CN107910859B - Protection device of electronic control unit - Google Patents
Protection device of electronic control unit Download PDFInfo
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- CN107910859B CN107910859B CN201711454907.5A CN201711454907A CN107910859B CN 107910859 B CN107910859 B CN 107910859B CN 201711454907 A CN201711454907 A CN 201711454907A CN 107910859 B CN107910859 B CN 107910859B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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Abstract
The invention provides a protection device of an electronic control unit, wherein a voltage protection circuit in the device can identify an input target voltage signal, and when the target voltage signal is identified as reverse electromotive force generated by a target load moment, the reverse electromotive force can be released, so that the reverse electromotive force is prevented from being input to a T15 pin of the electronic control unit, and the T15 pin of the electronic control unit is permanently and effectively protected. In addition, the protection device of the electronic control unit can also stabilize the voltage input to the pin T15 within the normal working range of the electronic control unit through the signal processing circuit and the voltage stabilizing circuit, so that the voltage fluctuation of the pin T15 of the electronic control unit caused by the fluctuation of the input voltage is avoided, and then the ECU is reset to influence the operation of an engine.
Description
Technical Field
The invention relates to the technical field of electric control engines, in particular to a protection device of an electronic control unit.
Background
At present, the amplitude and time of reverse electromotive force which can be born by a T15 pin of an electronic control unit (Electronic Control Unit, ECU) of an electric control engine are limited, and traditional protection measures often depend on the fact that an electric device such as an isolation relay, a freewheel diode and the like is added in a whole vehicle electric appliance circuit to isolate and freewheel the electromotive force reversely flowing into the T15 pin, so that the protection effect on the T15 pin is achieved. However, the aging and vibration, corrosion, high temperature and other factors of the whole vehicle wire harness may cause the failure of the isolating relay or breakdown of the freewheeling diode, that is, the risk of breakdown still exists in the T15 pin of the electronic control unit, and the risk probability is high. Therefore, it is desirable to provide a protection device that can permanently and effectively protect the T15 pin of the electronic control unit.
Disclosure of Invention
In view of this, the present invention provides a protection device for an electronic control unit, which is used for permanently and effectively protecting a T15 pin of the electronic control unit, and the technical scheme is as follows:
a protection device for an electronic control unit, comprising: a voltage protection circuit;
the voltage protection circuit is connected between the key switch and the electronic control unit, and is used for receiving a target voltage signal when the key switch acts, determining whether the target voltage signal is reverse electromotive force generated instantaneously by a target load, and releasing the target voltage signal when the target voltage signal is reverse electromotive force generated instantaneously by the target load.
Preferably, the protection device of the electronic control unit further comprises: a signal processing circuit and a voltage stabilizing circuit;
The input end of the voltage protection circuit is connected with the key switch, the output end of the voltage protection circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is connected with a T15 pin of the electronic control unit;
the voltage protection circuit outputs the target voltage signal to the signal processing circuit when the target voltage signal is not a counter electromotive force generated at the target load moment;
the signal processing circuit is used for receiving the target voltage signal output by the voltage protection circuit, judging whether the target voltage signal needs to be subjected to attenuation processing or amplification processing based on the amplitude of the target voltage signal, if yes, carrying out attenuation processing or amplification processing on the target voltage signal, and outputting the processed voltage signal to the voltage stabilizing circuit, otherwise, directly outputting the target voltage signal to the voltage stabilizing circuit;
The voltage stabilizing circuit receives the voltage signal output by the signal processing circuit, carries out voltage stabilizing processing on the voltage signal output by the signal processing circuit, and outputs the voltage signal after the voltage stabilizing processing to a T15 pin of the electronic control unit.
Wherein, the voltage protection circuit includes: a voltage comparing unit and a voltage releasing unit;
The voltage comparing unit compares the amplitude of the target voltage signal with a first preset value, outputs the target voltage signal to the voltage releasing unit when the amplitude of the target voltage signal is larger than the first preset value and the duration of the target voltage signal is smaller than a first preset duration, and outputs the target voltage signal to the signal processing circuit when the amplitude of the target voltage signal is smaller than or equal to the first preset value and the duration of the target voltage signal is larger than a second preset duration;
The voltage releasing unit is used for releasing the target voltage signal.
The voltage comparing unit is a voltage comparator, and the voltage releasing unit is a piezoresistor;
the input end of the voltage comparator is connected with the key switch, the first output end of the voltage comparator is connected with the input end of the signal processing circuit, the second output end of the voltage comparator is connected with the first end of the piezoresistor, and the second end of the piezoresistor is grounded;
The voltage comparator is used for comparing the amplitude of the target voltage signal with a first preset value, when the amplitude of the target voltage signal is larger than the first preset value and the duration of the target voltage signal is smaller than the first preset duration, the second channel is conducted, the target voltage signal is output to the piezoresistor through the second output end, and when the amplitude of the target voltage signal is smaller than or equal to the first preset value and the duration of the target voltage signal is larger than the second preset duration, the first channel is conducted, and the target voltage signal is output to the signal processing circuit through the first output end;
And the piezoresistor releases the target voltage signal output by the second output end of the voltage comparator.
Wherein the signal processing circuit includes: a voltage comparing unit and a signal processing unit;
The voltage comparing unit compares the amplitude of the target voltage signal with a second preset value and a third preset value, outputs the target voltage signal to the signal processing unit when the amplitude of the target voltage signal is greater than the second preset value or the amplitude of the target voltage signal is less than the third preset value, and outputs the target voltage signal to the voltage stabilizing circuit when the amplitude of the target voltage signal is greater than or equal to the third preset value and the amplitude of the target voltage signal is less than or equal to the second preset value;
The signal processing unit is used for carrying out attenuation processing or amplification processing on the target voltage signal, processing the target voltage signal into a voltage signal with a preset amplitude, and outputting the voltage signal with the preset amplitude to the voltage stabilizing circuit, wherein the preset amplitude is larger than the third preset value and smaller than the second preset value.
Wherein the voltage comparing unit is a voltage comparator, and the signal processing unit includes: an attenuation circuit and an amplification circuit;
The input end of the voltage comparator is connected with the output end of the voltage protection circuit, the first output end of the voltage comparator is connected with the input end of the attenuation circuit, the output end of the attenuation circuit is connected with the first input end of the voltage stabilizing circuit, the second output end of the voltage comparator is connected with the input end of the amplifying circuit, the output end of the amplifying circuit is connected with the second input end of the voltage stabilizing circuit, and the third output end of the voltage comparator is connected with the third input end of the voltage stabilizing circuit;
The voltage comparator is used for comparing the amplitude of the target voltage signal with a second preset value and a third preset value, when the amplitude of the target voltage signal is larger than the second preset value, the first channel is conducted, the target voltage signal is output to the attenuation circuit through the first output end, when the amplitude of the target voltage signal is smaller than the third preset value, the second channel is conducted, the target voltage signal is output to the amplifying circuit through the second output end, and when the amplitude of the target voltage signal is larger than or equal to the third preset value, and when the amplitude of the target voltage signal is smaller than or equal to the second preset value, the third channel is conducted, and the target voltage signal is output to the voltage stabilizing circuit through the third output end;
The attenuation circuit is used for carrying out attenuation processing on the target voltage signal with the amplitude value larger than the second preset value and outputting the voltage signal with the preset amplitude value to the voltage stabilizing circuit;
the amplifying circuit is used for amplifying the target voltage signal with the amplitude smaller than the third preset value and outputting the voltage signal with the preset amplitude to the voltage stabilizing circuit.
The attenuation circuit is further used for filtering the target voltage signal with the amplitude being larger than the second preset value;
The amplifying circuit is further used for conducting filtering processing on the target voltage signal with the amplitude smaller than the third preset value.
The voltage protection circuit, the signal processing circuit and the voltage stabilizing circuit are packaged on the PCB.
Wherein, the protection device of the electronic control unit further comprises: a package housing;
The voltage protection circuit, the signal processing circuit and the voltage stabilizing circuit are arranged in the packaging shell, and the packaging shell is provided with a signal trend identifier.
The first end of the protection device of the electronic control unit is connected with the key switch in a plug-in connector mode, and the second end of the protection device of the electronic control unit is connected with a T15 pin of the electronic control unit in a plug-in connector mode.
The technical scheme has the following beneficial effects:
In the protection device of the electronic control unit, the voltage protection circuit can identify the input target voltage signal, and when the target voltage signal is identified as the reverse induced electromotive force generated by the target load instantaneously after the key switch is powered off, the reverse induced electromotive force can be released, so that the reverse electromotive force is prevented from being input to the T15 pin of the electronic control unit, and the T15 pin of the electronic control unit is permanently and effectively protected. In addition, the protection device of the electronic control unit provided by the invention stabilizes the voltage input to the pin T15 within the normal working range of the electronic control unit through the signal processing circuit and the voltage stabilizing circuit, so that the voltage fluctuation of the pin T15 of the electronic control unit caused by the fluctuation of the input voltage is avoided, and then the ECU is reset to influence the operation of an engine.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electronic control unit protection device according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a protection device for an electronic control unit according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an embodiment of an electronic control unit protection device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic structural diagram of the device is shown, and the device may include a voltage protection circuit 101 connected between a key switch and an electronic control unit, and configured to receive a target voltage signal when the key switch is operated, determine whether the target voltage signal is a reverse electromotive force generated instantaneously by a target load, and release the target voltage signal when the target voltage signal is a reverse electromotive force generated instantaneously by the target load.
Preferably, the electronic control unit protection device provided by the embodiment of the present invention may further include: a signal processing circuit 102 and a voltage stabilizing circuit 103.
The input end of the voltage protection circuit 101 is connected with the key switch, the output end of the voltage protection circuit 101 is connected with the input end of the signal processing circuit 102, the output end of the signal processing circuit 102 is connected with the input end of the voltage stabilizing circuit 103, and the output end of the voltage stabilizing circuit 103 is connected with a T15 pin of the electronic control unit.
The voltage protection circuit 101 outputs the target voltage signal to the signal processing circuit 102 when the target voltage signal is not the back electromotive force generated at the target load moment.
The signal processing circuit 102 receives the target voltage signal output by the voltage protection circuit, determines whether the target voltage needs to be processed based on the amplitude of the target voltage signal, if so, processes the target voltage, and outputs the processed voltage signal to the voltage stabilizing circuit 103, otherwise, directly outputs the target voltage signal to the voltage stabilizing circuit 103, wherein the processing is attenuation processing or amplification processing.
The voltage stabilizing circuit 103 receives the voltage signal output by the signal processing circuit 102, performs voltage stabilizing processing on the voltage signal output by the signal processing circuit, and outputs the voltage signal after the voltage stabilizing processing to a T15 pin of the electronic control unit.
In the protection device of the electronic control unit, the voltage protection circuit can identify the input target voltage signal, and when the target voltage signal is identified as the reverse induced electromotive force generated by the target load instantaneously after the key switch is powered off, the reverse induced electromotive force can be released, so that the reverse induced electromotive force is prevented from being input to the T15 pin of the electronic control unit, and the T15 pin of the electronic control unit is permanently and effectively protected. In addition, the protection device of the electronic control unit provided by the embodiment of the invention stabilizes the voltage input to the pin T15 within the normal working range of the electronic control unit through the signal processing circuit and the voltage stabilizing circuit, so that the fluctuation of the input voltage is prevented from causing the fluctuation of the pin T15 of the electronic control unit, and then the ECU is reset to influence the operation of an engine.
In the electronic control unit protection device provided in the above embodiment, referring to fig. 2, the voltage protection circuit 101 may include: a voltage comparing unit 1011 and a voltage releasing unit 1012.
The voltage comparing unit 1011 compares the amplitude of the target voltage signal with a first preset value, outputs the target voltage signal to the voltage releasing unit when the amplitude of the target voltage signal is greater than the first preset value and the duration of the target voltage signal is less than a first preset time period, and outputs the target voltage signal to the signal processing circuit 102 when the amplitude of the target voltage signal is less than or equal to the first preset value and the duration of the target voltage signal is greater than a second preset time period.
The voltage releasing unit 1012 is configured to release the target voltage signal.
It should be noted that, if the amplitude of the target voltage signal is greater than the first preset value and the duration of the target voltage signal is less than the first preset duration, it indicates that the target voltage signal is the reverse electromotive force generated instantaneously by the target load after the key switch is powered off.
In the electronic control unit protection device provided in the above embodiment, referring to fig. 2, the signal processing circuit 102 may include: a voltage comparing unit 1021 and a signal processing unit 1022.
The voltage comparing unit 1021 compares the amplitude of the target voltage signal with the second preset value and the third preset value, outputs the target voltage signal to the signal processing unit when the amplitude of the target voltage signal is greater than the second preset value or the amplitude of the target voltage signal is less than the third preset value, and outputs the target voltage signal to the voltage stabilizing circuit 103 when the amplitude of the target voltage signal is greater than or equal to the third preset value and the amplitude of the target voltage signal is less than or equal to the second preset value.
The signal processing unit 1022 performs attenuation processing or amplification processing on the target voltage signal, processes the target voltage signal into a voltage signal with a preset amplitude, and outputs the voltage signal with the preset amplitude to the voltage stabilizing circuit 103, wherein the preset amplitude is greater than a third preset value and less than a second preset value.
On the basis of the above-mentioned embodiment of the present invention, the electronic control unit protection device provided by the embodiment of the present invention will now be described by way of a specific example. Referring to fig. 3, a schematic structural diagram of an embodiment of an electronic control unit protection device according to an embodiment of the present invention may include: voltage comparator 301, varistor 302, voltage comparator 303, decay circuit 304, amplification circuit 305, and voltage regulator circuit 306.
The voltage comparator 301 and the piezoresistor 302 form a voltage protection circuit, and the voltage comparator 303, the attenuation circuit 304 and the amplifying circuit 305 form a signal processing circuit.
The input end of the voltage comparator 301 is connected with the key switch, the first output end of the voltage comparator 301 is connected with the input end of the voltage comparator 303, the second output end of the voltage comparator 301 is connected with the first end of the piezoresistor 302, the second end of the piezoresistor 302 is grounded, the first output end of the voltage comparator 303 is connected with the input end of the attenuation circuit 304, the output end of the attenuation circuit 304 is connected with the first input end of the voltage stabilizing circuit 306, the second output end of the voltage comparator 303 is connected with the input end of the amplifying circuit 305, the output end of the amplifying circuit 305 is connected with the second input end of the voltage stabilizing circuit 306, and the third output end of the voltage comparator 303 is connected with the third input end of the voltage stabilizing circuit 306.
The voltage comparator 301 receives the target voltage signal when the key switch is operated, compares the amplitude of the target voltage signal with a first preset value (for example, 36V), when the amplitude of the target voltage signal is greater than the first preset value (for example, 36V) and the duration of the target voltage signal is less than a first preset time period (for example, 1 s), the second channel is turned on, the target voltage signal is output to the piezoresistor 302 through the second output terminal, when the amplitude of the target voltage signal is less than or equal to the first preset value (for example, 36V) and the duration of the target voltage signal is greater than a second preset time period (for example, 2 s), the first channel is turned on, and the target voltage signal is output to the voltage comparator 303 through the first output terminal.
It should be noted that, if the amplitude of the target voltage signal is greater than the first preset value and the duration of the target voltage signal is less than the first preset duration, it indicates that the target voltage signal is the reverse electromotive force generated instantaneously by the target load after the key switch is powered off. The piezoresistor 302 releases the reverse electromotive force, and the released reverse electromotive force directly flows into the negative electrode of the storage battery, so that the interference to the whole vehicle electrical equipment is avoided.
The voltage comparator 303 compares the amplitude of the target voltage signal with a second preset value (e.g., 32V) and a third preset value (e.g., 9V), when the amplitude of the target voltage signal is greater than the second preset value (e.g., 32V), the first channel is turned on, the target voltage signal is output to the attenuation circuit 304 through the first output terminal, when the amplitude of the target voltage signal is less than the third preset value (e.g., 9V), the second channel is turned on, the target voltage signal is output to the amplifying circuit 305 through the second output terminal, and when the amplitude of the target voltage signal is greater than or equal to the third preset value (e.g., 9V), and when the amplitude of the target voltage signal is less than or equal to the second preset value (e.g., 32V), the third channel is turned on, and the target voltage signal is output to the voltage stabilizing circuit 306 through the third output terminal.
The attenuation circuit 304 is configured to attenuate a target voltage signal with an amplitude greater than a second preset value (e.g. 32V), and output a voltage signal with a preset amplitude (e.g. 24V) to the voltage stabilizing circuit 306. In addition, the attenuation circuit can also carry out filtering processing on the target voltage signal with the amplitude larger than a second preset value, so as to filter burrs in the target voltage signal.
The amplifying circuit 305 is configured to amplify the target voltage signal with the amplitude smaller than the third preset value (e.g. 9V), and output a voltage signal with the preset amplitude (e.g. 24V) to the voltage stabilizing circuit 306. In addition, the amplifying circuit 305 may further perform filtering processing on the target voltage signal with the amplitude smaller than the third preset value, to filter out the glitch in the target voltage signal.
The voltage stabilizing circuit 306 receives the voltage signal output by the attenuation circuit 304, the amplifying circuit 305 or the voltage comparator 303, performs voltage stabilizing processing on the voltage signal output by the attenuation circuit 304, the amplifying circuit 305 or the voltage comparator 303, and outputs the voltage signal after the voltage stabilizing processing to a T15 pin of the electronic control unit.
In the protection device for the electronic control unit provided by the embodiment of the invention, the voltage comparator in the voltage protection circuit can identify the input target voltage signal, and when the target voltage signal is identified as the reverse induced electromotive force generated by the target load instantaneously after the key switch is powered off, the reverse electromotive force can be released through the piezoresistor, so that the reverse induced electromotive force is prevented from being input to the T15 pin of the electronic control unit, and the T15 pin of the electronic control unit is permanently and effectively protected. In addition, the protection device of the electronic control unit provided by the embodiment of the invention stabilizes the voltage input to the pin T15 within the normal working range of the electronic control unit through the voltage comparator, the amplifying circuit, the attenuation circuit and the voltage stabilizing circuit, so that the voltage fluctuation of the pin T15 of the electronic control unit caused by the fluctuation of the input voltage is avoided, and then the ECU is reset to influence the operation of an engine. The protection device of the electronic control unit provided by the embodiment of the invention has the advantages of simple circuit design, high reliability and no maintenance.
In the protection device for the electronic control unit provided by the embodiment, the voltage protection circuit, the signal processing circuit and the voltage stabilizing circuit are packaged on the PCB board, and an industrial manufacturing process is adopted to meet the index requirements of vibration, corrosion, high temperature, electromagnetic interference and the like of the whole vehicle, and the waterproof dust-discharging grade is IP65.
The protection device for an electronic control unit provided in the above embodiment may further include: and (5) packaging the shell. The voltage protection circuit, the signal processing circuit and the voltage stabilizing circuit are arranged in the packaging shell, and the signal trend identifier is arranged on the packaging shell, so that the whole vehicle is convenient to install.
The first end of the protection device of the electronic control unit provided by the embodiment is connected with the key switch in a plug-in connector mode, and the second end of the protection device of the electronic control unit is connected with a T15 pin of the electronic control unit in a plug-in connector mode.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and device may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A protection device for an electronic control unit, comprising: a voltage protection circuit;
The voltage protection circuit is connected between the key switch and the electronic control unit, and is used for receiving a target voltage signal when the key switch acts, determining whether the target voltage signal is reverse electromotive force generated instantaneously by a target load, and releasing the target voltage signal when the target voltage signal is reverse electromotive force generated instantaneously by the target load;
Further comprises: a signal processing circuit and a voltage stabilizing circuit;
The input end of the voltage protection circuit is connected with the key switch, the output end of the voltage protection circuit is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is connected with a T15 pin of the electronic control unit;
the voltage protection circuit outputs the target voltage signal to the signal processing circuit when the target voltage signal is not a counter electromotive force generated at the target load moment;
the signal processing circuit is used for receiving the target voltage signal output by the voltage protection circuit, judging whether the target voltage signal needs to be subjected to attenuation processing or amplification processing based on the amplitude of the target voltage signal, if yes, carrying out attenuation processing or amplification processing on the target voltage signal, and outputting the processed voltage signal to the voltage stabilizing circuit, otherwise, directly outputting the target voltage signal to the voltage stabilizing circuit;
The voltage stabilizing circuit receives the voltage signal output by the signal processing circuit, carries out voltage stabilizing processing on the voltage signal output by the signal processing circuit, and outputs the voltage signal after the voltage stabilizing processing to a T15 pin of the electronic control unit.
2. The protection device of an electronic control unit according to claim 1, wherein the voltage protection circuit comprises: a voltage comparing unit and a voltage releasing unit;
The voltage comparing unit compares the amplitude of the target voltage signal with a first preset value, outputs the target voltage signal to the voltage releasing unit when the amplitude of the target voltage signal is larger than the first preset value and the duration of the target voltage signal is smaller than a first preset duration, and outputs the target voltage signal to the signal processing circuit when the amplitude of the target voltage signal is smaller than or equal to the first preset value and the duration of the target voltage signal is larger than a second preset duration;
The voltage releasing unit is used for releasing the target voltage signal.
3. The protection device of an electronic control unit according to claim 2, wherein the voltage comparing unit is a voltage comparator, and the voltage releasing unit is a varistor;
the input end of the voltage comparator is connected with the key switch, the first output end of the voltage comparator is connected with the input end of the signal processing circuit, the second output end of the voltage comparator is connected with the first end of the piezoresistor, and the second end of the piezoresistor is grounded;
The voltage comparator is used for comparing the amplitude of the target voltage signal with a first preset value, when the amplitude of the target voltage signal is larger than the first preset value and the duration of the target voltage signal is smaller than the first preset duration, the second channel is conducted, the target voltage signal is output to the piezoresistor through the second output end, and when the amplitude of the target voltage signal is smaller than or equal to the first preset value and the duration of the target voltage signal is larger than the second preset duration, the first channel is conducted, and the target voltage signal is output to the signal processing circuit through the first output end;
And the piezoresistor releases the target voltage signal output by the second output end of the voltage comparator.
4. The protection device for an electronic control unit according to claim 1, wherein the signal processing circuit comprises: a voltage comparing unit and a signal processing unit;
The voltage comparing unit compares the amplitude of the target voltage signal with a second preset value and a third preset value, outputs the target voltage signal to the signal processing unit when the amplitude of the target voltage signal is greater than the second preset value or the amplitude of the target voltage signal is less than the third preset value, and outputs the target voltage signal to the voltage stabilizing circuit when the amplitude of the target voltage signal is greater than or equal to the third preset value and the amplitude of the target voltage signal is less than or equal to the second preset value;
The signal processing unit is used for carrying out attenuation processing or amplification processing on the target voltage signal, processing the target voltage signal into a voltage signal with a preset amplitude, and outputting the voltage signal with the preset amplitude to the voltage stabilizing circuit, wherein the preset amplitude is larger than the third preset value and smaller than the second preset value.
5. The protection device for an electronic control unit according to claim 4, wherein the voltage comparing unit is a voltage comparator, and the signal processing unit includes: an attenuation circuit and an amplification circuit;
The input end of the voltage comparator is connected with the output end of the voltage protection circuit, the first output end of the voltage comparator is connected with the input end of the attenuation circuit, the output end of the attenuation circuit is connected with the first input end of the voltage stabilizing circuit, the second output end of the voltage comparator is connected with the input end of the amplifying circuit, the output end of the amplifying circuit is connected with the second input end of the voltage stabilizing circuit, and the third output end of the voltage comparator is connected with the third input end of the voltage stabilizing circuit;
The voltage comparator is used for comparing the amplitude of the target voltage signal with a second preset value and a third preset value, when the amplitude of the target voltage signal is larger than the second preset value, the first channel is conducted, the target voltage signal is output to the attenuation circuit through the first output end, when the amplitude of the target voltage signal is smaller than the third preset value, the second channel is conducted, the target voltage signal is output to the amplifying circuit through the second output end, and when the amplitude of the target voltage signal is larger than or equal to the third preset value, and when the amplitude of the target voltage signal is smaller than or equal to the second preset value, the third channel is conducted, and the target voltage signal is output to the voltage stabilizing circuit through the third output end;
The attenuation circuit is used for carrying out attenuation processing on the target voltage signal with the amplitude value larger than the second preset value and outputting the voltage signal with the preset amplitude value to the voltage stabilizing circuit;
the amplifying circuit is used for amplifying the target voltage signal with the amplitude smaller than the third preset value and outputting the voltage signal with the preset amplitude to the voltage stabilizing circuit.
6. The protection device of an electronic control unit according to claim 5, wherein the attenuation circuit is further configured to perform a filtering process on the target voltage signal having a magnitude greater than the second preset value;
The amplifying circuit is further used for conducting filtering processing on the target voltage signal with the amplitude smaller than the third preset value.
7. The protection device for an electronic control unit according to any one of claims 1 to 5, wherein the voltage protection circuit, the signal processing circuit, and the voltage stabilizing circuit are packaged on a PCB board.
8. The protection device for an electronic control unit according to any one of claims 1 to 5, characterized in that the protection device for an electronic control unit further comprises: a package housing;
The voltage protection circuit, the signal processing circuit and the voltage stabilizing circuit are arranged in the packaging shell, and the packaging shell is provided with a signal trend identifier.
9. The protection device of an electronic control unit according to any one of claims 1 to 6, characterized in that a first end of the protection device of the electronic control unit is connected to the key switch in the form of a plug, and a second end of the protection device of the electronic control unit is connected to a T15 pin of the electronic control unit in the form of a plug.
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| CN201711454907.5A CN107910859B (en) | 2017-12-28 | 2017-12-28 | Protection device of electronic control unit |
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| CN201711454907.5A CN107910859B (en) | 2017-12-28 | 2017-12-28 | Protection device of electronic control unit |
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| CN107910859B true CN107910859B (en) | 2024-05-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109367442A (en) * | 2018-12-21 | 2019-02-22 | 江苏智炬汽车电子有限公司 | A kind of adjusting device of electric seat and automatic seat |
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