chopper current; Through exporting the copped wave control signal of two driving voltages, control the switching tube of two driving voltages respectively, it is ended; If when detecting the currrent feedback incoming signal level and not reaching the threshold value of fuel injector magnetic system chopper current,, control the switching tube of two driving voltages respectively, make its conducting through exporting the copped wave control signal of two driving voltages;
In said maintenance current control module; When detecting said maintenance currrent feedback input signal and reach fuel injector magnetic system and keep the threshold value of chopper current; Through the copped wave control signal of output than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, it is ended; If detect when keeping the currrent feedback input signal not reach the threshold value of fuel injector magnetic system chopper current; Through the copped wave control signal of output than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, make its conducting.
3. according to claim 1 or claim 2 system is characterized in that:
Said firing current control module comprises:
First initialization module is used for before said firing current control module is started working, according to the service call of CPU the passage in the eTPU unit being carried out initialization;
The initial judge module of first oil spout is used for receiving the chaining service request according to the firing current feedback input channel from the eTPU unit, judges the working state of oil sprayer;
Firing current feedback inspection module; Be used for output signal according to the initial judge module of said first oil spout; Regularly will feed back the firing current feedback input signal of input channel input and the threshold value of said fuel injector magnetic system unlatching chopper current from the firing current of eTPU unit compares; And according to comparative result the copped wave control signal of two driving voltages of the output of the copped wave control channel through the eTPU unit respectively, control the switching tube of two driving voltages respectively;
Firing current control finishes module, is used for the output signal according to the initial judge module of said first oil spout, finishes flash copped wave process;
Said maintenance current control module comprises:
Second initialization module is used for before said maintenance current control module is started working, according to the service call of CPU the passage in the eTPU unit being carried out initialization;
The initial judge module of second oil spout is used for judging according to the chaining service request that receives from the maintenance currrent feedback input channel of eTPU unit the working state of oil sprayer;
Keep currrent feedback inspection module; Be used for output signal according to the initial judge module of said second oil spout; Regularly will keep the threshold value of chopper current to compare from maintenance currrent feedback input signal and the said fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according in comparative result two driving voltages of copped wave control channel output through the eTPU unit than the copped wave control signal of low driving voltage, control switching tube than low driving voltage.
4. system as claimed in claim 3 is characterized in that: the initial judge module of said first oil spout, judge current oil spout state according to flag bit; If be fuel injection beginning; A timer and B timer in the eTPU unit then are set respectively; Output A timer is matched to function signal or the B timer is matched to function signal; The said A of setting timer is used to specify the detection time of said firing current feedback, and the said B of setting timer is used to specify the retention time of firing current; Said firing current feedback inspection module is matched to function signal according to said A timer, carries out the inspection of firing current feedback; Said firing current control finishes module and is matched to function signal according to said B timer, finishes flash copped wave process;
The initial judge module of said second oil spout is judged current oil spout state according to flag bit; If be fuel injection beginning, then reset the A timer in the eTPU unit, output A timer is matched to function signal, and the said A of setting timer is used to specify the detection time of said maintenance currrent feedback; Said maintenance is opened currrent feedback inspection module and is matched to function signal according to said A timer, keeps the currrent feedback inspection.
5. a method of using the eTPU unit to carry out the oil sprayer Current Waveform Control is characterized in that: adopt the firing current control module that is arranged in the eTPU unit to carry out the control of firing current; Said firing current control module is used for when fuel injector magnetic system is started working; Regularly will be fed back the firing current feedback input signal of input channel input and the threshold value of fuel injector magnetic system unlatching chopper current by the firing current of eTPU unit compares; And according to the copped wave control signal of comparative result through two driving voltages of copped wave control channel output of eTPU unit; Control the switching tube of two driving voltages of said fuel injector magnetic system respectively, the driving current of said fuel injector magnetic system is remained on about predetermined firing current;
After the opening time finishes, adopt the maintenance current control module that is arranged in the eTPU unit to keep Current Control; Said maintenance current control module is used for after the opening time of said fuel injector magnetic system finishes; Regularly will keep the threshold value of chopper current to compare by maintenance currrent feedback input signal and the fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according to the copped wave control signal of the copped wave control channel output of comparative result through the eTPU unit than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, make the driving current of said fuel injector magnetic system remain on predetermined the maintenance about electric current.
6. method as claimed in claim 5 is characterized in that:
In said firing current control module; When detecting said firing current feedback input signal level and reach said fuel injector magnetic system and open the threshold value of chopper current; Through exporting the copped wave control signal of two driving voltages, control the switching tube of two driving voltages respectively, it is ended; If when detecting the currrent feedback incoming signal level and not reaching the threshold value of fuel injector magnetic system chopper current,, control the switching tube of two driving voltages respectively, make its conducting through exporting the copped wave control signal of two driving voltages;
In said maintenance current control module; When detecting said maintenance currrent feedback input signal and reach fuel injector magnetic system and keep the threshold value of chopper current; Through the copped wave control signal of output than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, it is ended; If detect when keeping the currrent feedback input signal not reach the threshold value of fuel injector magnetic system chopper current; Through the copped wave control signal of output than low driving voltage; Control in two driving voltages of said fuel injector magnetic system than the switching tube of low driving voltage, make its conducting.
7. like claim 5 or 6 described methods, it is characterized in that:
Said firing current control module comprises:
First initialization module is used for before said firing current control module is started working, according to the service call of CPU the passage in the eTPU unit being carried out initialization;
The initial judge module of first oil spout is used for receiving the chaining service request according to the firing current feedback input channel from the eTPU unit, judges the working state of oil sprayer;
Firing current feedback inspection module; Be used for output signal according to the initial judge module of said first oil spout; Regularly will be fed back the firing current feedback input signal of input channel input and the threshold value of said fuel injector magnetic system unlatching chopper current by the firing current of eTPU unit compares; And export the copped wave control signal of two driving voltages respectively through the copped wave control channel of eTPU unit according to comparative result, control the switching tube of two driving voltages respectively;
Firing current control finishes module, is used for the output signal according to the initial judge module of said first oil spout, finishes flash copped wave process.
Said maintenance current control module comprises:
Second initialization module is used for before said maintenance current control module is started working, according to the service call of CPU the passage in the eTPU unit being carried out initialization;
The initial judge module of second oil spout is used for judging according to the chaining service request that receives from the maintenance currrent feedback input channel of eTPU unit the working state of oil sprayer;
Keep currrent feedback inspection module; Be used for output signal according to the initial judge module of said second oil spout; Regularly will keep the threshold value of chopper current to compare by maintenance currrent feedback input signal and the said fuel injector magnetic system that the maintenance currrent feedback input channel of eTPU unit is imported; And according in comparative result two driving voltages of copped wave control channel output through the eTPU unit than the copped wave control signal of low driving voltage, control switching tube than low driving voltage.
8. method as claimed in claim 7 is characterized in that: the initial judge module of said first oil spout, judge current oil spout state according to flag bit; If be fuel injection beginning; A timer and B timer in the eTPU unit then are set respectively; Output A timer is matched to function signal or the B timer is matched to function signal; The said A of setting timer is used to specify the detection time of said firing current feedback, and the said B of setting timer is used to specify the retention time of firing current; Said firing current feedback inspection module is matched to function signal according to said A timer, carries out the inspection of firing current feedback; Said firing current control finishes module and is matched to function signal according to said B timer, finishes flash copped wave process;
The initial judge module of said second oil spout is judged current oil spout state according to flag bit; If be fuel injection beginning, then reset the A timer in the eTPU unit, output A timer is matched to function signal, and the said A of setting timer is used to specify the retention time of said maintenance electric current; Said maintenance is opened currrent feedback inspection module and is matched to function signal according to said A timer, keeps the currrent feedback inspection.
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| CN201010576749.2A CN102536566B (en) | 2010-12-07 | 2010-12-07 | System and method for performing fuel injector current waveform control by using enhanced time processor unit (eTPU) |
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| CN201010576749.2A CN102536566B (en) | 2010-12-07 | 2010-12-07 | System and method for performing fuel injector current waveform control by using enhanced time processor unit (eTPU) |
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| CN103807066A (en) * | 2012-11-05 | 2014-05-21 | 株式会社电装 | Fuel injection device |
| CN109779806A (en) * | 2019-02-01 | 2019-05-21 | 中国第一汽车股份有限公司 | Fuel injector fictitious load drive current waveform adjusts system and method for adjustment |
| US11230990B2 (en) | 2019-11-11 | 2022-01-25 | Caterpillar Inc. | Method and system for valve movement detection |
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| CN102536566B (en) | 2014-01-22 |
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