CN113581104A - Impedance compensation method and device for automobile grounding wire harness - Google Patents
Impedance compensation method and device for automobile grounding wire harness Download PDFInfo
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- CN113581104A CN113581104A CN202110848838.6A CN202110848838A CN113581104A CN 113581104 A CN113581104 A CN 113581104A CN 202110848838 A CN202110848838 A CN 202110848838A CN 113581104 A CN113581104 A CN 113581104A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/06—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for removing electrostatic charges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention discloses a vehicle grounding harness impedance compensation method and device. The ground harness is electrically connected between the vehicle ground plane and an output of the electronic device. The method comprises the following steps: when a control signal is provided for an electronic device, acquiring the frequency of the control signal, the wire harness parameter of a grounding wire harness, the circuit measurement impedance from the vehicle power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device; determining the wire harness theoretical impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameters; determining the value range of the wiring harness target impedance of the grounding wiring harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance; according to the frequency of the control signal, the value range of the target impedance of the wiring harness, the wiring harness parameters and the theoretical impedance of the wiring harness, the compensation capacitor and the compensation inductor of the grounding wiring harness are determined, so that the impedance compensation of the grounding wiring harness is realized, the level of the electronic device is stably output, and the electronic device is prevented from being controlled to fail due to the unstable level.
Description
Technical Field
The embodiment of the invention relates to an automobile electromagnetic interference technology, in particular to an automobile grounding harness impedance compensation method and device.
Background
In the modern times, with the development of the automobile field, the traditional automobiles gradually turn to intellectualization, networking and electrification. Automobile electronic systems are increasingly complex, and with the variety of electronic products on automobiles being rich, automobile wire harnesses are also more complex, which puts forward higher requirements for the arrangement of the automobile wire harnesses on the automobiles. The electromagnetic compatibility tests of a large amount of finished vehicles and parts can prove that the interference of the grounding harness of the vehicles and the grounding point selection of electronic devices on an electronic system of the finished vehicles is very obvious, on one hand, the arrangement of the grounding harness and the grounding point of the electronic devices can bring interference to the electronic system in the vehicles, on the other hand, the impedance of the grounding harness can affect the electronic circuit of the devices, so that the control is disabled, and the safety performance of the vehicles can be affected in severe cases.
In the prior art, the impedance of a grounding wire harness can change along with the change of the frequency of a control signal output by an electronic device, so that the output level of the electronic device is unstable, and the control failure of the electronic device is caused.
Disclosure of Invention
The invention provides an impedance compensation method and device for an automobile grounding harness, which are used for realizing impedance compensation on the grounding harness, so that the level of an electronic device is stably output, and the control failure of the electronic device caused by the unstable level of the electronic device is avoided.
In a first aspect, an embodiment of the present invention provides a vehicle ground harness impedance compensation method, where the ground harness is electrically connected between a vehicle ground plane and an output end of an electronic device, an input end of the electronic device is electrically connected to a vehicle-mounted power supply, and a control end of the electronic device receives a control signal, the method including:
when a control signal is provided for the electronic device, acquiring the frequency of the control signal, the wire harness parameter of the grounding wire harness, the circuit measurement impedance from the vehicle-mounted power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device;
determining the wire harness theoretical impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameter;
determining the value range of the wiring harness target impedance of the grounding wiring harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance;
and determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the frequency of the control signal, the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness.
Optionally, the method further includes:
when the compensation capacitor and the compensation inductor are not connected into the ground wire harness, acquiring initial measured impedance of the ground wire harness;
determining a compensation factor of the grounding wire harness according to the wire harness measuring impedance and the wire harness theoretical impedance;
determining the theoretical compensation impedance of the wiring harness of the grounding wiring harness according to the compensation factor and the value range of the target impedance of the wiring harness;
when the compensation capacitor and the compensation inductor are connected into the ground wire harness, acquiring initial compensation measurement impedance of the ground wire harness;
and determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measurement impedance and the wire harness theoretical compensation impedance.
Optionally, the method further includes:
when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the ground wire harness, acquiring the harness compensation measurement impedance of the ground wire harness;
judging whether the deviation between the wire harness compensation measurement impedance and the wire harness theoretical compensation impedance is within an impedance deviation range;
if so, sequentially connecting the compensation resistor, the compensation capacitor and the compensation inductor in series in the grounding wire harness to serve as a compensation circuit of the grounding wire harness;
if not, determining the correction resistance of the compensation resistance according to the deviation between the wire harness compensation measurement impedance and the wire harness theoretical compensation impedance;
and adding the correction resistor into the compensation resistor to obtain a corrected compensation resistor, and repeatedly executing the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness when the corrected compensation resistor is connected into the grounding wire harness as the compensation resistor.
Optionally, before repeatedly performing the step of obtaining the harness compensation measured impedance of the ground harness when the compensation resistor, the compensation capacitor, and the compensation inductor are all connected into the ground harness, the method further includes:
judging whether the number of times of the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness exceeds a preset number of times when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness at present;
if so, re-determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness;
if not, repeatedly executing the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness.
Optionally, the wire harness parameter includes a diameter D of the ground wire harness0Length L of the ground harness0And a distance D between the ground wire harness and a body of the vehicle1And the self-resistance R of the grounding wire harness0。
Optionally, determining the theoretical impedance of the ground harness according to the frequency of the control signal and the harness parameter includes:
determining the self-inductance L of the grounding wire harness according to the wire harness parametersr：
Wherein, mu0Is a vacuum magnetic conductivity;
according to the frequency of the control signal and the inductance L of the wire harnessrDetermining a theoretical wire harness impedance of the ground wire harness
Wherein f is0Is the frequency of the control signal.
Optionally, determining a value range of the target impedance of the ground wire harness according to the supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage, and the measured impedance of the circuit, includes:
according to the power supply voltage U of the vehicle-mounted power supplybatThe maximum theoretical output voltage U0And the circuit measures the impedance ZkConstructing the maximum theoretical output voltage U0With the supply voltage U of the vehicle-mounted power supplybatThe circuit measures the impedance ZkAnd the target impedance Z of the wire harnessfA first relation therebetween:
determining the target impedance Z of the wire harness according to the first relational expressionfThe value range of (a).
Optionally, determining the compensation capacitance and the compensation inductance of the ground harness according to the frequency of the control signal, the value range of the target impedance of the harness, the harness parameter, and the theoretical impedance of the harness, includes:
constructing the target impedance Z of the wire harness according to the frequency of the control signal, the wire harness parameter and the theoretical impedance of the wire harnessfAnd the capacitance value C of the compensation capacitor1Inductance value L of the compensation inductor1Frequency f of the control signal0And the self-resistance R of the grounding wire harness0A second relationship therebetween:
according to the second relation and the target impedance Z of the wire harnessfThe value ranges of (A) are respectively the capacitance value C of the compensation capacitor1And inductance value L of the compensation inductor1Assigning;
capacitance value C of the compensation capacitor1And inductance value L of the compensation inductor1Satisfies the second relation and the target impedance Z of the wire harnessfAnd determining the compensation capacitance and the compensation inductance during the value range of (2).
In a second aspect, the embodiment of the present invention further provides a vehicle ground harness impedance compensation circuit, which includes a compensation capacitor and a compensation inductor;
the ground wire harness is electrically connected between a vehicle ground plane and the output end of the electronic device, the input end of the electronic device is electrically connected with the vehicle-mounted power supply, and the control end of the electronic device receives a control signal;
the compensation capacitor and the compensation inductor are connected in series in a grounding wire bundle; the compensation capacitor and the compensation inductor are determined by the vehicle ground harness impedance compensation method according to the first aspect.
Optionally, the method further includes: a compensation resistor;
the compensation resistor, the capacitor and the compensation inductor are sequentially connected in series in a ground wire bundle; the compensation resistance is determined by the vehicle ground harness impedance compensation method according to the first aspect.
The embodiment of the invention obtains the frequency of the control signal provided to the electronic device, the wiring harness parameter of the grounding wiring harness, the circuit measuring impedance from the vehicle-mounted power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device, determining the wire harness theoretical impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameters, determining the value range of the wire harness target impedance of the grounding wire harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance, and finally determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the frequency of the control signal, the value range of the wire harness target impedance, the wire harness parameters and the wire harness theoretical impedance, therefore, the impedance compensation of the grounding wire harness is realized through the compensation capacitor and the compensation inductor, so that the level of the grounding wire harness is stably output, and the failure of electronic devices due to unstable level control is avoided. The problems that in the prior art, the intrinsic impedance of the grounding wire harness changes along with the change of the frequency of the control signal output by the electronic device, so that the output level of the electronic device is unstable, the control of the electronic device fails and the like are solved.
Drawings
FIG. 1 is a schematic flow chart of a method for compensating impedance of a vehicle ground harness according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art vehicle ground harness;
FIG. 3 is a schematic flow chart of another method for compensating impedance of a vehicle ground harness according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram illustrating another method for compensating for impedance of a vehicle ground harness in accordance with an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a vehicle ground harness impedance compensation circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another vehicle ground harness impedance compensation circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic flow chart of a vehicle ground harness impedance compensation method provided in an embodiment of the present invention, where the embodiment is applicable to a vehicle ground harness impedance compensation situation, and the method may be executed by a vehicle ground harness impedance compensation device, as shown in fig. 1, the vehicle ground harness impedance compensation method specifically includes the following steps:
and S110, when the control signal is provided for the electronic device, acquiring the frequency of the control signal, the wire harness parameter of the grounding wire harness, the circuit measurement impedance from the vehicle power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device.
Fig. 2 is a schematic structural diagram of a vehicle ground harness in the prior art, and as shown in fig. 2, the ground harness s is electrically connected between a vehicle ground plane VDD and an output terminal of an electronic device Q, an input terminal of the electronic device Q is electrically connected to a vehicle power supply VCC, and a control terminal of the electronic device Q receives a control signal. Generally, the impedance of the automobile ground harness s varies with the frequency of a control signal received by the control terminal of the electronic device Q, so that the output level of the electronic device is unstable, which may affect the electronic circuit of the electronic device itself, cause control failure, and in severe cases, may affect the safety performance of the automobile. According to the scheme, the frequency of the received control signal is obtained when the electronic device works normally, and the diameter D of the grounding wire harness is obtained0Length L of ground wire harness0Ground harness and body of vehicleA distance D between1And self-resistance R of the ground harness0Each wire harness parameter; circuit measurement impedance Z for simultaneously acquiring power supply end on vehicle and ground plane of vehiclekAnd the maximum theoretical output voltage U of the electronic device0. It will be appreciated that the maximum theoretical output voltage U of the electronic device0The method comprises the steps of ensuring that the electronic device stably outputs a voltage signal under the normal work of the electronic device; since the output of the electronic device is connected to the first end of the ground harness, the second end of the ground harness is electrically connected to the vehicle ground plane VDD, i.e. the maximum theoretical output voltage U of the electronic device0I.e. the voltage at the first end of the ground harness D.
And S120, determining the theoretical harness impedance of the grounding harness according to the frequency of the control signal and the harness parameter.
Specifically, firstly, according to the diameter D of the grounding wire harness in the wire harness parameters0Length L of ground wire harness0Distance D between ground wire harness and vehicle body of vehicle1Determining the self inductance L of the ground harnessr：
Wherein, mu0Is a vacuum magnetic conductivity;
then according to the frequency f of the control signal0And the self inductance L of the wire harnessrDetermining the theoretical impedance of the ground beam
And S130, determining the value range of the target impedance of the wiring harness of the grounding wiring harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance.
Wherein, in order to ensure the normal operation of the electronic device, the electronic device is controlledEffectively, since the output end of the electronic device is electrically connected with the first end of the grounding wire harness, the maximum theoretical output voltage U of the electronic device needs to be ensured0And namely ensuring that the voltage of the first end of the grounding wire harness meets the following conditions:
specifically, the target harness impedance Z of the ground harnessfThe value range is determined according to the supply voltage U of the vehicle-mounted power supplybatMaximum theoretical output voltage U0And the circuit measures the impedance ZkBuilding the maximum theoretical output voltage U0Supply voltage U with vehicle power supplybatCircuit measuring impedance ZkAnd a target impedance Z of the wire harnessfFirst relation between them, then at a given maximum theoretical output voltage U0According to the first relation, the target impedance Z of the wire harness can be theoretically determinedfThe value range of (a).
And S140, determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the frequency of the control signal, the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness.
Wherein first of all according to the frequency f of the control signal0Self-resistance R of grounding wire harness in wire harness parameters0And the theoretical impedance Z of the beamrConstructing a target impedance Z of the beamfAnd the capacitance value C of the compensation capacitor1Inductance L of the compensation inductor1Frequency f of the control signal0And self-resistance R of the ground harness0A second relationship therebetween:
then according to the second relation and the target impedance Z of the beamfThe value ranges of (A) are respectively the capacitance value C of the compensation capacitor1And inductance L of the compensation inductor1Assigning; then the capacitance value C of the compensation capacitor1And an inductance of the compensation inductanceValue L1Satisfies the second relation and the target impedance Z of the beamfAnd determining the compensation capacitance and the compensation inductance during the value range of (2). Therefore, the impedance compensation of the grounding wire harness is realized by adding the compensation capacitor and the compensation inductor on the grounding wire harness, so that the output voltage of the electronic device is stable, and the electronic device is prevented from being controlled to fail due to the unstable level. The problems that in the prior art, the intrinsic impedance of a grounding wire harness changes along with the change of the frequency of the control signal output by an electronic device, so that the output level of the electronic device is unstable, the control of the electronic device fails and the like are solved.
Optionally, on the basis of the foregoing embodiment, impedance compensation is further optimized, and fig. 3 is a schematic flow chart of another vehicle ground harness impedance compensation method provided in the embodiment of the present invention, as shown in fig. 3, the vehicle ground harness impedance compensation method includes the following steps:
s210, when the control signal is provided for the electronic device, the frequency of the control signal, the wire harness parameter of the grounding wire harness, the circuit measurement impedance from the vehicle power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device are obtained.
And S220, determining the theoretical harness impedance of the grounding harness according to the frequency of the control signal and the harness parameter.
And S230, determining the value range of the target impedance of the wiring harness of the grounding wiring harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance.
S240, determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the frequency of the control signal, the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness.
And S250, when the compensation capacitor and the compensation inductor are not connected into the ground wire harness, acquiring the initial measured impedance of the ground wire harness.
And S260, determining a compensation factor of the grounding wire harness according to the initial measured impedance of the wire harness and the theoretical impedance of the wire harness.
Wherein the initial measured impedance Z of the ground harness is measured and obtained by a network analyzer0(ii) a Since the network analyzer measuresThe existence of objective factors such as test conditions and the like can cause the initial measured impedance Z of the wiring harness0And the theoretical impedance Z of the beamrThere is a certain deviation, so that the impedance Z is initially measured from the wire harness0And the theoretical impedance Z of the beamrThe ratio of (a) to (b) is required to introduce a compensation factor for the ground beam, namely:
and S270, determining the theoretical compensation impedance of the wiring harness of the grounding wiring harness according to the compensation factor and the value range of the target impedance of the wiring harness.
Wherein the impedance is compensated for accurately characterizing the theoretical wiring harness compensation impedance of the ground wiring harness
Taking the compensation factor into account, according to the compensation factor eta and the target impedance Z of the beamfDetermining the theoretical compensation impedance of the wire harness; namely:
and S280, when the compensation capacitor and the compensation inductor are connected into the grounding wire harness, acquiring initial compensation measurement impedance of the grounding wire harness.
The initial compensation measurement impedance Z 'of the grounding wire harness can be accurately and quickly measured and obtained through measurement of the network analyzer'f *。
And S290, determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measurement impedance and the theoretical compensation impedance of the wire harness.
Wherein the impedance Z 'is measured from the initial compensation'f *Compensating impedance with wire harness theory
The difference between them yields the compensation resistance Rc of the ground beam, i.e.:
thus, on the basis of the above embodiment, on the basis of adding the compensation capacitor and the compensation inductor to the ground wiring harness, the compensation resistor is added, and further impedance compensation to the ground wiring harness is realized through the compensation capacitor, the compensation inductor and the compensation resistor, so that the actual level of the first end of the ground wiring harness is further close to the maximum output voltage U0And the output voltage of the electronic device is more stable, and the electronic device is prevented from being controlled to lose effectiveness due to the unstable level.
Optionally, on the basis of the foregoing embodiment, the compensation resistance is further optimized, fig. 4 is a schematic flow chart of another vehicle ground harness impedance compensation method provided in the embodiment of the present invention, and as shown in fig. 4, the vehicle ground harness impedance compensation method includes the following steps:
s310, when the control signal is provided for the electronic device, the frequency of the control signal, the wire harness parameter of the grounding wire harness, the circuit measurement impedance from the vehicle power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device are obtained.
And S320, determining the theoretical harness impedance of the grounding harness according to the frequency of the control signal and the harness parameter.
S330, determining the value range of the target impedance of the wiring harness of the grounding wiring harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance.
And S340, determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the frequency of the control signal, the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness.
And S350, when the compensation capacitor and the compensation inductor are not connected into the ground wire harness, acquiring the initial measured impedance of the ground wire harness.
And S360, determining a compensation factor of the grounding wire harness according to the initial measured impedance of the wire harness and the theoretical impedance of the wire harness.
And S370, determining the theoretical compensation impedance of the wiring harness of the grounding wiring harness according to the compensation factor and the value range of the target impedance of the wiring harness.
And S380, when the compensation capacitor and the compensation inductor are connected into the ground wire harness, obtaining the initial compensation measurement impedance of the ground wire harness.
And S390, determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measurement impedance and the wire harness theoretical compensation impedance.
S400, when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness, the wire harness compensation measurement impedance of the grounding wire harness is obtained.
Likewise, the wiring harness compensation measurement impedance Z' of the grounding wiring harness is measured and obtained by the network analyzerf *。
And S410, judging whether the deviation between the wire harness compensation measurement impedance and the wire harness theoretical compensation impedance is in an impedance deviation range.
S420, if yes, sequentially connecting a compensation resistor, a compensation capacitor and a compensation inductor in series in the grounding wire harness to serve as a compensation circuit of the grounding wire harness; otherwise, S430 is performed.
Wherein, when the wiring harness compensates and measures the impedance Z ″)f *Compensating impedance with wire harness theory
Within a predetermined deviation range, for example, when the wiring harness compensates for the measured impedance Z ″ "f *Compensating impedance with wire harness theory
Satisfies the following conditions:
the wiring harness compensates for the measured impedance Z ″f *Compensating impedance with wire harness theory
When the voltage values are approximately the same, the compensation resistor, the compensation capacitor and the compensation inductor are connected in series in the grounding wire bundle in sequence to be used as the grounding wire bundleA compensation circuit for setting the actual level and the maximum output voltage U of the first end of the ground wire harness with the compensation circuit0The voltage tends to be the same, the output voltage of the electronic device is stable, the electronic device is not influenced, and the accurate compensation of the compensation circuit is realized.
S430, determining a correction resistance of the compensation resistance according to the deviation between the wire harness compensation measurement impedance and the wire harness theoretical compensation impedance; adding the correction resistor into the compensation resistor to obtain a corrected compensation resistor, and repeating S400 when the corrected compensation resistor is connected into the ground wire bundle as the compensation resistor.
Wherein, when the wiring harness compensates and measures the impedance Z ″)f *Compensating impedance with wire harness theory
If the deviation is larger than the preset deviation range, correcting the compensation resistor; connecting the corrected compensation resistor into the grounding wire harness, and measuring the wire harness compensation measurement impedance Z 'of the grounding wire harness again'f *(ii) a Until the wire harness compensation measures impedance Z'f *Compensating impedance with wire harness theory
When the deviation is within the preset deviation range, the compensation resistor, the compensation capacitor and the compensation inductor are sequentially connected in series in the grounding wire harness to serve as a compensation circuit of the final grounding wire harness, and the compensation resistor is circularly corrected in such a way, so that the wire harness compensates and measures the impedance Z ″', whereinf *Compensating impedance with wire harness theory
The same trend is achieved, and accurate compensation of the compensation circuit is achieved.
Optionally, before repeatedly performing step S400, the method further includes:
judging whether the number of times of the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness exceeds the preset number of times when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness at present and repeatedly executed;
if so, re-determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness;
if not, repeatedly executing the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness.
Wherein, in the process of correcting the compensation resistor, if the times of correcting the compensation resistor reaches the preset times, the wiring harness compensates the measured impedance Z ″f *Compensating impedance with wire harness theory
If the deviation is still larger than the preset deviation range, the compensation capacitor and the compensation capacitor are determined again, so that repeated correction of the compensation resistor is avoided, and the impedance compensation efficiency of the grounding wire harness is improved.
The embodiment of the invention also provides a vehicle grounding wire harness impedance compensation circuit; the vehicle grounding harness impedance compensation circuit is used for carrying out impedance compensation on a vehicle grounding harness. FIG. 5 is a schematic structural diagram of a vehicle ground harness impedance compensation circuit according to an embodiment of the present invention; as shown in fig. 5, the vehicle ground harness impedance compensation circuit includes a compensation capacitor C and a compensation inductor L; the ground wire harness is electrically connected between a vehicle ground plane VDD and an output end of an electronic device Q, an input end of the electronic device Q is electrically connected with a vehicle-mounted power supply Ubat, and a control end of the electronic device Q receives a control signal; the compensation capacitor C and the compensation inductor L are connected in series in the ground wire bundle; the compensation capacitor C and the compensation inductor L are determined by using the vehicle ground harness impedance compensation method provided in the above embodiment, and details are not repeated here. The beneficial effect of the device is the same as that of the vehicle grounding wire harness impedance compensation method, and the description is omitted here.
Alternatively, fig. 6 is a schematic structural diagram of another vehicle ground harness impedance compensation circuit provided in the embodiment of the present invention; as shown in fig. 6, the vehicle ground harness impedance compensation circuit further includes: a compensation resistor R; the compensation resistor R, the compensation capacitor C and the compensation inductor L are sequentially connected in series in the ground wire bundle; the compensation resistor R is determined by the compensation method of the compensation resistor provided in the above embodiment, and details are not described here. The beneficial effect of the device is the same as that of the vehicle grounding wire harness impedance compensation method, and the description is omitted here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A vehicle grounding harness impedance compensation method is characterized in that a grounding harness is electrically connected between a vehicle grounding plane and an output end of an electronic device, an input end of the electronic device is electrically connected with a vehicle-mounted power supply, and a control end of the electronic device receives a control signal, and the method comprises the following steps:
when a control signal is provided for the electronic device, acquiring the frequency of the control signal, the wire harness parameter of the grounding wire harness, the circuit measurement impedance from the vehicle-mounted power supply end to the vehicle grounding plane and the maximum theoretical output voltage of the electronic device;
determining the wire harness theoretical impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameter;
determining the value range of the wiring harness target impedance of the grounding wiring harness according to the power supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance;
and determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the frequency of the control signal, the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness.
2. The vehicle ground harness impedance compensation method of claim 1, further comprising:
when the compensation capacitor and the compensation inductor are not connected into the ground wire harness, acquiring initial measured impedance of the ground wire harness;
determining a compensation factor of the grounding wire harness according to the wire harness measuring impedance and the wire harness theoretical impedance;
determining the theoretical compensation impedance of the wiring harness of the grounding wiring harness according to the compensation factor and the value range of the target impedance of the wiring harness;
when the compensation capacitor and the compensation inductor are connected into the ground wire harness, acquiring initial compensation measurement impedance of the ground wire harness;
and determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measurement impedance and the wire harness theoretical compensation impedance.
3. The vehicle ground harness impedance compensation method of claim 2, further comprising:
when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the ground wire harness, acquiring the harness compensation measurement impedance of the ground wire harness;
judging whether the deviation between the wire harness compensation measurement impedance and the wire harness theoretical compensation impedance is within an impedance deviation range;
if so, sequentially connecting the compensation resistor, the compensation capacitor and the compensation inductor in series in the grounding wire harness to serve as a compensation circuit of the grounding wire harness;
if not, determining the correction resistance of the compensation resistance according to the deviation between the wire harness compensation measurement impedance and the wire harness theoretical compensation impedance;
and adding the correction resistor into the compensation resistor to obtain a corrected compensation resistor, and repeatedly executing the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness when the corrected compensation resistor is connected into the grounding wire harness as the compensation resistor.
4. The vehicle ground harness impedance compensation method according to claim 3, further comprising, before repeatedly performing the step of obtaining the harness compensation measured impedance of the ground harness when the compensation resistance, the compensation capacitance, and the compensation inductance are all connected into the ground harness:
judging whether the number of times of the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness exceeds a preset number of times when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness at present;
if so, re-determining the compensation capacitance and the compensation inductance of the grounding wire harness according to the value range of the target impedance of the wire harness, the wire harness parameters and the theoretical impedance of the wire harness;
if not, repeatedly executing the step of obtaining the wire harness compensation measurement impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected into the grounding wire harness.
5. The vehicle ground harness impedance compensation method of claim 1, wherein the harness parameter comprises a diameter D of the ground harness0Length L of the ground harness0And a distance D between the ground wire harness and a body of the vehicle1And the self-resistance R of the grounding wire harness0。
6. The vehicle ground harness impedance compensation method of claim 5, wherein determining the harness theoretical impedance of the ground harness based on the frequency of the control signal and the harness parameter comprises:
determining the grounding wire harness according to the wire harness parametersSelf inductance L of wire harnessr：
Wherein, mu0Is a vacuum magnetic conductivity;
according to the frequency of the control signal and the inductance L of the wire harnessrDetermining a theoretical wire harness impedance of the ground wire harness
Wherein f is0Is the frequency of the control signal.
7. The vehicle ground harness impedance compensation method according to claim 5, wherein determining a value range of a harness target impedance of the ground harness according to a supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage, and the circuit measurement impedance comprises:
according to the power supply voltage U of the vehicle-mounted power supplybatThe maximum theoretical output voltage U0And the circuit measures the impedance ZkConstructing the maximum theoretical output voltage U0With the supply voltage U of the vehicle-mounted power supplybatThe circuit measures the impedance ZkAnd the target impedance Z of the wire harnessfA first relation therebetween:
determining the target impedance Z of the wire harness according to the first relational expressionfThe value range of (a).
8. The vehicle ground harness impedance compensation method of claim 7, wherein determining the compensation capacitance and the compensation inductance of the ground harness according to the frequency of the control signal, the range of the target impedance of the harness, the harness parameter, and the theoretical impedance of the harness comprises:
constructing the target impedance Z of the wire harness according to the frequency of the control signal, the wire harness parameter and the theoretical impedance of the wire harnessfAnd the capacitance value C of the compensation capacitor1Inductance value L of the compensation inductor1Frequency f of the control signal0And the self-resistance R of the grounding wire harness0A second relationship therebetween:
according to the second relation and the target impedance Z of the wire harnessfThe value ranges of (A) are respectively the capacitance value C of the compensation capacitor1And inductance value L of the compensation inductor1Assigning;
capacitance value C of the compensation capacitor1And inductance value L of the compensation inductor1Satisfies the second relation and the target impedance Z of the wire harnessfAnd determining the compensation capacitance and the compensation inductance during the value range of (2).
9. A vehicle ground harness impedance compensation circuit, comprising: a compensation capacitor and a compensation inductor;
the ground wire harness is electrically connected between a vehicle ground plane and the output end of the electronic device, the input end of the electronic device is electrically connected with the vehicle-mounted power supply, and the control end of the electronic device receives a control signal;
the compensation capacitor and the compensation inductor are connected in series in a grounding wire bundle; the compensation capacitance and the compensation inductance are determined using the vehicle ground harness impedance compensation method of any one of claims 1-8.
10. The vehicle ground harness impedance compensation circuit of claim 9, further comprising: a compensation resistor;
the compensation resistor, the capacitor and the compensation inductor are sequentially connected in series in a ground wire bundle; the compensation resistance is determined by the vehicle ground harness impedance compensation method of any one of claims 2-4.
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| US5444381A (en) * | 1989-08-23 | 1995-08-22 | Robert Bosch Gmbh | Measuring circuit for impedance values particularly for use with inductive displacement transmitters |
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| CN110568264A (en) * | 2019-09-24 | 2019-12-13 | 潍柴动力股份有限公司 | Wire harness detection device and method |
| CN111953026A (en) * | 2020-07-12 | 2020-11-17 | 国网江苏省电力有限公司南京供电分公司 | Virtual synchronous generator control method and system based on second-order response voltage compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5444381A (en) * | 1989-08-23 | 1995-08-22 | Robert Bosch Gmbh | Measuring circuit for impedance values particularly for use with inductive displacement transmitters |
| CN109061372A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source output voltage calculation method that ground fault compensates entirely |
| CN110568264A (en) * | 2019-09-24 | 2019-12-13 | 潍柴动力股份有限公司 | Wire harness detection device and method |
| CN111953026A (en) * | 2020-07-12 | 2020-11-17 | 国网江苏省电力有限公司南京供电分公司 | Virtual synchronous generator control method and system based on second-order response voltage compensation |
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