CN113581104B - 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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- CN113581104B CN113581104B CN202110848838.6A CN202110848838A CN113581104B CN 113581104 B CN113581104 B CN 113581104B CN 202110848838 A CN202110848838 A CN 202110848838A CN 113581104 B CN113581104 B CN 113581104B
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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 wire 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 parameters of a grounding wire harness, the circuit measurement impedance from the vehicle-mounted power supply end to the vehicle ground plane and the maximum theoretical output voltage of the electronic device; determining the theoretical wire harness impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameters; determining a value range of a 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; 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 capacitance and the compensation inductance 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 losing efficacy due to unstable control of the level.
Description
Technical Field
The embodiment of the invention relates to an automobile electromagnetic interference technology, in particular to an automobile grounding wire harness impedance compensation method and device.
Background
In the current age, along with the development of the automobile field, the traditional automobile is gradually transformed into an intelligent, networking and electrified direction. Automobile electronic systems are increasingly complex, and as the variety of electronic products on automobiles is continuously enriched, automobile wiring harnesses are also more complex, which puts higher demands on the arrangement of the automobile wiring harnesses on vehicles. The electromagnetic compatibility test of a large number of whole vehicles and parts can prove that the grounding wire harness of the vehicle and the grounding point of the electronic device have obvious interference on the whole vehicle electronic system, on one hand, the arrangement of the grounding wire harness of the electronic device and the grounding point can bring interference to the electronic system in the vehicle, on the other hand, the impedance of the grounding wire harness can influence the electronic circuit of the device, so that the control is invalid, and the safety performance of the vehicle can be influenced when serious.
In the prior art, the impedance of the grounding wire harness can change along with the change of the frequency of an output control signal of the electronic device, so that the output level of the electronic device is unstable, and the control of the electronic device is invalid.
Disclosure of Invention
The invention provides an impedance compensation method and device for an automobile grounding wire bundle, which are used for realizing impedance compensation for the grounding wire bundle, 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 method for compensating impedance of a ground wire harness of a vehicle, where the ground wire harness is electrically connected between a ground plane of the vehicle 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, where the method is characterized by 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 ground plane and the maximum theoretical output voltage of the electronic device;
determining the theoretical wire harness impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameters;
determining a value range of a 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 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 wire harness impedance, the wire harness parameters and the theoretical wire harness impedance.
Optionally, the method further comprises:
when the compensation capacitor and the compensation inductor are not connected into the grounding wire harness, acquiring initial measured impedance of the grounding wire harness;
determining a compensation factor of the grounding wire harness according to the wire harness measurement impedance and the wire harness theoretical impedance;
determining the theoretical compensation impedance of the wire harness of the grounding wire harness according to the compensation factors and the value range of the target impedance of the wire harness;
when the compensation capacitor and the compensation inductor are connected into the grounding wire harness, initial compensation measurement impedance of the grounding wire harness is obtained;
and determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measured impedance and the wire harness theoretical compensation impedance.
Optionally, the method further comprises:
when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness, the wire harness compensation measured impedance of the grounding wire harness is obtained;
judging whether the deviation between the wire harness compensation measured impedance and the wire harness theoretical compensation impedance is within an impedance deviation range or not;
if yes, 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 grounding wire harness;
if not, determining the correction resistance of the compensation resistance according to the deviation between the wire harness compensation measured impedance and the wire harness theoretical compensation impedance;
and adding the correction resistor to the compensation resistor to obtain a corrected compensation resistor, and repeatedly executing the steps of obtaining the wire harness compensation measured impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected to the grounding wire harness when the corrected compensation resistor is connected to the grounding wire harness as the compensation resistor.
Optionally, before repeatedly performing the step of obtaining the compensating measured impedance of the grounding wire harness when the compensating resistor, the compensating capacitor and the compensating inductance are all connected into the grounding wire harness, the method further includes:
judging whether the number of times of acquiring the wire harness compensation measurement impedance of the grounding wire harness exceeds a preset number of times or not when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness in the current repeated execution;
if yes, the compensation capacitance and the compensation inductance of the grounding wire harness are determined again according to the value range of the wire harness target impedance, the wire harness parameters and the wire harness theoretical impedance;
if not, repeating the step of acquiring the wire harness compensation measured impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness.
Optionally, the harness parameter includes a diameter D of the ground harness 0 Length L of the grounding wire harness 0 Distance D between the ground wire harness and the body of the vehicle 1 Self-resistance R of the grounding harness 0 。
Optionally, determining the theoretical impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameter includes:
according to the wire harness parameters, determining the wire harness self inductance L of the grounding wire harness r ：
Wherein mu 0 Is vacuum magnetic permeability;
according to the frequency of the control signal and the self inductance L of the wire harness r Determining the groundWire harness theoretical impedance of wire harness
Wherein f 0 Is the frequency of the control signal.
Optionally, determining the range of the value of the target impedance of the grounding wire harness according to the supply voltage of the vehicle-mounted power supply, the maximum theoretical output voltage and the circuit measurement impedance includes:
according to the power supply voltage U of the vehicle-mounted power supply bat Said maximum theoretical output voltage U 0 The circuit measures impedance Z k Constructing the maximum theoretical output voltage U 0 Supply voltage U with the vehicle-mounted power supply bat The circuit measures impedance Z k The harness target impedance Z f A first relation between:
determining the harness target impedance Z according to the first relation f Is a range of values.
Optionally, determining the compensation capacitance and the compensation inductance of the grounding 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 parameters and the theoretical impedance of the wire harness f Capacitance C with the compensation capacitor 1 Inductance value L of the compensation inductance 1 Frequency f of the control signal 0 Self-resistance R of the grounding harness 0 A second relation between:
according to the second relation and the harness target impedance Z f The value ranges of the compensation capacitors are respectively the capacitance value C of the compensation capacitors 1 And the inductance value L of the compensating inductance 1 Assigning a value;
capacitance C of the compensation capacitor 1 And the inductance value L of the compensating inductance 1 Satisfies the second relation and the harness target impedance Z f And determining the compensation capacitance and the compensation inductance.
In a second aspect, the embodiment of the invention further provides a vehicle grounding wire harness impedance compensation circuit, which comprises a compensation capacitor and a compensation inductor;
the grounding wire harness is electrically connected between the vehicle grounding 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 the grounding wire harness; the compensation capacitor and the compensation inductance are determined by the vehicle grounding wire harness impedance compensation method according to the first aspect.
Optionally, the method further comprises: a compensation resistor;
the compensation resistor, the capacitor and the compensation inductor are sequentially connected in series in a grounding wire harness; the compensation resistor is determined by the vehicle grounding wire harness impedance compensation method according to the first aspect.
According to the embodiment of the invention, the frequency of a control signal provided for an electronic device, the wire harness parameter of a grounding wire harness, the circuit measurement impedance from a vehicle power supply end to a vehicle ground plane and the maximum theoretical output voltage of the electronic device are obtained, the wire harness theoretical impedance of the grounding wire harness is determined according to the frequency of the control signal and the wire harness parameter, the value range of the wire harness target impedance of the grounding wire harness is determined according to the power supply voltage of the vehicle power supply, the maximum theoretical output voltage and the circuit measurement impedance, and finally the compensation capacitance and the compensation inductance of the grounding wire harness are determined according to the frequency of the control signal, the value range of the wire harness target impedance, the wire harness parameter and the wire harness theoretical impedance, so that the impedance compensation of the grounding wire harness is realized through the compensation capacitance and the compensation inductance, the level of the grounding wire harness is stably output, and the electronic device is prevented from losing control due to the level instability. The problems that the intrinsic impedance of the grounding wire harness in the prior art can change 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 is invalid and the like are solved.
Drawings
Fig. 1 is a schematic flow chart of a method for compensating impedance of a grounding wire harness of a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic view of a prior art vehicle ground harness;
FIG. 3 is a schematic flow chart of another method for compensating impedance of a grounding wire harness of a vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of another method for compensating impedance of a grounding wire harness of a vehicle according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle grounding wire harness impedance compensation circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another impedance compensation circuit for a grounding wire harness of a vehicle according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a flow chart of a vehicle grounding wire harness impedance compensation method according to an embodiment of the present invention, where the method may be executed by a vehicle grounding wire harness impedance compensation device, and as shown in fig. 1, the vehicle grounding wire harness impedance compensation method specifically includes the following steps:
s110, when a control signal is provided for the electronic device, the frequency of the control signal, the wire harness parameters of the grounding wire harness, the circuit measurement impedance from the vehicle power supply end to the vehicle ground plane and the maximum theoretical output voltage of the electronic device are obtained.
Fig. 2 is a schematic structural diagram of a vehicle grounding harness in the prior art, as shown in fig. 2, a grounding harness s 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 VCC, and a control end of the electronic device Q receives a control signal. In general, the impedance of the grounding wire bundle s of the automobile will change along with the change of the frequency of the control signal received by the control end of the electronic device Q, so that the output level of the electronic device is unstable, which will affect the electronic circuit of the electronic device itself, so that the control will fail, and the safety performance of the automobile will be affected when serious. According to the scheme, when the electronic device works normally, the frequency of the received control signal is obtained, and the diameter D of the grounding wire harness is obtained 0 Length L of ground harness 0 Distance D between the ground wire harness and the body of the vehicle 1 Self-resistance R of grounding harness 0 Parameters of each wire harness; simultaneously acquiring circuit measurement impedance Z from vehicle power supply end to vehicle ground plane k Maximum theoretical output voltage U of electronic device 0 . It will be appreciated that the maximum theoretical output voltage U of the electronic device 0 The method refers to the stable output voltage signal of the electronic device under the condition that the electronic device is ensured to work normally; since the output terminal of the electronic device is connected to the first terminal of the ground harness, the second terminal of the ground harness is electrically connected to the vehicle ground plane VDD, i.e. the maximum theoretical output voltage U of the electronic device 0 I.e., the voltage at the first end of the ground harness D.
S120, determining the theoretical impedance of the wire harness of the grounding wire harness according to the frequency of the control signal and the wire harness parameters.
Specifically, the diameter D of the grounding wire harness is firstly determined according to the wire harness parameters 0 Length L of ground harness 0 Distance between the ground wire harness and the body of the vehicleD 1 Wire harness self-inductance L for determining grounding wire harness r ：
Wherein mu 0 Is vacuum magnetic permeability;
then according to the frequency f of the control signal 0 And wire harness self inductance L r Determining a theoretical impedance of a wire harness of a ground wire harness
S130, determining a 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.
Wherein, in order to ensure the normal operation of the electronic device, the electronic device is controlled effectively, and the output end of the electronic device is electrically connected with the first end of the grounding wire harness, so that the maximum theoretical output voltage U of the electronic device is required to be ensured 0 That is, the voltage at the first end of the grounding wire harness is ensured to satisfy:
specifically, the harness target impedance Z of the ground harness f The value range of the power supply is determined according to the power supply voltage U of the vehicle-mounted power supply bat Maximum theoretical output voltage U 0 Circuit measuring impedance Z k Constructing a maximum theoretical output voltage U 0 Supply voltage U with vehicle power supply bat Circuit measuring impedance Z k Wire harness target impedance Z f A first relation between them, then at a given maximum theoretical output voltage U 0 According to the first relation, the wire harness order can be theoretically determinedTarget impedance Z f Is a range of values.
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, firstly, according to the frequency f of the control signal 0 Self-resistance R of grounding wire harness in wire harness parameters 0 And theoretical impedance Z of wire harness r Constructing a harness target impedance Z f Capacitance C of compensation capacitor 1 Inductance value L of compensation inductance 1 Frequency f of control signal 0 Self-resistance R of grounding harness 0 A second relation between:
and then according to the second relation and the target impedance Z of the wiring harness f The value ranges of (a) are respectively the capacitance value C of the compensation capacitor 1 And compensating inductance L of the inductance 1 Assigning a value; then at the capacitance C of the compensation capacitor 1 And compensating inductance L of the inductance 1 Satisfy a second relation and a harness target impedance Z f And determining the compensation capacitance and the compensation inductance when the value range is taken. 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 losing efficacy due to unstable control of the level. The problems that the intrinsic impedance of the grounding wire harness in the prior art can change 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 is invalid and the like are solved.
Optionally, based on the foregoing embodiment, the impedance compensation is further optimized, and fig. 3 is a schematic flow chart of another vehicle grounding wire harness impedance compensation method according to an embodiment of the present invention, as shown in fig. 3, where the vehicle grounding wire harness impedance compensation method includes the following steps:
s210, when a control signal is provided for the electronic device, the frequency of the control signal, the wire harness parameters of the grounding wire harness, the circuit measurement impedance from the vehicle power supply end to the vehicle ground plane and the maximum theoretical output voltage of the electronic device are obtained.
S220, determining the theoretical impedance of the wire harness of the grounding wire harness according to the frequency of the control signal and the wire harness parameters.
S230, determining a 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.
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.
S250, when the compensation capacitor and the compensation inductor are not connected into the grounding wire harness, acquiring initial measured impedance of the grounding 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 wire harness of the grounding wire harness is measured and obtained through a network analyzer 0 The method comprises the steps of carrying out a first treatment on the surface of the The initial measured impedance Z of the wire harness can be caused by the existence of objective factors such as the testing condition of the network analyzer 0 And theoretical impedance Z of wire harness r There is a certain deviation, so the impedance Z is initially measured according to the wire harness 0 And theoretical impedance Z of wire harness r The compensation factor of the ground wire bundle is introduced, namely:
s270, determining the theoretical compensation impedance of the wire harness of the grounding wire harness according to the compensation factors and the value range of the target impedance of the wire harness.
Wherein, the theoretical compensation impedance of the wire harness for accurately representing the grounding wire harnessTaking the compensation factor into consideration, according to the compensation factor eta and the harness target impedance Z f Is taken from (a)Determining theoretical compensation impedance of the wire harness in a value range; namely:
s280, when the compensation capacitor and the compensation inductor are connected into the grounding wire harness, initial compensation measurement impedance of the grounding wire harness is obtained.
Wherein, the initial compensation measured impedance Z 'of the grounding wire harness can be accurately and rapidly measured and obtained through the measurement of the network analyzer' f * 。
S290, determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measured impedance and the theoretical compensation impedance of the wire harness.
Wherein the impedance Z 'is measured according to the initial compensation' f * Theoretical compensation impedance with wire harnessThe difference between them results in a compensating resistance Rc of the ground harness, namely:
thus, on the basis of the embodiment, on the basis of adding the compensation capacitor and the compensation inductor to the grounding wire harness, the compensation resistor is added, and the further impedance compensation of the grounding wire 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 grounding wire harness is further close to the maximum output voltage U 0 The output voltage of the electronic device is more stable, and the electronic device is prevented from being invalid due to unstable control of the level.
Optionally, on the basis of the foregoing embodiment, the compensation resistor is further optimized, and fig. 4 is a schematic flow chart of another vehicle grounding wire harness impedance compensation method according to the embodiment of the present invention, as shown in fig. 4, where the vehicle grounding wire harness impedance compensation method includes the following steps:
and S310, when a control signal is provided for the electronic device, acquiring the frequency of the control signal, the wire harness parameters of the grounding wire harness, the circuit measurement impedance from the vehicle-mounted power supply end to the ground plane of the vehicle and the maximum theoretical output voltage of the electronic device.
S320, determining the theoretical impedance of the wire harness of the grounding wire harness according to the frequency of the control signal and the wire harness parameters.
S330, determining a 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.
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, acquiring initial measured impedance of the wire harness of the grounding wire harness when the compensation capacitor and the compensation inductor are not connected into the grounding wire harness.
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 wire harness of the grounding wire harness according to the compensation factors and the value range of the target impedance of the wire harness.
And S380, 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.
S390, 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.
And S400, when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness, the wire harness compensation measured impedance of the grounding wire harness is obtained.
Likewise, the harness compensation measured impedance z″ of the ground harness is measured and obtained by the network analyzer f * 。
S410, judging whether the deviation between the wire harness compensation measured impedance and the wire harness theoretical compensation impedance is within an impedance deviation range.
S420, if so, 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 the impedance Z' is measured when the harness is compensated f * Theoretical compensation impedance with wire harnessWithin a preset deviation range, for example, when the harness compensates for the measured impedance Z' f * Theoretical compensation impedance with wire harness>The method meets the following conditions:
the harness compensates for the measured impedance Z f * Theoretical compensation impedance with wire harnessIf the voltage is about to be the same, the compensation resistor, the compensation capacitor and the compensation inductor are sequentially connected in series in the grounding wire harness to be used as a compensation circuit of the grounding wire harness, so that the actual level of the first end of the grounding wire harness with the compensation circuit is built and the maximum output voltage U 0 The voltage of 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 resistor according to deviation between the wire harness compensation measured impedance and the wire harness theoretical compensation impedance; and adding the corrected resistance to the compensation resistance to obtain the corrected compensation resistance, and repeating the step S400 when the corrected compensation resistance is used as the compensation resistance to be connected into the grounding wire harness.
Wherein the impedance Z' is measured when the harness is compensated f * Theoretical compensation impedance with wire harnessIf the deviation of the voltage is larger than the preset deviation range, correcting the compensation resistor; the corrected compensation resistor is connected into a grounding wire harness, andharness compensation measurement impedance Z 'of the ground harness is measured again' f * The method comprises the steps of carrying out a first treatment on the surface of the Until the harness compensates for the measured impedance Z '' f * Theoretical compensation impedance with wire harness>When the deviation of the voltage 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 be used as a compensation circuit of the final grounding wire harness, and the compensation resistor is circularly corrected in such a way that the wire harness compensates the measured impedance Z' f * Theoretical compensation impedance with wire harness>Tend to be identical, realizing accurate compensation of the compensation circuit.
Optionally, before repeatedly executing step S400, the method further includes:
judging whether the number of times of acquiring 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 connected into the grounding wire harness in the current repeated execution;
if yes, the compensation capacitance and the compensation inductance of the grounding wire harness are redetermined according to the value range of the target wire harness impedance, the wire harness parameters and the theoretical wire harness impedance;
if not, repeating 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 connected into the grounding wire harness.
Wherein, in the process of correcting the compensation resistor, if the number of times of correcting the compensation resistor reaches the preset number of times, the harness compensation measures the impedance Z' f * Theoretical compensation impedance with wire harnessIf the deviation of the voltage is still larger than the preset deviation range, the compensation capacitor and the compensation capacitor are determined again, the compensation resistor is prevented from being corrected repeatedly, and the impedance compensation efficiency of the grounding wire bundle is improved.
The embodiment of the invention also provides a vehicle grounding wire harness impedance compensation circuit; the vehicle grounding wire harness impedance compensation circuit is used for carrying out impedance compensation on the vehicle grounding wire harness. Fig. 5 is a schematic structural diagram of a vehicle grounding wire harness impedance compensation circuit according to an embodiment of the present invention; as shown in fig. 5, the vehicle grounding wire harness impedance compensation circuit includes a compensation capacitor C and a compensation inductance L; the grounding wire harness is electrically connected between a vehicle grounding plane VDD and an output end of the electronic device Q, an input end of the electronic device Q is electrically connected with the 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 grounding wire harness; the compensation capacitor C and the compensation inductance L are determined by using the vehicle grounding wire harness impedance compensation method provided in the above embodiment, and will not be described herein. The beneficial effects of the device are the same as those of the vehicle grounding wire harness impedance compensation method, and the description is omitted here.
Optionally, fig. 6 is a schematic structural diagram of another impedance compensation circuit for a grounding wire harness of a vehicle according to an 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 grounding wire harness; the compensation resistor R is determined by using the compensation method of the compensation resistor provided in the above embodiment, and will not be described herein. The beneficial effects of the device are the same as those of the vehicle grounding wire harness impedance compensation method, and the description is omitted here.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (6)
1. The method for compensating the impedance of the grounding wire harness of the vehicle is characterized in that the grounding wire harness is electrically connected between the grounding plane of the vehicle and the output end of an electronic device, the input end of the electronic device is electrically connected with a vehicle-mounted power supply, and the 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 ground plane and the maximum theoretical output voltage of the electronic device;
determining the theoretical wire harness impedance of the grounding wire harness according to the frequency of the control signal and the wire harness parameters; wherein the harness parameters include the diameter D of the grounding harness 0 Length L of the grounding wire harness 0 Distance D between the ground wire harness and the body of the vehicle 1 Self-resistance R of the grounding harness 0 ；
Wherein, according to the frequency of the control signal and the harness parameter, determining the harness theoretical impedance of the grounding harness comprises:
according to the wire harness parameters, determining the wire harness self inductance L of the grounding wire harness r ：
Wherein mu 0 Is vacuum magnetic permeability;
according to the frequency of the control signal and the self inductance L of the wire harness r Determining a theoretical wire harness impedance of the ground wire harness
Wherein f 0 Is the frequency of the control signal;
determining a value range of a 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;
the determining a 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 comprises the following steps:
according to the power supply voltage U of the vehicle-mounted power supply bat Said maximum theoretical output voltage U 0 The circuit measures impedance Z k Constructing the maximum theoretical output voltage U 0 Supply voltage U with the vehicle-mounted power supply bat The circuit measures impedance Z k The harness target impedance Z f A first relation between:
determining the harness target impedance Z according to the first relation f Is a value range of (a);
determining a compensation capacitance and a 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;
the 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 parameter and the wire harness theoretical impedance comprises the following steps:
constructing the target impedance Z of the wire harness according to the frequency of the control signal, the wire harness parameters and the theoretical impedance of the wire harness f Capacitance C with the compensation capacitor 1 Inductance value L of the compensation inductance 1 Frequency f of the control signal 0 Self-resistance R of the grounding harness 0 A second relation between:
according to the second relation and the harness target impedance Z f The value ranges of the compensation capacitors are respectively the capacitance value C of the compensation capacitors 1 And the inductance value L of the compensating inductance 1 Assigning a value;
capacitance C of the compensation capacitor 1 And the inductance value L of the compensating inductance 1 Satisfies the second relation and the harness target impedance Z f And determining the compensation capacitance and the compensation inductance.
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 grounding wire harness, acquiring initial measured impedance of the grounding wire harness;
determining a compensation factor of the grounding wire harness according to the wire harness measurement impedance and the wire harness theoretical impedance;
determining the theoretical compensation impedance of the wire harness of the grounding wire harness according to the compensation factors and the value range of the target impedance of the wire harness;
when the compensation capacitor and the compensation inductor are connected into the grounding wire harness, initial compensation measurement impedance of the grounding wire harness is obtained;
and determining the compensation resistance of the grounding wire harness according to the deviation between the initial compensation measured 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 grounding wire harness, the wire harness compensation measured impedance of the grounding wire harness is obtained;
judging whether the deviation between the wire harness compensation measured impedance and the wire harness theoretical compensation impedance is within an impedance deviation range or not;
if yes, 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 grounding wire harness;
if not, determining the correction resistance of the compensation resistance according to the deviation between the wire harness compensation measured impedance and the wire harness theoretical compensation impedance;
and adding the correction resistor to the compensation resistor to obtain a corrected compensation resistor, and repeatedly executing the steps of obtaining the wire harness compensation measured impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are all connected to the grounding wire harness when the corrected compensation resistor is connected to the grounding wire harness as the compensation resistor.
4. The vehicle grounding wire harness impedance compensation method according to claim 3, further comprising, before repeatedly performing the step of acquiring a harness compensation measured impedance of the grounding wire harness while the compensation resistor, the compensation capacitor, and the compensation inductance are all connected into the grounding wire harness:
judging whether the number of times of acquiring the wire harness compensation measurement impedance of the grounding wire harness exceeds a preset number of times or not when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness in the current repeated execution;
if yes, the compensation capacitance and the compensation inductance of the grounding wire harness are determined again according to the value range of the wire harness target impedance, the wire harness parameters and the wire harness theoretical impedance;
if not, repeating the step of acquiring the wire harness compensation measured impedance of the grounding wire harness when the compensation resistor, the compensation capacitor and the compensation inductor are connected into the grounding wire harness.
5. A vehicle ground harness impedance compensation circuit, comprising: a compensation capacitor and a compensation inductance;
the grounding wire harness is electrically connected between the vehicle grounding 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 the grounding wire harness; the compensation capacitance and the compensation inductance are determined by the vehicle grounding harness impedance compensation method according to any one of claims 1 to 4.
6. The vehicle ground harness impedance compensation circuit of claim 5 further comprising: a compensation resistor;
the compensation resistor, the capacitor and the compensation inductor are sequentially connected in series in a grounding wire harness; the compensation resistance is determined by the vehicle ground wire 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 |
| 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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2021
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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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