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CN112564848A - Interference signal filtering device, automobile and interference signal filtering method of automobile - Google Patents

Interference signal filtering device, automobile and interference signal filtering method of automobile Download PDF

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Publication number
CN112564848A
CN112564848A CN202011346351.XA CN202011346351A CN112564848A CN 112564848 A CN112564848 A CN 112564848A CN 202011346351 A CN202011346351 A CN 202011346351A CN 112564848 A CN112564848 A CN 112564848A
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signal
module
voltage
control signal
filtering
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CN112564848B (en
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单成龙
胡聪
宋爱
刘兆斌
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00Jamming of communication; Counter-measures
    • H04K3/20Countermeasures against jamming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/801Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
    • H04B10/802Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
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Abstract

The invention discloses an interference signal filtering device, an automobile and an interference signal filtering method thereof, wherein the device comprises: a first filtering unit and a second filtering unit; the first filtering unit is configured to filter an electromagnetic interference signal in an input control signal to obtain a first control signal; the control signal is a control signal of an interference signal to be filtered; the control signal comprises: a wake-up signal of a vehicle controller of the vehicle; the second filtering unit is configured to filter a strong electric interference signal in the first control signal to obtain a second control signal, and the second control signal is used as an effective control signal after the interference signal is filtered from the control signal. According to the scheme, the electromagnetic interference in the control signal of the electric control unit of the automobile is filtered, so that the control reliability of the electric control unit is improved.

Description

Interference signal filtering device, automobile and interference signal filtering method of automobile
Technical Field
The invention belongs to the technical field of automobiles, particularly relates to an interference signal filtering device, an automobile and an interference signal filtering method thereof, and particularly relates to a vehicle-mounted wake-up circuit for automatically filtering an interference signal, an automobile and an interference signal filtering method thereof.
Background
With the rapid development of science and technology, new energy automobiles gradually enter the lives of people. An electric control unit (such as a Vehicle Control Unit (VCU)) of a new energy automobile is composed of various electronic components, and the various electronic components can generate a lot of electromagnetic interference during working, can cause misoperation of a circuit controlled by the electric control unit in serious cases, and has great potential safety hazards.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide an interference signal filtering device, an automobile and an interference signal filtering method thereof, so as to solve the problem that the control reliability of an electric control unit of the automobile is influenced due to electromagnetic interference in a control signal of the electric control unit of the automobile, and achieve the effect of improving the control reliability of the electric control unit by filtering the electromagnetic interference in the control signal of the electric control unit of the automobile.
The invention provides an interference signal filtering device, comprising: a first filtering unit and a second filtering unit; the first filtering unit is configured to filter an electromagnetic interference signal in an input control signal to obtain a first control signal; the control signal is a control signal of an interference signal to be filtered; the control signal comprises: a wake-up signal of a vehicle controller of the vehicle; the second filtering unit is configured to filter a strong electric interference signal in the first control signal to obtain a second control signal, and the second control signal is used as an effective control signal after the interference signal is filtered from the control signal.
In some embodiments, the first filtering unit includes: the device comprises a comparison unit, a delay unit and a logic processing unit; wherein, first filtering unit filters the electromagnetic interference signal in the control signal of input, obtains first control signal, includes: the comparison unit is configured to compare the voltage of the control signal with a set reference voltage so as to output a first filtered signal when the voltage of the control signal is greater than the reference voltage; the time delay unit is configured to delay the voltage of the control signal and output a second filtered signal; the logic processing unit is configured to perform logic processing on the first filtered signal and the second filtered signal and output a first control signal.
In some embodiments, the comparison unit includes: the device comprises a first sampling module, a comparator and a first switching tube; the first sampling module is used for sampling the voltage of the control signal to obtain a sampling voltage; the sampling voltage is input to a non-inverting input end of the comparator; the inverting input end of the comparator can input the reference voltage; the output end of the comparator outputs a switching-on signal to the control end of the first switch tube under the condition that the voltage of the control signal is greater than the reference voltage, and the output end of the first switch tube outputs a first filtering signal under the condition that the first switch tube is switched on based on the switch communication.
In some embodiments, the first sampling module comprises: the first voltage division module and the second voltage division module; the first voltage division module and the second voltage division module are arranged in series, and a common end of the first voltage division module and the second voltage division module is connected to a non-inverting input end of the comparator.
In some embodiments, the comparing unit further includes: a reference voltage module and a first protection module; the reference voltage passes through the reference voltage module and then is input to the inverting input end of the comparator; the first protection module is arranged at the output end of the first switch tube.
In some embodiments, the delay unit includes: the charging module, the adjusting module and the second switch tube; the voltage of the control signal charges the charging module; the adjusting module can adjust the charging time of the charging module; and under the condition that the charging voltage of the charging module reaches the switching-on voltage of the second switching tube, the second switching tube is switched on and outputs a second filtering signal.
In some embodiments, the charging module comprises: the device comprises a resistor module and a capacitor module; the adjustment module includes: a voltage regulator diode; the voltage of the control signal is charged to the capacitor module through the resistor module; the common end of the resistance module and the capacitance module is connected to the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is connected to the control end of the second switch tube.
In some embodiments, the delay unit further includes: the device comprises a discharge module, a second protection module and a third protection module; the discharging module is connected with the resistance module in parallel to discharge the electric quantity obtained by charging the capacitor module; the second protection module is arranged at the anode of the voltage stabilizing diode; and the third protection module is arranged at the output end of the second switch tube.
In some embodiments, the logical processing unit includes: and an AND gate.
In some embodiments, the second filtering unit includes: the second sampling module and the optical coupling module; and the second sampling module samples the first control signal, and outputs the second control signal after the first control signal is isolated and processed by the optical coupling module.
In some embodiments, the second sampling module comprises: the third voltage division module and the fourth voltage division module; the third voltage division module and the fourth voltage division module are arranged in series, and the common end of the third voltage division module and the common end of the fourth voltage division module are connected to the input end of the optical coupling module.
In some embodiments, the second filtering unit further includes: a fourth protection module; and the fourth protection module is arranged at the output end of the optical coupling module.
In accordance with the above apparatus, a further aspect of the present invention provides an automobile comprising: the interference signal filtering device is described above.
In another aspect, the present invention provides a method for filtering an interference signal of an automobile, including: filtering electromagnetic interference signals in the input control signals through a first filtering unit to obtain first control signals; the control signal is a control signal of an interference signal to be filtered; the control signal comprises: a wake-up signal of a vehicle controller of the vehicle; and filtering the strong electric interference signal in the first control signal through a second filtering unit to obtain a second control signal which is used as an effective control signal after the interference signal is filtered from the control signal.
In some embodiments, the filtering, by a first filtering unit, an electromagnetic interference signal in the input control signal to obtain a first control signal includes: comparing the voltage of the control signal with a set reference voltage through a comparison unit so as to output a first filtered signal under the condition that the voltage of the control signal is greater than the reference voltage; delaying the voltage of the control signal through a delay unit, and outputting a second filtering signal; and logically processing the first filtered signal and the second filtered signal through a logic processing unit, and outputting a first control signal.
In some embodiments, the filtering, by a second filtering unit, a strong electrical interference signal in the first control signal to obtain a second control signal includes: and the first control signal is isolated through an optocoupler module, and the second control signal is output.
Therefore, according to the scheme provided by the invention, the electromagnetic interference mixed in the control signal of the electric control unit of the automobile is filtered, the control signal after the electromagnetic interference is filtered is subjected to time delay and logic processing to obtain an accurate control signal, and the electromagnetic interference in the control signal of the electric control unit of the automobile is filtered to improve the control reliability of the electric control unit.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an interference signal filtering apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of a wake-up circuit for automatically filtering an interference signal;
FIG. 3 is a flowchart illustrating an interference signal filtering method according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an embodiment of filtering the electromagnetic interference signal in the input control signal according to the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
According to an embodiment of the present invention, there is provided an interference signal filtering apparatus. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The interference signal filtering apparatus may include: the device comprises a first filtering unit and a second filtering unit. The first filtering unit is for example an electromagnetic interference filtering unit, and the second filtering unit is for example a strong electrical interference filtering unit.
The first filtering unit is configured to filter an electromagnetic interference signal in an input control signal to obtain a first control signal. The control signal is a control signal of the interference signal to be filtered. The control signal comprises: and (4) a wake-up signal of a vehicle controller of the automobile. A Vehicle Control Unit (VCU) of an automobile is provided with a plurality of paths of wake-up signals, such as a charging wake-up signal, an ignition wake-up signal, a photovoltaic charging wake-up signal and the like, and the quality of the wake-up signals determines whether the Vehicle Control Unit (VCU) can reliably work, so that the electrical safety of the whole automobile is ensured.
The second filtering unit is configured to filter a strong electric interference signal in the first control signal to obtain a second control signal, and the second control signal is used as an effective control signal after the interference signal is filtered from the control signal.
Therefore, by filtering electromagnetic interference signals mixed in the control signals, only effective control signals can be identified by a control chip such as an MCU; meanwhile, by filtering out strong electric interference signals mixed in the control signals, the control chip such as the MCU can be better ensured not to be interfered by the strong electric signals of the equipment controlled by the control signals. When the control signal is an awakening signal of an electric control unit of an automobile, such as a Vehicle Control Unit (VCU), the logic AND operation is performed after filtering an interference signal mixed in the awakening signal, so that only an effective awakening signal can be identified by the MCU; meanwhile, by filtering strong current interference signals mixed in the wake-up signals, the MCU is better ensured not to be interfered by strong current signals of the whole automobile, and the control reliability of an electric control unit of the automobile is improved.
In some embodiments, the first filtering unit includes: the device comprises a comparison unit, a delay unit and a logic processing unit. The comparison unit is a comparison circuit, the delay unit is a delay circuit, the logic processing unit is a logic processing circuit, and the logic processing circuit comprises an AND gate.
Wherein, first filtering unit filters the electromagnetic interference signal in the control signal of input, obtains first control signal, includes:
the comparison unit is configured to compare the voltage of the control signal with a set reference voltage, so as to output a first filtered signal when the voltage of the control signal is greater than the reference voltage, that is, an electromagnetic interference signal whose amplitude does not meet the requirement of the reference voltage is filtered from the voltage of the control signal, such as the voltage of the wake-up signal, by a comparison unit, such as a comparison circuit.
In some embodiments, the comparison unit includes: a first sampling module, a comparator (such as comparator A)1) And a first switch tube (e.g. a triode Q)1)。
Wherein, theAnd the first sampling module is used for sampling the voltage of the control signal to obtain a sampling voltage. And the sampling voltage is input to a non-inverting input end of the comparator. The inverting input terminal of the comparator is capable of inputting the reference voltage. The output end of the comparator outputs a turn-on signal to the control end of the first switch tube (such as a triode Q) under the condition that the voltage of the control signal is greater than the reference voltage1Base of) the output terminal of the first switching tube (e.g., transistor Q)1Emitter) outputs a first filtered signal if the first switching tube is turned on based on the switching communication. The first filtered signal may be a voltage (e.g., a first voltage V)1) And the voltage abrupt change signal is suddenly changed from low level to high level.
In some embodiments, the first sampling module comprises: first voltage division module (such as resistor R)1) And a second voltage dividing module (e.g., resistor R)2)。
The first voltage division module and the second voltage division module are arranged in series, and a common end of the first voltage division module and the second voltage division module is connected to a non-inverting input end of the comparator.
In some embodiments, the comparing unit further includes: reference voltage module (e.g. resistor R)3) And a first protection module (e.g. resistor R)4)。
The reference voltage module is connected to the inverting input end of the comparator, and the reference voltage passes through the reference voltage module and then is input to the inverting input end of the comparator. The first protection module is arranged at the output end of the first switch tube.
Referring to the example shown in FIG. 2, the voltage of the original control signal (e.g., the voltage V of the wake-up signal of the VCU)in) Through resistance R1Then obtaining a sampling voltage VBThe sampled voltage is input to a comparator A1The non-inverting input terminal of (1). Resistance R2Is connected to a comparator A1Between the non-inverting input of (a) and ground. Resistance R3Is connected to a comparator A1Between the inverting input of (a) and ground. Comparator A1The power supply of the transformer is connected with a direct current power supply VCC,comparator A1The ground terminal of (A) is grounded, and the comparator A1Is connected to the triode Q1Base electrode of the triode Q1The collector of the transistor is connected to a DC power supply VCC and a triode Q1Output a first voltage V1To the first input of the logic processing circuit, a triode Q1Also via a resistor R4And then grounded.
Voltage V of the wake-up signalinThrough a voltage dividing resistor R1And R2Then, and comparator A1Are connected to the non-inverting terminal of the first. Voltage V of the wake-up signalinThrough a voltage dividing resistor R1And R2The obtained sampling voltage VBWill be compared with a reference voltage VFA comparison is made. If the voltage V is sampledBReference voltage VFComparator A1Output high voltage to drive transistor Q1On, the first voltage V1Suddenly changing from low level to high level; if the voltage V is sampledBReference voltage V is less than or equal toFComparator A1Output low voltage to drive transistor Q1Off, first voltage V1The low level is kept unchanged.
Therefore, the wake-up signal is compared with the reference voltage to filter the interference signal with the amplitude lower than the reference voltage in the wake-up signal, only the real wake-up signal can pass through the comparison circuit, and authenticity of the wake-up signal is guaranteed.
The time delay unit is configured to delay the voltage of the control signal and output a second filtered signal, so as to filter and remove the electromagnetic interference signal of which the duration does not meet the set time in the voltage of the control signal, such as the voltage of the wake-up signal, through the time delay unit, such as the time delay circuit.
In some embodiments, the delay unit includes: charging module, regulating module and second switch tube (such as triode Q)2)。
And the voltage of the control signal charges the charging module. The adjusting module can adjust the charging time of the charging module. When the charging voltage of the charging module reaches the switching-on power of the second switch tubeAnd under the condition of voltage, the second switch tube is switched on and outputs a second filtering signal. The second filtered signal may be a voltage (e.g., a second voltage V)2) And the voltage abrupt change signal is suddenly changed from low level to high level.
In some embodiments, the charging module comprises: resistance module (such as resistor R)5) And a capacitive module (e.g., capacitor C1). The adjustment module includes: a zener diode (e.g., zener diode D2).
And the voltage of the control signal is charged to the capacitor module through the resistor module. The resistance module and the capacitance module are arranged in series, the common end of the resistance module and the capacitance module is connected to the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is connected to the control end of the second switch tube (such as a triode Q)2The base) of (a).
In some embodiments, the delay unit further includes: discharging module (e.g. diode D)1) A second protection module (such as a resistor R)6) And a third protection module (e.g., resistor R)7)。
The discharging module is connected in parallel with the resistance module to discharge the electric quantity obtained by charging the capacitor module. The second protection module is arranged at the anode of the voltage stabilizing diode. The third protection module is arranged at the output end of the second switch tube (such as a triode Q)2Emitter of (ii).
Specifically, referring to the example shown in FIG. 2, the voltage of the original control signal (e.g., the voltage V of the wake-up signal of the VCU)in) Through resistance R5And a capacitor C1Rear earth, diode D1And a resistor R5Parallel connected, diode D1Is connected to a resistor R5And a capacitor C1To the public terminal. Resistance R5And a capacitor C1Is connected to the zener diode D2The cathode of (1). Zener diode D2Anode of (2), resistance R6And then grounded. Zener diode D2Is also connected to the triode Q2The base of (1). Triode Q2Is connected to a dc power supply VCC,triode Q2Through a resistor R7And then grounded. Triode Q2And also outputs a second voltage V2To the second input of the logic processing circuit.
Voltage V of the wake-up signalinVia a resistance R5Capacitor C1Charging, the interference signal with the duration time lower than the charging time t is filtered by controlling the charging time, and only the effective wake-up signal can normally pass through the charging. The charging time t, i.e., the delay time, can be calculated by equation (1), where:
Figure BDA0002799930570000071
wherein, the resistance R5And a capacitor C1And forming an RC filter circuit, wherein R in the formula (1) is a resistor in the RC filter circuit, and C in the formula (1) is a capacitor in the RC filter circuit. VinFor inputting wake-up signal voltage, V0Is a capacitor C1Voltage at the initial moment of charging (i.e. filter capacitor C)1Initial voltage value of), VtIs a capacitor C1Voltage at time t of charging (i.e. filter capacitor C at time t)1Voltage value of). Diode D1For discharging the capacitance C1The amount of electricity of. Voltage stabilizing tube D2And is used for adjusting the delay time. When the capacitance C1To drive the transistor Q2At the time of voltage on, the triode Q2On, the second voltage V2Abruptly changing from low to high.
Therefore, the interference signals with the duration time lower than the delay time are filtered by the delay circuit, and the delay circuit can be configured according to actual requirements, so that accurate wake-up signals are obtained.
The logic processing unit is configured to perform logic processing on the first filtered signal and the second filtered signal and output a first control signal.
Therefore, when the control signal is an awakening signal of an electric control unit of an automobile, such as a Vehicle Control Unit (VCU), a comparison circuit and a delay circuit are added between the awakening signal and the MCU, so that the problem that the awakening signal is easily influenced by external electromagnetic interference is solved, the MCU of the whole automobile can avoid detecting the abnormal awakening signal, and the reliable action of the VCU is ensured.
In some embodiments, the logical processing unit includes: and an AND gate.
Specifically, the first input terminal of the AND gate can input a first voltage V1. A second input terminal of the AND gate capable of inputting a second voltage V2. The output end of the AND gate is connected to the isolation circuit.
Therefore, by filtering the electromagnetic interference mixed in the wake-up signal and then performing logical AND operation on the signal output by the comparison circuit and the delay circuit, the VCU is further ensured to be capable of identifying only the correct wake-up signal, the problem of misoperation of the whole vehicle controller due to the electromagnetic interference in related schemes is generally solved, and the interference signal mixed in the wake-up signal is effectively filtered.
In some embodiments, the second filtering unit (e.g., an isolation circuit) includes: a second sampling module and a light coupling module (e.g., light coupling module 3).
And the second sampling module samples the first control signal, and outputs the second control signal after the first control signal is isolated and processed by the optical coupling module.
Specifically, the isolation circuit is used for isolating a power management chip (such as an MCU) from a wake-up signal, and preventing the power management chip from being burned out due to an excessively high voltage of the wake-up signal.
In some embodiments, the second sampling module comprises: third voltage division module (such as resistor R)8) And a fourth voltage division module (such as a resistor R)9). The third voltage division module and the fourth voltage division module are arranged in series, and a common end of the third voltage division module and the fourth voltage division module is connected to an input end of the optical coupling module (such as an anode on a diode side in the optical coupling module O3).
In some embodiments, the second filtering unit further includes: fourth protective module (e.g. resistor R)10). The fourth protection module is arranged at the output end of the optical coupling module (such asTransistor-side collector in optocoupler module O3).
In particular, with reference to the example shown in fig. 2, the output of the logic processing circuit is connected via a resistor R8And a resistance R9Rear earth, resistor R8And a resistor R9Is connected to the optocoupler module Q3Anode at side of middle diode, optical coupling module Q3The cathode on the middle diode side is grounded. Optical coupling module Q3Collector via resistor R at the middle transistor side10A rear direct current power supply VCC and an optical coupling module Q3Emitter grounding at the side of the middle transistor, and optical coupling module Q3The collector of the middle transistor outputs the voltage of the final control signal (e.g. the voltage V of the active wake-up signal)out). A first voltage V1And a second voltage V2High level driving optocoupler module Q output by AND gate3On, optocoupler module Q3The voltage of the final control signal to be output (e.g. the voltage V of the active wake-up signal)out) Suddenly changing from high level to low level. Power management chip (such as MCU) of automobile identifies VoutThe VCU starts to work after the signal, and the VCU is changed from the awakening state to the normal working state.
Therefore, by setting the level value and the pulse duration of the wake-up signal required by the Vehicle Control Unit (VCU), only the normal wake-up signal can be identified by the wake-up circuit, the interference signal is effectively filtered, and the false operation of the wake-up circuit can be effectively prevented.
Through a large number of tests, the technical scheme of the invention filters electromagnetic interference mixed in the control signal of the electric control unit of the automobile, then carries out time delay and logic processing on the control signal after the electromagnetic interference is filtered to obtain an accurate control signal, and filters the electromagnetic interference in the control signal of the electric control unit of the automobile to improve the control reliability of the electric control unit.
According to the embodiment of the invention, the automobile corresponding to the interference signal filtering device is further provided. The automobile may include: the interference signal filtering device is described above.
How to eliminate the interference source and improve the working reliability of the circuit controlled by the electronic control unit has become a key research object. Because the quantity of on-vehicle automatically controlled unit is more, can consume the electric core energy of the power supply unit of vehicle in a large number, when not using the vehicle for a long time, electric core can be because automatically controlled unit power consumptive too much and can't normally start the vehicle.
The low power consumption is the most direct and effective method for saving energy of the power supply unit of the vehicle, and the vehicle-mounted electronic control unit is awakened through the corresponding awakening mode to enable the vehicle to normally work, so that the power consumption of the power supply unit of the vehicle is saved, and the service life of the battery cell can be prolonged.
The method has the advantages that a large number of interference signals can be generated when a Vehicle Control Unit (VCU) works, so that the Vehicle Control Unit (VCU) is triggered by mistake to enter a normal working state from low power consumption, the loss of battery cell energy of a power supply unit of a vehicle is accelerated, and the problems of great potential safety hazards are caused; or the Vehicle Control Unit (VCU) which normally works can not start normally due to the fact that the interference signal enters the dormant state from the normal working state. The scheme of the invention provides the vehicle-mounted wake-up circuit which is simple in circuit, quick in response, low in cost and reliable in performance, and can effectively filter interference signals and ensure the working reliability of a Vehicle Control Unit (VCU).
According to the vehicle-mounted wake-up circuit, the level value and the pulse duration of the wake-up signal required by a Vehicle Control Unit (VCU) are set, only the normal wake-up signal can be identified by the wake-up circuit, interference signals are effectively filtered, and false operation of the wake-up circuit can be effectively prevented. Therefore, all interference signals except the non-wake-up signal can be filtered, the Vehicle Control Unit (VCU) can be reliably woken up to enter a normal working mode from a low power consumption mode, the response speed is high, the cost is low, and software logic is not needed.
Specifically, according to the scheme of the invention, the comparison circuit and the delay circuit are added between the wake-up signal and the MCU, so that the problem that the wake-up signal is easily influenced by external electromagnetic interference is solved, the MCU of the whole vehicle can avoid detecting abnormal wake-up signals, and the reliable action of a Vehicle Control Unit (VCU) is ensured.
According to the scheme, the electromagnetic interference mixed in the wake-up signal is filtered, and then the logical AND operation is performed on the signal output by the comparison circuit and the delay circuit, so that the VCU (VCU) can be further ensured to only identify the correct wake-up signal, the problem of misoperation of the VCU due to the electromagnetic interference in related schemes is solved on the whole, and the interference signal mixed in the wake-up signal is effectively filtered.
The wake-up signal is compared with the reference voltage to filter out interference signals with amplitude values lower than the reference voltage in the wake-up signal, and only real wake-up signals can pass through the comparison circuit.
The interference signals with the duration time lower than the delay time are filtered by the delay circuit, and the delay circuit can be configured according to actual requirements, so that accurate wake-up signals are obtained.
The following describes an exemplary implementation of the scheme of the present invention with reference to the example shown in fig. 2.
A new energy automobile (such as a new energy bus) is provided with a plurality of electric control units, and when the automobile is not used for a long time, the automobile cannot be started normally due to the fact that storage battery feeding in an electric supply unit of the automobile. The Vehicle Controller Unit (VCU) of the vehicle is controlled to enter a low power consumption mode, so that the purposes of reducing the power consumption of the electric control unit and prolonging the service life of the battery cell are achieved. The Vehicle Control Unit (VCU) is provided with a plurality of paths of wake-up signals, such as a charging wake-up signal, an ignition wake-up signal, a photovoltaic charging wake-up signal and the like, and the quality of the wake-up signals determines whether the Vehicle Control Unit (VCU) can work reliably, so that the electrical safety of the vehicle is ensured.
A wake-up circuit that automatically filters out interfering signals may be seen in the example shown in fig. 2. As shown in fig. 2, the wake-up circuit for automatically filtering out interference signals includes: the circuit comprises a comparison circuit, a delay circuit, a logic processing circuit and an isolation circuit. The input end of the comparison circuit inputs the voltage of the original control signal (such as the voltage V of the wake-up signal of VCU)in). The comparison circuit is based on the voltage of the original control signal (e.g. the voltage V of the wake-up signal of VCU)in) First voltage V of output1And the input signal is input to a first input end of the logic processing circuit. The delay circuit is based on the voltage of the original control signal (e.g. the voltage V of the wake-up signal of VCU)in) Second voltage V of output2Input to a second input of the logic processing circuitAnd (4) an end. The output end of the logic processing circuit is connected to the isolation circuit, and the isolation circuit outputs the voltage of the final control signal (such as the voltage V of the effective wake-up signal) after the interference signal is filteredout). Voltage V of the active wake-up signaloutThe amount of switching of the active wake-up signal may be indicated.
Wherein, comparison circuit includes: resistance R1Resistance R2Resistance R3Resistance R4Comparator A1And a triode Q1. The voltage of the original control signal (e.g. the voltage V of the wake-up signal of the VCU)in) Through resistance R1Then obtaining a sampling voltage VBThe sampled voltage is input to a comparator A1The non-inverting input terminal of (1). Resistance R2Is connected to a comparator A1Between the non-inverting input of (a) and ground. Resistance R3Is connected to a comparator A1Between the inverting input of (a) and ground. Comparator A1The power supply end of the comparator A is connected with a direct current power supply VCC1The ground terminal of (A) is grounded, and the comparator A1Is connected to the triode Q1Base electrode of the triode Q1The collector of the transistor is connected to a DC power supply VCC and a triode Q1Output a first voltage V1To the first input of the logic processing circuit, a triode Q1Also via a resistor R4And then grounded.
A delay circuit, comprising: resistance R5Resistance R6And a resistance R7Capacitor C1Diode D1Diode D for voltage regulation2And a triode Q2. The voltage of the original control signal (e.g. the voltage V of the wake-up signal of the VCU)in) Through resistance R5And a capacitor C1Rear earth, diode D1And a resistor R5Parallel connected, diode D1Is connected to a resistor R5And a capacitor C1To the public terminal. Resistance R5And a capacitor C1Is connected to the zener diode D2The cathode of (1). Zener diode D2Anode of (2), resistance R6And then grounded. Zener diode D2Is also connected to the triode Q2The base of (1). IIIPolar tube Q2The collector of the triode is connected with a direct current power supply VCC and a triode Q2Through a resistor R7And then grounded. Triode Q2And also outputs a second voltage V2To the second input of the logic processing circuit.
A logic processing circuit comprising: and an AND gate. A first input terminal of the AND gate for inputting a first voltage V1. A second input terminal of the AND gate capable of inputting a second voltage V2. The output end of the AND gate is connected to the isolation circuit.
An isolation circuit, comprising: resistance R8Resistance R9And a resistance R10Optocoupler module Q3. The output terminal of the logic processing circuit is connected via a resistor R8And a resistance R9Rear earth, resistor R8And a resistor R9Is connected to the optocoupler module Q3Anode at side of middle diode, optical coupling module Q3The cathode on the middle diode side is grounded. Optical coupling module Q3Collector via resistor R at the middle transistor side10A rear direct current power supply VCC and an optical coupling module Q3Emitter grounding at the side of the middle transistor, and optical coupling module Q3The collector of the middle transistor outputs the voltage of the final control signal (e.g. the voltage V of the active wake-up signal)out)。
In the example shown in fig. 2, when the control signal is a wake-up signal of a Vehicle Control Unit (VCU), the comparison circuit and the delay circuit are added on the basis of the wake-up signal to filter an interference signal included in the wake-up signal, and after filtering, logical and operation is performed to ensure that only an effective wake-up signal can be identified by the MCU; meanwhile, the scheme of the invention also adds an isolation circuit, thereby better ensuring that the MCU is not interfered by strong electric signals of the whole vehicle.
In the example shown in fig. 2, when the control signal is a wake-up signal of a Vehicle Control Unit (VCU), the power management chip of the vehicle recognizes the wake-up signal to control whether the VCU wakes up. In the example shown in FIG. 2, VFFor the reference voltage, only the wake-up signal greater than the reference voltage is a valid signal; VCC is a supply voltage, which can be 3.3V or 5V, and is set according to actual needs.Specifically, the comparison circuit is used for filtering interference signals with amplitudes not meeting requirements, the delay circuit is used for filtering interference signals with durations not meeting requirements, and the isolation circuit is used for isolating a power management chip (such as an MCU) from wake-up signals and preventing the power management chip from being burnt out due to overhigh voltage of the wake-up signals.
Voltage V of the wake-up signalinThrough a voltage dividing resistor R1And R2Then, and comparator A1Are connected to the non-inverting terminal of the first. Voltage V of the wake-up signalinThrough a voltage dividing resistor R1And R2The obtained sampling voltage VBWill be compared with a reference voltage VFA comparison is made. If the voltage V is sampledBReference voltage VFComparator A1Output high voltage to drive transistor Q1On, the first voltage V1Suddenly changing from low level to high level; if the voltage V is sampledBReference voltage V is less than or equal toFComparator A1Output low voltage to drive transistor Q1Off, first voltage V1The low level is kept unchanged.
Voltage V of the wake-up signalinVia a resistance R5Capacitor C1Charging, the interference signal with the duration time lower than the charging time t is filtered by controlling the charging time, and only the effective wake-up signal can normally pass through the charging. The charging time t, i.e., the delay time, can be calculated by equation (1), where:
Figure BDA0002799930570000121
wherein, the resistance R5And a capacitor C1And forming an RC filter circuit, wherein R in the formula (1) is a resistor in the RC filter circuit, and C in the formula (1) is a capacitor in the RC filter circuit. VinFor inputting wake-up signal voltage, V0Is a capacitor C1Voltage at the initial moment of charging (i.e. filter capacitor C)1Initial voltage value of), VtIs a capacitor C1Voltage at time t of charging (i.e. filter capacitor C at time t)1Voltage value of).
Diode D1For discharging the capacitance C1The amount of electricity of. Voltage stabilizing tube D2And is used for adjusting the delay time. When the capacitance C1To drive the transistor Q2At the time of voltage on, the triode Q2On, the second voltage V2Suddenly changing from low level to high level, first voltage V1And a second voltage V2High level driving optocoupler module Q output by AND gate3On, optocoupler module Q3The voltage of the final control signal to be output (e.g. the voltage V of the active wake-up signal)out) Suddenly changing from high level to low level. Power management chip (such as MCU) of automobile identifies VoutThe VCU starts to work after the signal, and the VCU is changed from the awakening state to the normal working state.
The following is a specific example illustrating the aspects of the present invention.
Voltage V of the wake-up signalinIs 12V, resistance R1Is 2K, the resistance R1Is 1K, reference voltage VFThe voltage amplitude is set to be 3V, and only signals with the voltage amplitude larger than 9V can normally pass through the comparison circuit;
resistance R5Is 10K, a capacitor C1100uF, a voltage stabilizing diode D2The voltage of (2) is 7V, and as can be seen from the formula (1), the first voltage V1 is 12V, and the capacitor C1Initial voltage V of0Is 0V, a capacitance C1T time voltage VtIs 7.7V because of the triode Q2The on-state voltage of the voltage regulator is 0.7V, and a voltage regulator tube D2Has a stable voltage of 7V, so that only the capacitor C is used1The charged voltage of the triode Q is more than 7.7V2And conducting. The delay time can be calculated to be 1S, so that only signals with the duration time larger than 1S can pass through the delay circuit.
Therefore, only the signal with the amplitude larger than 9V and the duration larger than 1S can be identified as the correct wake-up signal by the power management chip, and various interference signals can be filtered by the filter circuit, so that the quality of the wake-up signal is ensured, and the reliability of the wake-up circuit is improved.
Since the processing and functions of the automobile of this embodiment are basically corresponding to the embodiment, principle and example of the device shown in fig. 1, the description of this embodiment is not given in detail, and reference may be made to the related description in the foregoing embodiment, which is not described herein again.
Through a large number of tests, the technical scheme of the invention filters electromagnetic interference mixed in the control signal of the electric control unit of the automobile, and then carries out time delay and logic processing on the control signal after electromagnetic interference is filtered to obtain an accurate control signal.
According to an embodiment of the present invention, a method for filtering an interference signal of an automobile corresponding to the automobile is also provided, as shown in fig. 3, which is a schematic flow chart of an embodiment of the method of the present invention. The interference signal filtering method of the automobile may include: step S110 and step S120.
In step S110, the first filtering unit filters an electromagnetic interference signal in the input control signal to obtain a first control signal. The control signal is a control signal of the interference signal to be filtered. The control signal comprises: and (4) a wake-up signal of a vehicle controller of the automobile. A Vehicle Control Unit (VCU) of an automobile is provided with a plurality of paths of wake-up signals, such as a charging wake-up signal, an ignition wake-up signal, a photovoltaic charging wake-up signal and the like, and the quality of the wake-up signals determines whether the Vehicle Control Unit (VCU) can reliably work, so that the electrical safety of the whole automobile is ensured.
In some embodiments, in step S110, a specific process of filtering the electromagnetic interference signal in the input control signal by a first filtering unit to obtain a first control signal is described in the following exemplary description.
The following further describes, with reference to a schematic flow chart of an embodiment of filtering the electromagnetic interference signal in the input control signal in the method of the present invention shown in fig. 4, a specific process of filtering the electromagnetic interference signal in the input control signal in step S110, including: step S210 to step S230.
Step S210, comparing the voltage of the control signal with a set reference voltage by a comparing unit, so as to output a first filtered signal when the voltage of the control signal is greater than the reference voltage, that is, filtering out an electromagnetic interference signal whose amplitude does not meet the requirement of the reference voltage in the voltage of the control signal, such as the voltage of the wake-up signal, by a comparing unit, such as a comparing circuit.
Step S220, delaying the voltage of the control signal by a delay unit, and outputting a second filtered signal, so as to filter and remove the electromagnetic interference signal whose duration does not meet the set time in the voltage of the control signal, such as the voltage of the wake-up signal, by the delay unit, such as a delay circuit.
Step S230, performing logic processing on the first filtered signal and the second filtered signal through a logic processing unit, and outputting a first control signal.
Therefore, when the control signal is an awakening signal of an electric control unit of an automobile, such as a Vehicle Control Unit (VCU), a comparison circuit and a delay circuit are added between the awakening signal and the MCU, so that the problem that the awakening signal is easily influenced by external electromagnetic interference is solved, the MCU of the whole automobile can avoid detecting the abnormal awakening signal, and the reliable action of the VCU is ensured.
In step S120, a second filtering unit filters a strong electrical interference signal in the first control signal to obtain a second control signal, which is used as an effective control signal after the interference signal is filtered from the control signal.
Therefore, by filtering electromagnetic interference signals mixed in the control signals, only effective control signals can be identified by a control chip such as an MCU; meanwhile, by filtering out strong electric interference signals mixed in the control signals, the control chip such as the MCU can be better ensured not to be interfered by the strong electric signals of the equipment controlled by the control signals. When the control signal is an awakening signal of an electric control unit of an automobile, such as a Vehicle Control Unit (VCU), the logic AND operation is performed after filtering an interference signal mixed in the awakening signal, so that only an effective awakening signal can be identified by the MCU; meanwhile, by filtering strong current interference signals mixed in the wake-up signals, the MCU is better ensured not to be interfered by strong current signals of the whole automobile, and the control reliability of an electric control unit of the automobile is improved.
In some embodiments, the filtering, by the second filtering unit, a strong electrical interference signal in the first control signal to obtain a second control signal in step S120 includes: and the first control signal is isolated through an optocoupler module, and the second control signal is output.
Specifically, the isolation circuit is used for isolating a power management chip (such as an MCU) from a wake-up signal, and preventing the power management chip from being burned out due to an excessively high voltage of the wake-up signal.
Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles and examples of the automobile, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment, which is not described herein.
Through a large number of tests, the technical scheme of the embodiment is adopted, electromagnetic interference mixed in the control signal of the electric control unit of the automobile is filtered, the control signal after the electromagnetic interference is filtered is subjected to time delay and logic processing, an accurate control signal is obtained, when the control signal is a wake-up signal of a Vehicle Control Unit (VCU), all interference signals except the wake-up signal can be filtered, the Vehicle Control Unit (VCU) can be reliably woken up to enter a normal working mode from a low power consumption mode, the response speed is high, the cost is low, and software logic is not needed.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (16)

1. An interference signal filtering apparatus, comprising: a first filtering unit and a second filtering unit; wherein,
the first filtering unit is configured to filter electromagnetic interference signals in the input control signals to obtain first control signals; the control signal is a control signal of an interference signal to be filtered; the control signal comprises: a wake-up signal of a vehicle controller of the vehicle;
the second filtering unit is configured to filter a strong electric interference signal in the first control signal to obtain a second control signal, and the second control signal is used as an effective control signal after the interference signal is filtered from the control signal.
2. The interference signal filtering device according to claim 1, wherein the first filtering unit includes: the device comprises a comparison unit, a delay unit and a logic processing unit; wherein,
the first filtering unit filters electromagnetic interference signals in the input control signals to obtain first control signals, and the first filtering unit comprises:
the comparison unit is configured to compare the voltage of the control signal with a set reference voltage so as to output a first filtered signal when the voltage of the control signal is greater than the reference voltage;
the time delay unit is configured to delay the voltage of the control signal and output a second filtered signal;
the logic processing unit is configured to perform logic processing on the first filtered signal and the second filtered signal and output a first control signal.
3. The interference signal filtering device according to claim 2, wherein the comparing unit includes: the device comprises a first sampling module, a comparator and a first switching tube; wherein,
the first sampling module is used for sampling the voltage of the control signal to obtain a sampling voltage; the sampling voltage is input to a non-inverting input end of the comparator; the inverting input end of the comparator can input the reference voltage; the output end of the comparator outputs a switching-on signal to the control end of the first switch tube under the condition that the voltage of the control signal is greater than the reference voltage, and the output end of the first switch tube outputs a first filtering signal under the condition that the first switch tube is switched on based on the switch communication.
4. The interference signal filtering device according to claim 3, wherein the first sampling module includes: the first voltage division module and the second voltage division module; wherein,
the first voltage division module and the second voltage division module are arranged in series, and the common end of the first voltage division module and the common end of the second voltage division module are connected to the non-inverting input end of the comparator.
5. The interference signal filtering device according to claim 3, wherein the comparing unit further includes: a reference voltage module and a first protection module; wherein,
the reference voltage passes through the reference voltage module and then is input to the inverting input end of the comparator; the first protection module is arranged at the output end of the first switch tube.
6. The interference signal filtering device according to claim 2, wherein the delay unit includes: the charging module, the adjusting module and the second switch tube; wherein,
the voltage of the control signal charges the charging module; the adjusting module can adjust the charging time of the charging module; and under the condition that the charging voltage of the charging module reaches the switching-on voltage of the second switching tube, the second switching tube is switched on and outputs a second filtering signal.
7. The interference signal filtering device according to claim 6, wherein the charging module includes: the device comprises a resistor module and a capacitor module; the adjustment module includes: a voltage regulator diode; wherein,
the voltage of the control signal is charged to the capacitor module through the resistor module; the common end of the resistance module and the capacitance module is connected to the cathode of the voltage stabilizing diode, and the anode of the voltage stabilizing diode is connected to the control end of the second switch tube.
8. The interference signal filtering device according to claim 7, wherein the delay unit further comprises: the device comprises a discharge module, a second protection module and a third protection module; wherein,
the discharging module is connected with the resistance module in parallel to discharge the electric quantity obtained by charging the capacitor module; the second protection module is arranged at the anode of the voltage stabilizing diode; and the third protection module is arranged at the output end of the second switch tube.
9. The interference signal filtering device according to claim 2, wherein the logic processing unit comprises: and an AND gate.
10. The interference signal filtering device according to any one of claims 1 to 9, wherein the second filtering unit includes: the second sampling module and the optical coupling module; wherein,
and the second sampling module samples the first control signal, and outputs the second control signal after the first control signal is isolated and processed by the optocoupler module.
11. The interference signal filtering device according to claim 10, wherein the second sampling module includes: the third voltage division module and the fourth voltage division module;
the third voltage division module and the fourth voltage division module are arranged in series, and the common end of the third voltage division module and the common end of the fourth voltage division module are connected to the input end of the optical coupling module.
12. The interference signal filtering device according to claim 10, wherein the second filtering unit further includes: a fourth protection module; and the fourth protection module is arranged at the output end of the optical coupling module.
13. An automobile, comprising: the interference signal filtering device according to any one of claims 1 to 12.
14. A method for filtering an interference signal of a vehicle according to claim 13, comprising:
filtering electromagnetic interference signals in the input control signals through a first filtering unit to obtain first control signals; the control signal is a control signal of an interference signal to be filtered; the control signal comprises: a wake-up signal of a vehicle controller of the vehicle;
and filtering the strong electric interference signal in the first control signal through a second filtering unit to obtain a second control signal which is used as an effective control signal after the interference signal is filtered from the control signal.
15. The method for filtering interference signals of an automobile according to claim 14, wherein the step of filtering electromagnetic interference signals in the input control signals by a first filtering unit to obtain the first control signals comprises:
comparing the voltage of the control signal with a set reference voltage through a comparison unit so as to output a first filtered signal under the condition that the voltage of the control signal is greater than the reference voltage;
delaying the voltage of the control signal through a delay unit, and outputting a second filtering signal;
and logically processing the first filtered signal and the second filtered signal through a logic processing unit, and outputting a first control signal.
16. The method for filtering interference signals of an automobile according to claim 14 or 15, wherein the step of filtering a strong electrical interference signal in the first control signal by a second filtering unit to obtain a second control signal comprises:
and the first control signal is isolated through an optocoupler module, and the second control signal is output.
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