CN201221417Y - Diesel high pressure common rail fuel system electric control device - Google Patents

Abstract

The utility model discloses an electric control device of a diesel engine high-pressure co-orbital fuel system which includes a CPU, an analog signal collection module, a digital signal collection module, an oil sprayer drive module, a co-orbital pressure control module, an exhaust emission control module and a power module. The electric control device adopts a 32 bit CPU chip, thus having a quicker data processing speed; a plurality of high performance integrated circuits are adopted, thus achieving the co-orbital pressure control of 160MPa, solving the control problem of not mutual effect between the oil spraying amount and the spraying pressure, successfully realizing a plurality of spraying like pre-spraying, main-spraying, back-spraying, and the like; and effectively reducing the exhaust emission.

Description

Diesel engine high-pressure co-rail oil-fired system electric controller

Technical field

The utility model relates to a kind of diesel engine high-pressure co-rail oil-fired system electric controller.

Background technique

Diesel engine is as a kind of compression ignition internal combustion engine, and its advantage is the energy utilization rate height, and sufficient combustion compares that petrol engine dynamic property is strong, reliability is high, and oil consumption aspect diesel engine is lower than petrol engine, and combustion efficiency is higher, discharges lower.And the electric control device of high pressure co-rail diesel engine is a kind of novel engine management device that is controlled to be feature with high pressure fuel injection that forms on the basis that traditional distribution type and in-line arrangement and middle pressure are sprayed, but press jet pressure generally to be no more than 80MPa in existing, because pressure is less, make that the burning of diesel oil is abundant inadequately, simultaneously also caused the pollution of exhaust emission bigger, and 16 machines of the many employings of existing ECU (Electrical Control Unit), motion speed is not high, limit the number of times that sprays, be unfavorable for the abundant burning of diesel oil.

The model utility content

For solving the above-mentioned technical problem of the electric control device existence that has diesel engine now, the utility model provides a kind of reliability height, can effectively solve the control problem that fuel injection quantity and jet pressure are independent of each other, and the diesel engine high-pressure co-rail oil-fired system electric controller that exhaust emissions is effectively controlled.

The technological scheme that the utility model solves the problems of the technologies described above is: comprise central processing unit (CPU), collection of simulant signal module, digital signal acquiring module, oil sprayer driver module, pressure control of common rail system module, exhaust emissions control module and power module, described central processing unit (CPU) carries out communication with collection of simulant signal module, digital signal acquiring module, oil sprayer driver module, pressure control of common rail system module, exhaust emissions control module respectively and is connected, and power module is the electric controller power supply.

Above-mentioned a kind of diesel engine high-pressure co-rail oil-fired system electric controller is characterized in that: described central processing unit (CPU) is 32 TMS470R1VF67A microcontroller minimum systematic modules.

Above-mentioned a kind of diesel engine high-pressure co-rail oil-fired system electric controller, it is characterized in that: described exhaust emissions control module comprises EGR control module and particle capture control module.

Technique effect of the present utility model is: adopted 32 central processing unit (CPU) chips, data processing speed is very fast, adopts a large amount of high performance integrated circuits, has realized the pressure control of common rail system up to 160MPa; Solved the control problem that fuel injection quantity and jet pressure are independent of each other; Successful realization multi-injections such as pre-spray, main jet and back spray; Reduced the discharging of tail gas effectively.

The utility model is described in further detail below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the circuit diagram of the utility model oil sprayer driver module;

Fig. 3 regulates the drive circuit figure of controlling and driving module for the utility model waste gas circulation;

Fig. 4 is the circuit diagram of the utility model power module.

Embodiment

Referring to Fig. 1, the TMS470R1VF67A microcontroller minimum systematic module that has adopted 32 among the embodiment is as central processing unit (CPU).Collection of simulant signal module, digital signal acquiring module, oil sprayer driver module, pressure control of common rail system module, exhaust emissions control module are carried out carrying out communication with central processing unit (CPU) respectively and are connected.Microcontroller receives the signal of all the sensors transmission on the motor, after processing and diagnosis, by the calculating of the whole control strategy of motor, sends correctly to final controlling element, and the performance element of control signal driving timely moves according to anticipation reaction.Unique HET function and analog-to-digital conversion at a high speed provide complicated real-time control solution for diesel engine.Wherein, high-end timer (HET---high endtimer) is the distinctive timer that aims at Automobile Motor Design of TI company's T MS470R1 series 32-bit microprocessor, it is a kind of senior intelligent timer, can be for using the timing function that provides complicated in real time, random access memory that carries and corresponding instruction collection, make its work can be independent of micro-processor kernel, save the resource of controller preciousness.High-end timer is used for comparison/catch and general I/O mouth, it is particularly suitable for the control of the rail pressure change of control that the oil sprayer timing sprays, high-pressure common rail, and the detection of camshaft location and crank phase detection etc. need complicated and the accurate multisensor syste of time sequential pulse ripple.It has 30 high-resolution pins, and 2 standard resolution pins also have high-resolution pin sharing characteristic (XOR), makes it comparison/littler signal of the cycle of catching.Its resolution can reach 17us when being 60MHz as system clock, this resolution can be with variation and the high pressure oil pump of control Millisecond and the action of oil sprayer of catching rail pressure in real time, thereby the diesel oil that is ejected in the cylinder is burnt in optimized mode, satisfy power requirements and emission standard.

The signal that described digital signal acquiring module and collection of simulant signal module are gathered comprises: fuel oil temperature signals collecting, coolant temperature collection, intake temperature collection, exhaust gas temperature is gathered, common rail pressure is gathered, accelerator pedal signal collection, oil and water seperator signals collecting, the charge flow rate signals collecting, oxygen sensor signal is gathered, turbo boost pressure collection, air conditioning pressure collection, the EGR positioning control, the particle capture signals collecting.The analog data acquisition module has the input of 15 tunnel analogue signal, and 32 TMS470R1VF67A microprocessors can provide 16 tunnel analog-to-digital conversion to have satisfied the collection of the various sophisticated signals of motor.The key of analog data acquisition just is to collect various data volumes in real time, and the key of its real-time just is the conversion rate of A/D, and the A/D conversion rate of 32 TMS470R1VF67A microprocessors can reach 1.55us, can accomplish real-time conversion fully.Simultaneously, ignition switch, brake switch, clutch switch, cruise switch and glow plug relay, camshaft location, the required switching signal of using of digital signal acquirings such as tach signal has only 9 the tunnel, and 32 TMS470R1VF67A microprocessors can provide 69 tunnel I/O passage, are enough to satisfy the demands.

Referring to Fig. 2, the function of oil sprayer driver module is exactly that control diesel oil ejects correct oil mass with correct injection pressure at correct time point, thereby guarantees the diesel engine smooth running and save fuel oil.The ULTRAFET MOSFET---HUF76419D3 of the intergrated circuit IR2102 that its main PWM drives and the quick unlatching of fairchild FAIRCHILD company and recovery forms.The pwm control signal that IR2102 produces according to high-end timer HET drives HUF76419D3 and makes its work (unlatching of PWM ripple in IR2102 postpones and the shut-in time is 300ns); The HUF76419D3 pipe is driven by the PWM ripple that amplifies, and high pressure is offered electric-controlled fuel injector make it oil spout, and when VGS=10V, this pipe opening time maximum only is 62ns, and trunon delay time only is 6.5ns; Therefore signal from HET produce through processing arrive electric-controlled fuel injector time less than 500ns, this provides reliable injection source for strict diesel injection, has satisfied repeatedly spray in advance, main jet and the repeatedly requirement of injection such as back spray.

Referring to Fig. 3, waste gas circulation is regulated controlling and driving module one EGR controlling and driving module, it is exactly by scheme for exhaust gas circulation system that waste gas circulation is regulated, part waste gas is introduced into the suction tude of motor, waste gas content remaining in the cylinder increases, and transfer process and the reduction toxic emission for energy has positive effect so to a certain extent.This circuit is exactly that the high-speed a/d that utilizes smart quick sensor that the signal that collects is delivered to 32 TMS470R1VF67A microprocessors is changed, and makes its accurate HET produce control signal.Driver module is mainly finished by TLE7209-2R, and this chip drives electric current can reach 6.6A, and driver frequency can reach 30KHz, and rising and fall time all can be less than 2ms.

The particle capture control module mainly is to collect acquisition equipment differential pressure pickup information of passing back and the regenerative system of controlling acquisition equipment.The partial combustion of diesel fuel in the engine, give off various types of diesel particulations, as carbon, inorganic oxide and hydrocarbon, these particulates constantly condense upon on the acquisition equipment, the pressure drop at acquisition equipment two ends is increased, pass to ECU (Electrical Control Unit) by differential pressure pickup,, trigger ECU (Electrical Control Unit) when numerical value reaches setting value, send control signal, the temperature that increases the particle capture thing makes its spontaneous combustion, thereby disposes the power of being condensed, to recover the pressure reduction at acquisition equipment two ends.

Referring to Fig. 4, power module has adopted the high common mode difference of LMP8270, and the highi degree of accuracy amplification accurately detects the electric current that the automobile electrical source is exported, and makes the safety that can both guarantee power supply on vehicle under the various vehicle conditions.High-precision amplifying has extremely low offset voltage and drift, so degree of accuracy is high, and the common mode input scope is also comparatively wide, and output voltage surpasses external reference voltage, i.e. expression system is in charged state; If output voltage is lower than external reference voltage, then expression system is in discharge condition.Because therefore this amplifier can accurately measure two-way load current according to reference voltage monitoring output.Its offset voltage is extremely low simultaneously, be no more than 250uV, offset drift voltage then guarantees can be above 15uV/ ℃, even therefore operation still can be regulated less input differential signal by the utmost point exactly in-40 ℃ to+125 ℃ wide temperature range, and the error of guaranteeing voltage compensation can reduce to minimum, therefore is applicable to extremely severe automobile applied environment.And the TPS70151 power supply chip that adopts can be exported required 1.8V of CPU and 3.3V simultaneously, can also produce reset signal, such chip is finished three kinds of purposes, can produce physical vibration because automobile is in operation, the integrated chip of this height has played important function to the reliability and stability that improve system.

Claims (3)

1, a kind of diesel engine high-pressure co-rail oil-fired system electric controller, it is characterized in that, comprise central processing unit (CPU), collection of simulant signal module, digital signal acquiring module, oil sprayer driver module, pressure control of common rail system module, exhaust emissions control module and power module, described central processing unit (CPU) carries out communication and is connected with collection of simulant signal module, digital signal acquiring module, oil sprayer driver module, pressure control of common rail system module, waste gas circulation adjusting controlling and driving module respectively, and power module is the electric controller power supply.

2, a kind of diesel engine high-pressure co-rail oil-fired system electric controller according to claim 1 is characterized in that: described central processing unit (CPU) is 32 TMS470R1VF67A microcontroller minimum systematic modules.

3, a kind of diesel engine high-pressure co-rail oil-fired system electric controller according to claim 1, it is characterized in that: described exhaust emissions control module comprises EGR control module and particle capture control module.

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