CN202510232U - Electronic control system of closed-loop control for diesel combustion - Google Patents
Electronic control system of closed-loop control for diesel combustion Download PDFInfo
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- CN202510232U CN202510232U CN 201120520528 CN201120520528U CN202510232U CN 202510232 U CN202510232 U CN 202510232U CN 201120520528 CN201120520528 CN 201120520528 CN 201120520528 U CN201120520528 U CN 201120520528U CN 202510232 U CN202510232 U CN 202510232U
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Abstract
The utility model relates to an electronic control system of closed-loop control for diesel combustion. The electronic control system consists of a pressure collecting unit part, an oil injection electric control unit part, a software part and a display part. The pressure collecting unit part consists of an optical-electric encoder, an optical fiber pressure sensor, a conditioning circuit, a digital signal processor DSP56F807 and a high speed data communication module. The oil injection electric control unit part consists of various sensors, a signal conditioning module, a microprocessor MPC555, a communication module and an electromagnetic valve drive circuit. The high speed data communication module of the pressure collecting unit is connected with the communication module of the oil injection electric control unit through a data bus. The high speed data communication module of the pressure collecting unit is connected with a test monitoring computer, and the communication module of the oil injection electric control unit is connected with a monitoring computer.
Description
One, technical field
The utility model relates to the automatical control system of diesel combustion closed loop control, belongs to internal-combustion engine electronic control oil spout technical field.
Two, background technique
Along with the energy shortage problem becomes increasingly conspicuous and diesel emission rules increasingly stringent, require the diesel engine energy-saving and emission-reduction, and have best performance, control requires meticulousr to diesel engine fuel injecting.Present electronic Control for Diesel Engine is based on the control of experiment arteries and veins spectrum (MAP), owing to do not relate to combustion state parameter, to the combustion process in the cylinder, it is still a kind of open loop control.For the situation beyond the demarcation condition, as fuel oil quality change, part is aging, manufacturing variation etc., this open loop control can not provide best control, can't make diesel engine operate in the optimum state.Along with the increase of controlling object, automatical control system becomes increasingly complex, and accurately control is very important, and closed loop control is a kind of effective way that improves control accuracy.The feedback parameter choose reasonable is very big to the closed loop control influential effect; In-cylinder combustion pressure be the reflection cylinder combustion burn situation the most directly, parameter the most reliably; Combustion position in the cylinder has determined the performance and the discharging of diesel engine; Cylinder pressure has comprised many information of cylinder combustion burning situation, and the cylinder pressure feedback is introduced automatical control system, can provide a reflection diesel combustion situation to indicate in real time; Can realize the diesel engine combustion closed loop control, motor is carried out combustion position monitoring and fault diagnosis.
In Diesel Engine Control, the close-loop control scheme of having used has: speed closed loop control, injection advance angle closed loop control during idling.
1) speed closed loop control during idling.At the diesel engine idling operation, because diesel engine outside outputting power, be controlling object with the actual measurement rotating speed of diesel engine, the fuel injection quantity size is regulated, make the target value set that reaches of diesel engine speed.This closed loop control is the peripheral parameter control to the diesel engine running state.
2) injection advance angle closed loop control.In Exhaust Control for Diesel Engine, be controlling object with the fuel injection beginning of diesel engine, the crank angle of opening with needle-valve is a value of feedback, and the injection advance angle size is regulated, and makes fuel injection beginning of diesel engine near target value set.This closed loop control is setup parameter control with diesel emissions the best, only relates to the output result of cylinder inner core burning.
More than two kinds of closed loop controls do not relate to the core-combustion process of diesel engine, belong to the closed loop control of the peripheral parameter of diesel engine running state.Because non-linear, the suitable sex change of diesel engine combustion; The in-cylinder combustion parameter is difficult for accurately obtaining; Be difficult for measuring reliably like cylinder temperature, thermal discharge; Have only the in-cylinder combustion pressure parameter relatively easily to measure at present, but the firing pressure test instrument is because big, the affected by environment bigger shortcoming of volume can't be applied to the vehicle-mounted on-line testing use of diesel engine.Therefore, the pressure acquisition instrument miniaturization, being easy to vehicle-mounted use is the technical problem that needs to be resolved hurrily, the automatical control system that makes up the diesel combustion closed loop is the reasonable approach that realizes the diesel engine optimal control.
Three, summary of the invention
The utility model purpose is to solve above technical problem, and the electronic control technology of filling up the diesel combustion closed loop control is blank.
1, burning closed loop control method
The burning closed loop control method: on the oil injection system electric control unit basis, the real-time many circle collections combustion pressure signal of pressure acquisition unit, and carry out pressure parameter and handle; Extract the geometrical characteristic parameter of combustion pressure curve; And providing the combustion characteristic feedback parameter to the oil spout ECU, the oil spout ECU is optimum value according to diesel engine status parameter and operating conditions with moment of torsion or exhaust index; Fuel injection quantity, injection timing are regulated, made diesel engine operate in the optimal parameter situation.
2, the automatical control system of burning closed loop control
The automatical control system of burning closed loop control has pressure acquisition, data processing communication and oil spout control function; Form by two sub-cells: oil spout ECU and pressure acquisition unit; The oil spout ECU is made up of throttle sensor, speed probe, pressure transducer, temperature transducer, signal condition module, microprocessor MPC555, driving circuit for electromagnetic valve, communication module; According to the diesel engine status parameter, accomplish diesel engine fuel injecting control.Pressure acquisition unit is made up of photoelectric encoder, optic fiber pressure transducer, conditioning circuit, digital signal processor DSP 56F807 and high-speed data communications module; Accomplishing the cylinder of diesel engine internal pressure gathers and data processing; And, constitute the burning closed loop control to ECU transmission pressure feedback amount.The high-speed data communications module of pressure acquisition unit is connected through data/address bus with the communication module of oil spout ECU.Automatical control system presents the dual micro processor parallel organization, and two dual micro processors are independently accomplished pressure acquisition and oil spout control separately.
1) pressure acquisition unit
Pressure acquisition unit adopts DSP digital signal processor to accomplish functions such as pressure acquisition, data processing, data communication, on pressure acquisition, combustion characteristic parameter and feedback parameter, and the new method below having proposed:
(1) acquisition method
Because the data space of single-chip microcomputer is far smaller than computer, data file is the bottleneck that single-chip microcomputer acquisition system institute must solve, and adopts local crank angle range acquisition method and reduces the collection period and reduce the pressure data file size.In the part scale zone of the grating dish of photoelectric encoder grating is set; Be used to produce trigger signal; Guarantee in compression stroke budc-50 ° CA to the local crank angle range between 100 ° of CA of top dead center as the cylinder pressure data capture segment; Can reduce data volume widely, can reflect into combustion process well again, the parameter of dynamic acquisition is as shown in table 1.
Table 1 dynamic acquisition parameter
(2) combustion characteristic parameter
Because diesel engine combustion is that periodically the short time circulation takes place, and introduces its combustion process of feature description of physics cyclical movement, with phase place, intensity and promptness conceptual description combustion process.Burning performance parameter has burning initial point, burning terminal point, maximum combustion pressure, pressure maximum rise rate and corner thereof; 50% mass burning rate, exothermic maximum amount etc.; The parameter of reflection combustion phase has maximum explosive pressure corner, maximum voltage rise rate corner, 50% mass burning rate corner etc., and the parameter of reflection combustion intensity has maximum explosive pressure, maximum voltage rise rate, mean indicated pressure etc.Introduce pressure difference curve geometric properties point, confirm burning starting point, intensity and the corresponding pressure characteristic parameter of terminal point.With the pressure initial point that raises, pressure difference peak delta Pmax and corner Δ θ Pmax thereof, focus point pressure difference Δ PC, and corner Δ θ C, the outer corner difference of fixation pressure difference is described combustion process.
(3) pressure parameter and performance index relation
The output quantity of diesel engine is moment of torsion and discharging, and useful horsepower, moment of torsion can calculate through cylinder pressure, though obtain output quantity through calculation of thermodynamics, process is loaded down with trivial details, consuming time too much, is not suitable for the requirement of control in real time.In order to simplify complexity of calculation, select rotating speed and load to be basic parameter, the pressure characteristic parameter is a major parameter, confirms the diesel engine output quantity with mapping method.In a certain scope,, just carry out match with piecewise polynomial fitting or spline function method to input quantity and output quantity.The input and output relation of representing the diesel engine in the whole working condition scope with the function relation of the input and output amount of a plurality of subranges.
2) oil spout ECU
The oil spout ECU adopts MPC555 single-chip microcomputer finishing stage parameter acquisition, fuel injection parameter and functions such as signal is confirmed, oil spout control, data communication, on fuel injection signal simplification, power drive, and the new method below having proposed:
(1) single channel fuel injector control signal
Conventional fuel injection signal is to be produced by two passages; One is output relatively (OC), and another is pulse-width signal (PWM), so; When the cylinder of diesel engine number increases; Fuel injector control signal takies more to the channel resource of control single chip computer, and general single-chip microcomputer function has only 8 port numbers, can't adapt to the application of high-power multi-cylinder diesel engine.Adopt single channel output comparing function (OC), can reduce channel resource and take, adapt to high-power multi-cylinder diesel engine control requirement.
(2) high-speed electromagnetic valve power drive
Fuel injector magnetic system belongs to high-speed electromagnetic valve; The unlatching realization of high-speed electromagnetic valve needs big electric current unlatching, little electric current to keep; Owing to adopt the control of single channel fuel injection signal; Produce the big electric current of opening, the little electric current of maintenance by high-speed electromagnetic valve power driving circuit hardware, make control electric current reliable and stable.
Four, description of drawings
Fig. 1 forms for automatical control system.
Fig. 2 is each parts of automatical control system.
Fig. 3 is optic fiber pressure transducer figure.
Fig. 4 is trigger signal pulse figure.
Fig. 5 is high-speed electromagnetic valve driving principle figure.
Fig. 6 is proportional electromagnetic valve driving principle figure.
Fig. 7 is the pressure acquisition software block diagram.
Fig. 8 is oil spout control software flow pattern.
Fig. 9 is control principle figure.
Five, embodiment
The automatical control system of diesel combustion closed loop control comprises four parts: pressure acquisition unit part, oil spout ECU part, software section and display unit, and shown in accompanying drawing 1.The high-speed data communications module of pressure acquisition unit is connected through data/address bus with the communication module of oil spout ECU.
1. pressure acquisition unit part
Form in the accompanying drawing 2 at the automatical control system parts, pressure acquisition unit 1 is made up of photoelectric encoder 11, optic fiber pressure transducer 12, DSP digital signal processor 13, high-speed data communications module 14 and conditioning circuit 15.Photoelectric encoder 11 is connected with corresponding conditioning circuit 15 respectively with optic fiber pressure transducer 12; Conditioning circuit 15 is through the input pin of signaling line incoming digital signal processor 13; High-speed data communications module 14 is connected with DSP digital signal processor 13 communication channels, and high-speed data communications module 14 is connected with test monitoring computer 41 through datawire 44.
Optic fiber pressure transducer 11 adopts AutoPSI-TC (temperature compensation type the is fit to the motor dynamically pressure testing) optic fiber pressure transducer of U.S. Optrand company, shown in accompanying drawing 3.Voltage 0.5-4.8V output.The linearity ± 1%FSO, measuring range 0-20MPa, temperature-50-300 ℃.Optic fiber pressure transducer utilizes light to pass through different distance and produces phase change; It is by the pressure transducer head, and light source, optical fiber and photoelectric switching circuit are formed, and the variation of pressure deforms metallic film; Transform through photoelectricity; Direct voltage output signal, the advantage of optic fiber pressure transducer are that antijamming capability is strong, miniaturization.
Photoelectric encoder 12 adopts incremental optical-electricity encoder, has designed the grating dish again, the grating dish is whenever rotated a circle produce 300 angle pulse signals, produces signal pulse shown in accompanying drawing 4.Signal Z is a synchronizing signal, and output signal A is the corner signal of whenever exporting at a distance from 0.5 degree.
DSP digital signal processor 13 adopts the digital signal processor DSP 56F807 of Freescale company; It is a special microprocessor of handling live signal, and height can reach the instruction execution speed
of 40,000,000 instruction/S (MIPS), can fix a point, Floating-point Computation; Its basic configuration is: a CAN2.0B module; Two SCI modules, 12 A/D of independent 8 passages, program FLASH is 64K; RAM 2K; The bus frequency of 80MHz, the AD single channel sample frequency of DSP56807 reaches 200kHz, is higher than general 100kHz.
2. oil spout ECU part
In the automatical control system parts were formed accompanying drawing 2, oil spout ECU 2 was made up of throttle sensor 21, speed probe 22, pressure transducer 23, temperature transducer 24, communication module 25, driving circuit for electromagnetic valve 26 and 32 single-chip microcomputers 27 and signal condition module 28.Throttle sensor 21, speed probe 22, pressure transducer 23, temperature transducer 24 connect with corresponding signal condition module 28 respectively; Signal condition module 28 inserts the pin of microprocessor 27 through signaling line; Communication module 25 is connected with microprocessor 27 communication channels; Communication module 25 is connected with supervisory control comuter 42 through datawire 43, and microprocessor 27 control output channels are connected with driving circuit for electromagnetic valve 26.
Sensor 21-24 gathers the status parameter of motor, mainly contains rotating speed, throttle position, suction pressure, oil temperature, and parameters such as cooling water temperature are confirmed the state that motor moves, and select Bosch company temperature and pressure sensor for use.
Driving circuit for electromagnetic valve 26 has high-speed electromagnetic valve and ratio electromagnetic circuit to drive two kinds; The high-speed electromagnetic valve schematic diagram adopts mono signal to drive shown in accompanying drawing 5, realizes that by hardware circuit big electric current is opened, little electric current keeps; Control signal control Ultrafast recovery diode S1, S2; S1, the different different size of current of combination results that open and close of S2, S1, S2 closure simultaneously increase electric current rapidly, and solenoid valve is opened fast; S2 breaks off behind the certain hour, and electric current descends, and S2 keeps little electric current and makes solenoid valve be held open state under PWM control subsequently.After S1, S2 broke off simultaneously, the electric current in the electromagnetic valve coil reduced to zero rapidly via two Ultrafast recovery diode D2, D1, and solenoid valve cuts out rapidly.Proportional electromagnetic valve drive circuit schematic diagram shown in accompanying drawing 6, by power amplification circuit, high voltage switch circuit, protective circuit is formed.
Single-chip microcomputer 27 adopts high performance 32-bit microprocessor MPC555; Its dominant frequency is up to 40MHz; Inner 26Ksram; 448kFlash, simultaneously also integrated 8 modules on the sheet comprise that formation asynchronous serial passage (QSMCM), dual time processing unit (TPU3), input capture/output comparison timer, 12 A/D modular converters of deque (QADC64), 1 pulse width modulation module, 1 modular system I/O mouth (MISO1), two CAN2.0 control CAN module (TUOCANTM).
3. software
In accompanying drawing 2, software 3 is made up of pressure acquisition software 31, control software 32 and display software 33 3 parts.
Pressure acquisition software 31 is contained in the DSP digital signal processor 13, is made up of program initialization, data capture, data processing, data computation and data communication, adopts the C Plus Plus establishment, and software block diagram is shown in accompanying drawing 7.Wherein data capture is embedded in the interrupt service routine of DSP digital signal processor; Realize triggering by exterior interrupt-corner signal; Realize the valve voltage signal acquisition through the A/D collecting function, be converted to the valve displacement through electric voltage displacement, and be stored in the corresponding array.Data processing is carried out the homogenizing processing and is sought the characteristic point value data, and the method for processing is with the cylinder pressure data that collect under each crank angle, finds out all maximum of points and corresponding crank angles in the detection range, calculates burning initial point, middle pressure.And with characteristic point value and whole homogenization pressures storage in a certain space.
Control software 32 is contained in the MPC555 single-chip microcomputer 27, and its structure is based on the synchronous circulation of diesel engine operation angle, mainly triggers with nested through interrupt service routine, and promptly the operating mechanism of stopping ring guarantees.Stopping ring is caught the cam monodentate and is brought into operation, and declares the calculating of cylinder, mean speed and transient speed according to logical relation, carries out the control of injection timing, fuel injection pulsewidth, injection pressure according to this, shown in accompanying drawing 8.Control software 32 is made up of interrupt module, initialization module, function module, main control module; Interrupt module is accomplished pressure control, the oil spout sequential is confirmed and data communication; Function module comprises parameter acquisition module, rotating speed puocessing module, injection pressure control module, injection timing and fuel injection quantity module, fault processing module etc.; The main control module is accomplished fault judgement, operating mode is judged; Carry out normal control circle, according to system the function that will realize, initialization module is mainly accomplished SCM system initialization and operating function initialization.
Display software 33 comprises pressure data display software and oil spout control display software two-part.
The pressure data display software is contained in the test monitoring computer 41, adopts LABVIEW software programming data display interface, shows maximum outbreak pressure and parameters such as corner, burning initial point thereof, and shows that pressure of explosion is with the crank angle change curve.Adopt serial communication (SCI) mode by DSP digital signal processor, only transmit parameters such as valve lift, port timing angle, adopt USB whole pressure datas of mode high-speed transfer and corresponding crank angle.
The control display software is contained in the supervisory control comuter 42, adopts LABVIEW software programming data display interface, data capture, show in real time and function such as data preservation all is integrated on the main interface, and on PC, shows.The control display interface has comprised system's setting, data capture, parameter calibration, four parts of off-line simulation; Its corresponding drop-down menus'display; Function key is arranged on the data transmission and goes to the display place, data reception area and data storing path, and control PID coefficient is adjusted.
The electric control system controls principle is shown in accompanying drawing 9.Gather cylinder pressure signal in real time by pressure acquisition unit, and treated pressure data, the pressure characteristic value extracted; Convert the pressure feedback amount into; Pass to the oil spout ECU, the oil spout ECU is poor according to desired value and pressure feedback value, carries out PID control; Fuel injection parameter is revised, and provided fuel injector control signal.
Claims (3)
1. the automatical control system of a diesel combustion closed loop control; It is characterized in that this automatical control system is made up of pressure acquisition unit (1) and oil spout ECU (2) two sub-cells; Pressure acquisition unit (1) is made up of photoelectric encoder (11), optic fiber pressure transducer (12), conditioning circuit (15), DSP digital signal processor (13) and high-speed data communications module (14); Oil spout ECU (2) is made up of throttle sensor (21), speed probe (22), pressure transducer (23), temperature transducer (24), communication module (25), driving circuit for electromagnetic valve (26), microprocessor (27) and signal condition module (28), and the high-speed data communications module (14) of pressure acquisition unit (1) is connected through data/address bus with the communication module (25) of oil spout ECU (2).
2. the automatical control system of diesel combustion closed loop control as claimed in claim 1; It is characterized in that pressure acquisition unit based on digital signal processor DSP 56F807; Photoelectric encoder (11) is connected with corresponding conditioning circuit (15) respectively with optic fiber pressure transducer (12); Conditioning circuit (15) is through the input pin of signaling line incoming digital signal processor (13); High-speed data communications module (14) is connected with DSP digital signal processor (13) communication channel, and high-speed data communications module (14) is connected with test monitoring computer (41) through datawire (44).
3. the automatical control system of diesel combustion closed loop control as claimed in claim 1; It is characterized in that oil spout ECU based on 32-bit microprocessor MPC555; Throttle sensor (21), speed probe (22), pressure transducer (23), temperature transducer (24) connect with corresponding signal condition module (28) respectively; Signal condition module (28) inserts the pin of microprocessor (27) through signaling line; Communication module (25) is connected with microprocessor (27) communication channel, and communication module (25) is connected with supervisory control comuter (42) through datawire (43), and microprocessor (27) control output channel is connected with driving circuit for electromagnetic valve (26); Adopt the single control signal drive controlling, hardware circuit produces the current value of solenoid valve work.
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| CN 201120520528 CN202510232U (en) | 2011-12-14 | 2011-12-14 | Electronic control system of closed-loop control for diesel combustion |
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| CN 201120520528 CN202510232U (en) | 2011-12-14 | 2011-12-14 | Electronic control system of closed-loop control for diesel combustion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397512A (en) * | 2019-07-29 | 2019-11-01 | 壹站科技服务(武汉)有限公司 | A kind of diesel electric-controlled management system |
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2011
- 2011-12-14 CN CN 201120520528 patent/CN202510232U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397512A (en) * | 2019-07-29 | 2019-11-01 | 壹站科技服务(武汉)有限公司 | A kind of diesel electric-controlled management system |
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Granted publication date: 20121031 |