CN110243606B - Control device of oil quantity metering unit - Google Patents
Control device of oil quantity metering unit Download PDFInfo
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- CN110243606B CN110243606B CN201910578036.0A CN201910578036A CN110243606B CN 110243606 B CN110243606 B CN 110243606B CN 201910578036 A CN201910578036 A CN 201910578036A CN 110243606 B CN110243606 B CN 110243606B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/165—Modifications for eliminating interference voltages or currents in field-effect transistor switches by feedback from the output circuit to the control circuit
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2623—Combustion motor
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electronic Switches (AREA)
Abstract
The embodiment of the invention discloses a control device of an oil quantity metering unit, wherein a sampling circuit in the control device directly outputs feedback voltage acquired based on a sampling resistor to a first comparator and a second comparator, so that the trigger can directly adjust the working state of the control switch according to the comparison result of the first comparator and the second comparator, thereby adjusting the working state of the oil quantity metering unit, and then when the power supply voltage of the oil quantity metering unit jumps instantaneously, the current flowing through the sampling resistor can be adjusted in time based on the feedback voltage output by the sampling circuit, so as to adjust the working state of the oil quantity metering unit in time, relieve the influence caused by the instantaneous jump of the power supply voltage of the oil quantity metering unit, and the delay of adjustment does not exist, and further the oil quantity metering unit cannot play a role in reaction when the power supply voltage of the oil quantity metering unit is recovered to be normal.
Description
Technical Field
The invention relates to the field of control of oil quantity metering units, in particular to a control device of an oil quantity metering unit.
Background
The electric control high-pressure common rail system is a new-generation green diesel engine fuel system in the 21 st century. It is characterized in that: the actual running state of the engine is detected by various sensors and switches, and the oil injection quantity, the oil injection time, the oil injection pressure, the oil injection rate and the like are optimally controlled after calculation and processing by the electronic control unit.
The oil mass metering unit is an element used for controlling rail pressure by an electric control high-pressure common rail engine, and a valve core of an electromagnetic valve of the oil mass metering unit can generate different strokes under different currents so as to generate different opening degrees, so that the aim of controlling the rail pressure by controlling the oil mass entering a high-pressure oil pump is fulfilled. Specifically, the opening size of the electromagnetic valve of the oil quantity metering unit directly determines the oil quantity entering the high-pressure oil pump, and further has direct influence on the rail pressure control of the common rail pipe of the engine.
When the power supply voltage of the oil quantity metering unit jumps instantaneously, the control device of the oil quantity metering unit of the existing vehicle cannot correct the opening of the electromagnetic valve of the oil quantity metering unit in time, and certain delay exists, so that when the power supply voltage of the oil quantity metering unit jumps instantaneously, the control device of the existing oil quantity metering unit cannot correct the influence of the instantaneous jump of the power supply voltage on the oil quantity metering unit, and can also play a role in reacting when the power supply voltage of the oil quantity metering unit returns to normal.
Disclosure of Invention
In order to solve the above technical problem, an embodiment of the present invention provides a control device for an oil amount metering unit, so as to correct an influence caused by an instantaneous jump of a power supply voltage of the oil amount metering unit, and not to have an adverse effect when the power supply voltage of the oil amount metering unit returns to a normal state.
In order to solve the above problems, the embodiments of the present invention provide the following technical solutions:
a control device of an oil amount metering unit, comprising:
the circuit comprises a singlechip, a first comparator, a second comparator, a trigger, a control switch, a sampling circuit and a sampling resistor;
the first end of the sampling resistor is electrically connected with the control switch, and the second end of the sampling resistor is electrically connected with the oil quantity metering unit;
the sampling circuit is used for collecting the current flowing through the sampling resistor and converting the current into feedback voltage for output;
the singlechip is used for providing a first threshold voltage and a second threshold voltage;
the first comparator is configured to output a first comparison result based on the first threshold voltage and the feedback voltage;
the second comparator is used for outputting a second comparison result based on the second threshold voltage and the feedback voltage;
the trigger is used for controlling the working state of the control switch based on the first comparison result and the second comparison result.
Optionally, the single chip microcomputer obtains the driving current and the driving frequency of the oil amount metering unit based on a working condition of a vehicle engine, and obtains the first threshold voltage and the second threshold voltage of the oil amount metering unit based on the driving current and the driving frequency of the oil amount metering unit.
Optionally, the method further includes:
the first protection element comprises a first resistor and a second resistor, the first end of the first resistor is electrically connected with the first output end of the singlechip, and the second end of the first resistor is electrically connected with the first input end of the first comparator; and the first end of the second resistor is electrically connected with the second output end of the singlechip, and the second end of the second resistor is electrically connected with the first input end of the second comparator.
Optionally, the method further includes:
the second protection element comprises a third resistor and a fourth resistor, wherein the first end of the third resistor is electrically connected with the second input end of the first comparator, and the second end of the third resistor is electrically connected with the output end of the sampling circuit; and the first end of the fourth resistor is electrically connected with the second input end of the second comparator, and the second end of the fourth resistor is electrically connected with the output end of the sampling circuit.
Optionally, the method further includes:
the third protection element comprises a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is electrically connected with the output end of the first comparator, and the second end of the fifth resistor is grounded; and the first end of the sixth resistor is electrically connected with the output end of the second comparator, and the second end of the sixth resistor is grounded.
Optionally, the method further includes: and the fourth protection element comprises a seventh resistor, the first end of the seventh resistor is electrically connected with the output end of the trigger, and the second end of the seventh resistor is electrically connected with the control end of the control switch.
Optionally, the fourth protection element further includes:
and the first end of the first capacitor is electrically connected with the first end of the control switch, and the second end of the first capacitor is electrically connected with the second end of the control switch.
Optionally, the method further includes:
and the fifth protection element comprises a freewheeling diode, the first end of the freewheeling diode is electrically connected with the first end of the control switch, and the second end of the freewheeling diode is electrically connected with the power supply voltage end of the oil quantity metering unit.
Optionally, the sampling circuit comprises a current sensor.
Optionally, the sampling circuit further includes:
the voltage division element comprises an eighth resistor and a ninth resistor which are connected in series, the first end of the eighth resistor is electrically connected with the output end of the current sensor, the second end of the eighth resistor is electrically connected with the first end of the ninth resistor, the second end of the ninth resistor is grounded, and the common end of the eighth resistor and the ninth resistor is used as the output end of the sampling circuit.
Compared with the prior art, the technical scheme has the following advantages:
in the control device of the oil quantity metering unit provided by the embodiment of the invention, only the single chip microcomputer is required to provide the first threshold voltage and the second threshold voltage, and the first comparator is used for comparing the feedback voltage output by the sampling circuit with the first threshold voltage to output the first comparison result, and the second comparator is used for comparing the feedback voltage output by the sampling circuit with the second threshold voltage to output the second comparison result, so that the trigger controls the working state of the control switch according to the first comparison result and the second comparison result, namely, the control device of the oil quantity metering unit provided by the embodiment of the invention utilizes the sampling circuit to directly output the feedback voltage acquired based on the sampling resistor to the first comparator and the second comparator, so that the trigger can directly adjust the working state of the control switch according to the comparison results of the first comparator and the second comparator, therefore, the working state of the oil quantity metering unit is adjusted, the singlechip is not required to calculate the fed-back voltage to obtain the driving frequency and the duty ratio of the oil quantity metering unit, and the calculation time is saved. Therefore, the oil mass metering unit controlling means that this application embodiment provided, when the instantaneous jump of oil mass metering unit's supply voltage, can in time adjust the operating condition of oil mass metering unit to alleviate the influence that the instantaneous jump of oil mass metering unit's supply voltage arouses, there is not the delay of regulation, and then can not be in the supply voltage of oil mass metering unit plays the counteraction when recovering normally, has improved this controlling means to the control accuracy of oil mass metering unit, makes the interference killing feature reinforcing of oil mass metering unit.
Moreover, the controlling means of oil mass metering unit that this application embodiment provided, based on sampling circuit first comparator the second comparator with the hardware architecture control that the trigger is constituteed control switch's operating condition, in order to adjust oil mass metering unit's operating condition need not the singlechip and calculates the drive frequency and the duty cycle that obtain oil mass metering unit with the voltage of feedback again to the software resource of singlechip has been practiced thrift.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a control device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another control device provided in the embodiment of the present application;
fig. 3 is a schematic diagram illustrating a variation curve of a current flowing through a sampling resistor when the control device is in operation according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another control device provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of another control device according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another control device provided in the embodiment of the present application;
fig. 7 is a schematic structural diagram of another control device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
Next, the present application will be described in detail with reference to the drawings, and in the detailed description of the embodiments of the present application, the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration, and the drawings are only examples, which should not limit the scope of the protection of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
As described in the background section, when the supply voltage of the oil quantity measuring unit instantaneously jumps, the control device of the conventional oil quantity measuring unit cannot correct the influence of the instantaneous jump of the supply voltage on the oil quantity measuring unit, and can also play a role in counteracting when the supply voltage of the oil quantity measuring unit returns to normal.
The inventor researches and finds that the reason is that the control process of the control device of the prior oil quantity metering unit is as follows: the single chip microcomputer obtains an average current value of the oil quantity metering unit according to the working condition of an engine, and then the average current value is converted into a driving frequency and a duty ratio of the oil quantity metering unit, so that the opening of an electromagnetic valve of the oil quantity metering unit connected with the sampling circuit is controlled based on the driving frequency and the duty ratio.
However, due to the limitation of the calculation speed of the single-chip microcomputer, that is, the period of each single-chip microcomputer calculating the driving frequency and the duty ratio of the oil quantity metering unit is relatively long, when the supply voltage of the oil quantity metering unit jumps instantaneously, the sampling circuit outputs a first feedback current, the single-chip microcomputer can only correct the driving frequency and the duty ratio required when the oil quantity metering unit works in the second period based on the first feedback current (that is, the feedback current corresponding to the oil quantity metering unit working in the first period) after receiving the first feedback current, and then control the working state of the oil quantity metering unit in the second period based on the corrected driving frequency and the duty ratio, so that the conventional control device has a time delay when adjusting the working state of the oil quantity metering unit based on the feedback current output by the sampling circuit, and cannot adjust the working state of the oil quantity metering unit in the working period (that is, the first period) corresponding to the feedback current, and further cannot correct the influence caused by the instantaneous jump of the power supply voltage in time.
And because the power supply voltage of the oil quantity metering unit jumps instantly usually, when the next working cycle of the oil quantity metering unit is started, the power supply voltage of the oil quantity metering unit may be recovered to be normal, so that when the driving frequency and the duty ratio required by the oil quantity metering unit to work in the second cycle are corrected based on the feedback current of the oil quantity metering unit working in the first cycle, the corrected driving frequency and the corrected duty ratio are deviated from the driving frequency and the duty ratio actually required by the oil quantity metering unit instead, and the adverse effect is achieved.
It should be noted that, in this embodiment of the application, the single chip microcomputer is output in a cyclic manner by taking a calculation cycle as a unit when calculating the driving frequency and the duty cycle required by the operation of the oil amount measuring unit, in the above description, the oil amount measuring unit operates under the driving frequency and the duty cycle output by the first calculation cycle of the single chip microcomputer, and is recorded as the operation of the oil amount measuring unit in the first cycle, the oil amount measuring unit operates under the driving frequency and the duty cycle output by the second calculation cycle of the single chip microcomputer, and is recorded as the operation of the oil amount measuring unit in the second cycle, wherein the first calculation cycle and the second calculation cycle are two adjacent calculation cycles in the single chip microcomputer, and the execution time of the second calculation cycle is later than the calculation time of the first calculation cycle.
Therefore, the control device of the existing oil quantity metering unit can not correct the influence caused by the instantaneous jump of the power supply voltage of the control device, and can also play a role in reacting when the power supply voltage of the control device is recovered to be normal, namely the control device has low control precision on the oil quantity metering unit, so that the anti-interference capability of the oil quantity metering unit is poor.
Based on the above research, an embodiment of the present application provides a control device for an oil amount metering unit, as shown in fig. 1, the control device includes:
the circuit comprises a singlechip 100, a first comparator 201, a second comparator 202, a trigger 300, a control switch 400, a sampling circuit 500 and a sampling resistor 600;
a first end of the sampling resistor 600 is electrically connected to the control switch 400, a second end of the sampling resistor 600 is electrically connected to the oil amount metering unit 700, one end of the oil amount metering unit 700 away from the sampling resistor 600 is electrically connected to a power supply voltage end VDD of the oil amount metering unit 700, and optionally, the power supply voltage end of the oil amount metering unit 700 shares a power supply end of the vehicle controller;
the sampling circuit 500 is configured to collect a current flowing through the sampling resistor 600 and convert the current into a feedback voltage for output, and specifically, a first input terminal of the sampling circuit 500 is electrically connected to a first terminal of the sampling resistor 600, a second input terminal of the sampling circuit 500 is electrically connected to a second terminal of the sampling resistor 600, and an output terminal of the sampling circuit 500 is electrically connected to the first comparator 201 and the second comparator 202, and is configured to collect a current flowing through the sampling resistor 600 and convert the current into a feedback voltage for output to the first comparator 201 and the second comparator 202;
the single chip microcomputer 100 is used for providing a first threshold voltage and a second threshold voltage;
the first comparator 201 is configured to output a first comparison result based on the first threshold voltage and the feedback voltage, and specifically, a first input end of the first comparator 201 is electrically connected to the single chip microcomputer 100, a second input end of the first comparator 201 is electrically connected to an output end of the sampling circuit 500, and an output end of the first comparator is electrically connected to the flip-flop 300, and is configured to output the first comparison result to the flip-flop 300 based on the first threshold voltage and the feedback voltage;
the second comparator 202 is configured to output a second comparison result based on the second threshold voltage and the feedback voltage, specifically, a first input end of the second comparator 202 is electrically connected to the single chip microcomputer 100, a second input end of the second comparator 202 is electrically connected to an output end of the sampling circuit 500, and an output end of the second comparator 202 is electrically connected to the flip-flop 300, and is configured to output the first comparison result to the flip-flop 300 based on the second threshold voltage and the feedback voltage;
the flip-flop 300 is configured to control an operating state of the control switch 400 based on the first comparison result and the second comparison result, specifically, a first input end of the flip-flop 300 is electrically connected to an output end of the first comparator 201, a second input end of the flip-flop 300 is electrically connected to an output end of the second comparator 202, and an output end of the flip-flop 300 is electrically connected to the control switch 400, and is configured to control the operating state of the control switch 400 based on the first comparison result output by the first comparator 201 and the second comparison result output by the second comparator 202, so as to control an opening degree of the solenoid valve in the oil amount metering unit 700, optionally, the operating state of the control switch 400 includes an on state and an off state.
Optionally, the control switch is a triode, specifically, the control switch is a P-type MOS transistor or an N-type MOS transistor, in an embodiment of the present application, the model of the control switch is 2N6755, in other embodiments of the present application, the control switch may also be another model, which is not limited in this application, and is specifically determined according to the situation.
Optionally, the oil amount metering unit includes a proportional solenoid valve, which is applied to the oil pump.
Optionally, in an embodiment of the present application, the first comparator and the second comparator may be the same in model or different in model, specifically, the first comparator and the second comparator are TL081 in model, and in other embodiments of the present application, the first comparator and the second comparator may also be in other models, which is not limited in this application and is determined as the case may be.
Optionally, in an embodiment of the present application, the type of the flip-flop is SN74HC74, and in other embodiments of the present application, the flip-flop may also be another type, which is not limited in this application, as the case may be.
It should be noted that the first threshold voltage and the second threshold voltage are respectively output by a first output end and a second output end of a DAC (i.e., a Digital-to-analog converter) module of the single chip microcomputer, specifically, in an embodiment of the present application, the first output end of the DAC module of the single chip microcomputer outputs the first threshold voltage, and the second output end of the DAC module of the single chip microcomputer outputs the second threshold voltage, in another embodiment of the present application, the first output end of the DAC module of the single chip microcomputer outputs the second threshold voltage, and the second output end of the DAC module of the single chip microcomputer outputs the first threshold voltage.
It should be further noted that, one of the first threshold voltage and the second threshold voltage is an upper limit voltage DAC _ H of the oil amount metering unit, and the other is a lower limit voltage DAC _ L of the oil amount metering unit, where the upper limit voltage DAC _ H of the oil amount metering unit is greater than the lower limit voltage DAC _ L of the oil amount metering unit, specifically, in an embodiment of the present application, the first threshold voltage is the upper limit voltage DAC _ H, and the second threshold voltage is the lower limit voltage DAC _ L, in another embodiment of the present application, the first threshold voltage is the lower limit voltage DAC _ L, and the second threshold voltage is the upper limit voltage DAC _ H. Next, the control device of the oil amount measuring unit will be described by taking the first threshold voltage as the upper limit voltage DAC _ H and the second threshold voltage as the lower limit voltage DAC _ L as an example.
Specifically, as shown in fig. 2, the connection relationship of the control device is as follows: the first output end of the single chip microcomputer 100 is electrically connected to the first input end (i.e. positive input end) of the first comparator 201, the second output end of the single chip microcomputer 100 is electrically connected to the first input end (i.e. positive input end) of the second comparator 202, the output end of the sampling circuit 500 is electrically connected to the second input end (i.e. negative input end) of the first comparator 201 and the second input end (i.e. negative input end) of the second comparator 202, respectively, the output end of the first comparator 201 is electrically connected to the first input end of the trigger 300, the output end of the second comparator 202 is electrically connected to the second input end and the third input end of the trigger 300, respectively, the output end of the trigger 300 is electrically connected to the control end of the control switch 400, the first end of the control switch 400 is simultaneously electrically connected to the first end of the sampling resistor 600 and the first input end of the sampling circuit 500, the second end of, the second end of the sampling resistor 600 deviates from the oil amount metering unit 700, and the one end of the power supply voltage end of the oil amount metering unit 700 is electrically connected, and meanwhile, the second end of the sampling resistor 600 is also electrically connected with the second input end of the sampling circuit 500.
The working process of the control device comprises the following steps: when the feedback voltage is greater than the first threshold voltage, a first comparison result output by the first comparator and a second comparison result output by the second comparator are both high levels, and the trigger controls the control switch to be in a cut-off state according to the first comparison result and the second comparison result and disconnects a path between a power supply voltage end and a grounding end of the oil quantity metering unit; when the feedback voltage is smaller than the second threshold voltage, a first comparison result output by the first comparator and a second comparison result output by the second comparator are both low levels, and the trigger controls the control switch to be in a conducting state according to the first comparison result and the second comparison result, so that a path between a power supply voltage end and a grounding end of the oil quantity metering unit is conducted; when the feedback voltage is smaller than the first threshold voltage and larger than the second threshold voltage, the first comparison result output by the first comparator is a low level, the second comparison result output by the second comparator is a high level, and the trigger controls the control switch to maintain the current working state according to the first comparison result and the second comparison result, namely, if the current working state of the control switch is a conducting state, the trigger controls the control switch to maintain the conducting state, and if the current working state of the control switch is a cut-off state, the trigger controls the control switch to maintain the cut-off state. It should be noted that, in the embodiment of the present application, the first comparator 201 further includes a first power supply terminal and a second power supply terminal, where the first power supply terminal of the first comparator 201 is connected to a high potential, and the second power supply terminal of the first comparator 201 is grounded; similarly, the second comparator 202 also includes a first power supply terminal and a second power supply terminal, wherein the first power supply terminal of the second comparator 202 is connected to a high potential, and the second power supply terminal of the second comparator 202 is grounded, and optionally, the second power supply terminal of the first comparator 201 and the second power supply terminal of the second comparator 202 are electrically connected to the same ground terminal.
It should be further noted that the sampling circuit 500 also includes a first power supply terminal and a second power supply terminal, where the first power supply terminal of the sampling circuit 500 is connected to a high potential, and the second power supply terminal of the sampling circuit 500 is grounded.
In addition, it should be noted that the flip-flop 300 further includes a power supply terminal for receiving a high potential, optionally, the voltage of the power supply terminal of the flip-flop 300 receiving the high potential is 6.5V, and in other embodiments of the present application, the voltage of the power supply terminal of the flip-flop 300 receiving the high potential may also be other values.
As can be seen from the above, in the control device of the oil amount metering unit provided in the embodiment of the present application, only the single chip microcomputer needs to provide the first threshold voltage and the second threshold voltage, and the remaining part is compared by the first comparator according to the feedback voltage output by the sampling circuit and the first threshold voltage to output the first comparison result, and the remaining part is compared by the second comparator according to the feedback voltage output by the sampling circuit and the second threshold voltage to output the second comparison result, so that the trigger controls the operating state of the control switch according to the first comparison result and the second comparison result, that is, the control device of the oil amount metering unit provided in the embodiment of the present application utilizes the sampling circuit to directly output the feedback voltage acquired based on the sampling resistor to the first comparator and the second comparator, so that the trigger can directly adjust the operating state of the control switch according to the comparison result of the first comparator and the second comparator, and then adjust the operating condition of oil mass metering unit, and need not the singlechip and calculate the drive frequency and the duty cycle that obtain oil mass metering unit with the voltage of feeding back again, saved the calculation time.
Therefore, the oil mass metering unit controlling means that this application embodiment provided, when the instantaneous jump of oil mass metering unit's supply voltage, can in time adjust the operating condition of oil mass metering unit to alleviate the influence that the instantaneous jump of oil mass metering unit's supply voltage arouses, there is not the delay of regulation, and then can not be in the supply voltage of oil mass metering unit plays the counteraction when recovering normally, has improved this controlling means to the control accuracy of oil mass metering unit, makes the interference killing feature reinforcing of oil mass metering unit.
Moreover, the controlling means of oil mass metering unit that this application embodiment provided, based on sampling circuit first comparator the second comparator with the hardware architecture control that the trigger is constituteed control switch's operating condition, in order to adjust oil mass metering unit's operating condition need not the singlechip and calculates the drive frequency and the duty cycle that obtain oil mass metering unit with the voltage of feedback again to the software resource of singlechip has been practiced thrift.
In addition, in the control device of the oil quantity metering unit provided by the embodiment of the application, the sampling circuit converts the collected current into the feedback voltage and outputs the feedback voltage to the first comparator and the second comparator, and then the trigger controls the working state of the control switch according to the comparison result output by the first comparator and the second comparator, so that an expensive filter chip is not needed, the collected current is converted into the average current and is fed back to the single chip microcomputer, and the manufacturing cost of the control device in the application is reduced.
As shown in fig. 3, when the vehicle controller is just powered on, the trigger controls the control switch to be in the on state, so that the current flowing through the sampling resistor (i.e. the current flowing through the oil amount metering unit) increases in a short time from 0A, when the current flowing through the sampling resistor reaches the upper limit value H of the current, the trigger controls the control switch to be in the off state, so that the current flowing through the sampling resistor (i.e. the current flowing through the oil amount metering unit) decreases in a short time, when the current flowing through the sampling resistor reaches the lower limit value L of the current, the trigger controls the control switch to be in the on state again, so that the current flowing through the sampling resistor (i.e. the current flowing through the oil amount metering unit) increases in a short time, that is, when the control device is in a normal working state, the current flowing through the sampling resistor (namely the current flowing through the oil quantity metering unit) can be accurately controlled to circularly change between the upper limit value H of the current and the lower limit value L of the current, so that the control device can timely adjust the working current (namely the working state) of the oil quantity metering unit to relieve the influence caused by the instantaneous jump of the power supply voltage of the oil quantity metering unit. In one embodiment of the present application, the upper limit value of the current flowing through the sampling resistor is 3A, and the lower limit value of the current flowing through the sampling resistor is 2A.
On the basis of any one of the above embodiments, in an embodiment of the present application, a manner of obtaining the first threshold voltage and the second threshold voltage by the single chip microcomputer includes: the single chip microcomputer obtains the driving current and the driving frequency of the oil quantity metering unit based on the working condition of a vehicle engine, obtains the first threshold voltage and the second threshold voltage of the oil quantity metering unit based on the driving current and the driving frequency of the oil quantity metering unit, specifically, the single chip microcomputer obtains the driving current and the driving frequency of the oil quantity metering unit based on the working condition of the vehicle engine, calculates and obtains the first threshold current and the second threshold current of the oil quantity metering unit based on the driving current and the driving frequency of the oil quantity metering unit, and obtains the first threshold voltage corresponding to the first threshold current and the second threshold voltage corresponding to the second threshold current through table lookup. It should be noted that, since the operating current of the oil amount metering unit is not a constant value, in an embodiment of the present application, optionally, the driving current of the oil amount metering unit is an average current of the oil amount metering unit.
On the basis of any one of the above embodiments, in an embodiment of the present application, as shown in fig. 4, the control device further includes: a first protection element, which includes a first resistor 101 and a second resistor 102, where the first resistor 101 is located between the single chip microcomputer 100 and the first comparator 201, specifically, a first end of the first resistor 101 is electrically connected to a first output end of the single chip microcomputer 100, and a second end of the first resistor 101 is electrically connected to a first input end of the first comparator 201, so as to prevent the first comparator 201 from being damaged due to an excessive current between the first output end of the single chip microcomputer 100 and the first input end of the first comparator 201, thereby protecting the first comparator 201; the second protection resistor 102 is located between the single chip microcomputer 100 and the second comparator 202, specifically, a first end of the second resistor 102 is electrically connected to the second output end of the single chip microcomputer 100, and a second end of the second resistor 102 is electrically connected to the first input end of the second comparator 202, so as to prevent the second comparator 202 from being damaged due to an excessive current between the second output end of the single chip microcomputer 100 and the first input end of the second comparator 202, thereby protecting the second comparator 202.
On the basis of the foregoing embodiment, in an embodiment of the present application, a value of the first resistor 101 may be 3K Ω, and a value of the second resistor 102 may be 3K Ω, and in other embodiments of the present application, values of the first resistor 101 and the second resistor 102 may also be other values.
On the basis of any of the above embodiments, in an embodiment of the present application, as shown in fig. 4, the control device further includes: a second protection element, which includes a third resistor 203 and a fourth resistor 204, where the third resistor 203 is located between the first comparator 201 and the sampling circuit 500, specifically, a first end of the third resistor 203 is electrically connected to a second input end of the first comparator 201, and a second end is electrically connected to an output end of the sampling circuit 500, so as to prevent the first comparator 201 from being damaged due to an excessive current between the output end of the sampling circuit 500 and the second input end of the first comparator 201, thereby protecting the first comparator 201; the fourth resistor 204 is located between the second comparator 202 and the sampling circuit 500, and specifically, a first end of the fourth resistor 204 is electrically connected to a second input end of the second comparator 202, and a second end of the fourth resistor 204 is electrically connected to an output end of the sampling circuit 500, so as to prevent the second comparator 202 from being damaged due to an excessive current between the output end of the sampling circuit 500 and the second input end of the second comparator 202, thereby protecting the second comparator 202.
On the basis of the foregoing embodiment, in an embodiment of the present application, a value of the third resistor 203 may be 3K Ω, and a value of the fourth resistor 204 may be 3K Ω, and in other embodiments of the present application, values of the third resistor 203 and the fourth resistor 204 may also be other values.
It should be noted that, in the above control device, the output end of the first comparator is directly electrically connected to the first input end of the flip-flop, and the output end of the second comparator is directly electrically connected to the second input end of the flip-flop, so that when the vehicle controller is just powered on, the control device is easy to enable both the first comparator and the second comparator to output a high level, so that the flip-flop in the control device controls the control switch to be in the off state according to the output results of the first comparator and the second comparator, and the oil amount metering unit cannot be immediately started.
In view of the above problem, in an embodiment of the present application, on the basis of any one of the above embodiments, as shown in fig. 4, the control device further includes: a third protection element, which includes a fifth resistor 301 and a sixth resistor 302, wherein a first end of the fifth resistor 301 is electrically connected to the output end of the first comparator 201, that is, electrically connected to the common end of the first comparator 201 and the trigger 300, and a second end is grounded, so that a fixed low level can be input to the first input end of the trigger 300 when the vehicle controller is just powered on, and the output end of the first comparator 201 is prevented from outputting a high level when the vehicle ECU controller is just powered on; the first end of the sixth resistor 302 is electrically connected to the output end of the second comparator 202, that is, the common end of the second comparator 202 and the flip-flop 300 is electrically connected, and the second end is grounded, so that a fixed low level can be input to the second input end of the flip-flop 300 when the vehicle controller is just powered on, and the output end of the second comparator 202 is prevented from outputting a high level when the vehicle controller is just powered on, and the control switch 400 is controlled by mistake to be in a cut-off state.
On the basis of the foregoing embodiment, in an embodiment of the present application, a value of the fifth resistor 301 may be 47K Ω, and a value of the sixth resistor 302 may be 47K Ω, and in other embodiments of the present application, values of the fifth resistor 301 and the sixth resistor 302 may also be other values.
On the basis of any of the above embodiments, in an embodiment of the present application, as shown in fig. 4, the control device further includes: the fourth protection element is located between the trigger 300 and the control switch 400, and specifically, the fourth protection element includes a seventh resistor 401, a first end of the seventh resistor 401 is electrically connected to the output end of the trigger 300, and a second end of the seventh resistor 401 is electrically connected to the control end of the control switch 400, so as to prevent an excessive current output between the trigger 300 and the control switch 400, so that the excessive current input to the control end of the control switch 400 causes the control switch 400 to oscillate, and thus, the effect of maintaining the stable operation of the control switch 400 can be achieved.
On the basis of the foregoing embodiment, in an embodiment of the present application, a value of the seventh resistor 401 may be 4.7K Ω, and in other embodiments of the present application, a value of the seventh resistor 401 may also be other values.
On the basis of the above embodiments, in an embodiment of the present application, as shown in fig. 5, the fourth protection element further includes an interface circuit 800, the interface circuit 800 is located between the flip-flop 300 and the seventh resistor 401, specifically, an input end of the interface circuit 800 is electrically connected to an output end of the flip-flop 300, and an output end of the interface circuit is electrically connected to a first end of the seventh resistor 401, and is used for matching impedance between the flip-flop 300 and the control switch 400, so as to play a role in buffering current between the flip-flop 300 and the control switch 400, thereby enhancing driving capability of the control switch 400, and improving stability of the control switch 400, so as to improve reliability of the control device. However, the present application is not limited thereto, as the case may be.
On the basis of any of the above embodiments, in an embodiment of the present application, as shown in fig. 5, the fourth protection element further includes: the first capacitor 402 is connected in parallel with the control switch, a first end of the first capacitor 402 is electrically connected to a first end of the control switch 400, a second end of the first capacitor 402 is electrically connected to a second end of the control switch 400, the first end of the control switch 400 is electrically connected to a first end of the sampling resistor 600, the second end of the control switch 400 is grounded, that is, the first end of the first capacitor 402 is electrically connected to a common terminal of the control switch 400 and the sampling resistor 600, and the second end of the first capacitor is electrically connected to a common terminal of the control switch 400 and a ground terminal, so as to filter self-excited oscillation generated at the moment when the control switch 400 is turned on or turned off, thereby ensuring stable operation of the control switch 400, and specifically, the first capacitor 402 is a filter capacitor.
On the basis of the foregoing embodiment, in an embodiment of the present application, a value of the first capacitor 402 may be 100nf, and in other embodiments of the present application, a value of the first capacitor 402 may also be other values.
On the basis of the foregoing embodiment, in an embodiment of the present application, the resistance value of the sampling resistor 600 may be 100m Ω, and in other embodiments of the present application, the value of the sampling resistor 600 may also be other values, which is not limited in the present application and is determined as the case may be.
It should be noted that, the oil quantity metering unit includes a proportional solenoid valve, and because a relay is arranged in the proportional solenoid valve, when the current flowing through the relay suddenly jumps, an induced voltage is generated across the relay, so that other elements in the control device may be damaged.
In view of the above problem, in an embodiment of the present application, on the basis of any one of the above embodiments, as shown in fig. 5, the control device further includes: the fifth protection element is located between the common end of the control switch 400 and the sampling resistor 600 and the common end of the oil amount metering unit 700 and the power supply voltage end VDD, specifically, the fifth protection element includes a freewheeling diode 601, the freewheeling diode 601 is connected in parallel with the oil amount metering unit 700, wherein the first end of the freewheeling diode 601 is electrically connected with the common end of the control switch 400 and the sampling resistor 600, and the second end is electrically connected with the power supply voltage end VDD of the oil amount metering unit 700, so that when the voltage of the power supply voltage end VDD of the oil amount metering unit 700 changes suddenly, a path is provided, and particularly, when the control switch 400 is turned off, the freewheeling diode can release the energy stored by the relay of the oil amount metering unit 700, thereby preventing the induction voltage from being too high and breaking down the control switch 400.
On the basis of the foregoing embodiment, in an embodiment of the present application, the model of the freewheeling diode 601 is 1N1183, and in other embodiments of the present application, the freewheeling diode 601 may also be of other models, which is not limited in this application, and is determined as the case may be.
On the basis of any of the above embodiments, in an embodiment of the present application, as shown in fig. 6, the sampling circuit includes a current sensor 501, specifically, a first input terminal of the current sensor 501 is electrically connected to the common terminal of the control switch 400 and the sampling resistor 600, a second input terminal of the current sensor 501 is electrically connected to a second terminal of the sampling resistor 600, an output terminal of the sampling circuit is electrically connected to the first comparator and the second comparator, a first power supply terminal of the current sensor 501 is connected to a high level, and a second power supply terminal of the current sensor 501 is connected to a ground. It should be noted that, the types of the current sensors 501 are different, and the amplification factors of the voltages at the two ends of the sampling resistor 600 are different, where the amplification factor of the current sensor 501 is not less than 1, which is not limited in this application, and is determined as the case may be. Optionally, the type of the current sensor 501 is 1NA193, and in other embodiments of the present application, the current sensor 501 may also be of other types, which is not limited in the present application and is determined as the case may be.
It should be further noted that, in the embodiment of the present application, if the amplification factor of the current sensor 501 is equal to 1, the output terminal of the current sensor 501 is directly used as the output terminal of the sampling circuit, that is, the feedback voltage output by the sampling circuit is equal to the voltage across the sampling resistor 600, so that the circuit structure of the control device is simplified.
In another embodiment of the present application, as shown in fig. 7, if the amplification factor of the current sensor 501 is greater than 1, the sampling circuit 500 further includes: the voltage dividing element comprises an eighth resistor 502 and a ninth resistor 503 which are connected in series, a first end of the eighth resistor 502 is electrically connected with the output end of the current sensor 501, a second end of the eighth resistor 502 is electrically connected with a first end of the ninth resistor 503, a second end of the ninth resistor 503 is grounded, and a common end of the eighth resistor 502 and the ninth resistor 503 is used as an output end of the sampling circuit, so that a feedback voltage output by the sampling circuit is equal to a voltage across the sampling resistor 600, and accuracy of comparison results output by the first comparator and the second comparator is guaranteed.
It should be noted that a ratio of the eighth resistor and the ninth resistor is determined by an amplification factor of the current sensor to the voltage across the sampling resistor, where a feedback voltage input to the second input terminal of the first comparator is a voltage at a common terminal of the eighth resistor and the ninth resistor, that is, a voltage across the ninth resistor, for example, an amplification factor of the current sensor to the voltage across the sampling resistor is 2, and then a ratio of the eighth resistor and the ninth resistor is 1, that is, the eighth resistor and the ninth resistor divide the voltage output by the sampling circuit equally, so that the feedback voltage input to the second input terminal of the first comparator is the voltage across the sampling resistor, specifically, a value of the eighth resistor may be 1K Ω, a value of the ninth resistor may be 1K Ω, and in other embodiments of the present application, values of the eighth resistor and the ninth resistor may be other values, the present application is not limited thereto, as the case may be.
In the control device of oil mass metering unit that this application embodiment provided, can be based on the current of sampling resistance is in time adjusted to the feedback voltage of sampling circuit output, and then control oil mass metering unit's aperture to when the instantaneous jump of oil mass metering unit's supply voltage, can in time adjust oil mass metering unit's operating condition to alleviate the influence that the instantaneous jump of oil mass metering unit's supply voltage arouses, there is not the delay of regulation, and then can not the supply voltage of oil mass metering unit resumes to play the counteraction when normal, has improved this control device to oil mass metering unit's control accuracy, makes oil mass metering unit's anti-interference ability reinforcing.
Moreover, the controlling means of oil mass metering unit that this application embodiment provided, based on sampling circuit first comparator the second comparator with the hardware architecture control that the trigger is constituteed control switch's operating condition, in order to adjust oil mass metering unit's operating condition need not the singlechip and calculates the drive frequency and the duty cycle that obtain oil mass metering unit with the voltage of feedback again to the software resource of singlechip has been practiced thrift.
In addition, in the control device of the oil quantity metering unit provided by the embodiment of the application, the sampling circuit converts the collected current into the feedback voltage and outputs the feedback voltage to the first comparator and the second comparator, and then the trigger controls the working state of the control switch according to the comparison result output by the first comparator and the second comparator, so that an expensive filter chip is not needed, the collected current is converted into the average current and is fed back to the single chip microcomputer, and the manufacturing cost of the control device in the application is reduced.
In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A control device of an oil amount measuring unit, characterized by comprising:
the circuit comprises a singlechip, a first comparator, a second comparator, a trigger, a control switch, a sampling circuit and a sampling resistor;
the first end of the sampling resistor is electrically connected with the control switch, and the second end of the sampling resistor is electrically connected with the oil quantity metering unit; the sampling circuit is used for collecting the current flowing through the sampling resistor and converting the current into feedback voltage for output;
the singlechip is used for providing a first threshold voltage and a second threshold voltage;
the single chip microcomputer obtains the driving current and the driving frequency of the oil quantity metering unit based on the working condition of a vehicle engine, and obtains a first threshold voltage and a second threshold voltage of the oil quantity metering unit based on the driving current and the driving frequency of the oil quantity metering unit;
the first threshold voltage is the upper limit voltage of the oil quantity metering unit, and the second threshold voltage is the lower limit voltage of the oil quantity metering unit;
the first comparator is configured to output a first comparison result based on the first threshold voltage and the feedback voltage;
the feedback voltage is greater than the first threshold voltage, and the first comparison result is a high level;
the feedback voltage is smaller than the first threshold voltage, and the first comparison result is a low level;
the second comparator is used for outputting a second comparison result based on the second threshold voltage and the feedback voltage;
the feedback voltage is greater than the second threshold voltage, and the second comparison result is a high level;
the feedback voltage is smaller than the second threshold voltage, and the second comparison result is a low level;
the trigger is used for controlling the working state of the control switch based on the first comparison result and the second comparison result;
when the first comparison result and the second comparison result are both high levels, the trigger controls the control switch to be in a cut-off state;
when the first comparison result and the second comparison result are both low levels, the trigger controls the control switch to be in a conducting state;
and when the first comparison result is a low level and the second comparison result is a high level, the trigger controls the control switch to maintain the current working state.
2. The control apparatus according to claim 1, further comprising:
the first protection element comprises a first resistor and a second resistor, the first end of the first resistor is electrically connected with the first output end of the singlechip, and the second end of the first resistor is electrically connected with the first input end of the first comparator; and the first end of the second resistor is electrically connected with the second output end of the singlechip, and the second end of the second resistor is electrically connected with the first input end of the second comparator.
3. The control apparatus according to claim 2, further comprising:
the second protection element comprises a third resistor and a fourth resistor, wherein the first end of the third resistor is electrically connected with the second input end of the first comparator, and the second end of the third resistor is electrically connected with the output end of the sampling circuit; and the first end of the fourth resistor is electrically connected with the second input end of the second comparator, and the second end of the fourth resistor is electrically connected with the output end of the sampling circuit.
4. The control apparatus according to claim 3, further comprising:
the third protection element comprises a fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is electrically connected with the output end of the first comparator, and the second end of the fifth resistor is grounded; and the first end of the sixth resistor is electrically connected with the output end of the second comparator, and the second end of the sixth resistor is grounded.
5. The control apparatus according to claim 4, further comprising: and the fourth protection element comprises a seventh resistor, the first end of the seventh resistor is electrically connected with the output end of the trigger, and the second end of the seventh resistor is electrically connected with the control end of the control switch.
6. The control device of claim 5, wherein the fourth protection element further comprises:
and the first end of the first capacitor is electrically connected with the first end of the control switch, and the second end of the first capacitor is electrically connected with the second end of the control switch.
7. The control apparatus according to claim 6, further comprising:
and the fifth protection element comprises a freewheeling diode, the first end of the freewheeling diode is electrically connected with the first end of the control switch, and the second end of the freewheeling diode is electrically connected with the power supply voltage end of the oil quantity metering unit.
8. The control device of claim 7, wherein the sampling circuit comprises a current sensor.
9. The control device of claim 8, wherein the sampling circuit further comprises:
the voltage division element comprises an eighth resistor and a ninth resistor which are connected in series, the first end of the eighth resistor is electrically connected with the output end of the current sensor, the second end of the eighth resistor is electrically connected with the first end of the ninth resistor, the second end of the ninth resistor is grounded, and the common end of the eighth resistor and the ninth resistor is used as the output end of the sampling circuit.
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| CN201910578036.0A CN110243606B (en) | 2019-06-28 | 2019-06-28 | Control device of oil quantity metering unit |
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