CN110748428A - Oil sprayer driving circuit - Google Patents
Oil sprayer driving circuit Download PDFInfo
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- CN110748428A CN110748428A CN201911156883.4A CN201911156883A CN110748428A CN 110748428 A CN110748428 A CN 110748428A CN 201911156883 A CN201911156883 A CN 201911156883A CN 110748428 A CN110748428 A CN 110748428A
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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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
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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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
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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
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
Abstract
The invention discloses a fuel injector driving circuit which comprises a current sampling circuit and a microcontroller, wherein the current sampling circuit is used for acquiring the driving current value of a fuel injector in real time, and the microcontroller triggers an AD conversion module to acquire the driving current value of the fuel injector; the TPU unit compares the driving current value of the oil sprayer in the current state with a target driving current value and adjusts the characteristic value of the driving current according to the comparison result; the CPLD generates modulation output pulses according to the current characteristic value adjusted in the previous period and the input drive enabling signal; the modulation output pulse controls the high-end driving circuit and the low-end driving circuit to adjust the driving current of the oil sprayer in the period, so that the driving current value of the oil sprayer approaches to the target driving current value. The oil sprayer driving circuit can adapt to the driving of oil sprayers of different models without modifying hardware parameters, automatically corrects the driving waveform difference caused by the long-term use of the oil sprayer, ensures the consistency of driving current, improves the oil spraying stability of the oil sprayer and prolongs the service life of an electromagnetic valve of the oil sprayer.
Description
Technical Field
The invention relates to the technical field of electric control oil injectors, in particular to an oil injector driving circuit.
Background
In a common fuel injector driving circuit in the market, current regulation is mostly realized by adopting hardware regulation and using a current conditioning circuit, once the parameters are determined, online regulation can not be realized according to the parameters of the fuel injector, and the current conditioning circuit also causes complexity increase of the whole circuit. In order to meet the requirements of oil injectors of different models, the drive circuit needs to modify hardware parameters; moreover, after some fuel injectors are used for a period of time, the inductance of the electromagnetic valve is aged, parameters are scattered to a certain degree, and finally large differences of driving currents are caused, and hardware parameters are required to be modified to deal with the situations. The above application limitations make the conventional driving circuit inflexible in application and high in design and maintenance costs.
Disclosure of Invention
The invention aims to solve the technical problem of providing an oil injector driving circuit which can adapt to the driving of oil injectors of different models without modifying hardware parameters, automatically correct the driving waveform difference caused by long-term use of the oil injectors, ensure the consistency of driving current, improve the oil injection stability of the oil injectors and prolong the service life of electromagnetic valves of the oil injectors.
In order to solve the technical problem, the invention provides an injector driving circuit, which comprises a CPLD, a high-side driving circuit, a low-side driving circuit, high-side switching tubes M1 and M2, a low-side switching tube M3, a resistor R, a diode D1 and a diode D2; the CPLD is respectively connected with a high-end driving circuit and a low-end driving circuit, two output ends of the high-end driving circuit are respectively connected with control ends of a high-end switch tube M1 and a high-end switch tube M2, a current input end of the high-end switch tube M1 is connected with a Boost power supply, a current output end of a high-end switch tube M1 is connected with an anode of a diode D1, a cathode of a diode D1 and a cathode of a diode D2 are both connected with input ends of an oil sprayer, an output end of the oil sprayer is connected with a current input end of a low-end switch tube M3, and a current output end of a low-; the current input end of the high-end switch tube M2 is connected with the battery voltage, and the current output end of the high-end switch tube M2 is simultaneously connected with the cathode of the diode D1, the cathode of the diode D2 and the current input end of the oil sprayer; the output end of the low-end driving circuit is connected with the control end of the low-end switching tube M3; the anode of the diode D2 is grounded; it also includes a current sampling circuit and a Microcontroller (MCU),
the current sampling circuit is used for collecting the driving current value of the oil injector in real time;
the CPLD synthesizes AD trigger pulse according to the input signal of the microcontroller;
the output end of the current sampling circuit is connected with an AD conversion module of a microcontroller, the microcontroller receives the AD trigger pulse, and the AD conversion module is triggered at the upper edge and the lower edge of the AD trigger pulse to acquire the driving current value of the oil sprayer;
the TPU unit of the microcontroller compares the driving current value of the oil sprayer in the current state with a target driving current value, and adjusts the characteristic value of the driving current according to the comparison result, and the adjusted characteristic value of the driving current is applied to generate a current modulation signal of the next period;
the CPLD generates modulation output pulses according to the current characteristic value adjusted in the last period and the input drive enabling signal; the modulation output pulse controls a high-end driving circuit and a low-end driving circuit, and the high-end driving circuit and the low-end driving circuit adjust the driving current of the oil sprayer in the period according to the modulation output pulse, so that the driving current value of the oil sprayer approaches to a target driving current value.
In a preferred embodiment of the present invention, the microcontroller further includes a DMA memory and a RAM memory, and the AD conversion module directly transfers the obtained characteristic value of the driving current of the injector to the RAM memory through a DMA channel of the DMA memory by conversion; and directly transferring the time value of each high pulse width and each low pulse width of the modulation output pulse acquired by the time processing unit to the RAM memory through a DMA channel of the DMA memory.
In a preferred embodiment of the present invention, the acquisition and modulation of the driving current value of the injector are performed all the time in the operation process of the TPU unit until the driving current value of the injector is consistent with the target driving current value.
In a preferred embodiment of the present invention, the microcontroller further comprises a time processing unit, the time processing unit supports pulse input and automatically calculates a time value of each of a high pulse width and a low pulse width of the modulation output pulse.
In a preferred embodiment of the present invention, the characteristic value of the driving current further includes an on time T0 of the high-side switch M1 in the high-voltage open phase, an on time T1 of the high-side switch M2 in the first-order maintaining phase, an off time T2 of the high-side switch M2 in the first-order maintaining phase, an on time T6 of the high-side switch M2 in the second-order maintaining phase, an off time T7 of the high-side switch M2 in the second-order maintaining phase, a duration T8 in the first-order maintaining phase, a transition time T3 from a peak value of the high-voltage open phase to a valley value of the first-order maintaining phase, a transition time T5 from the first-order current to the second-order current, and a duration T4 from a valley value of the first-order maintaining phase to a peak value of the last-order maintaining.
In a preferred embodiment of the present invention, the high-side switch M1 and the low-side switch M3 are both turned on during the high-voltage open phase, and the peak current value during the high-voltage open phase is related to the on-time of the high-side switch M1; during the first-order maintaining stage, the low-side switch tube M3 is always turned on, the high-side switch tube M2 is periodically turned on and off, the current peak value of the first-order maintaining stage is related to the turn-on time of the high-side switch tube M2, and the current valley value of the first-order maintaining stage is related to the turn-off time of the high-side switch tube M2; during the second-order maintaining stage, the low-side switch M3 is always turned on, the high-side switch M2 is periodically turned on and off, the current peak value of the second-order maintaining stage is related to the on-time of the high-side switch M2, and the current valley value of the second-order maintaining stage is related to the off-time of the high-side switch M2.
The invention has the beneficial effects that:
the oil atomizer driving circuit always keeps the consistency of the oil atomizer driving current through current closed-loop regulation, can adapt to the driving of oil injectors of different models without modifying hardware parameters, automatically corrects the driving current difference caused by the long-term use of the oil injectors, improves the oil injection stability of the oil injectors and prolongs the service life of electromagnetic valves of the oil injectors.
Drawings
FIG. 1 is a schematic circuit diagram of a fuel injector driver circuit in accordance with a preferred embodiment of the present invention;
FIG. 2 is a phase diagram of injector drive current and the corresponding sets of signals.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Examples
The present embodiment discloses an injector driving circuit, which is shown in fig. 1 and includes a CPLD, a current sampling circuit, a microcontroller MCU, a high-side driving circuit, a low-side driving circuit, high-side switching tubes M1 and M2, a low-side switching tube M3, a resistor R, a diode D1, and a diode D2.
The CPLD is respectively connected with a high-end driving circuit and a low-end driving circuit, two output ends of the high-end driving circuit are respectively connected with control ends of a high-end switch tube M1 and a high-end switch tube M2, a current input end of the high-end switch tube M1 is connected with a Boost power supply, a current output end of a high-end switch tube M1 is connected with an anode of a diode D1, a cathode of a diode D1 and a cathode of a diode D2 are both connected with an input end of an oil sprayer OI, an output end of the oil sprayer is connected with a current input end of a low-end switch tube M3, and a current output end of a; the current input end of the high-end switch tube M2 is connected with the battery voltage, and the current output end of the high-end switch tube M2 is simultaneously connected with the cathode of the diode D1, the cathode of the diode D2 and the current input end of the oil sprayer; the output end of the low-end driving circuit is connected with the control end of the low-end switching tube M3; the anode of diode D2 is connected to ground.
The current sampling circuit collects the driving current value of the oil injector in real time. Specifically, the driving current characteristic value includes a current peak value in a high-voltage open phase, a current peak value in a first-order maintaining phase, a current valley value in a first-order maintaining phase, a current peak value in a second-order maintaining phase, and a current valley value in a second-order maintaining phase. Wherein, the high-end switch tube M2 and the low-end switch tube M3 are both conducted in the high-voltage opening stage; the low-end switch tube M3 is always conducted in the first-order maintaining stage, and the high-end switch tube M2 is periodically conducted and turned off; the low-side switch tube M3 is always turned on in the second-order maintaining stage, and the high-side switch tube M2 is periodically turned on and off.
The CPLD is connected with the microcontroller MCU, and the AD trigger pulse is synthesized according to the input signal of the microcontroller MCU.
The output end of the current sampling circuit is connected with an AD conversion module of the microcontroller MCU, and the AD conversion module converts the analog signals collected by the current sampling circuit into digital signals; and the microcontroller receives the AD trigger pulse and triggers the AD conversion module to acquire the driving current value of the oil injector at the upper edge and the lower edge of the AD trigger pulse.
The TPU unit of the microcontroller compares the driving current value of the oil injector in the current state with a target driving current value, and adjusts the characteristic value of the driving current according to the comparison result, and the adjusted characteristic value of the current is applied to generate a current modulation signal of the next period;
the CPLD generates modulation output pulses according to the current characteristic value adjusted in the previous period and the input drive enabling signal, and the time processing unit of the microcontroller supports pulse input and automatically calculates the time value of each high pulse width and each low pulse width of the modulation output pulses. The time value obtained by the time processing unit through calculation is the driving current characteristic value of the current driving cycle, and as shown in fig. 2, the driving current characteristic value includes an on time T0 of the high-side switch M1 in the high-voltage open phase, an on time T1 of the high-side switch M2 in the first-order maintaining phase, an off time T2 of the high-side switch M2 in the first-order maintaining phase, an on time T6 of the high-side switch M2 in the second-order maintaining phase, an off time T7 of the high-side switch M2 in the second-order maintaining phase, a duration T8 in the first-order maintaining phase, a transition time T3 from the current peak value in the high-voltage open phase to the first current valley value in the first-order maintaining phase, a transition time T5 from the first-order current to the second-order current, and a duration T4 from the first current.
Specifically, the time processing unit calculates pulse widths (corresponding to a high pulse width of the high-side switch tube and a low pulse width of the low-side switch tube) of the modulation output pulse in each stage (a high-voltage open stage, a first-order maintaining stage and a second-order maintaining stage), where the pulse widths include on time and off time of the high-side switch tube and on time and off time of the low-side switch tube. (1) The current peak value of the high-voltage opening stage is related to the conduction time of the high-side switch tube M1 and the low-side switch tube M3; (2) the peak value of the current in the first-order holding phase is related to the on-time of the high-side switch tube M2, and the valley value of the current is related to the off-time of the high-side switch tube M2; (3) the peak current value of the second-order hold phase is related to the on-time of the high-side switch M2, and the valley current value is related to the off-time of the high-side switch M2.
The generated modulation output pulse controls a high-end drive circuit and a low-end drive circuit, and the high-end drive circuit and the low-end drive circuit adjust the drive current of the oil injector in the period according to the modulation output pulse so that the drive current value of the oil injector approaches to a target drive current value. The method comprises the steps of acquiring the driving current value of the oil injector and acquiring the characteristic value of the driving current of the oil injector all the time in the driving process, after the driving of the period is finished, comparing the driving current value with the target driving current value, adjusting the characteristic value of the current of the period, applying the adjusted characteristic value of the current to generate a current modulation signal of the next period, and ensuring the driving current of the oil injector to be consistent with the target current value all the time.
Referring to fig. 2, the overall driving process of the fuel injector will be divided into three phases:
high pressure open phase (time t0 to time t 1): m2 and M3 are both turned on, and the magnitude of the open time T0 will determine the magnitude of the peak of the driving current waveform.
First (second) order sustain phase (time t1 to time t 2): when the M3 tube is turned off, and is in the freewheeling stage after the peak current is reached, the freewheeling time T3 determines the magnitude of the first-order current oscillation valley.
When the freewheeling time T3 is over, the M3 tube is turned on again, the current starts to climb, and after the time T1, the oscillation peak value of the first-order current is reached, and the size of the oscillation peak value of the first-order driving current is determined by the size of the time T1.
When the rising time T1 is over, the M3 tube is turned off again, the current enters a descending channel, and the size of the time T2 determines the size of the first-order driving current oscillation valley value. The magnitude of time T8 determines the duration of the first-order sustain phase.
The oscillating current thus periodically rises and falls during the first-order current maintenance phase until the end of the first-order maintenance phase.
Third, the second order maintenance phase (time t2 to time t 3): after the first-order driving current is finished, the M3 tube is turned off, the current is in a follow current stage when the first-order current is transited to the second-order current, and the follow current time T5 determines the magnitude of the second-order current oscillation valley value.
When the freewheeling time T5 is over, the M3 tube is turned on again, the current starts to climb, and after the time T6, the oscillation peak value of the second-order current is reached, and the size of the oscillation peak value of the second-order driving current is determined by the size of the time T6.
When the rising time T6 is over, the M3 tube is turned off again, the current enters the falling channel, and the magnitude of the time T6 determines the magnitude of the second-order driving current oscillation valley value.
The oscillating current also periodically rises and falls during the second-order current maintenance phase until the end of the second-order current maintenance phase.
The microcontroller is provided with a DMA memory and an RAM memory, and the AD conversion module directly transfers the driving current characteristic value of the fuel injector obtained through conversion to the RAM memory through a DMA channel of the DMA memory; and the time value of each high pulse width and each low pulse width of the modulation output pulse acquired by the time processing unit is directly transferred to the RAM memory through a DMA channel of the DMA memory. The DMA channel can be used for unloading data without the intervention of the main MCU, so that the resources of the main MCU are saved.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. A fuel injector driving circuit comprises a CPLD, a high-end driving circuit, a low-end driving circuit, high-end switching tubes M1 and M2, a low-end switching tube M3, a resistor R, a diode D1 and a diode D2; the CPLD is respectively connected with a high-end driving circuit and a low-end driving circuit, two output ends of the high-end driving circuit are respectively connected with control ends of a high-end switch tube M1 and a high-end switch tube M2, a current input end of the high-end switch tube M1 is connected with a Boost power supply, a current output end of a high-end switch tube M1 is connected with an anode of a diode D1, a cathode of a diode D1 and a cathode of a diode D2 are both connected with input ends of an oil sprayer, an output end of the oil sprayer is connected with a current input end of a low-end switch tube M3, and a current output end of a low-; the current input end of the high-end switch tube M2 is connected with the battery voltage, and the current output end of the high-end switch tube M2 is simultaneously connected with the cathode of the diode D1, the cathode of the diode D2 and the current input end of the oil sprayer; the output end of the low-end driving circuit is connected with the control end of the low-end switching tube M3; the anode of the diode D2 is grounded; the method is characterized in that: it also includes a current sampling circuit and a Microcontroller (MCU),
the current sampling circuit is used for collecting the driving current value of the oil injector in real time;
the CPLD synthesizes AD trigger pulse according to the input signal of the microcontroller;
the output end of the current sampling circuit is connected with an AD conversion module of a microcontroller, the microcontroller receives the AD trigger pulse, and the AD conversion module is triggered at the upper edge and the lower edge of the AD trigger pulse to acquire the driving current value of the oil sprayer;
the TPU unit of the microcontroller compares the driving current value of the oil sprayer in the current state with a target driving current value, and adjusts the characteristic value of the driving current according to the comparison result, and the adjusted characteristic value of the driving current is applied to generate a current modulation signal of the next period;
the CPLD generates modulation output pulses according to the current characteristic value adjusted in the last period and the input drive enabling signal; the modulation output pulse controls a high-end driving circuit and a low-end driving circuit, and the high-end driving circuit and the low-end driving circuit adjust the driving current of the oil sprayer in the period according to the modulation output pulse, so that the driving current value of the oil sprayer approaches to a target driving current value.
2. The fuel injector drive circuit according to claim 1, characterized in that: the microcontroller is provided with a DMA memory and an RAM memory, and the AD conversion module directly transfers the driving current characteristic value of the fuel injector obtained through conversion to the RAM memory through a DMA channel of the DMA memory; and directly transferring the time value of each high pulse width and each low pulse width of the modulation output pulse acquired by the time processing unit to the RAM memory through a DMA channel of the DMA memory.
3. The fuel injector drive circuit according to claim 1, characterized in that: and the acquisition and modulation of the driving current value of the oil sprayer are carried out all the time in the operation process of the TPU unit until the driving current value of the oil sprayer is consistent with the target driving current value.
4. The fuel injector drive circuit according to claim 1, characterized in that: the microcontroller comprises a time processing unit which supports pulse input and automatically calculates the time value of each high pulse width and low pulse width of the modulation output pulse.
5. The fuel injector drive circuit according to claim 1, characterized in that: the driving current characteristic value comprises the conducting time (T0) of a high-voltage open-stage high-side switch tube M1, the conducting time (T1) of a first-stage maintaining-stage high-side switch tube M2, the turn-off time (T2) of a first-stage maintaining-stage high-side switch tube M2, the conducting time (T6) of a second-stage maintaining-stage high-side switch tube M2, the turn-off time (T7) of a second-stage maintaining-stage high-side switch tube M2, the duration (T8) of a first-stage maintaining stage, the transition time (T3) from a high-voltage open-stage current peak value to a first-stage maintaining-stage first current valley value, the transition time (T5) from a first-stage current valley value to a first-stage current peak value and the duration (T4) from the first-stage first current.
6. The fuel injector drive circuit according to claim 5, characterized in that: during the high-voltage opening stage, the high-side switch tube M1 and the low-side switch tube M3 are both turned on, and the current peak value of the high-voltage opening stage is related to the turn-on time of the high-side switch tube M1; during the first-order maintaining stage, the low-side switch tube M3 is always turned on, the high-side switch tube M2 is periodically turned on and off, the current peak value of the first-order maintaining stage is related to the turn-on time of the high-side switch tube M2, and the current valley value of the first-order maintaining stage is related to the turn-off time of the high-side switch tube M2; during the second-order maintaining stage, the low-side switch M3 is always turned on, the high-side switch M2 is periodically turned on and off, the current peak value of the second-order maintaining stage is related to the on-time of the high-side switch M2, and the current valley value of the second-order maintaining stage is related to the off-time of the high-side switch M2.
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| CN111749824A (en) * | 2020-07-01 | 2020-10-09 | 重庆红江机械有限责任公司 | High-speed fuel injector driving circuit with fault diagnosis function and judgment method |
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| CN113189904A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Detection circuit and detection method for oil sprayer driving circuit |
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| CN111927666A (en) * | 2020-08-14 | 2020-11-13 | 无锡职业技术学院 | High-pressure common rail oil sprayer rapid follow current circuit |
| CN111927666B (en) * | 2020-08-14 | 2021-10-29 | 无锡职业技术学院 | High-pressure common rail oil sprayer rapid follow current circuit |
| CN113189904A (en) * | 2021-04-15 | 2021-07-30 | 常州易控汽车电子股份有限公司 | Detection circuit and detection method for oil sprayer driving circuit |
| CN114704411A (en) * | 2022-04-14 | 2022-07-05 | 一汽解放汽车有限公司 | Electromagnetic valve drive control method |
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