CN110307108B - Auxiliary control method, auxiliary control device and auxiliary control system of oil injector - Google Patents
Auxiliary control method, auxiliary control device and auxiliary control system of oil injector Download PDFInfo
- Publication number
- CN110307108B CN110307108B CN201910581096.8A CN201910581096A CN110307108B CN 110307108 B CN110307108 B CN 110307108B CN 201910581096 A CN201910581096 A CN 201910581096A CN 110307108 B CN110307108 B CN 110307108B
- Authority
- CN
- China
- Prior art keywords
- voltage
- threshold
- signal
- processing circuit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The application discloses an auxiliary control method, an auxiliary control device and an auxiliary control system of an oil sprayer, wherein a sampling resistor is connected in series in a high-side driving circuit of the oil sprayer, voltage values at two ends of the sampling resistor are used as control basis, if the voltage values at two ends of the sampling resistor are higher than a first voltage threshold value and the state duration reaches a first time threshold value, or if the voltage values at two ends of the sampling resistor are higher than a second voltage threshold value and the state duration reaches a second time threshold value, an error instruction sent by an oil injection chip is determined, and a switching tube in the oil sprayer driving circuit is closed by closing the oil injection chip, so that the oil sprayer driving circuit is protected. Based on the scheme disclosed by the application, when the oil injection chip sends out an error command, the oil injector driving circuit can be protected, and the possibility that the oil injector driving circuit is damaged is reduced.
Description
Technical Field
The application belongs to the technical field of engines, and particularly relates to an auxiliary control method, an auxiliary control device and an auxiliary control system of an oil sprayer.
Background
The fuel injector is an important part in an engine, and the fuel injector control circuit is an execution circuit for directly controlling the fuel injector to work. The basic function of the fuel injector control circuit is to control the opening and closing of the fuel injector and determine the fuel injection rule.
Fig. 1 shows a basic structure of an injector control circuit, which includes a single chip microcomputer, an injection chip, and an injector drive circuit. Fig. 2 shows the basic structure of the injector driving circuit, the switching tube Q1 and the switching tube Q2 are located in the high side driving circuit of the injector, and the switching tube Q3 and the switching tube Q4 are located in the low side driving circuit of the injector. The single chip microcomputer sends a command to the oil injection chip, and the oil injection chip controls the opening and closing of the oil injector driving circuit according to the command sent by the single chip microcomputer, particularly controls the conduction and the closing of each switch tube in the oil injector driving circuit, so that the control of the current of the oil injector is realized. In a normal state, the current waveform of the injector is shown in fig. 3, where Peak is the opening current of the injector, and Hold is the holding current of the injector.
However, the applicant has found that the likelihood of damage to the injector drive circuit is currently high.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an auxiliary control method, an auxiliary control device, and an auxiliary control system for an injector, which can protect an injector driving circuit and reduce the possibility of damage to the injector driving circuit.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides an auxiliary control method of an oil sprayer, wherein a sampling resistor is connected in series in a high-side driving circuit of the oil sprayer, and the method comprises the following steps:
obtaining voltage signals at two ends of the sampling resistor;
judging whether the voltage signal meets at least one of a first condition and a second condition; wherein the first condition is: the voltage value of the voltage signal is higher than a first voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the first voltage threshold reaches a first time threshold; the second condition is: the voltage value of the voltage signal is higher than a second voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the second voltage threshold reaches a second time threshold;
and when the voltage signal meets at least one of the first condition and the second condition, closing an oil injection chip of the oil injector.
Optionally, in the method, determining whether the voltage signal satisfies a first condition includes:
inputting the voltage signal into a first threshold processing circuit, wherein the first threshold processing circuit is used for comparing a voltage value of the voltage signal with a first voltage threshold, outputting a first level signal when the voltage value of the voltage signal is greater than the first voltage threshold, and outputting a second level signal when the voltage value of the voltage signal is less than or equal to the first voltage threshold;
and when the output signal of the first threshold processing circuit is a first level signal, and the state duration of the output signal of the first threshold processing circuit, which is the first level signal, reaches the first time threshold, determining that the voltage signal meets a first condition.
Optionally, in the method, determining whether the voltage signal satisfies a second condition includes:
inputting the voltage signal into a second threshold processing circuit, wherein the second threshold processing circuit is used for comparing a voltage value of the voltage signal with a second voltage threshold, outputting a first level signal when the voltage value of the voltage signal is greater than the second voltage threshold, and outputting a second level signal when the voltage value of the voltage signal is less than or equal to the second voltage threshold;
and when the state duration of the output signal of the second threshold processing circuit which is the first level signal reaches the second time threshold, determining that the voltage signal meets a second condition.
The present application further provides an auxiliary control device for a fuel injector, in which a sampling resistor is connected in series in a high-side driving circuit of the fuel injector, the auxiliary control device includes:
the voltage signal acquisition unit is used for acquiring voltage signals at two ends of the sampling resistor;
a judging unit configured to judge whether the voltage signal satisfies at least one of a first condition and a second condition; wherein the first condition is: the voltage value of the voltage signal is higher than a first voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the first voltage threshold reaches a first time threshold; the second condition is: the voltage value of the voltage signal is higher than a second voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the second voltage threshold reaches a second time threshold;
and the control unit is used for closing an oil injection chip of the oil injector when the voltage signal meets at least one of the first condition and the second condition.
The present application further provides an auxiliary control system for a fuel injector, where a sampling resistor is connected in series in a high-side driving circuit of the fuel injector, the auxiliary control system includes:
the first processing circuit is used for detecting a voltage signal at two ends of the sampling resistor, and outputting a first enabling signal when the voltage value of the voltage signal is higher than a first voltage threshold and the state duration time of the voltage signal, which is higher than the first voltage threshold, reaches a first time threshold;
the second processing circuit is used for detecting voltage signals at two ends of the sampling resistor and outputting a second enabling signal when the voltage value of the voltage signal is higher than a second voltage threshold and the state duration time of the voltage signal, which is higher than the second voltage threshold, reaches a second time threshold;
the first enabling signal and the second enabling signal are used for closing an oil injection chip of the oil injector.
Optionally, in the system, the first processing circuit includes:
the first detection circuit is used for detecting voltage signals at two ends of the sampling resistor;
a first threshold processing circuit connected to an output terminal of the first detector circuit, for outputting a first level signal when a voltage value of the voltage signal output from the first detector circuit is greater than the first voltage threshold, and outputting a second level signal when the voltage value of the voltage signal output from the first detector circuit is less than or equal to the first voltage threshold;
and the first signal processing circuit is connected with the output end of the first threshold processing circuit, and outputs a first enabling signal when the first threshold processing circuit outputs a first level signal and the state duration of the first level signal output by the first threshold processing circuit reaches a first time threshold.
Optionally, in the above system, the second processing circuit includes:
the second detection circuit is used for detecting voltage signals at two ends of the sampling resistor;
a second threshold processing circuit connected to an output terminal of the second detector circuit, for outputting a first level signal when a voltage value of the voltage signal output from the second detector circuit is greater than the second voltage threshold, and outputting a second level signal when the voltage value of the voltage signal output from the second detector circuit is less than or equal to the second voltage threshold;
and the second signal processing circuit is connected with the output end of the second threshold processing circuit, and outputs a second enabling signal when the second threshold processing circuit outputs a first level signal and the state duration of the first level signal output by the second threshold processing circuit reaches a second time threshold.
Optionally, in the system, the first processing circuit further includes:
and the first amplifying circuit is arranged between the output end of the first detection circuit and the input end of the first threshold processing circuit.
Optionally, in the above system, the second processing circuit further includes:
and the second amplifying circuit is arranged between the output end of the second detection circuit and the input end of the second threshold processing circuit.
Optionally, in the system, the first enable signal and the second enable signal are both low-level signals;
the system further comprises an enabling signal processing circuit, wherein the enabling signal processing circuit comprises an AND gate, a first input end of the AND gate is connected with an output end of the first processing circuit, a second input end of the AND gate is connected with an output end of the second processing circuit, and an output end of the AND gate is connected with an enabling end of the oil injection chip.
Therefore, the beneficial effects of the application are as follows:
according to the auxiliary control method, the auxiliary control device and the auxiliary control system of the oil sprayer, the sampling resistor is connected in series in a high-side driving circuit of the oil sprayer, the voltage values at two ends of the sampling resistor are used as control basis, if the voltage values at two ends of the sampling resistor are higher than a first voltage threshold value and the state duration reaches a first time threshold value, or if the voltage values at two ends of the sampling resistor are higher than a second voltage threshold value and the state duration reaches a second time threshold value, an error instruction sent by an oil injection chip is determined, and a switching tube in the oil sprayer driving circuit is closed by closing the oil injection chip, so that the oil sprayer driving circuit is protected. Based on the scheme disclosed by the application, when the oil injection chip sends out an error command, the oil injector driving circuit can be protected, and the possibility that the oil injector driving circuit is damaged is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional fuel injector control circuit;
FIG. 2 is a schematic diagram of a conventional fuel injector driver circuit;
FIG. 3 is a current waveform diagram of a fuel injector in a normal state;
FIG. 4 is a flow chart of a method of auxiliary control of a fuel injector as disclosed herein;
FIG. 5 is a schematic diagram illustrating an auxiliary control device for a fuel injector according to the present disclosure;
FIG. 6 is a schematic illustration of a fuel injector auxiliary control system according to the present disclosure;
FIG. 7 is a schematic illustration of an alternate auxiliary control system for a fuel injector as disclosed herein;
FIG. 8 is a schematic diagram of a first processing circuit according to the present disclosure;
fig. 9 is a schematic diagram of a second processing circuit according to the present disclosure.
Detailed Description
The applicant found that: the single chip microcomputer may send an error instruction to the oil injection chip due to software error, which causes the oil injection chip to send an error instruction to the oil injector driving circuit, and in addition, the oil injection chip may also send an error instruction to the oil injector driving circuit due to self failure. Under the control of an error instruction, a switch tube in the fuel injector driving circuit can be continuously conducted, and when the conduction time exceeds the bearing range of the switch tube, the fuel injector driving circuit can be damaged.
Therefore, the application discloses an auxiliary control method, an auxiliary control device and an auxiliary control system of an oil injector, when an oil injection chip sends out an error instruction, a driving circuit of the oil injector can be protected, and the possibility that the driving circuit of the oil injector is damaged is reduced.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all 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.
Referring to fig. 4, fig. 4 is a flowchart of an auxiliary control method of an injector disclosed in the present application. In the method, a sampling resistor, such as the sampling resistor R1 shown in FIG. 6, is connected in series in a high-side driving circuit of the fuel injector.
The auxiliary control method comprises the following steps:
step S1: and obtaining voltage signals at two ends of the sampling resistor.
Step S2: it is determined whether the voltage signal satisfies at least one of a first condition and a second condition.
Wherein the first condition is: the voltage value of the voltage signal is higher than a first voltage threshold value, and the state duration reaches a first time threshold value; the second condition is: the voltage value of the voltage signal is higher than a second voltage threshold, and the state duration reaches a second time threshold.
It should be noted that the current of the injector includes an opening current and a holding current. The value of the first voltage threshold is determined based on the resistance value of the sampling resistor and the starting current value of the oil injector in the normal state, and the value of the second voltage threshold is determined based on the resistance value of the sampling resistor and the maintaining current value of the oil injector in the normal state. The maintaining current value of the oil sprayer is smaller than the starting current value of the oil sprayer, so that the value of the second voltage threshold is smaller than that of the first voltage threshold.
When the fuel injection chip sends an error command to a switching tube in the fuel injector driving circuit to cause the switching tube to be continuously conducted, larger current flows through the sampling resistor continuously, and the voltage value at the two ends of the corresponding sampling resistor can be maintained at a larger value. Therefore, the voltage value at two ends of the sampling resistor is used as a control basis. If the voltage value of the two ends of the sampling resistor is higher than a first voltage threshold value and the state duration reaches a first time threshold value, or if the voltage value of the two ends of the sampling resistor is higher than a second voltage threshold value and the state duration reaches a second time threshold value, determining that an error instruction is sent by the oil injection chip and taking protective measures is needed.
In implementation, the values of the first time threshold and the second time threshold may be the same or different. As an example, the values of the first time threshold and the second time threshold are set to 0.2 ms.
Step S3: and when the voltage signal meets at least one of the first condition and the second condition, closing an oil injection chip of the oil injector.
When the voltage signal at the two ends of the sampling resistor meets at least one of the first condition and the second condition, the situation that the fuel injection chip sends a wrong instruction is indicated, and protective measures are started, namely the fuel injection chip is closed. After the oil injection chip is closed, a switch tube in the oil injector driving circuit is in a closed state, so that the oil injector driving circuit is protected.
According to the auxiliary control method of the fuel injector, the sampling resistor is connected in series in a high-side driving circuit of the fuel injector, voltage values at two ends of the sampling resistor serve as a control basis, if the voltage values at two ends of the sampling resistor are higher than a first voltage threshold value and the state duration reaches a first time threshold value, or if the voltage values at two ends of the sampling resistor are higher than a second voltage threshold value and the state duration reaches a second time threshold value, an error command sent by a fuel injection chip is determined, and a switching tube in the fuel injector driving circuit is closed by closing the fuel injection chip, so that the fuel injector driving circuit is protected. Based on the auxiliary control method of the oil sprayer disclosed by the application, when the oil spraying chip sends out an error instruction, the driving circuit of the oil sprayer can be protected, and the possibility that the driving circuit of the oil sprayer is damaged is reduced.
In one embodiment, determining whether the voltage signal across the sampling resistor satisfies a first condition comprises:
inputting voltage signals at two ends of a sampling resistor into a first threshold processing circuit, wherein the first threshold processing circuit is used for comparing the voltage value of the voltage signal with a first voltage threshold, outputting a first level signal when the voltage value of the voltage signal is greater than the first voltage threshold, and outputting a second level signal when the voltage value of the voltage signal is less than or equal to the first voltage threshold; when the output signal of the first threshold processing circuit is a first level signal and the state duration reaches a first time threshold, determining that the voltage signal meets a first condition.
When the oil injection chip sends out a correct instruction, the oil injector works normally, voltage signals at two ends of the sampling resistor are sawtooth waves, and at the moment, the first threshold processing circuit outputs square waves. When the fuel injection chip stops outputting the instruction, the fuel injector does not inject fuel, the voltage signals at two ends of the sampling resistor are low level (0 level), and the first threshold processing circuit outputs a second level signal at the moment. When the oil injection chip sends out an error command, the oil injector is abnormal, voltage signals at two ends of the sampling resistor keep high level, and at the moment, the first threshold processing circuit continuously outputs a first level signal. Therefore, when the output signal of the first threshold processing circuit is a first level signal and the state duration reaches a first time threshold, the condition that the fuel injection chip sends an error instruction is determined, and the fuel injection chip is closed, so that a switching tube in the fuel injector driving circuit is closed, and the fuel injector driving circuit is protected.
In one embodiment, determining whether the voltage signal across the sampling resistor satisfies the second condition includes:
inputting voltage signals at two ends of the sampling resistor into a second threshold processing circuit, wherein the second threshold processing circuit is used for comparing the voltage value of the voltage signal with a second voltage threshold, outputting a first level signal when the voltage value of the voltage signal is greater than the second voltage threshold, and outputting a second level signal when the voltage value of the voltage signal is less than or equal to the second voltage threshold; and when the output signal of the second threshold processing circuit is the first level signal and the state duration reaches a second time threshold, determining that the voltage signal meets a second condition.
When the oil injection chip sends out a correct instruction, the oil injector works normally, voltage signals at two ends of the sampling resistor are sawtooth waves, and square waves are output by the second threshold processing circuit at the moment. When the fuel injection chip stops outputting the instruction, the fuel injector does not inject fuel, the voltage signals at the two ends of the sampling resistor are low level (0 level), and the second threshold processing circuit outputs a second level signal at the moment. When the oil injection chip sends out an error command, the oil injector is abnormal, voltage signals at two ends of the sampling resistor keep high level, and at the moment, the second threshold processing circuit continuously outputs the first level signal. Therefore, when the output signal of the second threshold processing circuit is the first level signal and the state duration reaches the second time threshold, the condition that the fuel injection chip sends an error instruction is determined, and the fuel injection chip is closed, so that the switching tube in the fuel injector driving circuit is closed, and the fuel injector driving circuit is protected.
The application discloses an auxiliary control method of the oil sprayer, and correspondingly, the application also discloses an auxiliary control device of the oil sprayer.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an auxiliary control device of a fuel injector disclosed in the present application.
The assist control device includes:
and a voltage signal acquiring unit 10 for acquiring a voltage signal across the sampling resistor. The sampling resistor is connected in series in a high-side driving circuit of the fuel injector.
A judging unit 20 for judging whether the voltage signal satisfies at least one of the first condition and the second condition. Wherein the first condition is: the voltage value of the voltage signal at the two ends of the sampling resistor is higher than a first voltage threshold, and the state duration reaches a first time threshold; the second condition is: the voltage value of the voltage signal across the sampling resistor is higher than a second voltage threshold, and the state duration reaches a second time threshold.
And the control unit 30 is used for closing an oil injection chip of the oil injector when the voltage signal at the two ends of the sampling resistor meets at least one of the first condition and the second condition.
The auxiliary control device of the fuel injector is characterized in that a sampling resistor is connected in series in a high-side driving circuit of the fuel injector, voltage values at two ends of the sampling resistor are used as a control basis, if the voltage values at two ends of the sampling resistor are higher than a first voltage threshold value and the state duration reaches a first time threshold value, or if the voltage values at two ends of the sampling resistor are higher than a second voltage threshold value and the state duration reaches a second time threshold value, an error instruction sent by a fuel injection chip is determined, and a switching tube in the fuel injector driving circuit is closed by closing the fuel injection chip, so that the fuel injector driving circuit is protected. Based on the auxiliary control device of the oil sprayer disclosed by the application, when the oil spraying chip sends out an error instruction, the driving circuit of the oil sprayer can be protected, and the possibility that the driving circuit of the oil sprayer is damaged is reduced.
The auxiliary control device of the fuel injector disclosed in the present application may be disposed in an existing processor of the engine, or may be disposed in another processor of the engine, and the auxiliary control device is disposed in the newly added processor.
The application also discloses an auxiliary control system of the oil sprayer.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an auxiliary control system of a fuel injector disclosed in the present application. And a sampling resistor R1 is connected in series in a high-side driving circuit of the fuel injector. The secondary control system comprises a first processing circuit 100 and a second processing circuit 200.
The first processing circuit 100 is configured to: and detecting a voltage signal at two ends of the sampling resistor R1, and outputting a first enabling signal when the voltage value of the voltage signal is higher than a first voltage threshold and the state duration reaches a first time threshold.
The second processing circuit 200 is configured to: and detecting a voltage signal at two ends of the sampling resistor R1, and outputting a second enabling signal when the voltage value of the voltage signal is higher than a second voltage threshold and the state duration reaches a second time threshold.
The first enabling signal and the second enabling signal are used for closing an oil injection chip of the oil injector.
It should be noted that the current of the injector includes an opening current and a holding current. The value of the first voltage threshold is determined based on the resistance value of the sampling resistor and the starting current value of the oil injector in the normal state, and the value of the second voltage threshold is determined based on the resistance value of the sampling resistor and the maintaining current value of the oil injector in the normal state. The maintaining current value of the oil sprayer is smaller than the starting current value of the oil sprayer, so that the value of the second voltage threshold is smaller than that of the first voltage threshold.
According to the auxiliary control system of the oil sprayer, the sampling resistor is connected in series in a high-side driving circuit of the oil sprayer, the first processing circuit detects voltage signals at two ends of the sampling resistor, and if the voltage value at two ends of the sampling resistor is higher than a first voltage threshold value and the state duration reaches a first time threshold value, a first enabling signal is output, so that an oil spraying chip is closed, and the driving circuit of the oil sprayer is protected; and the second processing circuit detects voltage signals at two ends of the sampling resistor, and if the voltage values at two ends of the sampling resistor are higher than a second voltage threshold value and the state duration reaches a second time threshold value, a second enabling signal is output, so that an oil injection chip is closed, and an oil injector driving circuit is protected. Based on the auxiliary control system of the oil sprayer disclosed by the application, when the oil spraying chip sends out an error instruction, the driving circuit of the oil sprayer can be protected, and the possibility that the driving circuit of the oil sprayer is damaged is reduced.
Optionally, both the first enable signal output by the first processing circuit 100 and the first enable signal output by the second processing circuit 200 are low-level signals. On the basis of the auxiliary control system shown in fig. 6 of the present application, an enable signal processing circuit may be further provided, please refer to fig. 7.
The enable signal processing circuit includes an and gate 300, a first input terminal of the and gate 300 is connected to an output terminal of the first processing circuit 100, a second input terminal of the and gate 300 is connected to an output terminal of the second processing circuit 200, and an output terminal of the and gate 300 is connected to an enable terminal of the fuel injection chip. When the first processing circuit 100 outputs the first enable signal or the second processing circuit 200 outputs the second enable signal, the fuel injection chip is turned off.
In addition, the output end of the and gate 300 may be connected to the single chip microcomputer, so that the single chip microcomputer determines whether an abnormality occurs based on the output of the and gate 300.
In one embodiment, the first processing circuit 100 has a structure as shown in fig. 8, and specifically includes a first detection circuit 101, a first threshold processing circuit 102, and a first signal processing circuit 103.
Wherein:
the first detector circuit 101 detects a voltage signal across the sampling resistor.
The first threshold processing circuit 102 is connected to the output terminal of the first detector circuit 101, and outputs a first level signal when the voltage value of the voltage signal output from the first detector circuit 101 is greater than a first voltage threshold, and outputs a second level signal when the voltage value of the voltage signal output from the first detector circuit 101 is less than or equal to the first voltage threshold.
The first signal processing circuit 103 is connected to the output terminal of the first threshold processing circuit 102, and outputs a first enable signal when the first threshold processing circuit 102 outputs a first level signal and the state duration reaches a first time threshold.
Alternatively, a first amplification circuit is provided between the first detector circuit 101 and the first threshold processing circuit 102. That is, the output terminal of the first detector circuit 101 is connected to the input terminal of the first amplifier circuit, and the output terminal of the first amplifier circuit is connected to the input terminal of the first threshold processing circuit 102. The first amplifier circuit amplifies the voltage signal output from the first detector circuit 101.
Note that, in both cases where the first processing circuit 100 includes the first amplifier circuit and does not include the first amplifier circuit, specific values of the first voltage threshold of the first threshold processing circuit 102 are different.
In one embodiment, the second processing circuit 200 has a structure as shown in fig. 9, and specifically includes a second detection circuit 201, a second threshold processing circuit 202, and a second signal processing circuit 203.
Wherein:
and a second detection circuit 201 for detecting a voltage signal across the sampling resistor.
The second threshold processing circuit 202 is connected to the output terminal of the second detector circuit 201, and outputs a first level signal when the voltage value of the voltage signal output from the second detector circuit 201 is greater than a second voltage threshold, and outputs a second level signal when the voltage value of the voltage signal output from the second detector circuit 201 is less than or equal to the second voltage threshold.
The second signal processing circuit 203 is connected to the output terminal of the second threshold processing circuit 202, and outputs a second enable signal when the second threshold processing circuit 202 outputs the first level signal and the state duration reaches a second time threshold.
Alternatively, a second amplification circuit is provided between the second detection circuit 201 and the second threshold processing circuit 202. That is, the output terminal of the second detector circuit 201 is connected to the input terminal of the second amplifier circuit, and the output terminal of the second amplifier circuit is connected to the input terminal of the second threshold processing circuit 202. The second amplification circuit is configured to amplify the voltage signal output from the second detection circuit 201.
Note that, in both cases where the second processing circuit 200 includes the second amplifier circuit and does not include the second amplifier circuit, specific values of the second voltage threshold of the second threshold processing circuit 202 are different.
It should be noted that the current of the injector includes an opening current and a holding current. The first detector circuit 101 detects a current value of the on current and outputs a corresponding voltage signal. The second detector circuit 201 detects the current value of the holding current and outputs a corresponding voltage signal. The parameter settings of the first detection circuit 101 and the second detection circuit 291 are different so as to detect current waveforms of different amplitudes.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the device and the system disclosed by the embodiment, the description is simple because the device and the system correspond to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
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 (10)
1. An auxiliary control method of an oil injector, characterized in that a sampling resistor is connected in series in a high-side driving circuit of the oil injector, and the method comprises the following steps:
obtaining voltage signals at two ends of the sampling resistor;
judging whether the voltage signal meets at least one of a first condition and a second condition; wherein the first condition is: the voltage value of the voltage signal is higher than a first voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the first voltage threshold reaches a first time threshold; the second condition is: the voltage value of the voltage signal is higher than a second voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the second voltage threshold reaches a second time threshold;
and when the voltage signal meets at least one of the first condition and the second condition, closing an oil injection chip of the oil injector.
2. The method of claim 1, wherein determining whether the voltage signal satisfies a first condition comprises:
inputting the voltage signal into a first threshold processing circuit, wherein the first threshold processing circuit is used for comparing a voltage value of the voltage signal with a first voltage threshold, outputting a first level signal when the voltage value of the voltage signal is greater than the first voltage threshold, and outputting a second level signal when the voltage value of the voltage signal is less than or equal to the first voltage threshold;
and when the output signal of the first threshold processing circuit is a first level signal, and the state duration of the output signal of the first threshold processing circuit, which is the first level signal, reaches the first time threshold, determining that the voltage signal meets a first condition.
3. The method of claim 1, wherein determining whether the voltage signal satisfies a second condition comprises:
inputting the voltage signal into a second threshold processing circuit, wherein the second threshold processing circuit is used for comparing a voltage value of the voltage signal with a second voltage threshold, outputting a first level signal when the voltage value of the voltage signal is greater than the second voltage threshold, and outputting a second level signal when the voltage value of the voltage signal is less than or equal to the second voltage threshold;
and when the state duration of the output signal of the second threshold processing circuit which is the first level signal reaches the second time threshold, determining that the voltage signal meets a second condition.
4. An auxiliary control device for an injector, characterized in that a sampling resistor is connected in series in a high-side drive circuit of the injector, the auxiliary control device comprising:
the voltage signal acquisition unit is used for acquiring voltage signals at two ends of the sampling resistor;
a judging unit configured to judge whether the voltage signal satisfies at least one of a first condition and a second condition; wherein the first condition is: the voltage value of the voltage signal is higher than a first voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the first voltage threshold reaches a first time threshold; the second condition is: the voltage value of the voltage signal is higher than a second voltage threshold, and the state duration time that the voltage value of the voltage signal is higher than the second voltage threshold reaches a second time threshold;
and the control unit is used for closing an oil injection chip of the oil injector when the voltage signal meets at least one of the first condition and the second condition.
5. An auxiliary control system for an injector, characterized in that a sampling resistor is connected in series in a high-side drive circuit of the injector, the auxiliary control system comprising:
the first processing circuit is used for detecting a voltage signal at two ends of the sampling resistor, and outputting a first enabling signal when the voltage value of the voltage signal is higher than a first voltage threshold and the state duration time of the voltage signal, which is higher than the first voltage threshold, reaches a first time threshold;
the second processing circuit is used for detecting voltage signals at two ends of the sampling resistor and outputting a second enabling signal when the voltage value of the voltage signal is higher than a second voltage threshold and the state duration time of the voltage signal, which is higher than the second voltage threshold, reaches a second time threshold;
the first enabling signal and the second enabling signal are used for closing an oil injection chip of the oil injector.
6. The system of claim 5, wherein the first processing circuit comprises:
the first detection circuit is used for detecting voltage signals at two ends of the sampling resistor;
a first threshold processing circuit connected to an output terminal of the first detector circuit, for outputting a first level signal when a voltage value of the voltage signal output from the first detector circuit is greater than the first voltage threshold, and outputting a second level signal when the voltage value of the voltage signal output from the first detector circuit is less than or equal to the first voltage threshold;
and the first signal processing circuit is connected with the output end of the first threshold processing circuit, and outputs the first enabling signal when the first threshold processing circuit outputs a first level signal and the state duration of the first level signal output by the first threshold processing circuit reaches the first time threshold.
7. The system of claim 6, wherein the second processing circuit comprises:
the second detection circuit is used for detecting voltage signals at two ends of the sampling resistor;
a second threshold processing circuit connected to an output terminal of the second detector circuit, for outputting a first level signal when a voltage value of the voltage signal output from the second detector circuit is greater than the second voltage threshold, and outputting a second level signal when the voltage value of the voltage signal output from the second detector circuit is less than or equal to the second voltage threshold;
and the second signal processing circuit is connected with the output end of the second threshold processing circuit, and outputs the second enabling signal when the second threshold processing circuit outputs the first level signal and the state duration of the first level signal output by the second threshold processing circuit reaches the second time threshold.
8. The system of claim 6, wherein the first processing circuit further comprises:
and the first amplifying circuit is arranged between the output end of the first detection circuit and the input end of the first threshold processing circuit.
9. The system of claim 7, wherein the second processing circuit further comprises:
and the second amplifying circuit is arranged between the output end of the second detection circuit and the input end of the second threshold processing circuit.
10. The system of claim 5, wherein the first enable signal and the second enable signal are both low level signals;
the system further comprises an enabling signal processing circuit, wherein the enabling signal processing circuit comprises an AND gate, a first input end of the AND gate is connected with an output end of the first processing circuit, a second input end of the AND gate is connected with an output end of the second processing circuit, and an output end of the AND gate is connected with an enabling end of the oil injection chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910581096.8A CN110307108B (en) | 2019-06-29 | 2019-06-29 | Auxiliary control method, auxiliary control device and auxiliary control system of oil injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910581096.8A CN110307108B (en) | 2019-06-29 | 2019-06-29 | Auxiliary control method, auxiliary control device and auxiliary control system of oil injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110307108A CN110307108A (en) | 2019-10-08 |
| CN110307108B true CN110307108B (en) | 2020-12-22 |
Family
ID=68078525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910581096.8A Active CN110307108B (en) | 2019-06-29 | 2019-06-29 | Auxiliary control method, auxiliary control device and auxiliary control system of oil injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110307108B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5752482A (en) * | 1997-03-28 | 1998-05-19 | Cummins Engine Company, Inc. | System for integrally controlling current flow through number of inductive loads |
| CN102486131A (en) * | 2010-12-06 | 2012-06-06 | 联创汽车电子有限公司 | Driving diagnosis and protection circuit for fuel injector |
| CN104747333A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Integrated drive circuit for high pressure common rail injectors |
| CN105736162A (en) * | 2014-12-08 | 2016-07-06 | 联创汽车电子有限公司 | Common rail diesel engine oil injection control system |
| JP2017072082A (en) * | 2015-10-07 | 2017-04-13 | 株式会社デンソー | Fuel injection control device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050103110A1 (en) * | 2003-11-19 | 2005-05-19 | Cts Corporation | Integrated pressure and temperature sensor |
-
2019
- 2019-06-29 CN CN201910581096.8A patent/CN110307108B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5752482A (en) * | 1997-03-28 | 1998-05-19 | Cummins Engine Company, Inc. | System for integrally controlling current flow through number of inductive loads |
| CN102486131A (en) * | 2010-12-06 | 2012-06-06 | 联创汽车电子有限公司 | Driving diagnosis and protection circuit for fuel injector |
| CN105736162A (en) * | 2014-12-08 | 2016-07-06 | 联创汽车电子有限公司 | Common rail diesel engine oil injection control system |
| CN104747333A (en) * | 2015-03-11 | 2015-07-01 | 中国重汽集团济南动力有限公司 | Integrated drive circuit for high pressure common rail injectors |
| JP2017072082A (en) * | 2015-10-07 | 2017-04-13 | 株式会社デンソー | Fuel injection control device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110307108A (en) | 2019-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4736267A (en) | Fault detection circuit | |
| KR100221907B1 (en) | Method and device for functional monitoring of an electrical load | |
| JP4565574B2 (en) | Anomaly detection device | |
| US20170070222A1 (en) | Adaptive blanking timer for short circuit detection | |
| EP3533123B1 (en) | Short-circuit detection for half-bridge peak-and-hold pre-driver | |
| EP3488254A1 (en) | Half-bridge driver fault diagnostic system and method | |
| JP2000037032A (en) | Protection circuit of power converter | |
| US20200127657A1 (en) | Drive circuit for semiconductor element | |
| US5880918A (en) | Method and device for monitoring the serviceability of a load | |
| US6661216B1 (en) | Apparatus and method for controlling startup of a precharged switching regulator | |
| WO2017215335A1 (en) | Igbt short-circuit protection circuit and method, igbt driver and igbt circuit | |
| JPS6338549B2 (en) | ||
| US20150295395A1 (en) | Interruption of a current | |
| US7902833B2 (en) | Malfunction detecting circuit and malfunction detecting method for detecting malfunction of current-sensing resistor, and power converting system applying the malfunction detecting circuit | |
| US7199589B2 (en) | Method for controlling a switching converter and control device for a switching converter | |
| US7339356B1 (en) | Apparatus and method for controlling a power converter device | |
| CN110307108B (en) | Auxiliary control method, auxiliary control device and auxiliary control system of oil injector | |
| US6751080B2 (en) | Control circuit for semiconductor device with overheat protecting function | |
| JPH11159378A (en) | Solenoid valve drive device | |
| WO2008021440A2 (en) | Buck converter fault detection method | |
| CN116660784A (en) | Low-side switch load short circuit detection and protection method | |
| KR100274459B1 (en) | Over-current detect circuit in inverter | |
| JP2009100582A (en) | Current limiting device | |
| JPH07194175A (en) | Drive device of linear solenoid | |
| FR3116161A1 (en) | Short-circuit detector for power transistor by monitoring the current of its gate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |