CN113586303B - Oil injection time determining system and vehicle - Google Patents
Oil injection time determining system and vehicle Download PDFInfo
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- CN113586303B CN113586303B CN202110966882.7A CN202110966882A CN113586303B CN 113586303 B CN113586303 B CN 113586303B CN 202110966882 A CN202110966882 A CN 202110966882A CN 113586303 B CN113586303 B CN 113586303B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
Abstract
The embodiment of the invention discloses an oil injection time determining system and a vehicle. The system comprises: the device comprises a current sensor, a signal processor, an image collector and an upper computer; the current sensor is connected with the signal processor, and the signal processor is connected with the image collector; the signal processor and the image collector are respectively connected with the upper computer; the current sensor is used for collecting a driving current signal of the oil sprayer after receiving a driving signal of the electric control driving unit of the oil sprayer; the signal processor is used for generating an image acquisition driving signal according to the driving current signal of the oil sprayer; the image collector is used for controlling the image collection of the oil spraying area according to the image collection driving signal to obtain an image collection sequence; and the upper computer is used for determining the driving starting time and the driving closing time of the oil injection process according to the image acquisition driving signal and determining the oil injection starting time and the oil injection closing time of the oil injection process according to the image acquisition sequence.
Description
Technical Field
The embodiment of the invention relates to the technical field of control, in particular to an oil injection time determining system and a vehicle.
Background
In the working process of the vehicle fuel injector, the fuel injection driving time of the vehicle fuel injector and the actual fuel injection time have hysteresis. Generally, the actual oil injection time of the oil injector lags behind the oil injection driving time, and the actual oil injection quantity is inconsistent with the calibrated oil injection quantity.
At present, the injection driving time and the actual injection time of an injector are detected by comparing a driving signal with a simulated oil quantity signal output by a single injection oil quantity detector. The method usually needs manual detection of the corresponding relation between the driving pulse width and the oil injection starting time, the labor cost is high, and automatic detection cannot be realized. The other mode is based on indirect detection of current, the opening response time of the oil injector is obtained by using the current change rate of the inductance characteristic of the electromagnetic valve, and the current fluctuation after closing driving is used as the closing time. The drive time of the needle valve is determined by the change of the rail pressure, and is mapped to the oil injection time. The indirect detection mode based on the current has large uncertainty factors, and the measured result has large errors.
Disclosure of Invention
The embodiment of the invention provides an oil injection time determining system and a vehicle, which are used for reducing errors of oil injector driving and oil injection time detection and improving the detection efficiency and accuracy.
In a first aspect, an embodiment of the present invention provides a system for determining an oil injection time, including:
the device comprises a current sensor, a signal processor, an image collector and an upper computer; the current sensor is connected with the signal processor, and the signal processor is connected with the image collector; the signal processor and the image collector are respectively connected with the upper computer; wherein the content of the first and second substances,
the current sensor is used for collecting a driving current signal of the oil sprayer after receiving a driving signal of the electric control driving unit of the oil sprayer;
the signal processor is used for generating an image acquisition driving signal according to the oil sprayer driving current signal;
the image collector is used for controlling the image collection of the oil spraying area according to the image collection driving signal to obtain an image collection sequence;
and the upper computer is used for determining the driving starting time and the driving closing time of the oil injection process according to the image acquisition driving signal and determining the oil injection starting time and the oil injection closing time of the oil injection process according to the image acquisition sequence.
In a second aspect, embodiments of the present invention further provide a vehicle, which when executed implements a fuel injection timing determining system as in any one of the embodiments of the present invention.
According to the embodiment of the invention, the automatic detection of the determining process of the driving opening and closing time of the oil injector and the oil injection opening and closing time is realized by adopting a mode of combining software and hardware. Through the external hardware circuit, the single injection oil mass detector with higher configuration does not need to be prepared, and the hardware cost is saved. The driving and oil injection opening and closing time of the oil injector is determined by processing the image sequence acquired by the image acquisition device through software, complex analysis is not needed, and the detection efficiency is improved. In addition, the scheme does not need to indirectly determine the oil injection time based on the current, so that the introduction of errors is reduced, and the accuracy of a calculation result is improved.
Drawings
FIG. 1A is a schematic diagram of a system for determining injection timing according to one embodiment of the present invention;
FIG. 1B is a schematic diagram of a system for determining injection timing according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for determining injection timing according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a fuel injection timing determining system according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a fuel injection timing determining system according to a fourth embodiment of the present invention;
fig. 5 is a characteristic timing diagram of an injection timing determination system according to a fifth embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. It should be further noted that, for the convenience of description, only some of the structures associated with the present application are shown in the drawings, not all of them.
Fig. 1A is a schematic structural diagram of an oil injection timing determining system according to an embodiment of the present disclosure, and as shown in fig. 1A, the oil injection timing determining system includes: a current sensor 110, a signal processor 120, an image collector 130 and an upper computer 140.
The current sensor 110 is connected to the signal processor 120, and the signal processor 120 is connected to the image collector 130; the signal processor 120 and the image collector 130 are respectively connected with the upper computer 140.
The current sensor 110 is configured to collect a driving current signal of the fuel injector after receiving a driving signal of the electronic control driving unit of the fuel injector.
The signal processor 120 is configured to generate an image acquisition driving signal according to the injector driving current signal.
The image collector 130 is configured to control image collection of the oil injector according to the image collection driving signal, so as to obtain an image collection sequence.
And the upper computer 140 is used for determining the driving starting time and the driving closing time of the oil injection process according to the image acquisition driving signal, and determining the oil injection starting time and the oil injection closing time of the oil injection process according to the image acquisition sequence.
The image collector 130 may be any device or equipment capable of collecting images, such as a camera, a video camera, and the like. Preferably, the image collector 130 may be a high-speed industrial camera, the high-speed industrial camera has the characteristics of high image stability, high transmission capability, high anti-interference capability, and the like, the exposure time is short, and the frame number range of image collection may be determined according to actual requirements, for example, the range is controlled at 500-25000 frames.
Specifically, as shown in fig. 1B, an input end of the current sensor 110 is connected to at least one injector electronic control driving unit. The fuel injector electric control driving unit is used for detecting a fuel injector driving instruction and generating a driving signal when receiving the fuel injector driving instruction. The current sensor 110 is configured to receive a driving signal of the electronic control driving unit of the fuel injector, and acquire a driving current signal of the fuel injector after receiving the driving signal. The current sensor 110 sends the received injector driving current signal to the signal processor 120, and the signal processor 120 processes the injector driving current signal. The signal processor 120 generates an image acquisition driving signal from the processed injector driving current signal, and sends the image acquisition driving signal to the image acquirer 130 and the upper computer 140, and the image acquirer 130 and the upper computer 140 perform corresponding processing on the image acquisition driving signal. When the image capture driving signal is received by the image capture device 130 as a high level after the signal processor 120 sends the image capture driving signal, the image capture device starts capturing an image.
The upper computer 140 may be a computer, or other equipment. And after receiving the image acquisition driving signal, the upper computer 140 determines the driving starting time and the driving closing time of the oil injection process. The upper computer 140 receives the image acquisition sequence sent by the image acquisition device 130, and then determines the oil injection starting time and the oil injection closing time of the oil injection process. In the embodiment, the automatic detection of the determining process of the driving opening and closing time and the oil injection opening and closing time of the oil injector is realized by adopting a mode of combining software and hardware.
According to the embodiment of the invention, the automatic detection of the determining process of the driving opening and closing time of the oil injector and the oil injection opening and closing time is realized by adopting a mode of combining software and hardware. Through the external hardware circuit, a single injection oil quantity detector with high configuration does not need to be prepared, and the hardware cost is saved. The driving and oil injection opening and closing time of the oil injector is determined by processing the image sequence acquired by the image acquisition device through software, complex analysis is not needed, and the detection efficiency is improved. In addition, the scheme does not need to indirectly determine the oil injection time based on the current, so that the introduction of errors is reduced, and the accuracy of a calculation result is improved.
Referring to fig. 2, a schematic structural diagram of a fuel injection timing determining system is shown, and based on the above technical solutions, in an alternative embodiment, the signal processor 120 includes a level converter, and is configured to generate the image capturing driving signal according to the fuel injector driving current signal.
Specifically, the level shifter is a device capable of converting an injector driving current signal into an image acquisition driving signal. The image capture driving signal may be a Transistor-Transistor Logic (TTL) level signal. The level shifter may be constituted by a general-purpose operational amplifier, or may be constituted by another circuit capable of performing level shifting between signals. The conversion between different signals is realized by adding a level converter in the signal processor, which facilitates the control of the image collector 130.
Due to reasons such as data transmission delay and system errors, the injector driving current signal acquired by the current sensor 110 has a hysteresis characteristic, so that the accuracy of the final determination result of the upper computer is affected. To avoid this, reference is further made to the schematic diagram of an injection timing determination system shown in fig. 3. In an alternative embodiment, the signal processor 120 is further provided with a comparator; the upper computer 140 is provided with a digital-to-analog converter; a first input terminal of the comparator is connected to an output terminal of the current sensor 110; the second input end of the comparator is connected with the output end of the digital-to-analog converter; and the output end of the comparator is connected with the input end of the level shifter.
Specifically, the comparator in the signal processor 120 may be configured to compare the voltage data corresponding to the injector driving current signal with the preset voltage threshold outputted by the digital-to-analog converter. The preset voltage threshold is related to at least one of the types of the fuel injectors and the types of the fuel injectors, and may be specifically set by a person in the related art according to experience values for fuel injectors of different types or types, or determined through a large number of tests.
The digital-to-analog converter in the upper computer 140 can convert the digital signal of the preset voltage threshold into an analog signal, and compare the voltage data corresponding to the driving current signal of the fuel injector with the preset voltage threshold. If the corresponding voltage data of the oil injection driving current signal is larger than a preset voltage threshold, the comparator outputs a high level; and if the voltage data corresponding to the oil injection driving current signal is not greater than the preset voltage threshold, the comparator outputs a low level. The output of the comparator may be connected to the input of a level shifter, the output signal of the comparator being correspondingly converted by the level shifter.
According to the optional embodiment, different preset thresholds are set according to different types or types of oil injectors, a comparator is introduced into a signal processor, a digital-to-analog converter is introduced into an upper computer, and the digital-to-analog converter can convert digital signals with the set thresholds into analog signals; the comparator can compare the voltage data corresponding to the oil injector driving current signal with the analog signal after the set threshold value conversion, so that the output hysteresis of the oil injector driving current signal is compensated, the problem of the output hysteresis of the oil injector driving current signal is effectively solved, and the accuracy of the data such as the driving starting time, the driving ending time, the oil injection starting time and the oil injection closing time is improved.
In an optional implementation manner of the foregoing embodiment, a voltage dividing resistor is disposed between the output end of the digital-to-analog converter and the second input end of the comparator. As shown in fig. 4, the output of the digital-to-analog converter may be directly connected to the comparator. A resistor may be disposed between the output of the digital-to-analog converter and the comparator to divide the voltage. This has the advantage that the circuit can be made safer and device burn-out avoided.
In an optional embodiment, the upper computer 140 is configured to determine a driving start time of the oil injection process according to the image capturing driving signal, and includes: the upper computer 140 is used for determining the driving starting moment of the oil injection process if the image acquisition driving signal is identified to be a high level; and if the image acquisition driving signal is identified to be a low level, determining the driving closing time of the oil injection process.
Specifically, the upper computer 140 obtains an image acquisition driving signal through the level shifter, and records the start time of the oil injection driving in the oil injection process. And when the image acquisition driving signal acquired by the upper computer 140 through the level converter is at a low level, recording the driving closing moment of the oil injection process. The optional embodiment determines the driving opening and closing time of the oil injection process by judging the level of the received acquisition driving signal, and effectively solves the problem of determining the oil injection driving opening and closing time.
In an optional embodiment, the upper computer 140 is configured to determine, according to the image acquisition sequence, an oil injection start time and an oil injection stop time of the oil injection process, and includes: and the upper computer 140 is used for determining the oil injection starting time and the oil injection closing time of the oil injection process according to the gray level histograms of the target images in the image acquisition sequence.
Specifically, the image acquisition sequence may be an image of the oil injection area, and the image acquisition sequence may be continuously and continuously captured by the image acquirer 130 for the oil injection area, where the number of the camera image acquisition sequences with different frame rates is different.
The upper computer 140 includes an image processing algorithm, and can process each target image of the image acquisition sequence. The target image may be an image currently being processed by the upper computer 140 in an image acquisition sequence. The oil injection of the oil injector is in a linear non-discrete characteristic, and the image processing algorithm does not need to process the oil outlet shape in the target image of the image acquisition sequence. Therefore, the complexity requirement on the image processing algorithm can be reduced, and the calculation period of the upper computer is shortened.
Because the gray value of the pixel point when the oil is sprayed out is different from the gray value of the pixel point when the oil is not sprayed out, the image processing algorithm can only process the gray histogram of the target image without image enhancement, edge extraction and other processing. The gray level histogram is a function of gray level distribution, and is a statistic of gray level distribution in an image. The gray histogram is to count the occurrence frequency of all pixels in the digital image according to the size of the gray value.
The upper computer can determine the oil injection starting time and the oil injection closing time of the oil injection process according to the gray level histogram of each target image in the image acquisition sequence. Exemplarily, an image processing algorithm processes a gray level histogram of each target image in an image acquisition sequence to obtain gray level information of the gray level histogram of each target image; and determining the oil injection starting time and the oil injection closing time of the oil injection process according to the gray level information of the target image gray level histogram.
The alternative embodiment determines the fuel injection start time and the fuel injection shut-off time by processing each target image in the image acquisition sequence with an image processing algorithm. And the adopted image processing method has low complexity, the oil injection opening and closing time can be determined only by processing the gray level histogram of the target image, the calculation period of the computer is reduced, and the hysteresis of the calculation time of the upper computer can be ignored.
In an optional embodiment, the upper computer 140 is configured to determine, according to the gray level histogram of each target image that arrives in the image acquisition sequence, an oil injection start time and an oil injection stop time of the oil injection process in sequence, and includes: the upper computer 140 is used for determining whether the gray histogram of the target image meets a preset gray condition according to the target image uploaded each time, and taking the corresponding moment when the preset gray condition is met for the first time as the oil injection starting moment of the oil injection process; and taking the corresponding moment when the preset gray scale condition is met at the last time as the oil injection closing moment of the oil injection process at this time.
Specifically, the image collector 130 uploads the collected image collection sequence to the upper computer, and the upper computer 140 processes the gray level histogram of the target image uploaded each time through an image processing algorithm. In order to ensure that the determination of the oil injection opening and closing time is more accurate, the gray level histogram of the target image can be compared with the preset gray level condition in a preset gray level condition mode. The preset gray scale condition may be a preset gray scale value of the gray scale histogram, the highest peak value of the gray scale histogram of the target image may be compared with the preset gray scale value, or other preset gray scale conditions may also be used. The preset gray scale condition can be automatically set according to related algorithms and related data of gray scale histograms of a large number of image acquisition sequences acquired in the past, or can be set according to human experience.
Specifically, the opening and closing time of the oil injection at this time is determined by determining whether a gray level histogram of the target image meets a preset gray level value. And taking the corresponding oil injection time when the preset gray scale condition is met for the first time as the oil injection starting time of the oil injection process, and taking the corresponding oil injection time when the preset gray scale condition is met for the last time as the oil injection closing time of the oil injection process. Whether the gray level histogram of the target image in the image acquisition sequence meets the preset gray level condition or not is judged by setting the preset gray level condition, and the oil injection starting time and the oil injection closing time are respectively determined according to the time meeting the preset gray level condition, so that the accuracy of determining the oil injection starting time and the oil injection closing time is improved.
In order to avoid machine wear caused by excessive use of the image collector and reduce waste of data resources, in an optional embodiment, the upper computer 140 is further provided with a closing instruction output end, which is used for sending a closing instruction to the image collector 130 after determining the oil injection closing time, so as to control the image collector to stop image collection.
Specifically, the upper computer 140 is further provided with a closing instruction output end, and when the upper computer 140 confirms the oil injection closing time, the closing instruction is sent to the image collector 130 to control the image collector to stop image collection. Before the image collector 130 does not receive a closing instruction output by the upper computer, the high-speed collection state is always kept. According to the optional embodiment, the image collector is timely closed after the oil injection closing time is determined, so that the image collector does not work after the oil injection is finished, and the image collector is opened again until the oil injector works next time.
In an optional embodiment, the upper computer 140 is further configured to determine an opening delay time according to the driving start time and the oil injection start time; determining closing delay time according to the driving closing time and the oil injection closing time; and determining the actual oil injection time according to the oil injection closing time and the oil injection starting time.
Specifically, as shown in fig. 5, the driving opening time of this fuel injection process is marked as T1, the driving closing time is marked as T3, the fuel injection starting time is marked as T2, and the fuel injection closing time is marked as T3. Determining opening delay time T2-T1 according to the driving opening time T1 and the oil injection starting time T2; the closing delay times T4-T3 are determined as a function of the drive closing time T3 and the injection closing time T4. The delay time of the fuel injector in the process of starting fuel injection when receiving the driving signal is related to an actuator in the fuel injector, the actuator can represent the speed of the fuel injector to perform actions, and the delay time is related to the performance of the actuator. The actuator can be optimized according to the opening delay time and the closing delay time of the fuel injector. The upper computer can determine the theoretical oil injection pulse width 11 according to T3-T1, can determine the actual oil injection pulse width 12 according to T4-T2, and can control the oil injection quantity of the oil injector according to the corresponding relation between the theoretical oil injection pulse width 11 and the actual oil injection pulse width 12.
This alternative embodiment optimizes the execution by determining the on and off delay times of the injection. The actuator is related to the speed of the action performed by the injector, so that the delay time of opening and closing the injection can be reduced by optimizing the actuator. Meanwhile, the control of the oil injection quantity of the oil injector is realized by determining the theoretical oil injection pulse width and the actual oil injection pulse width, the waste of the oil injection quantity can be effectively prevented, and the resources are saved.
The invention also comprises an optional embodiment of a vehicle, wherein the fuel injection time determining system provided by the technical scheme is arranged in the vehicle.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (8)
1. A fuel injection timing determination system, comprising:
the device comprises a current sensor, a signal processor, an image collector and an upper computer; the current sensor is connected with the signal processor, and the signal processor is connected with the image collector; the signal processor and the image collector are respectively connected with the upper computer; wherein, the first and the second end of the pipe are connected with each other,
the current sensor is used for collecting a driving current signal of the oil sprayer after receiving a driving signal of the electric control driving unit of the oil sprayer;
the signal processor is used for generating an image acquisition driving signal according to the oil sprayer driving current signal;
the image collector is used for controlling the image collection of the oil spraying area according to the image collection driving signal to obtain an image collection sequence;
the upper computer is used for determining the driving starting time and the driving closing time of the oil injection process according to the image acquisition driving signal and determining the oil injection starting time and the oil injection closing time of the oil injection process according to the image acquisition sequence;
the signal processor comprises a level converter and is used for generating the image acquisition driving signal according to the fuel injector driving current signal;
the signal processor is also provided with a comparator; the upper computer is provided with a digital-to-analog converter;
the first input end of the comparator is connected with the output end of the current sensor; the second input end of the comparator is connected with the output end of the digital-to-analog converter; and the output end of the comparator is connected with the input end of the level shifter.
2. The system of claim 1, wherein a voltage dividing resistor is disposed between the output terminal of the digital-to-analog converter and the second input terminal of the comparator.
3. The system according to any one of claims 1-2, wherein the upper computer is configured to determine a driving start time of the oil injection process according to the image acquisition driving signal, and includes:
the upper computer is used for determining the driving starting moment of the oil injection process if the image acquisition driving signal is identified to be a high level; and if the image acquisition driving signal is identified to be a low level, determining the driving closing time of the oil injection process.
4. The system according to any one of claims 1-2, wherein the upper computer is configured to determine an oil injection start time and an oil injection close time of the oil injection process according to the image acquisition sequence, and includes:
and the upper computer is used for determining the oil injection starting time and the oil injection closing time of the oil injection process according to the gray level histograms of the target images in the image acquisition sequence in sequence.
5. The system of claim 4, wherein the upper computer is configured to determine an oil injection start time and an oil injection stop time of the oil injection process according to the gray level histogram of each target image in the image acquisition sequence, and includes:
the upper computer is used for determining whether a gray level histogram of the target image meets a preset gray level condition or not according to the target image uploaded each time, and taking the corresponding moment when the preset gray level condition is met for the first time as the oil injection starting moment of the oil injection process; and taking the corresponding moment when the preset gray scale condition is met at the last time as the oil injection closing moment of the oil injection process at this time.
6. The system of claim 5, wherein the upper computer is further provided with a closing instruction output end, and is used for sending a closing instruction to the image collector after the oil injection closing time is determined, so as to control the image collector to stop image collection.
7. The system according to any one of claims 1-2, wherein:
the upper computer is also used for determining the starting delay time according to the driving starting time and the oil injection starting time; determining closing delay time according to the driving closing time and the oil injection closing time; and determining the actual oil injection time according to the oil injection closing time and the oil injection starting time.
8. A vehicle, characterized in that the vehicle is provided with a fuel injection timing determination system as claimed in any one of claims 1-7.
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