CN108412627B - Intelligent driving device and method for diesel engine electric control common rail system - Google Patents
Intelligent driving device and method for diesel engine electric control common rail system Download PDFInfo
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- CN108412627B CN108412627B CN201810377777.8A CN201810377777A CN108412627B CN 108412627 B CN108412627 B CN 108412627B CN 201810377777 A CN201810377777 A CN 201810377777A CN 108412627 B CN108412627 B CN 108412627B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 68
- 239000007924 injection Substances 0.000 claims abstract description 68
- 239000000446 fuel Substances 0.000 claims abstract description 36
- 230000009471 action Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 90
- 238000005070 sampling Methods 0.000 claims description 41
- 230000000630 rising effect Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000001052 transient effect Effects 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000003745 diagnosis Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3827—Common rail control systems for diesel engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/406—Electrically controlling a diesel injection pump
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The embodiment of the invention discloses an intelligent driving device and method of an electric control common rail system of a diesel engine, wherein the device comprises a control module, an intelligent gate control driving module, a DC-DC boosting module, an oil injector driving module and an oil pump control valve driving module; the control module determines the current injection cylinder sequence according to signals of a crankshaft and a camshaft of the engine and generates an oil injection control signal; the intelligent gate control driving module is used for boosting a power supply, driving and controlling an oil injector and an oil pump control valve, the DC-DC boosting module is used for boosting a power supply voltage to be high voltage required by oil injection driving, the oil injection driving module is used for driving oil injection action of the oil injector, and the oil pump control valve driving module is used for driving action of the oil pump control valve. The invention overcomes the defect of the traditional design of the fuel injection control unit by adopting a discrete device, has higher integration level, can realize intelligent driving control, has low cost and wide application range.
Description
Technical Field
The invention relates to the technical field of diesel engine driving control, in particular to an intelligent driving device and method of an electric control common rail system of a diesel engine.
Background
In order to meet the increasingly strict emission regulations, time-pressure type electronically controlled fuel injection systems are widely used in diesel engines. When the diesel engine works, the flexible control of fuel injection is realized mainly by controlling the fuel injector and the fuel pump control valve, which is also the core function of the electric control fuel injection system. The emission performance, the power performance and the economic performance of the diesel engine are optimally matched by precisely controlling the oil injection pressure, the oil injection quantity and the oil injection time.
The traditional common rail diesel engine fuel injection control adopts a design scheme of discrete devices, and each functional module contained in the design scheme is to build a circuit module by using the discrete devices so as to realize the fuel injection control function, so that the circuit integration level is low, the cost is high, the control logic is relatively complex to realize, and hardware circuit design is often required to be changed when the common rail diesel engine fuel injection control is matched with actuators of different manufacturers, so that the universality is poor.
Disclosure of Invention
The embodiment of the invention provides an intelligent driving device and method for an electronic control common rail system of a diesel engine, which are used for solving the problems of low integration level and high cost of a fuel injection control circuit of the diesel engine in the prior art.
In order to solve the technical problems, the embodiment of the invention discloses the following technical scheme:
The invention provides an intelligent driving device of an electronic control common rail system of a diesel engine, which comprises a control module, an intelligent gate control driving module, a DC-DC boosting module, an oil injector driving module and an oil pump control valve driving module; the control module is connected with the DC-DC boosting module, the fuel injector driving module and the oil pump control valve driving module through the intelligent gate control driving module respectively.
Further, the control module comprises a microcontroller and a peripheral circuit thereof, wherein the peripheral circuit comprises a power circuit, a clock circuit, a reset circuit, a brushing circuit and a watchdog circuit which are connected with the microcontroller, an AD pin of the microcontroller outputs rail pressure signals, and a plurality of ETPU pins respectively output crankshaft signals, camshaft signals, control signals of an oil pump control valve and control signals of each oil injector.
Further, the intelligent gate control driving module comprises an intelligent gate control driving chip, and the model is PT2000.
Further, the DC-DC boost module comprises a resistor R1, one end of the resistor R1 is connected with a G_LS7 or G_LS8 pin of the intelligent gate control driving chip, the other end of the resistor R1 is connected with one end of a capacitor C4 and a grid electrode of a MOS tube Q1 respectively, the other end of the capacitor C4 and the source electrode of the MOS tube are both connected with one end of a resistor R2, the other end of the resistor R2 is grounded, two ends of the resistor R2 are connected with VENSEPz pins of the intelligent gate control driving chip, a drain electrode of the MOS tube Q1 is connected with one end of an inductor L1 and the positive electrode of a diode D1 respectively, the other end of the inductor L1 is connected with one end of a capacitor C3, the other end of the capacitor C3 is grounded, the other end of the inductor L1 is connected with a power supply, the negative electrode of the diode D1 is connected with one end of a capacitor C1 and one end of a capacitor C2 respectively, the other ends of the capacitor C1 and the other end of the capacitor C2 are both connected with one end of the resistor R2, and the positive electrode of the diode D1 outputs a high-voltage power supply.
Further, the oil injection driving module comprises a sampling resistor R3, wherein two ends of the sampling resistor R3 are connected with VENSEPz pins of the intelligent gate control driving chip, one end of the sampling resistor R3 is grounded, the other end of the sampling resistor R3 is respectively connected with one end of a capacitor C10, a source electrode of a MOS tube Q5 and a source electrode of a MOS tube Q4, the other end of the capacitor C10 is respectively connected with one end of a resistor R8 and a grid electrode of the MOS tube Q5, the other end of the resistor R8 is connected with G_ LSy pins of the intelligent gate control driving chip, and a drain electrode of the MOS tube Q5 is respectively connected with D_ LSy pins of the intelligent gate control driving chip, an anode of a diode D5 and one end of one oil injector; the source electrode of the MOS transistor Q4 is also connected with one end of a capacitor C9, the other end of the capacitor C9 is respectively connected with one end of a resistor R7 and the grid electrode of the MOS transistor Q4, the other end of the resistor R7 is connected with the G_ LSy pin of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q4 is respectively connected with the D_ LSy pin of the intelligent gate control driving chip, the positive electrode of the diode D4 and one end of two fuel injectors of the diode D4, the other ends of one fuel injector and two fuel injectors of the diode D3 are respectively connected with the negative electrode of the diode D2 and the source electrode of the MOS transistor Q2, the positive electrode of the diode D3 is grounded, the positive electrode of the diode D2 is respectively connected with the source electrode of the MOS transistor Q3, one end of the capacitor C7 and one end of the capacitor C8, the other end of the capacitor C8 is connected with the B_HSx pin of the intelligent gate control driving chip, the other end of the capacitor C7 is respectively connected with one end of the grid electrode of the MOS transistor Q3, the other end of the resistor R6 is connected with the G_HSx pin of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q3 is connected with the drain electrode of the capacitor C5, and the other end of the capacitor C5 is connected with the other end of the capacitor Q5 is connected with the other end of the capacitor Q5, and the other end of the capacitor Q5 is connected with the grid electrode of the capacitor Q5.
Further, the oil pump control valve driving module includes a sampling resistor R4, the two ends of the sampling resistor R4 are connected with VENSEPz pins of the intelligent gate control driving chip, one end of the sampling resistor R4 is grounded, the other end is connected with one end of a capacitor C14 and the source electrode of a MOS transistor Q7, the other end of the capacitor C14 is connected with the grid electrode of the MOS transistor Q7 and one end of a resistor R10, the other end of the resistor R10 is connected with g_ LSy pins of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q7 is connected with d_ LSy pins of the intelligent gate control driving chip, the anode of a diode D7 and one end of the oil pump control valve, the other end of the oil pump control valve is connected with the cathode of a diode D6, one end of a capacitor C12 and one end of a capacitor C13, the anode of the diode D6 is grounded, the other end of the capacitor C13 is connected with b_hsx pins of the intelligent gate control driving chip, the other end of the capacitor C12 is connected with one end of a resistor R9 and the grid electrode of a MOS transistor Q6, the other end of the resistor R9 is connected with g_hsx pin of the intelligent gate control driving chip, and the drain electrode of the capacitor C11 is connected with the other end of the capacitor C11 and one end of the diode is grounded.
The second aspect of the invention provides an intelligent driving method of an electronic control common rail system of a diesel engine, which comprises the following steps:
Determining a current injection cylinder sequence according to signals of a crankshaft and a camshaft of the engine, and generating an oil injection control signal;
And according to the oil injection control signal, boosting the power supply voltage to high voltage required by oil injection driving, and simultaneously driving the actions of the oil injector and the oil pump control valve.
Further, the specific process of boosting the power supply voltage to the high voltage required by the oil injection driving is as follows:
setting the maximum value and the minimum value of the sampling current;
acquiring a value of a sampling current and judging the size of the sampling current;
When the sampling current is smaller than the minimum value of the set current, the MOS tube Q1 is conducted, the sampling current is continuously increased, the output voltage is continuously increased, and when the sampling current is increased to the maximum value of the set current, the MOS tube Q1 is closed, and the output voltage is increased to the maximum value of the set voltage;
the MOS tube Q1 is kept closed, the output voltage and the sampling current are continuously reduced until the sampling current is smaller than the minimum value of the set current, the MOS tube is turned on, and the boosting process of the previous step is repeated.
Further, the specific process of driving the oil injection action of the oil injector is as follows:
setting a first control parameter including a first peak drive current, a first holding current, and a first timer time setting;
When the rising edge of the oil injection control signal is detected, starting timing, and rising the current to a first peak driving current;
when the current starts to decline and the timer reaches a set value 1, a first holding current driving stage 1 is started, the current starts to rise, the fuel injector is opened to start fuel injection, and the current rises to the upper limit value of the holding current 1;
The current falls to the lower limit value of the holding current 1, the current starts to rise, when the timer reaches the set value 2, the holding current driving stage 2 is started, the current starts to fall after rising to the upper limit value of the holding current 2, the current starts to rise after falling to the lower limit value of the holding current 2, the current fluctuates between the upper limit value and the lower limit value of the holding current 2 until the oil injection control signal becomes a low level, and the oil injection is ended.
Further, the specific process of driving the oil pump control valve is as follows:
setting a second control parameter including a second peak drive current, a second hold current, and a second timer time setting;
When the rising edge of the oil injection control signal is detected, starting timing, and rising the current to a second peak driving current;
when the timer reaches a set value of 3, the timer enters a holding current driving stage, when the current rises to the upper limit value of the second holding current, the current starts to fall, when the current falls to the lower limit value of the second holding current, the current starts to rise, and the current fluctuates between the upper limit value and the lower limit value of the second holding current until the oil injection control signal is at a low level, and the oil pump control valve is closed.
The effects provided in the summary of the invention are merely effects of embodiments, not all effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
1. the DC-DC boosting module, the fuel injector driving module and the oil pump control valve driving module are all driven and controlled by the integrated intelligent gate control driving chip, the defect that a fuel injection control unit is designed by adopting a discrete device in the traditional way is overcome, the intelligent driving control can be realized, and the cost is low.
2. The intelligent gate control driving chip drives the oil injector and the oil pump control valve in real time according to the control signal sent by the microcontroller to achieve the purpose of accurately controlling oil injection and rail pressure, and meanwhile, the intelligent gate control driving chip has perfect fault diagnosis and protection functions. Under the condition that hardware is unchanged, the magnitude of current, delay time and voltage value of a boosting power supply in each stage can be changed through software parameter setting, matching requirements of different types of fuel injectors and oil pump control valves can be met, and the method can be widely applied to six-cylinder and below electric control diesel engine fuel injection systems and has good control effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the control module of the present invention;
FIG. 3 is a schematic circuit diagram of a DC-DC boost module of the present invention;
FIG. 4 is a schematic circuit diagram of a fuel injection driving module of the present invention;
fig. 5 is a circuit schematic of the oil pump control valve driving module of the present invention.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
As shown in fig. 1, the intelligent driving device of the diesel engine electric control common rail system comprises a control module, an intelligent gate control driving module, a DC-DC boosting module, an oil injector driving module and an oil pump control valve driving module. The control module is respectively connected with the DC-DC boosting module, the fuel injector driving module and the oil pump control valve driving module through the intelligent gate control driving module. The DC-DC boosting module is used for controlling a boosting power supply, the oil injector driving module is used for driving an oil injector, and the oil pump control valve driving module is used for driving an oil pump control valve.
As shown in fig. 2, the control module includes a microcontroller and its peripheral circuits, the microcontroller uses a 32-bit single-chip microcomputer MPC5745R of the encarpium company, the driving signal is generated by a time processing unit ETPU inside the MPC5745R, the AD pin of the MPC5745R outputs rail pressure signals, and the multiple ETPU pins respectively output crankshaft signals, camshaft signals, control signals of the oil pump control valves, and control signals of the respective injectors. The peripheral circuit comprises a power circuit, a clock circuit, a reset circuit, a brushing circuit and a watchdog circuit which are connected with the microcontroller.
The control module controls the oil injection timing and the oil injection quantity by opening and closing an electromagnetic valve of the oil injector, the energizing moment of the electromagnetic valve determines the oil injection starting point, and the energizing duration and the common rail pressure jointly determine the oil injection quantity. The control module judges the cylinder according to the engine crankshaft signal and the camshaft signal and determines the current injection cylinder sequence, and when the injection time of a certain cylinder is reached, the ETPU module sends out an injection control signal STARTx to be output to the injection driving module, so as to complete the injection control function. The target oil injection pressure is calculated through the final oil injection quantity and the rotating speed, then the actual rail pressure control quantity is obtained by combining the actually collected rail pressure signals, the corresponding oil pump control signal is obtained by inquiring the software MAP, and the ETPU module sends STARTx signals to the oil pump control valve driving module to complete the closed-loop control of the common rail pressure.
The intelligent gate control driving module comprises an intelligent gate control driving chip, the model is PT2000, the fault diagnosis function is integrated inside, and fault diagnosis such as open circuit and short circuit of the electromagnetic valve can be realized.
As shown in fig. 3, the DC-DC boost module includes a resistor R1, one end of the resistor R1 is connected to a pin g_ls7 or g_ls8 of the intelligent gate driving chip, the other end is connected to one end of a capacitor C4 and a gate of a MOS transistor Q1, the other end of the capacitor C4 and a source of the MOS transistor are both connected to one end of a resistor R2, the other end of the resistor R2 is grounded, two ends of the resistor R2 are connected to a pin VENSEPz of the intelligent gate driving chip, a drain of the MOS transistor Q1 is connected to one end of an inductor L1 and an anode of a diode D1, the other end of the inductor L1 is connected to one end of a capacitor C3, the other end of the capacitor C3 is grounded, the other end of the inductor L1 is also connected to a power supply, a cathode of the diode D1 is connected to one end of a capacitor C1 and one end of a capacitor C2, the other ends of the capacitor C1 and the other end of the capacitor C2 are both connected to one end of the resistor R2, and the anode of the diode D1 outputs a high voltage power supply.
The DC-DC boost power supply is used to boost the supply voltage to the high voltage required for fuel injection driving. The control of the boost power supply is realized by PT2000, a current detection and voltage feedback module for DC-DC conversion is integrated in the intelligent gate control driving chip PT2000, and the conduction and closing of an external MOS tube are controlled to achieve the purposes of boosting and stabilizing voltage by setting the maximum value and the minimum value of a sampling resistor R2 and the maximum value and the minimum value of output voltage.
In the step-up start stage, the intelligent gate driving chip PT2000 is in an enabling asynchronous mode, the PT2000 detects the current flowing through the circuit through the resistor R2 and compares the current with the maximum value and the minimum value of the current set in the circuit in real time, and the conduction and the closing of the Q1 are triggered. When the current is lower than the minimum value of the set current, the Q1 is turned on, the diode D1 is turned off reversely, the current flowing through the inductor L1 is continuously increased, and the inductor L1 stores certain energy; when the current reaches the maximum value of the current setting, Q1 is closed, the current flows through the diode D1 to charge the capacitor until the output voltage reaches the maximum value of the setting voltage, PT2000 enters an enabling synchronous mode, and at the moment, Q1 is always in a closed state until the output voltage reaches the minimum value of the voltage setting. According to different working conditions, the duty ratio and the frequency of the output are regulated and controlled in real time, so that the purposes of boosting and stabilizing voltage are achieved.
As shown in fig. 4, a driving circuit diagram for realizing injection of a six-cylinder diesel engine by adopting three BANK (control bodies) is shown in an illustration by taking a six-cylinder engine as an illustration, and the injection cylinder sequence is 1-5-3-6-2-4 and supports the simultaneous injection of three cylinders. Diesel fuel injection control below six cylinders is similar. Taking BANK as an example, the oil injection driving module comprises a sampling resistor R3, wherein two ends of the sampling resistor R3 are connected with VENSEPz pins of an intelligent gate driving chip, one end of the sampling resistor R3 is grounded, the other end of the sampling resistor R3 is respectively connected with one end of a capacitor C10, a source electrode of a MOS tube Q5 and a source electrode of a MOS tube Q4, the other end of the capacitor C10 is respectively connected with one end of a resistor R8 and a grid electrode of the MOS tube Q5, the other end of the resistor R8 is connected with G_ LSy pins of the intelligent gate driving chip, and a drain electrode of the MOS tube Q5 is respectively connected with D_ LSy pins of the intelligent gate driving chip, an anode of a diode D5 and one end of one oil injector; the source electrode of the MOS transistor Q4 is also connected with one end of a capacitor C9, the other end of the capacitor C9 is respectively connected with one end of a resistor R7 and the grid electrode of the MOS transistor Q4, the other end of the resistor R7 is connected with the G_ LSy pin of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q4 is respectively connected with the D_ LSy pin of the intelligent gate control driving chip, the positive electrode of the diode D4 and one end of two fuel injectors of the diode D4, the other ends of one fuel injector and two fuel injectors of the diode D3 are respectively connected with the negative electrode of the diode D2 and the source electrode of the MOS transistor Q2, the positive electrode of the diode D3 is grounded, the positive electrode of the diode D2 is respectively connected with the source electrode of the MOS transistor Q3, one end of the capacitor C7 and one end of the capacitor C8, the other end of the capacitor C8 is connected with the B_HSx pin of the intelligent gate control driving chip, the other end of the capacitor C7 is respectively connected with one end of the grid electrode of the MOS transistor Q3, the other end of the resistor R6 is connected with the G_HSx pin of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q3 is connected with the drain electrode of the capacitor C5, and the other end of the capacitor C5 is connected with the other end of the capacitor Q5 is connected with the other end of the capacitor Q5, and the other end of the capacitor Q5 is connected with the grid electrode of the capacitor Q5.
The oil injection driving module controls the on and off of the high-low side MOS tube in different driving stages by setting control parameters such as peak driving current, holding current, delay time and the like and feeding back the driving current value in the circuit in real time through the resistor R3, so that the accurate control of the oil injector is realized. The operation of the fuel injector 1 is illustrated by using the Peak & Hold1& Hold2 current driving mode.
The intelligent gate control driving chip PT2000 detects the rising edge of STARTx signals and enters the peak current driving stage of the fuel injector. In the driving stage, the high-side MOS transistor Q2 and the low-side MOS transistor Q4 are controlled to be conducted, a high-voltage power supply is driven by a high end to be added to the upper end of the oil sprayer 1, and current in a circuit continuously rises until the peak current is reached. When the current rises to the peak value, Q2 is closed, the current enters a Bypass stage (current falling stage), the current starts to fall, when the timer reaches a set value, the current enters a holding current driving stage 1 (hold 1 stage), at this time, the high-side MOS transistor Q3 and the low-side MOS transistor Q4 are conducted, the current starts to rise until the current rises to the upper limit value of the holding current 1, the MOS transistor Q3 is turned off, the current in the circuit starts to fall, the current falls to the lower limit value of the holding current 1, the high-side MOS transistor Q3 and the low-side MOS transistor Q4 are conducted again, when the timer reaches the set value, the holding current driving stage 2 is entered, the high-side MOS transistor Q3 and the low-side MOS transistor Q4 are conducted, the current starts to rise until the current rises to the upper limit value of the holding current 2, the MOS transistor Q3 and the low-side MOS transistor Q4 are turned on again until STARTx signals become low-level oil injection ends.
As shown in fig. 5, the oil pump control valve driving module includes a sampling resistor R4, two ends of the sampling resistor R4 are connected to VENSEPz pins of the intelligent gate control driving chip, one end of the sampling resistor R4 is grounded, the other end is connected to one end of a capacitor C14 and a source electrode of a MOS transistor Q7, the other end of the capacitor C14 is connected to a gate electrode of the MOS transistor Q7 and one end of a resistor R10, the other end of the resistor R10 is connected to g_ LSy pin of the intelligent gate control driving chip, a drain electrode of the MOS transistor Q7 is connected to d_ LSy pin of the intelligent gate control driving chip, an anode of a diode D7 and one end of the oil pump control valve, the other end of the oil pump control valve is connected to a cathode of a diode D6, one end of a capacitor C12 and one end of a capacitor C13, an anode of the diode D6 is grounded, the other end of the capacitor C13 is connected to b_hsx pin of the intelligent gate control driving chip, the other end of the capacitor C12 is connected to one end of the resistor R9 and the gate electrode of the MOS transistor Q6, and the other end of the resistor R9 is connected to the drain electrode of the capacitor C11 and the other end of the capacitor D is grounded.
According to the current flow characteristics of the oil pump control valve, the flow gradually decreases until it closes as the driving current increases. In order to realize the quick response driving of the oil pump control valve, a Peak and Hold current mode is adopted, and the accurate control of the oil pump control valve is realized by setting control parameters such as Peak driving current, holding current, delay time and the like. The specific working process is as follows:
The intelligent gate control chip PT2000 detects the rising edge of STARTx signals and enters the peak current driving stage of the oil pump control valve. In the driving stage, the high-side MOS transistor Q6 and the low-side MOS transistor Q7 are controlled to be conducted, a power supply is driven by a high end to be added to the upper end of the oil pump control valve, and current in the circuit continuously rises until the peak current is reached. When the current rises to the peak value, the Q6 is closed, the Bypass stage is started at the moment, the current starts to fall, when the timer reaches a set value, the current enters a holding current driving stage, the high-side MOS transistor Q6 and the low-side MOS transistor Q7 are conducted at the moment, the current starts to rise until the current rises to the upper limit value of the holding current, the MOS transistor Q6 is turned off, the current in the circuit starts to fall, the current falls to the lower limit value of the holding current, the high-side MOS transistor Q6 and the low-side MOS transistor Q7 are conducted again until STARTx signals become low level control to end.
The control of the high side MOS tube and the low side MOS tube in the oil injector driving module and the oil pump control valve driving module is realized by PT2000, transient current flowing through the electromagnetic valve is collected in real time through current sampling, and compared with the set current values of each stage, the switching on and switching off of the high side MOS tube and the low side MOS tube are controlled, so that the electromagnetic valve is controlled based on a current driving mode.
The intelligent gate driving module further comprises a diagnosis unit, wherein the diagnosis unit comprises a pre-diagnosis stage and an automatic diagnosis stage, the pre-diagnosis stage is performed before the start signal STARTx is changed to the high level, and the automatic diagnosis stage is entered after the pre-diagnosis is finished until STARTx is changed to the low level to be finished. And a plurality of comparators are arranged in the PT2000, real-time comparison is performed between the real-time voltage values at a plurality of pins and the set voltage comparison limit value, and short circuit or open circuit faults are judged according to output values obtained through feedback of the comparators, so that fault diagnosis functions of the oil injector and the oil pump control valve are completed.
The PT2000 is internally provided with a plurality of voltage comparators, the states of LSx_Vds_fbk, HSx_src_fbk and HSx_Vds_Vbat_ fbk are obtained by detecting voltage feedback at a plurality of pins and comparing with a set voltage comparison limit value in real time, the states are compared with a normal state, so that a fault state is judged, faults such as short circuit, open circuit and the like of an actuator can be judged according to the output values obtained through the feedback of the comparators, and a fault diagnosis function is completed. Through SPI bus interface, realize with the interaction of singlechip diagnostic information, the fault diagnosis term that can accomplish is: the high side of the oil injector or the oil pump control valve is short-circuited to the ground; the source electrode and the drain electrode of the high-side MOS tube of the oil injector or the oil pump control valve are short-circuited; the source electrode and the drain electrode of the low-side MOS tube of the oil injector or the oil pump control valve are short-circuited; the fuel injector or the oil pump control valve is opened; the low side of the oil sprayer or the oil pump control valve is short-circuited to a power supply; the low side of the fuel injector or the oil pump control valve is short-circuited to ground.
The invention also provides an intelligent driving method of the diesel engine electric control common rail system, which comprises the following steps: determining a current injection cylinder sequence according to signals of a crankshaft and a camshaft of the engine, and generating an oil injection control signal; and according to the oil injection control signal, boosting the power supply voltage to high voltage required by oil injection driving, and simultaneously driving the actions of the oil injector and the oil pump control valve.
The specific process of boosting the power supply voltage to the high voltage required by oil injection driving is as follows: setting the maximum value and the minimum value of the sampling current; acquiring a value of a sampling current and judging the size of the sampling current; when the sampling current is smaller than the minimum value of the set current, the MOS tube Q1 is conducted, the sampling current is continuously increased, the output voltage is continuously increased, and when the sampling current is increased to the maximum value of the set current, the MOS tube Q1 is closed, and the output voltage is increased to the maximum value of the set voltage; the MOS tube Q1 is kept closed, the output voltage and the sampling current are continuously reduced until the sampling current is smaller than the minimum value of the set current, the MOS tube is turned on, and the boosting process of the previous step is repeated.
The specific process for driving the oil injection action of the oil injector is as follows: setting a first control parameter including a first peak drive current, a first holding current, and a first timer time setting; when the rising edge of the oil injection control signal is detected, starting timing, and rising the current to a first peak driving current; when the current starts to decline and the timer reaches a set value 1, a first holding current driving stage 1 is started, the current starts to rise, the fuel injector is opened to start fuel injection, and the current rises to the upper limit value of the holding current 1; the current falls to the lower limit value of the holding current 1, the current starts to rise, when the timer reaches the set value 2, the holding current driving stage 2 is started, the current starts to fall after rising to the upper limit value of the holding current 2, the current starts to rise after falling to the lower limit value of the holding current 2, the current fluctuates between the upper limit value and the lower limit value of the holding current 2 until the oil injection control signal becomes a low level, and the oil injection is ended.
The specific process of driving the oil pump control valve to act is as follows: setting a second control parameter including a second peak drive current, a second hold current, and a second timer time setting; when the rising edge of the oil injection control signal is detected, starting timing, and rising the current to a second peak driving current; when the timer reaches a set value of 3, the timer enters a holding current driving stage, when the current rises to the upper limit value of the second holding current, the current starts to fall, when the current falls to the lower limit value of the second holding current, the current starts to rise, and the current fluctuates between the upper limit value and the lower limit value of the second holding current until the oil injection control signal is at a low level, and the oil pump control valve is closed.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that numerous modifications and variations can be made without departing from the principles of the invention, and such modifications and variations are considered to be within the scope of the invention.
Claims (1)
1. An intelligent driving device of an electric control common rail system of a diesel engine is characterized in that: the device comprises a control module, an intelligent gate control driving module, a DC-DC boosting module, an oil sprayer driving module and an oil pump control valve driving module;
the control module determines the current injection cylinder sequence according to signals of a crankshaft and a camshaft of the engine and generates an oil injection control signal; the intelligent gate control driving module is used for boosting a power supply, driving and controlling an oil injector and an oil pump control valve, the DC-DC boosting module is used for boosting a power supply voltage to a high voltage required by driving the oil injector, the oil injector driving module is used for driving the oil injection action of the oil injector, and the oil pump control valve driving module is used for driving the action of the oil pump control valve;
The intelligent gate control driving module comprises an intelligent gate control driving chip, and the model is PT2000;
The DC-DC boosting module comprises a resistor R1, one end of the resistor R1 is connected with a G_LS7 or G_LS8 pin of the intelligent gate control driving chip, the other end of the resistor R1 is respectively connected with one end of a capacitor C4 and a grid electrode of a MOS tube Q1, the other end of the capacitor C4 and a source electrode of the MOS tube are both connected with one end of a resistor R2, the other end of the resistor R2 is grounded, two ends of the resistor R2 are connected with VENSEPz pins of the intelligent gate control driving chip, a drain electrode of the MOS tube Q1 is respectively connected with one end of an inductor L1 and the positive electrode of a diode D1, the other end of the inductor L1 is connected with one end of a capacitor C3, the other end of the capacitor C3 is grounded, the other end of the inductor L1 is also connected with a power supply, the negative electrode of the diode D1 is respectively connected with one ends of the capacitor C1 and the capacitor C2, and the other end of the capacitor C1 is both connected with one end of the resistor R2, and the positive electrode of the diode D1 outputs a high-voltage power supply;
in the starting stage of boosting, an intelligent gate control driving chip PT2000 is in an enabling asynchronous mode, the PT2000 detects the current flowing through a circuit through a resistor R2 and compares the current with the maximum value and the minimum value of the current set in the circuit in real time, and the conduction and the closing of a MOS tube Q1 are triggered;
When the current is lower than the minimum value of the set current, the MOS tube Q1 is turned on, the diode D1 is turned off reversely, the current flowing through the inductor L1 is continuously increased, and the inductor L1 stores certain energy;
when the current reaches the maximum value of the current setting, the MOS transistor Q1 is closed, the current flows through the diode D1 to charge the capacitor until the output voltage reaches the maximum value of the setting voltage, the PT2000 enters an enabling synchronous mode, and the MOS transistor Q1 is always in a closed state until the output voltage reaches the minimum value of the voltage setting;
The control module comprises a microcontroller and a peripheral circuit thereof, wherein the peripheral circuit comprises a power circuit, a clock circuit, a reset circuit, a brushing circuit and a watchdog circuit which are connected with the microcontroller, an AD pin of the microcontroller outputs rail pressure signals, and a plurality of ETPU pins respectively output crankshaft signals, camshaft signals, control signals of an oil pump control valve and control signals of all oil injectors;
The oil sprayer driving module comprises a sampling resistor R3, wherein two ends of the sampling resistor R3 are connected with VENSEPz pins of an intelligent gate control driving chip, one end of the sampling resistor R3 is grounded, the other end of the sampling resistor R3 is respectively connected with one end of a capacitor C10, a source electrode of a MOS tube Q5 and a source electrode of a MOS tube Q4, the other end of the capacitor C10 is respectively connected with one end of a resistor R8 and a grid electrode of the MOS tube Q5, the other end of the resistor R8 is connected with G_ LSy pins of the intelligent gate control driving chip, and a drain electrode of the MOS tube Q5 is respectively connected with D_ LSy pins of the intelligent gate control driving chip, an anode of a diode D5 and one end of a first oil sprayer; the source electrode of the MOS transistor Q4 is also connected with one end of a capacitor C9, the other end of the capacitor C9 is respectively connected with one end of a resistor R7 and the grid electrode of the MOS transistor Q4, the other end of the resistor R7 is connected with the G_ LSy pin of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q4 is respectively connected with the D_ LSy pin of the intelligent gate control driving chip, the positive electrode of the diode D4 and one end of a second fuel injector, the other ends of the first fuel injector and the second fuel injector are respectively connected with the negative electrode of the diode D3, the negative electrode of the diode D2 and the source electrode of the MOS transistor Q2, the positive electrode of the diode D3 is grounded, the positive electrode of the diode D2 is respectively connected with the source electrode of the MOS transistor Q3, one end of the capacitor C7 and one end of the capacitor C8, the other end of the capacitor C8 is connected with the B_HSx pin of the intelligent gate control driving chip, the other end of the capacitor C7 is respectively connected with one end of the resistor R6 and the grid electrode of the MOS transistor Q3, the other end of the resistor R6 is connected with the G_HSx of the intelligent gate control driving chip, the drain electrode of the MOS transistor Q3 is connected with the drain electrode of the capacitor C5, the other end of the capacitor C5 is connected with the drain electrode of the capacitor C5 and the other end of the capacitor C5 is connected with the other end of the capacitor Q5;
The oil pump control valve driving module comprises a sampling resistor R4, wherein two ends of the sampling resistor R4 are connected with VENSEPz pins of an intelligent gate control driving chip, one end of the sampling resistor R4 is grounded, the other end of the sampling resistor R4 is respectively connected with one end of a capacitor C14 and the source electrode of a MOS tube Q7, the other end of the capacitor C14 is respectively connected with the grid electrode of the MOS tube Q7 and one end of a resistor R10, the other end of the resistor R10 is connected with a G_ LSy pin of the intelligent gate control driving chip, the drain electrode of the MOS tube Q7 is respectively connected with a D_ LSy pin of the intelligent gate control driving chip, the positive electrode of a diode D7 and one end of an oil pump control valve, the other end of the oil pump control valve is respectively connected with the negative electrode of a diode D6, the source electrode of the MOS tube Q6, one end of a capacitor C12 and one end of a capacitor C13, the positive electrode of the diode D6 is grounded, the other end of the capacitor C13 is connected with a B_HSx pin of the intelligent gate control driving chip, the other end of the capacitor C12 is respectively connected with one end of the resistor R9 and the grid electrode of the MOS tube Q6, the other end of the resistor R9 is connected with a G_HSx pin of the intelligent gate driving chip, and the other end of the drain electrode of the capacitor Q11 is respectively connected with the power supply end of the capacitor C11 and the other end of the diode is grounded;
The fuel injector driving module controls the on and off of the high-low side MOS tube in different driving stages by setting peak driving current, holding current and delay time as control parameters and feeding back the driving current value in the circuit in real time through a resistor R3;
The intelligent gate control driving chip PT2000 detects the rising edge of STARTx signals, enters a peak current driving stage of the oil sprayer, controls the high-side MOS tube Q2 and the low-side MOS tube Q4 to be conducted in the driving stage, and the high-voltage power supply is added to the oil sprayer through high-side driving, and the current in the circuit continuously rises until reaching the peak driving current; when the current rises to the peak driving current, Q2 is closed, a current falling stage is entered, the current starts to fall, when the timer reaches a set value, a first holding current driving stage is entered, at this time, the high side MOS tube Q3 and the low side MOS tube Q4 are turned on, the current starts to rise until the current rises to the upper limit value of the first holding current, the MOS tube Q3 is turned off, the current in the circuit starts to fall, the current falls to the lower limit value of the first holding current, the high side MOS tube Q3 and the low side MOS tube Q4 are turned on again, when the first timer reaches the set value, a second holding current driving stage is entered, at this time, the high side MOS tube Q3 and the low side MOS tube Q4 are turned on, the current starts to rise until the current rises to the upper limit value of the second holding current, the MOS tube Q3 and the low side MOS tube Q4 are turned on again, and the current starts to fall to the lower limit value of the second holding current until STARTx signal becomes the low level oil injection is finished;
According to the current flow characteristic of the oil pump control valve, the flow gradually decreases until the oil pump control valve is closed along with the increase of the driving current; in order to realize the quick response driving of the oil pump control valve, a Peak & Hold current mode is adopted, and the accurate control of the oil pump control valve is realized by setting Peak driving current, holding current and delay time; the specific working process is as follows:
The intelligent gate control chip PT2000 detects the rising edge of STARTx signals and enters the peak current driving stage of the oil pump control valve; in the driving stage, the high-side MOS transistor Q6 and the low-side MOS transistor Q7 are controlled to be conducted, a power supply is driven by the high side to be added to an oil pump control valve, and current in a circuit continuously rises until the peak driving current is reached; when the current rises to the peak driving current, Q6 is closed, a current falling stage is started at the moment, the current starts to fall, when a timer reaches a set value, a holding current driving stage is started, at the moment, the high-side MOS tube Q6 and the low-side MOS tube Q7 are conducted, the current starts to rise until the current rises to the upper limit value of the holding current, the MOS tube Q6 is turned off, the current in the circuit starts to fall, the current falls to the lower limit value of the holding current, the high-side MOS tube Q6 and the low-side MOS tube Q7 are conducted again until STARTx signals become low level control to end;
The control of the high side MOS tube and the low side MOS tube in the oil injector driving module and the oil pump control valve driving module is realized by PT2000, transient current flowing through the electromagnetic valve is collected in real time through current sampling, and compared with the set current values of each stage, the switching on and switching off of the high side MOS tube and the low side MOS tube are controlled, so that the electromagnetic valve is controlled based on a current driving mode.
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| CN116545291A (en) * | 2023-04-24 | 2023-08-04 | 无锡凌博电子技术股份有限公司 | Boosting controller of electric vehicle |
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