Automobile starting circuit characteristic acquisition method and system

Abstract

The invention discloses an automobile starting circuit characteristic acquisition method and system, and a starting loop comprises a storage battery and a starter which form a loop. The automobile starting circuit characteristic acquisition method comprises the following steps: when a starter drags an engine to operate, continuously acquiring multiple groups of data of at least one voltage signal in a starting loop and a current signal of the starting loop; performing data processing on multiple groups of data of the acquired voltage signals and current signals to obtain circuit characteristics of the starting loop; wherein the circuit characteristics comprise at least one of the characteristics of the storage battery, the wiring harness characteristics of the starting loop and the dragging rotating speed of the starter. By analyzing the circuit characteristics, the normal work of a starting loop can be ensured, the design of a starting system is optimized, the energy efficiency of electric energy is improved, and more efficient and safer automobile starting is realized.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a method and system for collecting characteristics of an automobile starting circuit. Background Art

[0002] In the field of automotive technology, batteries are usually needed to power the starter, and the circuit formed by the battery and the starter is called the automobile starting circuit. When the battery has a "false charge" phenomenon, the measured open circuit voltage cannot represent the actual discharge capacity of the battery, and the battery characteristics need to be measured when the battery has a load output. However, the existing technology has defects in calculating the characteristics of the automobile starting circuit. Summary of the invention

[0003] The present invention provides a method and system for collecting characteristics of an automobile starting circuit, which can calculate the circuit characteristics of a starting circuit by using starting stroke data of a starter, thereby ensuring the normal operation of the starting circuit.

[0004] According to one aspect of the present invention, a method for collecting characteristics of a vehicle starting circuit is provided, wherein the starting circuit includes a battery and a starter forming a circuit; the method for collecting characteristics of the vehicle starting circuit includes:

[0005] When the starter drives the engine to run, continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit;

[0006] Data processing is performed on the multiple groups of data of the collected voltage signal and the current signal to obtain the circuit characteristics of the starting circuit; wherein the circuit characteristics include at least one of the characteristics of the battery, the wiring harness characteristics of the starting circuit and the drag speed of the starter.

[0007] According to another aspect of the present invention, there is provided a vehicle starting circuit characteristic acquisition system, comprising:

[0008] A starting circuit, comprising a battery, a starter, a voltage acquisition module and a current acquisition module; the battery and the starter are connected to form a circuit, and the voltage acquisition module and the current acquisition module are used to respectively acquire the voltage and current in the starting circuit;

[0009] A front-end signal processing module, which is used to process the collected voltage sampling signals and current sampling signals and match the signal acquisition port of the back-end host computer;

[0010] A host computer, wherein the host computer has built-in acquisition software, and the acquisition software executes the automobile starting circuit characteristic acquisition method described in any embodiment.

[0011] The technical solution of the embodiment of the present invention obtains the battery characteristics of the starting circuit, the wiring characteristics of the starting circuit and the driving speed of the starter by collecting and processing the voltage data and current data in the starting circuit when the starter drives the generator. Analyzing these circuit characteristics can ensure the normal operation of the starting circuit, thereby optimizing the design of the starting system, improving the energy efficiency of electric energy, and achieving more efficient and safe car starting.

[0012] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 A schematic diagram of an automobile starting circuit provided by an embodiment of the present invention;

[0015] Figure 2 A flow chart of a method for collecting characteristics of an automobile starting circuit provided by an embodiment of the present invention;

[0016] Figure 3 A flow chart of another method for collecting characteristics of an automobile starting circuit provided by an embodiment of the present invention;

[0017] Figure 4 A flow chart of another method for collecting characteristics of an automobile starting circuit provided by an embodiment of the present invention;

[0018] Figure 5 A flow chart of another method for collecting characteristics of an automobile starting circuit provided by an embodiment of the present invention;

[0019] Figure 6 A flow chart of another method for collecting characteristics of an automobile starting circuit provided by an embodiment of the present invention;

[0020] Figure 7 A schematic diagram of a voltage-current acquisition waveform provided by an embodiment of the present invention;

[0021] Figure 8 A schematic diagram of a vehicle starting circuit characteristics acquisition system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including", "etc." and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Figure 1 The following is a schematic diagram of a car starting circuit provided by an embodiment of the present invention. Figure 1 As shown, the automobile starting circuit refers to a circuit for starting the automobile engine, and the starting circuit includes a battery 20 and a starter 10 forming a circuit.

[0025] Among them, the battery 20 refers to a battery module that provides starting energy for the starter 10 of the car. The starter 10 refers to a motor that drives the crankshaft of the car engine and can convert the electrical energy stored in the battery 20 into mechanical energy. V1 represents the positive voltage of the battery, V2 represents the positive terminal voltage of the starter, V3 represents the housing terminal voltage of the starter, I1 represents the loop current, K represents the ignition switch, and S represents the current sensor. For example, when the ignition switch K1 is closed, the starter 10 is electrically started.

[0026] Figure 2 This is a flow chart of a method for collecting characteristics of a vehicle starting circuit provided by an embodiment of the present invention. This embodiment can be applied to calculating the circuit characteristics of a vehicle starting circuit. This method can be executed by a vehicle starting circuit characteristics collection system, which can be implemented in the form of hardware and / or software. Figure 2 As shown, the method includes:

[0027] S110. When the starter drives the engine to operate, continuously collect multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit.

[0028] Among them, the engine refers to the power device in the car that converts the chemical energy of the fuel into mechanical energy. The working process of the car engine usually includes four strokes: intake, compression, power and exhaust. The voltage signal refers to the voltage change information between the battery and the starter in the starting circuit, which reflects the voltage level in the circuit and is usually used to monitor the charging status of the battery and the working condition of the starter. Exemplarily, the voltage signal includes: the positive electrode voltage of the battery, the positive terminal voltage of the starter and the housing terminal voltage of the starter. The current signal refers to the current information in the starting circuit, which is used to evaluate the discharge capacity of the battery and the load condition of the starter. Exemplarily, the current signal includes the loop current, etc.

[0029] Among them, the battery positive voltage refers to the voltage output by the battery in the starting circuit. The starter positive terminal voltage refers to the voltage value measured at the starter positive terminal (the terminal connected to the positive terminal of the battery). The starter housing terminal voltage refers to the voltage value measured at the starter housing. The starter housing is usually grounded, so the starter housing terminal voltage can also be regarded as a reference voltage for electrical grounding, which can ensure that the starter has good grounding during operation. The loop current refers to the current in the starting circuit, which will change with the different operating conditions of the engine.

[0030] Among them, the continuous collection of multiple sets of voltage signals and current signals can collect the electrical performance of the starter throughout the entire working process, so as to fully understand the performance of the battery and starter under different working conditions, and lay a data foundation for the subsequent fitting of the relationship between voltage and current.

[0031] S120, performing data processing on the multiple groups of data of the collected voltage signals and current signals to obtain circuit characteristics of the starting circuit; wherein the circuit characteristics include at least one of the characteristics of the battery, the wiring harness characteristics of the starting circuit, and the drag speed of the starter.

[0032] As mentioned above, during the process of the starter driving the engine, the load on the starter end will change accordingly because the cylinder is in different stroke states. During this process, the discharge current of the battery can adapt to a wide range of load changes. Based on this current characteristic, the embodiment of the present invention uses multiple sets of data of the voltage signal and the current signal when the starter circuit is started to perform data processing, and can analyze the circuit characteristics of the starter circuit to ensure the normal operation of the starter circuit.

[0033] Among them, the characteristics of the battery can be the performance of the battery under different working conditions, including its charging and discharging capabilities, internal resistance, capacity and health status. The wiring harness characteristics of the starting circuit can be the performance of the wiring harness (cable and connector) in the starting circuit during the current and voltage transmission process, illustratively including resistance, conductivity and durability. The drag speed of the starter can be the speed reached by the starter during the starting process. Analyzing the drag speed of the starter can evaluate the efficiency and performance of the starter under different loads to ensure that it can effectively start the engine.

[0034] In an embodiment of the present invention, based on the current variation characteristics of the starter during the starting process, multiple sets of data of the voltage signal and the current signal of the starting circuit when starting are collected and processed, thereby obtaining circuit characteristics of the starting circuit such as battery characteristics, wiring harness characteristics of the starting circuit and drag speed of the starter, and these characteristics are of great significance for ensuring the normal operation, fault diagnosis and system optimization of the automobile starting system.

[0035] Based on the above embodiments, in S120, there are multiple ways to process the multiple sets of data of the collected voltage signals and current signals. In one embodiment, optionally, a linear relationship fitting is performed on the multiple sets of data of the collected voltage signals and current signals.

[0036] Among them, the first-order linear relationship fitting refers to fitting a set of data points into a straight line to establish a linear relationship model between an independent variable (such as voltage) and a dependent variable (such as current). Specifically, the first-order linear relationship fitting can simplify the complex voltage and current data into a linear model, thereby revealing the relationship between voltage and current, which helps to quickly evaluate the performance of the starting circuit. Exemplarily, the first-order linear relationship function module in the Labview software can be used to fit the relationship curve between the collected voltage signal and current signal.

[0037] In another embodiment, optionally, in S120, the data processing method for the multiple sets of data of the collected voltage signals and current signals is: data screening and extraction for the multiple sets of data of the collected voltage signals and current signals.

[0038] Data screening and extraction refers to the process of selecting data points that meet specific conditions or standards from multiple collected voltage and current signals and extracting specific information. Data screening and extraction of collected voltage and current signals can improve the quality and efficiency of data analysis and provide a data basis for performance evaluation and optimization of the starting circuit.

[0039] The technical solution of the embodiment of the present invention obtains the battery characteristics of the starting circuit, the wiring characteristics of the starting circuit and the driving speed of the starter by collecting and processing the voltage data and current data in the starting circuit when the starter drives the generator. Analyzing these circuit characteristics can ensure the normal operation of the starting circuit, thereby optimizing the design of the starting system, improving the energy efficiency of electric energy, and achieving more efficient and safe car starting.

[0040] Figure 3 Flow chart of another method for collecting characteristics of a vehicle starting circuit provided by an embodiment of the present invention. Figure 3 As shown, based on the above embodiments, optionally, when the circuit characteristic is a battery characteristic, the method of continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and the current signal of the starting circuit when the starter drives the engine to run in S110 is further refined. And the method of processing the multiple sets of data of the collected voltage signal and current signal to obtain the circuit characteristic of the starting circuit in S120 is further refined.

[0041] Specifically, the automobile starting circuit characteristic acquisition method comprises the following steps:

[0042] S211. When the starter drives the engine to run, continuously collect multiple sets of data on the positive voltage of the battery and multiple sets of data on the loop current.

[0043] Specifically, collecting multiple sets of battery positive electrode voltage and loop current data can provide a data basis for subsequent fitting of voltage and current data.

[0044] S221. Select at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current.

[0045] The current stable fluctuation range refers to the current data set corresponding to the period of time when the current fluctuates within a relatively stable range during the vehicle startup process. The data in this range represents the current performance of the starting system under normal working conditions, excluding the impact current at the moment of startup and the abnormal current under fault conditions.

[0046] Specifically, the current stable fluctuation range may be determined in combination with actual conditions and engineering experience. For example, an allowable current fluctuation percentage or amplitude is preset to determine the current stable fluctuation range.

[0047] S222 performs a one-time linear fitting of a voltage-current relationship curve on multiple groups of voltage signals and multiple groups of current signals within the stable current fluctuation range.

[0048] Among them, one-time linear relationship fitting refers to the best fitting of a set of data points with a straight line through a linear regression method to describe the linear relationship between variables. The voltage-current relationship curve refers to the relationship curve between the battery positive electrode voltage and the loop current in the starting circuit loop. For example, the horizontal axis is the loop current and the vertical axis is the battery positive electrode voltage.

[0049] Exemplarily, the least square method can be used to fit the voltage signal and the current signal. Specifically, assuming that there is a linear relationship between voltage and current, it can be expressed by the following equation:

[0050] V=aI+b

[0051] Among them, V represents voltage; I represents current; a represents slope; and b represents intercept.

[0052] The goal of fitting is to find the best values ​​of a and b so that the fitted straight line is closest to the given multiple sets of voltage signals and multiple sets of current signals.

[0053] S223. Calculate the battery internal resistance of the battery according to the voltage-current relationship curve.

[0054] Among them, battery internal resistance refers to the resistance of various components inside the battery (such as electrode materials, electrolyte, etc.) to the passage of current. Battery internal resistance is affected by many factors, such as temperature, charging status, battery aging, etc.

[0055] Specifically, the linear relationship between the voltage and the current is fitted using the least squares method using multiple sets of data collected from the positive electrode voltage of the battery and multiple sets of data from the loop current:

[0056] V=aI+b

[0057] The slope a of the fitted linear equation is the internal resistance of the battery. In addition, the intercept b is the open circuit voltage of the battery.

[0058] The technical solution of the embodiment of the present invention obtains the battery internal resistance of the battery by collecting multiple sets of data of the battery positive electrode voltage and multiple sets of data of the loop current and fitting them. The change of the battery internal resistance reflects the health status of the battery, which can help the monitoring device of the circuit starting circuit to timely discover potential battery problems and avoid the vehicle being unable to start or other failures due to battery failure, which is of great significance for improving vehicle safety, extending battery life and reducing maintenance costs.

[0059] Figure 4 Flow chart of another method for collecting characteristics of a vehicle starting circuit provided by an embodiment of the present invention. Figure 4As shown, based on the above embodiments, optionally, when the circuit characteristic is the wiring harness characteristic of the starting circuit, the method of continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and the current signal of the starting circuit when the starter drives the engine to run in S110 is further refined. And the method of performing data processing on the multiple sets of collected voltage signals and current signals in S120 to obtain the circuit characteristics of the starting circuit is further refined.

[0060] Specifically, the automobile starting circuit characteristic acquisition method comprises the following steps:

[0061] S311. When the starter drives the engine to run, continuously collect multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current.

[0062] Specifically, collecting multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current can provide a data basis for subsequently obtaining the internal resistance of the starter positive wiring harness.

[0063] S321. Select at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current.

[0064] S322, according to multiple sets of starter positive terminal voltages and multiple sets of loop currents, obtain the resistance R from the starter positive electrode to the battery negative electrode + .

[0065] Among them, Figure 1 As shown, the resistance R from the positive pole of the starter to the negative pole of the battery + It refers to the resistance from the positive terminal of the starter 10 to the negative terminal of the battery 20.

[0066] Specifically, the resistance R from the positive pole of the starter to the negative pole of the battery + The total resistance of all electrical components that may affect the flow of current, including the connection lines, connectors, contacts, etc. between the positive terminal of the starter and the negative terminal of the battery.

[0067] S323. Obtain the resistance from the starter housing to the negative electrode of the battery according to the multiple sets of starter housing terminal voltages and the multiple sets of loop currents.

[0068] Among them, the resistance from the starter housing to the negative electrode of the battery refers to the resistance from the negative end of the starter to the negative end of the battery.

[0069] S324, according to the resistance R from the positive electrode of the starter to the negative electrode of the battery + And the battery internal resistance of the battery, get the positive wiring harness internal resistance r + ; and, the negative wiring harness internal resistance r is obtained based on the resistance from the starter housing to the negative electrode of the battery - .

[0070] Among them, the positive wiring harness internal resistance r + Refers to the resistance of the wiring harness between the positive pole of the battery and the positive pole of the starter, including the total resistance of all electrical components that may affect the flow of current, such as the connection line, connector, contact point, etc. between the positive pole of the battery and the positive pole of the starter. - It refers to the total resistance of all electrical components that may affect the flow of current, including the connecting lines, connectors, contact points, etc. between the starter housing and the negative terminal of the battery.

[0071] Specifically, the positive wiring harness internal resistance r + It can be calculated by the following formula:

[0072] r + =R + -r

[0073] Where r represents the internal resistance of the battery; R + Represents the resistance from the positive terminal of the starter to the negative terminal of the battery. Figure 1 As shown, the resistance R from the positive pole of the starter to the negative pole of the battery + Subtract the resistance r of battery 20 to get the resistance from the starter positive electrode to the battery positive electrode, that is, the internal resistance r of the positive wiring harness + .

[0074] The technical solution of the embodiment of the present invention calculates the negative wiring harness internal resistance r by collecting multiple sets of data of the starter positive terminal voltage, the starter housing terminal voltage and the loop current. - And the positive wiring harness internal resistance r + Accurately measuring the internal resistance of the wiring harness can early detect wiring harness aging, poor contact or other potential faults, timely discover and solve problems with the wiring harness, and effectively improve the reliability of the vehicle starting process.

[0075] Figure 5 Flow chart of another method for collecting characteristics of a vehicle starting circuit provided by an embodiment of the present invention. Figure 5 As shown, based on the above embodiments, optionally, when the circuit characteristic is the wiring harness characteristic of the starting circuit, for S322, according to multiple sets of starter positive terminal voltages and multiple sets of loop currents, the resistance R from the starter positive electrode to the battery negative electrode is obtained. + And / or, the method of S323, obtaining the resistance from the starter housing to the negative electrode of the battery according to multiple sets of starter housing terminal voltages and multiple sets of loop currents, is further refined.

[0076] Specifically, the automobile starting circuit characteristic acquisition method comprises the following steps:

[0077] S411. When the starter drives the engine to run, continuously collect multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current.

[0078] S421. Select at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current.

[0079] S422, performing a one-time linear relationship fitting of a voltage-current relationship curve from the starter positive electrode to the battery negative electrode for multiple groups of starter positive terminal voltages and multiple groups of loop currents within the current stable fluctuation range.

[0080] For example, the least square method can be used to perform a linear relationship fitting. Specifically, by fitting the relationship between the positive terminal voltage of the starter and the loop current, the linear relationship between the two can be revealed, which is used for the subsequent calculation of the resistance R from the positive electrode of the starter to the negative electrode of the battery. + Provide data foundation.

[0081] S423, calculate the resistance R from the starter positive electrode to the battery negative electrode according to the voltage-current relationship curve from the starter positive electrode to the battery negative electrode + .

[0082] Specifically, a set of starter positive terminal voltage and corresponding current can be selected from the fitted voltage-current relationship curve, and then substituted into Ohm's law formula to calculate the resistance R + .

[0083] S424, performing a one-time linear fitting of the voltage-current relationship curve from the starter housing to the negative electrode of the battery for multiple groups of starter housing terminal voltages and multiple groups of loop currents within the current stable fluctuation range.

[0084] Exemplarily, the least square method may be used to perform a one-time linear relationship fitting on multiple sets of starter housing terminal voltages and multiple sets of loop currents.

[0085] Specifically, by performing a one-time linear relationship fitting on multiple groups of starter housing terminal voltages and multiple groups of loop currents, the relationship between the starter housing terminal voltage and the loop current can be revealed, providing a data basis for subsequent resistance calculations.

[0086] S425. Calculate the resistance from the starter housing to the negative electrode of the battery according to the voltage-current relationship curve from the starter housing to the negative electrode of the battery.

[0087] Specifically, a set of battery negative electrode voltage and corresponding current can be selected from the fitted voltage-current relationship curve, and the voltage and current can be substituted into the Ohm's law formula to calculate the resistance from the starter housing to the battery negative electrode.

[0088] S426, according to the resistance R from the positive electrode of the starter to the negative electrode of the battery + And the battery internal resistance of the battery, get the positive wiring harness internal resistance r + ; and, the negative wiring harness internal resistance r is obtained based on the resistance from the starter housing to the negative electrode of the battery- .

[0089] The technical solution of the embodiment of the present invention calculates the negative wiring harness internal resistance r by collecting multiple sets of data of the starter positive terminal voltage, the starter housing terminal voltage and the loop current. - And the positive wiring harness internal resistance r + Accurately measuring the internal resistance of the wiring harness can early detect wiring harness aging, poor contact or other potential faults, timely discover and solve problems with the wiring harness, and effectively improve the reliability of the vehicle starting process.

[0090] Figure 6 Flow chart of another method for collecting characteristics of a vehicle starting circuit provided by an embodiment of the present invention. Figure 6 As shown, based on the above embodiments, optionally, when the circuit characteristic is the drag speed of the starter, the method of continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and the current signal of the starting circuit when the starter is driving the engine is further refined in S110. And, the method of processing the multiple sets of data of the collected voltage signal and current signal to obtain the circuit characteristic of the starting circuit in S120 is further refined.

[0091] Specifically, the automobile starting circuit characteristic acquisition method comprises the following steps:

[0092] S511. When the starter drives the engine to run, continuously collect multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current.

[0093] Specifically, collecting multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current can provide a data basis for subsequently calculating the current speed of the engine.

[0094] S521. Select at least two compression stroke data that cause the current to increase steadily from multiple groups of loop current data.

[0095] The compression stroke refers to a working cycle stage of an internal combustion engine. Among the four strokes of an internal combustion engine (intake, compression, power, exhaust), the compression stroke refers to the stage when the combustible mixture (gasoline engine) or air (diesel engine) in the cylinder is compressed during the movement of the piston from the bottom dead center to the top dead center.

[0096] Specifically, during the compression stroke of the internal combustion engine, the engine needs to overcome the compression resistance of the gas in the cylinder. This resistance significantly increases the power required by the engine at this stage, which in turn increases the load on the starter. As the load increases, the current driving the engine also increases. Therefore, during the working cycle of the internal combustion engine, the change in current fluctuates, which is manifested in different current requirements in different working stages (such as starting, compression, combustion and exhaust).

[0097] S522, calculating multiple sets of starter positive terminal voltages, multiple sets of starter housing terminal voltages, and multiple sets of loop currents within a stable current widening range to obtain a current speed of the engine.

[0098] Among them, the current speed of the engine refers to the rotation speed of the engine at a specific point in time, which reflects the working status and output power of the engine, and directly affects the acceleration performance and fuel efficiency of the vehicle.

[0099] For example, Figure 7 A schematic diagram of a voltage-current acquisition waveform provided by an embodiment of the present invention, wherein V1 (blue curve) represents the positive voltage of the battery, V2 (green curve) represents the positive terminal voltage of the starter, V3 (yellow curve) represents the voltage of the starter housing, and I1 (red curve) represents the loop current. Figure 7 As shown, after collecting the voltage and current signals, in Labview software, the cursor is dragged to quickly select the data within the range where the current is stable and increasing. In the embodiment of the present invention, the t0-t1 stage is selected. In the t0-t1 stage, the current has a significant increase phenomenon, and the Labview software can calculate the current speed of the engine based on the voltage and current data within the selected range.

[0100] Figure 8 A schematic diagram of a vehicle starting circuit characteristic acquisition system provided by an embodiment of the present invention. Based on the above embodiment, optionally, Figure 8 As shown, the automobile starting circuit characteristic acquisition system includes:

[0101] The starting circuit 610 includes a battery, a starter, a voltage acquisition module and a current acquisition module; the battery and the starter are connected to form a circuit, and the voltage acquisition module and the current acquisition module are used to collect the voltage and current in the starting circuit 610 respectively.

[0102] The front-end signal processing module 620 is used to process the collected voltage sampling signal and current sampling signal to match the signal acquisition port of the back-end host computer.

[0103] The host computer 630 has built-in acquisition software 631, and the acquisition software 631 executes the automobile starting circuit characteristic acquisition method of any of the above embodiments.

[0104] Optionally, the acquisition software 631 includes:

[0105] The collection and storage module 632 is used to continuously collect and store multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit when the starter drives the engine to run;

[0106] The characteristic calculation module 633 is used to process the multiple sets of data of the collected voltage signal and current signal to obtain the circuit characteristics of the starting circuit.

[0107] Optionally, the front-end signal processing module 620 includes:

[0108] A signal processing card 621, the signal processing card 621 is used to perform voltage reduction processing on the collected voltage signal and current signal;

[0109] The acquisition card 622 is used to convert the stepped-down voltage signal and current signal into common ground analog quantities.

[0110] The automobile starting circuit characteristic acquisition system provided by the embodiment of the present invention can execute the automobile starting circuit characteristic acquisition method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0111] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0112] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for collecting characteristics of a vehicle starting circuit, characterized in that: The starting circuit includes a battery and a starter forming a circuit; the method for collecting characteristics of the automobile starting circuit includes: When the starter drives the engine to run, continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit; Data processing is performed on the multiple groups of data of the collected voltage signal and the current signal to obtain the circuit characteristics of the starting circuit; wherein the circuit characteristics include at least one of the characteristics of the battery, the wiring harness characteristics of the starting circuit and the drag speed of the starter.

2. The method for collecting characteristics of a vehicle starting circuit according to claim 1, characterized in that: The voltage signal includes: at least one of a battery positive electrode voltage, a starter positive terminal voltage, and a starter housing terminal voltage; The current signal includes: loop current.

3. The method for collecting characteristics of a vehicle starting circuit according to claim 1, characterized in that: The data processing of the multiple sets of collected data of the voltage signal and the current signal includes at least one of the following: Performing a linear relationship fitting on the multiple sets of data collected of the voltage signal and the current signal; Data screening and extraction are performed on the multiple groups of data of the collected voltage signal and the current signal.

4. The method for collecting characteristics of a vehicle starting circuit according to any one of claims 1 to 3, characterized in that: The circuit characteristics obtained are the characteristics of the battery; When the starter drives the engine to run, continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit, including: When the starter drives the engine to run, multiple sets of data on the positive voltage of the battery and multiple sets of data on the loop current are continuously collected; The step of processing the collected multiple sets of data of the voltage signal and the current signal to obtain the circuit characteristics of the starting circuit includes: Selecting at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current; Performing a one-time linear relationship fitting of a voltage-current relationship curve on a plurality of groups of voltage signals and a plurality of groups of current signals within a stable current fluctuation range; The battery internal resistance of the battery is calculated according to the voltage-current relationship curve.

5. The method for collecting characteristics of a vehicle starting circuit according to any one of claims 1 to 3, characterized in that: The circuit characteristics obtained are the wiring harness characteristics of the starting circuit; When the starter drives the engine to run, continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit, including: When the starter drives the engine to run, multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current are continuously collected; The step of processing the collected multiple sets of data of the voltage signal and the current signal to obtain the circuit characteristics of the starting circuit includes: Selecting at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current; According to the multiple sets of starter positive terminal voltages and the multiple sets of loop currents, the resistance R from the starter positive electrode to the battery negative electrode is obtained. + ; Obtaining the resistance from the starter housing to the negative electrode of the battery according to the multiple sets of starter housing terminal voltages and the multiple sets of loop currents; According to the resistance R from the positive electrode of the starter to the negative electrode of the battery + and the battery internal resistance of the battery, and obtain the positive wiring harness internal resistance r + ; and, the negative wiring harness internal resistance r is obtained based on the resistance from the starter housing to the negative electrode of the battery - .

6. The method for collecting characteristics of a vehicle starting circuit according to claim 5, characterized in that: The resistance R from the positive electrode of the starter to the negative electrode of the battery is obtained according to the multiple sets of positive terminal voltages of the starter and the multiple sets of loop currents. + ,include: Selecting at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current; Performing a one-time linear fitting of the voltage-current relationship curve from the starter positive electrode to the battery negative electrode for multiple groups of the starter positive terminal voltages and multiple groups of the loop currents within the current stable fluctuation range; The resistance R from the starter positive electrode to the battery negative electrode is calculated according to the voltage-current relationship curve from the starter positive electrode to the battery negative electrode. + ; And / or, according to the plurality of groups of starter housing terminal voltages and the plurality of groups of loop currents, obtaining the resistance from the starter housing to the negative electrode of the battery, including: Selecting at least part of the data of the stable fluctuation range of the current from the multiple groups of data of the loop current; Performing a one-time linear relationship fitting of a voltage-current relationship curve from the starter housing to the negative electrode of the battery for multiple groups of the starter housing terminal voltages and multiple groups of the loop currents within the current stable fluctuation range; The resistance from the starter housing to the battery negative electrode is calculated according to the voltage-current relationship curve from the starter housing to the battery negative electrode.

7. The method for collecting characteristics of a vehicle starting circuit according to any one of claims 1 to 3, characterized in that: The circuit characteristic obtained is the drag speed of the starter; When the starter drives the engine to run, continuously collecting multiple sets of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit, including: When the starter drives the engine to run, multiple sets of data on the starter positive terminal voltage, the starter housing terminal voltage and the loop current are continuously collected; The step of processing the collected multiple sets of data of the voltage signal and the current signal to obtain the circuit characteristics of the starting circuit includes: Selecting data of at least two compression strokes causing the current to become steadily larger from the multiple sets of data of the loop current; The current speed of the engine is obtained by calculating multiple sets of starter positive terminal voltages, multiple sets of starter housing terminal voltages and multiple sets of loop currents within a stable current widening range.

8. A vehicle starting circuit characteristics acquisition system, characterized in that: include: A starting circuit, comprising a battery, a starter, a voltage acquisition module and a current acquisition module; the battery and the starter are connected to form a circuit, and the voltage acquisition module and the current acquisition module are used to respectively acquire the voltage and current in the starting circuit; A front-end signal processing module, which is used to process the collected voltage sampling signals and current sampling signals and match the signal acquisition port of the back-end host computer; A host computer, wherein the host computer has built-in acquisition software, and the acquisition software executes the automobile starting circuit characteristic acquisition method as described in any one of claims 1-7.

9. The automobile starting circuit characteristic acquisition system according to claim 8, characterized in that: The acquisition software includes: A collection and storage module, used for continuously collecting and storing multiple groups of data of at least one voltage signal in the starting circuit and a current signal of the starting circuit when the starter drives the engine to run; The characteristic calculation module is used to process the multiple sets of data of the collected voltage signal and the current signal to obtain the circuit characteristics of the starting circuit.

10. The automobile starting circuit characteristic acquisition system according to claim 8, characterized in that: The front-end signal processing module comprises: A signal processing card, wherein the signal processing card is used to perform voltage reduction processing on the collected voltage signal and current signal; The acquisition card is used to convert the stepped-down voltage signal and current signal into a common ground analog quantity.

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