阅读说明：本技术 汽车智能发电机输出电流闭环控制方法及系统 (Closed-loop control method and system for output current of intelligent automobile generator ) 是由 郄鹤峰 王高举 苏毅 李溢群 周伟剑 陈江波 张衡 蒋学锋 于 2021-01-08 设计创作，主要内容包括：本发明公开了一种汽车智能发电机输出电流闭环控制控制方法及系统,涉及发动机控制领域,该方法包括在不同的发电机的运转模式下,以不同的励磁电流值向发电机供电,测量对应的输出电流,以构建励磁电流值、发电机转速、输出电压与输出电流之间的对应关系,其中,所述不同运转模式为发电机以不同的转速运转并输出不同的输出电压的模式。根据当前发电机的转速以及输出电压,确认当前的运转模式,并获取当前的励磁电流值,得到当前的输出电流。获取目标电流值,并对应当前的运转模式,查找对应的目标励磁电流值。以目标励磁电流值向发电机供电。本发明能够在不需要外接额外的传感器的情况下,实现发电机输出电流的闭环定量控制。(The invention discloses an output current closed-loop control method and system for an intelligent generator of an automobile, and relates to the field of engine control. And confirming the current operation mode according to the current rotating speed and the output voltage of the generator, and acquiring the current exciting current value to obtain the current output current. And acquiring a target current value, and searching a corresponding target excitation current value corresponding to the current operation mode. And supplying power to the generator at the target excitation current value. The invention can realize the closed-loop quantitative control of the output current of the generator without an external additional sensor.)

1. An output current closed-loop control method of an automobile intelligent generator is characterized by comprising the following steps:

under different operation modes of the generator, supplying power to the generator by different excitation current values, and measuring corresponding output current to construct a corresponding relation among the excitation current value, the rotating speed of the generator, the output voltage and the output current, wherein the different operation modes are modes in which the generator operates at different rotating speeds and outputs different output voltages;

confirming a current operation mode according to the current rotating speed and output voltage of the generator, and acquiring a current exciting current value to obtain a current output current;

acquiring a target current value, and searching a corresponding target excitation current value corresponding to a current operation mode;

and supplying power to the generator at the target excitation current value.

2. The method as claimed in claim 1, wherein the step of measuring the corresponding output current by supplying power to the generator at different excitation current values in different operation modes of the generator, wherein the different operation modes are modes in which the generator operates at different rotation speeds and provides different output voltages, comprises:

acquiring the maximum rotating speed and the minimum rotating speed of the generator and the maximum and the minimum of the output voltage of the generator, and confirming the rotating speed range and the output voltage range of the generator;

equally dividing the generator rotating speed range and the generator output voltage range to obtain a plurality of equally divided nodes, wherein the nodes comprise a plurality of generator rotating speed nodes and a plurality of generator output voltage nodes;

and configuring the output voltage node of each generator to correspond to different generator speed nodes and setting the output voltage nodes to be different operation modes.

3. The method for controlling the closed-loop control of the output current of the intelligent generator of the automobile as claimed in claim 1, wherein after the measuring the corresponding output current, the method comprises:

and confirming the corresponding relation between the exciting current value and the generator load current value under different generator operation modes at different temperatures.

4. The closed-loop control method for the output current of the intelligent generator of the automobile as claimed in claim 3, wherein the step of confirming the corresponding relationship between the excitation current value and the generator load current value in different generator operation modes at different temperatures comprises the following steps:

measuring the highest temperature and the lowest temperature of the working environment of the generator to obtain the temperature range of the working environment of the generator;

equally dividing the temperature range to obtain a plurality of temperature nodes;

and confirming the corresponding relation between the exciting current value and the generator load current value under different operation modes under different temperature nodes.

5. The method as claimed in claim 4, wherein said obtaining a target current value and searching for a corresponding target exciting current value corresponding to a current operation mode comprises:

acquiring a target current value to be regulated, and confirming the running mode of the generator according to the output voltage of the generator and the output rotating speed of the generator;

according to the temperature of the generator and the target current, looking up a table to find the corresponding target excitation current value;

and supplying power to the generator at the target excitation current value.

6. The method as claimed in claim 5, wherein the generator temperature is obtained by a controller, and the exciting current is regulated, wherein the controller comprises a power controller PCU, a vehicle control unit VCU or a HCU.

7. The closed-loop control method for the output current of the intelligent generator of the automobile as claimed in claim 1, characterized in that: and establishing a relation of the rotating speed of the generator, the output voltage of the generator, the exciting current and the output current of the generator according to the corresponding relation of the operation mode, the exciting current value and the output current value of the generator.

8. The closed-loop control method for the output current of the intelligent generator of the automobile as claimed in claim 7, characterized in that: any two parameters of the rotation speed of the generator, the output voltage of the generator, the exciting current and the output current of the generator are known, the other two parameters are confirmed, and the generator is controlled to operate.

9. The utility model provides an automobile intelligence generator output current closed-loop control controlling means which characterized in that, it includes:

the measuring module is used for supplying power to the generator at different exciting current values in different operation modes of the generator and measuring corresponding output current, wherein the different operation modes are modes that the generator operates at different rotating speeds and provides different output voltages;

the state query module is used for confirming the current operation mode according to the current rotating speed and the output voltage of the generator, acquiring the current exciting current value and obtaining the current output current;

the state comparison module is used for acquiring a target current value, and searching a corresponding target excitation current value corresponding to the current operation mode;

and the operation module is used for supplying power to the generator at the target excitation current value.

10. The closed-loop control device for the output current of the intelligent generator of the automobile as claimed in claim 9, wherein the measuring module is further configured to:

measuring the highest temperature and the lowest temperature of the working environment of the generator to obtain the temperature range of the working environment of the generator;

equally dividing the temperature range to obtain a plurality of temperature nodes;

and confirming the corresponding relation between the excitation current value and the generator load current value under different generator operation modes at different temperature nodes.

Technical Field

The invention relates to the field of generator control, in particular to a closed-loop control method and a closed-loop control system for output current of an intelligent generator of an automobile.

Background

Under the large background that global energy is increasingly tense, environmental pressure is increasingly increased, and automobile energy saving work is generally emphasized by countries all over the world, a generator needs to be adjusted to reduce oil consumption required by driving.

At present, most of fuel-oil automobiles generate electricity all the time along with the running of a generator in the running process, but the generated electric energy can be completely used, so that the additional auxiliary energy loss of the generator is caused, and the fuel economy during the running of the automobile is further reduced.

The generator is controlled intelligently by part of automobile factories, a generator regulator is improved on the basis of the traditional generator, and the LIN bus or PWM control instruction is used for controlling the exciting current of the regulator, so that the controller outputs voltage. The output voltage of the generator is controllable, and whether the output is controllable or not is achieved.

The generated energy of the traditional generator is uncontrollable, so that energy consumption is saved, the storage battery is protected, and the dynamic property is optimized. Because the intelligent generator can only control the output voltage of the intelligent generator through a Power Controller (PCU) or a vehicle control unit (HCU or VCU) of the vehicle, the intelligent generator can only control the voltage of the controlled object of the generator, but cannot know and control the current, and belongs to open-loop control. Therefore, the existing published control strategy is based on open-circuit voltage aiming at intelligent generator control, and is open-loop control, so that the current output of the generator cannot be quantitatively optimized.

Furthermore, it is proposed to connect a current sensor to the output power line of the generator, and the PCU performs closed-loop control of the intelligent generator according to the feedback value of the current sensor, but such a system design would increase the cost of at least one current sensor.

Therefore, a method for controlling the output current of the generator without an external sensor is needed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a closed-loop control method and a closed-loop control system for the output current of an intelligent automobile generator, which can realize the closed-loop quantitative control of the output current of the generator without externally connecting an additional sensor.

In order to achieve the above object, in a first aspect, an embodiment of the present invention provides a closed-loop control method for output current of an intelligent generator of an automobile

Under different operation modes of the generator, supplying power to the generator by different excitation current values, and measuring corresponding output current to construct a corresponding relation among the excitation current value, the rotating speed of the generator, the output voltage and the output current, wherein the different operation modes are modes in which the generator operates at different rotating speeds and outputs different output voltages;

confirming a current operation mode according to the current rotating speed and output voltage of the generator, and acquiring a current exciting current value to obtain a current output current;

acquiring a target current value, and searching a corresponding target excitation current value corresponding to a current operation mode;

and supplying power to the generator at the target excitation current value.

As a preferred embodiment, the supplying power to the generator at different exciting current values in different operation modes of the generator, which are modes in which the generator operates at different rotation speeds and supplies different output voltages, and measuring the corresponding output currents, comprises:

acquiring the maximum rotating speed and the minimum rotating speed of the generator and the maximum and the minimum of the output voltage of the generator, and confirming the rotating speed range and the output voltage range of the generator;

equally dividing the generator rotating speed range and the generator output voltage range to obtain a plurality of equally divided nodes, wherein the nodes comprise a plurality of generator rotating speed nodes and a plurality of generator output voltage nodes;

and configuring the output voltage node of each generator to correspond to different generator speed nodes and setting the output voltage nodes to be different operation modes.

As a preferred embodiment, after said measuring the corresponding output current, comprises:

and confirming the corresponding relation between the exciting current value and the generator load current value under different generator operation modes at different temperatures.

As a preferred embodiment, the determining the correspondence relationship between the excitation current value and the generator load current value in different generator operation modes at different temperatures includes:

measuring the highest temperature and the lowest temperature of the working environment of the generator to obtain the temperature range of the working environment of the generator;

equally dividing the temperature range to obtain a plurality of temperature nodes;

and confirming the corresponding relation between the exciting current value and the generator load current value under different operation modes under different temperature nodes.

As a preferred embodiment, the obtaining the target current value and searching for the corresponding target excitation current value corresponding to the current operation mode includes:

acquiring a target current value to be regulated, and confirming the running mode of the generator according to the output voltage of the generator and the output rotating speed of the generator;

according to the temperature of the generator and the target current, looking up a table to find the corresponding target excitation current value;

and supplying power to the generator at the target excitation current value.

As a preferred embodiment, the excitation current is regulated by a controller, which comprises a power supply controller PCU, a vehicle control unit VCU or a HCU.

As a preferred embodiment, the relationship of the generator rotational speed-the generator output voltage-the excitation current-the generator output current is established based on the correspondence relationship of the operation mode, the excitation current value and the generator output current value.

In a preferred embodiment, any two parameters of the generator speed, the generator output voltage, the field current and the generator output current are known, the other two parameters are confirmed, and the generator is controlled to operate.

In a second aspect, an embodiment of the present invention further provides an output current closed-loop control device for an intelligent generator of an automobile, including:

the measuring module is used for supplying power to the generator at different exciting current values in different operation modes of the generator and measuring corresponding output current, wherein the different operation modes are modes that the generator operates at different rotating speeds and provides different output voltages;

the state query module is used for confirming the current operation mode according to the current rotating speed and the output voltage of the generator, acquiring the current exciting current value and obtaining the current output current;

the state comparison module is used for acquiring a target current value, and searching a corresponding target excitation current value corresponding to the current operation mode;

and the operation module is used for supplying power to the generator at the target excitation current value.

As a preferred embodiment, the measurement module is further configured to:

measuring the highest temperature and the lowest temperature of the working environment of the generator to obtain the temperature range of the working environment of the generator;

equally dividing the temperature range to obtain a plurality of temperature nodes;

and confirming the corresponding relation between the excitation current value and the generator load current value under different generator operation modes at different temperature nodes.

Compared with the prior art, the invention has the advantages that:

the running state and the output current of the generator can be confirmed when the generator outputs voltage outwards, and further the output current can be directly adjusted when needing to be adjusted, so that the intelligent generator closed-loop control based on the B + output current is realized, a current sensor does not need to be additionally added, and the quantitative control of the output current (the B + end current) of the generator can be realized under the condition that an external extra sensor is not needed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings corresponding to the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a flowchart illustrating steps of an embodiment of a closed-loop control method for output current of an intelligent power generator of an automobile according to the present invention;

fig. 2 is a flowchart of another step of an embodiment of a closed-loop control method for output current of an intelligent generator of an automobile according to the present invention.

Detailed Description

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a closed-loop control method and system for output current of an intelligent generator of an automobile, which can directly adjust the rotation speed, the output voltage, and the excitation current of a generator without an additional sensor when the output current of the generator needs to be adjusted by determining a relationship between the rotation speed, the output voltage, the excitation current, and the output voltage of the generator.

In order to achieve the technical effects, the general idea of the application is as follows:

and S1, supplying power to the generator at different exciting current values under different generator operation modes, and measuring corresponding output current to construct a corresponding relation among the exciting current value, the generator rotation speed, the output voltage and the output current, wherein the different operation modes are modes that the generator operates at different rotation speeds and outputs different output voltages.

When the generator is required to operate, the generator generally only operates by taking the output voltage as a target value, and the output current is not concerned, and the corresponding relation among the excitation current value, the rotating speed of the generator, the output voltage and the output current of the generator is further determined so as to facilitate the subsequent output current regulation.

Specifically, in different operation modes of the generator, different excitation current values are used for supplying power to the generator, and corresponding output currents are measured, wherein the different operation modes are modes in which the generator operates at different rotating speeds and provides different output voltages, and the method comprises the following steps:

acquiring the maximum rotating speed and the minimum rotating speed of the generator and the maximum and the minimum of the output voltage of the generator, and confirming the rotating speed range and the output voltage range of the generator;

equally dividing the generator rotating speed range and the generator output voltage range to obtain a plurality of equally divided nodes, wherein the nodes comprise a plurality of generator rotating speed nodes and a plurality of generator output voltage nodes;

and configuring the output voltage node of each generator to correspond to different generator speed nodes and setting the output voltage nodes to be different operation modes.

For example, the way to confirm the four relationships is:

and acquiring the rotating speed range of the generator according to the self characteristics of the generator and the actual vehicle use requirements, and confirming the maximum value and the minimum value of the rotating speed range. Equally dividing between the minimum rotating speed and the maximum rotating speed, setting a certain interval, such as 500rpm, and obtaining rotating speed nodes of a plurality of generators.

Similarly, the generator can output a control range of voltage, and the maximum value and the minimum value thereof are confirmed, equally divided between the minimum value and the maximum value, and set at a constant interval. (e.g. 22V-32V, one gear per volt) and the rotating speed node of the generator, a two-dimensional table is established, and each voltage node and any rotating speed node of the generator correspond to a voltage rotating speed module, namely an operation mode. Wherein the two-dimensional table is as in table 1:

TABLE 1

Furthermore, in a voltage rotating speed module, namely in an operation mode, the working condition of the whole vehicle is confirmed to be connected with the characteristics of the generator, and the range of the exciting current is confirmed. And similarly, according to a certain interval, taking a node between the maximum value and the minimum value of the exciting current to obtain an exciting current value node, trying to operate with different load currents, namely the current of the generator in each operation mode of the generator, and measuring the exciting current of the generator. Table 2 was obtained according to table 1:

TABLE 2

According to the table, it can be quickly obtained which output voltage is provided by the generator at which rotating speed, and what output current can be obtained by which exciting current, namely, the relation among the rotating speed, the output voltage, the exciting current and the output current in the generator is confirmed.

Further, in the embodiments of the present invention, at different temperatures, the correspondence relationship between the excitation current value and the generator load current value in different generator operation modes is also confirmed:

measuring the highest temperature and the lowest temperature of the working environment of the generator to obtain the temperature range of the working environment of the generator;

equally dividing the temperature range to obtain a plurality of temperature nodes;

and confirming the corresponding relation between the exciting current value and the generator load current value under different operation modes under different temperature nodes.

It should be noted that the rotation speed and voltage of the generator are used as basic conditions of a pre-installation mode, which can greatly affect the output current of the generator, and other parameters have small effects and are optional measurement conditions. For example, temperature, air pressure, etc. can be used as conditions for measuring the output current in the operation mode, and when the output current of the generator with higher precision is required in the embodiment of the present invention, other parameters of the generator can be taken into consideration to adjust the output current more finely.

Specifically, obtaining a target current value, and searching for a corresponding target excitation current value corresponding to a current operation mode includes:

acquiring a target current value to be regulated, and confirming the running mode of the generator according to the output voltage of the generator and the output rotating speed of the generator;

according to the temperature of the generator and the target current, looking up a table to find the corresponding target excitation current value;

and supplying power to the generator at the target excitation current value.

And S2, confirming the current operation mode according to the current rotating speed and output voltage of the generator, and obtaining the current exciting current value to obtain the current output current.

When the whole vehicle is in a running state, the generator also runs, the vehicle-mounted controller, such as the power supply controller PCU, the vehicle control unit VCU or the HCU, acquires the rotating speed and the output voltage of the generator, and further confirms the current running mode of the generator, and the controller can obtain the current output current of the generator by searching the output voltage, the rotating speed, the exciting current and the output current confirmed in the step S1.

And S3, acquiring a target current value, and searching a corresponding target excitation current value corresponding to the current operation mode.

When the whole vehicle needs to be adjusted to other power utilization modes, such as a power saving mode, a high performance mode and the like, and the output current of the generator needs to be adjusted, the controller can firstly obtain the target current value output by the generator needing to be configured, and then search the corresponding target excitation current value corresponding to the current operation mode.

That is, any two parameters of the generator rotational speed, the generator output voltage, the field current, and the generator output current are known, and the other two parameters are checked to control the generator operation.

And S4, supplying power to the generator at the target excitation current value.

After the target exciting current value is confirmed, power can be supplied to the generator, the running mode of the generator is determined, and three numbers are determined under the corresponding relation of output voltage-rotating speed-exciting current-output current. The generator receives the target exciting current value and generates an output current with the target current value.

As shown in fig. 2, the embodiment of the present invention further exemplifies that the PCU obtains and adjusts the output current of the current generator:

t1, the PCU obtains signals of the rotation speed of the generator, the temperature of the generator, the output voltage of the generator and the like from relevant equipment through a bus and a hard wire;

t2, PCU determines the corresponding "voltage rotation speed module" (and operation mode) according to the output voltage of the generator and the rotation speed of the generator;

t3, PCU searches the corresponding output current value under the searched voltage and rotation speed module according to the temperature of the generator and the excitation power of the generator;

t4, PCU records the current output current;

t5, when the power environment of the whole vehicle changes or other situations and the output current needs to be adjusted, the PCU obtains the target current value needing to be adjusted, and confirms the voltage and rotating speed module of the generator according to the output voltage of the generator and the output rotating speed of the generator;

and T6, the PCU searches and obtains the value of the excitation current of the generator according to the temperature of the generator and the target current value through the relation of four factors of the rotating speed, the output voltage, the excitation current and the output current.

And T7, the PCU sends the value of the searched exciting current to an associated control module of the generator, and the generator outputs the value according to the exciting current.

It should be noted that the software carrier in the embodiment of the present invention may be integrated in the vehicle control unit VCU or HCU, or integrated in the energy management controller PCU, or internal to the engine controller EECU or the vehicle body controller BCM, and the related components are controlled by bus signals or hard wires. All of the above are within the scope of the present solution.

The 24V voltage in the embodiment is mainly suitable for commercial vehicles. If the power system is 12V, only the calibration quantity can be changed, and the control method is not changed.

The division pitches of the generator ranges in tables 1 and 2 are, for example, equal or non-equal divisions of the specific pitch, which are within the scope of the present solution, including division of the generator output rotation speed range, division of the generator output voltage, and division of the excitation current.

Based on the same invention concept, the invention also provides an output current closed-loop control device of the automobile intelligent generator, which comprises:

the measuring module is used for supplying power to the generator at different exciting current values in different operation modes of the generator and measuring corresponding output current, wherein the different operation modes are modes that the generator operates at different rotating speeds and provides different output voltages;

the state query module is used for confirming the current operation mode according to the current rotating speed and the output voltage of the generator, acquiring the current exciting current value and obtaining the current output current;

the state comparison module is used for acquiring a target current value, and searching a corresponding target excitation current value corresponding to the current operation mode;

and the operation module is used for supplying power to the generator at the target excitation current value.

The measurement module is further configured to:

measuring the highest temperature and the lowest temperature of the working environment of the generator to obtain the temperature range of the working environment of the generator;

equally dividing the temperature range to obtain a plurality of temperature nodes;

and confirming the corresponding relation between the excitation current value and the generator load current value under different generator operation modes at different temperature nodes.

Various modifications and specific examples in the foregoing method embodiments are also applicable to the system of the present embodiment, and the detailed description of the method is clear to those skilled in the art, so that the detailed description is omitted here for the sake of brevity.

Generally speaking, the method and system for closed-loop control of the output current of the intelligent generator of the automobile provided by the embodiment of the invention can obtain the relationship of the rotating speed, the output voltage, the exciting current and the output current by confirming the rotating speed modules of the generator and measuring the output currents corresponding to different exciting currents under each rotating speed module, can control the operation of the valve generator from multiple dimensions, and can realize the closed-loop quantitative control of the output current of the generator mainly without externally connecting an additional sensor.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.