阅读说明：本技术 一种发电机控制方法及其系统 (Generator control method and system ) 是由 李埠 阮先轸 刘新波 马彪 于 2019-09-04 设计创作，主要内容包括：本发明涉及一种发电机控制方法及其系统,所述方法包括通过信息检测元件获取汽车蓄电池的充放电信息以及发电机的占空比信息,然后通过发动机控制器和发电机调节器共同实现根据所述充放电信息和占空比信息控制汽车发电机运行,实现整车稳压；其中,若汽车蓄电池处于放电状态且发电机占空比大于预设比例阈值,则解除发电机励磁电流限制。本发明通过调整发电机控制逻辑以及调节器中主要参数的设置从而实现稳定整车电压,避免增加DC/DC变换器。(The invention relates to a generator control method and a system thereof, wherein the method comprises the steps of obtaining charge and discharge information of an automobile storage battery and duty ratio information of a generator through an information detection element, and controlling the operation of an automobile generator according to the charge and discharge information and the duty ratio information through an engine controller and a generator regulator together to realize the voltage stabilization of the whole automobile; and if the automobile storage battery is in a discharging state and the duty ratio of the generator is greater than a preset proportion threshold value, the limit of the excitation current of the generator is removed. The invention realizes the stabilization of the voltage of the whole vehicle by adjusting the control logic of the generator and the setting of main parameters in the regulator, and avoids adding a DC/DC converter.)

1. A method of controlling an automotive alternator, comprising:

acquiring charge and discharge information of an automobile storage battery and duty ratio information of a generator;

controlling the automobile generator to operate according to the charging and discharging information and the duty ratio information; and if the automobile storage battery is in a discharging state and the duty ratio of the generator is greater than a preset proportion threshold value, the limit of the excitation current of the generator is removed.

2. The vehicle generator control method according to claim 1, wherein a load response delay time of the vehicle generator is set to 3 seconds.

3. The vehicle generator control method according to claim 1, characterized by further comprising:

acquiring temperature information of a generator;

and adjusting the voltage of the automobile generator according to the comparison result of the temperature of the generator and a preset temperature threshold value.

4. The vehicle generator control method according to claim 3, wherein the preset temperature threshold includes at least a first temperature threshold and a second temperature threshold, and the first temperature threshold is smaller than the second temperature threshold;

the step of adjusting the voltage of the automobile generator according to the comparison result of the temperature of the generator and the preset temperature threshold specifically comprises the following steps:

when the generator temperature is greater than the first temperature threshold and less than the second temperature threshold, the vehicle generator voltage is adjusted to y1, where y1 ═ f (x)₁)-k1×T；

When the generator temperature is greater than the second temperature threshold, the vehicle generator voltage is adjusted to y2, where y2 ═ f (x)₂)-k1×T；

Wherein, f (x)₁) Is equal to the first temperature threshold value x₁Corresponding predetermined voltage value, f (x)₂) Is equal to the second temperature threshold value x₂And k1 is a generator temperature compensation coefficient, and T is the temperature of the automobile generator.

5. The vehicle generator control method according to claim 1, characterized by further comprising:

acquiring voltage information of the whole vehicle;

and controlling the generator to operate according to the voltage information of the whole vehicle and a preset voltage threshold, wherein if the voltage of the whole vehicle is smaller than the preset voltage threshold, the excitation current limit of the generator is removed.

6. The method for controlling the generator of the vehicle according to claim 1, wherein the controlling the generator of the vehicle to operate according to the charging and discharging information and the duty ratio information further comprises:

if the automobile storage battery is in a discharging state, according to the formulaCalculating a generator voltage adjustment value and setting a generator voltage as the generator voltage adjustment value;

where k2 is the voltage compensation coefficient, U_altFor generator voltage in the discharged state of the accumulator, U_batIs the cell voltage in the discharged state of the storage battery, R is steamVehicle power supply loop resistance.

7. An automotive generator control system, comprising:

the information detection element is used for acquiring the charging and discharging information of the automobile storage battery and the duty ratio information of the generator;

the control unit is used for controlling the operation of the automobile generator according to the charging and discharging information and the duty ratio information;

the control unit comprises an engine controller and a generator regulator, if the automobile storage battery is in a discharging state and the duty ratio of the generator is larger than a preset proportional threshold, the engine controller generates a first control instruction, and the generator regulator removes the limit of the excitation current of the generator according to the first control instruction.

8. The vehicle generator control system of claim 7, wherein the information detection component is further configured to obtain generator temperature information; the generator regulator is also used for regulating the voltage of the automobile generator according to the comparison result of the temperature of the generator and a preset temperature threshold value; the preset temperature threshold at least comprises a first temperature threshold and a second temperature threshold, and the first temperature threshold is smaller than the second temperature threshold;

wherein the generator regulator regulates the vehicle generator voltage to y1 when the generator temperature is greater than a first temperature threshold and less than a second temperature threshold, wherein y1 ═ f (x 3578)₁) -k1 × T; when the generator temperature is greater than a second temperature threshold, the generator regulator regulates the vehicle generator voltage to y2, where y2 ═ f (x)₂) -k1 × T; wherein, f (x)₁) Is equal to the first temperature threshold value x₁Corresponding predetermined voltage value, f (x)₂) Is equal to the second temperature threshold value x₂And k1 is a generator temperature compensation coefficient, and T is the temperature of the automobile generator.

9. The vehicle generator control system of claim 7, wherein the information detection element is further configured to obtain vehicle voltage information; the generator regulator is also used for controlling the generator to operate according to the whole vehicle voltage information and a preset voltage threshold, wherein if the whole vehicle voltage is smaller than the preset voltage threshold, the limit of the excitation current of the generator is removed.

10. The vehicle generator control system of claim 7, wherein the engine controller is configured to calculate the formula based on the vehicle battery discharge conditionCalculating voltage regulation value U of generator_setWhere K is the voltage compensation coefficient, U_altFor generator voltage in the discharged state of the accumulator, U_batThe voltage is the battery voltage of the storage battery in a discharging state, and R is the resistance of the automobile power supply loop; the generator regulator is configured to set a generator voltage to the generator voltage regulation value and to set the generator voltage to the generator voltage regulation value.

Technical Field

The invention relates to the technical field of automobile generator control, in particular to a generator control method and a system thereof.

Background

With the rapid development of automobile electronic technology, the traditional electronic electrical appliances and intelligent networking technology are changing day by day, the electrical appliance systems and the control modules are greatly increased, so that the consumed power of the electric appliance systems of the whole automobile is increased, the electric appliance systems of the whole automobile have higher and higher requirements on electric energy, and the maintenance of the voltage stability of the whole automobile by a power supply system of the whole automobile has an important influence on the improvement of the comfort of users in using the automobile. Especially, vehicles with high-end configuration have abundant power consumption configuration, but not all electric appliances have voltage stabilizing components, and the stability and comfort of the functions of the electric appliances have high requirements on the voltage of the whole vehicle. If the voltage of the whole vehicle is instantly lowered, the reset and restart of partial electric devices can be caused, the driving comfort is influenced, and the subjective evaluation feeling of a user is influenced; if the voltage fluctuation range of the whole vehicle is large and cannot be maintained stably, the stability of part of electric appliances is influenced; if the voltage of the whole vehicle is instantly increased and exceeds the normal working voltage of part of electric appliances, the power consumption of the whole vehicle is increased rapidly, and components can be damaged in serious cases. At present, the electrical appliances of the passenger cars are rich and richer, and maintaining the voltage stability of the whole car is a necessary means for ensuring the stability of the electrical appliances of the whole car and improving the driving feeling of users.

At present, most vehicle types do not consider the control logic for optimizing the voltage of the whole vehicle from the strategic aspect, but increase a DC/DC converter to realize a method for stabilizing the voltage of an electric appliance. The input voltage of an electric device in the passenger vehicle, which influences the self function or stability of the voltage change of the whole vehicle, is connected to the output end of the DC/DC converter, so that the terminal voltages at two ends of the electric device are stabilized. However, the terminal voltage of the electrical appliance is stabilized by adopting the DC/DC converter, and as the load of the electrical appliance increases, the power, the weight and the cost must be increased for the DC/DC model selection, and the requirements for the arrangement space and the mounting bracket of the DC/DC converter are increased, so that the situation that the arrangement cannot be performed on a passenger vehicle occurs.

Disclosure of Invention

The invention aims to provide a generator control method and a system thereof, which can realize the stabilization of the voltage of the whole vehicle and avoid the increase of a DC/DC converter by adjusting the control logic of a generator and the setting of main parameters in a regulator.

In a first aspect, an embodiment of the present invention provides a method for controlling an automotive generator, including:

acquiring charge and discharge information of an automobile storage battery and duty ratio information of a generator;

controlling the automobile generator to operate according to the charging and discharging information and the duty ratio information; and if the automobile storage battery is in a discharging state and the duty ratio of the generator is greater than a preset proportion threshold value, the limit of the excitation current of the generator is removed.

Wherein the load response delay time of the automobile generator is set to 3 seconds.

Wherein the method further comprises:

acquiring temperature information of a generator;

and adjusting the voltage of the automobile generator according to the comparison result of the temperature of the generator and a preset temperature threshold value.

The preset temperature threshold at least comprises a first temperature threshold and a second temperature threshold, and the first temperature threshold is smaller than the second temperature threshold;

the step of adjusting the voltage of the automobile generator according to the comparison result of the temperature of the generator and the preset temperature threshold specifically comprises the following steps:

when the generator temperature is greater than the first temperature threshold and less than the second temperature threshold, the vehicle generator voltage is adjusted to y1, where y1 ═ f (x)₁)-k1×T；

When the generator temperature is greater than the second temperature threshold, the vehicle generator voltage is adjusted to y2, where y2 ═ f (x)₂)-k1×T；

Wherein, f (x)₁) Is equal to the first temperature threshold value x₁Corresponding predetermined voltage value, f (x)₂) Is equal to the second temperature threshold value x₂And k1 is a generator temperature compensation coefficient, and T is the temperature of the automobile generator.

Wherein the method further comprises:

acquiring voltage information of the whole vehicle;

and controlling the generator to operate according to the voltage information of the whole vehicle and a preset voltage threshold, wherein if the voltage of the whole vehicle is smaller than the preset voltage threshold, the excitation current limit of the generator is removed.

Wherein, the controlling the operation of the automobile generator according to the charging and discharging information and the duty ratio information further comprises:

if the automobile storage battery is in a discharging state, according to the formulaCalculating a generator voltage adjustment value and setting a generator voltage as the generator voltage adjustment value; k2 is the voltage compensation factor, U_altFor generator voltage in the discharged state of the accumulator, U_batThe voltage of the battery in the discharging state of the storage battery is R, and the resistance of the automobile power supply loop is R.

In a second aspect, an embodiment of the present invention provides a generator control system, including:

the information detection element is used for acquiring the charging and discharging information of the automobile storage battery and the duty ratio information of the generator;

the control unit is used for controlling the operation of the automobile generator according to the charging and discharging information and the duty ratio information;

the control unit comprises an engine controller and a generator regulator, if the automobile storage battery is in a discharging state and the duty ratio of the generator is larger than a preset proportional threshold, the engine controller generates a first control instruction, and the generator regulator removes the limit of the excitation current of the generator according to the first control instruction.

The information detection element is also used for acquiring generator temperature information; the generator regulator is also used for regulating the voltage of the automobile generator according to the comparison result of the temperature of the generator and a preset temperature threshold value; the preset temperature threshold at least comprises a first temperature threshold and a second temperature threshold, and the first temperature threshold is smaller than the second temperature threshold; the generator regulator regulates the vehicle generator voltage to y1 when the generator temperature is greater than a first temperature threshold and less than a second temperature threshold, where y1 ═ f (x) is₁) -k1 × T; when the generator temperature is greater than a second temperature threshold, the generator regulator regulates the vehicle generator voltage to y2, where y2 ═ f (x)₂) -k1 × T; wherein, f (x)₁) Is equal to the first temperature threshold value x₁Corresponding predetermined voltage value, f (x)₂) Is equal to the second temperature threshold value x₂Correspond toK1 is the temperature compensation coefficient of the generator, and T is the temperature of the automobile generator.

The information detection element is also used for acquiring voltage information of the whole vehicle; the generator regulator is also used for controlling the generator to operate according to the whole vehicle voltage information and a preset voltage threshold, wherein if the whole vehicle voltage is smaller than the preset voltage threshold, the limit of the excitation current of the generator is removed.

Wherein if the vehicle battery is in a discharged state, the engine controller is configured to operate according to a formulaCalculating voltage regulation value U of generator_setWhere K is the voltage compensation coefficient, U_altFor generator voltage in the discharged state of the accumulator, U_batThe voltage is the battery voltage of the storage battery in a discharging state, and R is the resistance of the automobile power supply loop; the generator regulator is configured to set a generator voltage to the generator voltage regulation value and to set the generator voltage to the generator voltage regulation value.

Compared with the prior art, the improvement of the embodiment of the invention does not relate to hardware cost increase and weight increase, and the voltage of the generator is controlled by the engine controller and the generator regulator together according to different working conditions, so that the voltage of the whole vehicle is stabilized, the performance of electric appliances of the vehicle is more reliable, the probability of resetting or abnormity of the electric appliances is greatly reduced, and the electric system of the whole vehicle is more stable. For the voltage-sensitive electric load, the voltage stability of the whole vehicle can reduce the function fluctuation of the electric appliance, the function fluctuation is reflected on the experience of the user most visually, the power fluctuation (such as the brightness change of a halogen lamp) of the electric appliance caused by the voltage fluctuation of the whole vehicle can be obviously improved, and the user experience is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

Drawings

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

Fig. 1 is a schematic flow chart of a method for controlling an automotive alternator according to a first embodiment.

Fig. 2 is a schematic structural diagram of a control system of an automobile generator according to a second embodiment.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means have not been described in detail so as not to obscure the present invention.

Example one

An embodiment one of the present invention provides a method for controlling an automotive alternator, which may be applied to, for example, the automotive alternator control system described in embodiment two, the automotive alternator control system including an information detection element and a control unit, the control unit including an engine controller and an alternator regulator.

Fig. 1 is a schematic flow chart of a control method of an automobile generator according to a first embodiment, and referring to fig. 1, the method includes the following steps:

and S101, acquiring charging and discharging information of an automobile storage battery and duty ratio information of a generator.

Specifically, the information detection element may include a first information detection element and a second information detection element, and the first information detection element detects the charge and discharge information of the automobile storage battery and the second information detection element detects the duty ratio information of the generator; the charging and discharging information is that the automobile is in a charging state or a discharging state.

Step S102, controlling the automobile generator to operate according to the charging and discharging information and the duty ratio information; and if the automobile storage battery is in a discharging state and the duty ratio of the generator is greater than a preset proportion threshold value, the limit of the excitation current of the generator is removed.

Specifically, in the step, the engine controller judges whether the electric load of the whole vehicle reaches the power output limit of the generator at the rotating speed according to the charging and discharging information and the duty ratio information, wherein if the duty ratio of the generator is close to 100% and the storage battery of the vehicle is in a discharging state, the electric load of the whole vehicle is high, and the storage battery of the vehicle needs to be used as an auxiliary power supply to supply power to electric appliances of the whole vehicle. The generator exciting current limitation is removed through the engine controller and the generator regulator along with the rise of the rotating speed of the engine, the engine controller sends a signal of exciting current limitation to the generator regulator, and the generator regulator performs corresponding operation to remove the generator exciting current limitation after receiving the signal, so that the aim of stabilizing the voltage of the whole vehicle is fulfilled.

In this embodiment, the preset proportional threshold is 90%.

If the duty ratio of the generator does not reach more than 90 percent and the automobile storage battery is in a charging state, the electric quantity of the automobile storage battery is high, the electric load of the whole automobile is small, and the automobile generator does not need to respond according to the change of the excitation current step length along with the increase of the rotating speed of the automobile engine.

If the duty ratio of the generator reaches more than 90% and the automobile storage battery is in a charging state, the electric quantity of the automobile storage battery is low, but the electric load of the whole automobile is small, and the automobile generator does not need to respond according to the change of the excitation current step length along with the increase of the rotating speed of the automobile engine.

Wherein, the step S102 further includes:

if the automobile storage battery is in a discharging state, according to the formulaCalculating a generator voltage adjustment value and setting a generator voltage as the generator voltage adjustment value; k2 is the voltage compensation factor, U_altFor generator voltage in the discharged state of the accumulator, U_batThe voltage of the battery in the discharging state of the storage battery is R, and the resistance of the automobile power supply loop is R.

Specifically, in the step, the engine controller obtains the set voltage U at the generator end through calculation according to the generator voltage and the battery voltage in the discharging state of the automobile storage battery_setI.e. the generator voltage regulation value, when the vehicle battery is in a charged state, the calculation of the generator voltage regulation value is not performed. In the step, the engine controller calculates the regulation and control voltage range after the rotating speed changes, the control logic does not involve hardware cost increase and weight increase, and a better voltage stabilization effect can be realized, so that the functions and stability of the electric appliance of the whole vehicle are ensured.

Wherein a load response delay time (LRC) of the automobile generator is set to 3 seconds.

Specifically, the load response delay time means that if the entire vehicle is turned on with a large electric load, the generator torque consumption increases, which may cause the generator speed to fluctuate, especially in the idle state of the generator. The increasing speed of the duty ratio can be limited through the LRC parameter, if the climbing time is long, the torque increase of the generator is correspondingly slowed down, and the effect of protecting the engine can also be achieved. The LRC parameter plays an important role in stabilizing the voltage of the whole vehicle, if the current duty ratio of the generator is 30%, the duty ratio is increased to 80% after the electric appliance is opened, the effective time (LRC) for adjusting the duty ratio of 50% is 1.5s, if the LRC setting time is too long, the duty ratio of the generator is stabilized in the process of 0-100%, in the process of reducing the rotating speed of the generator after the rotating speed of the generator is increased, the LRC function can cause the generator not to generate power instantly, and the voltage can be recovered to be normal after dropping instantly. Therefore, in the embodiment, the LRC parameter of the generator is set to be 3s by controlling the generator regulator in the engine controller, so that the LRC time is controlled to be 3s at each engine speed, and the voltage of the generator is stable in the whole power generation process.

Wherein the method further comprises the steps of:

step S201, obtaining temperature information of a generator;

and S202, adjusting the voltage of the automobile generator according to the comparison result of the temperature of the generator and a preset temperature threshold value, so that the high-temperature compensation function of the voltage of the generator is realized.

In particular, the preset temperature threshold comprises a plurality of temperature thresholds, for example, the ith temperature threshold is set as x_iTemperature threshold value x_iLess than a temperature threshold x_i+1。

When the temperature of the generator is greater than the temperature threshold value x_iAnd is less than a temperature threshold value x_i+1When the voltage of the automobile generator is regulated to y by the generator regulator_iWherein y is_i＝f(x_i)-k1×T。

When the temperature of the generator is larger than a second temperature threshold value, the voltage of the automobile generator is regulated to y through the generator regulator_i+1Wherein y is_i+1＝f(x_i+1)-k1×T。

Wherein, f (x)_i) Is related to a temperature threshold value x_iCorresponding predetermined voltage value, f (x)_i+1) Is related to a temperature threshold value x_i+1And k1 is a generator temperature compensation coefficient, and T is the temperature of the automobile generator.

For example, the preset temperature threshold at least comprises a first temperature threshold and a second temperature threshold, and the first temperature threshold is smaller than the second temperature threshold; said step S202 comprises:

when the temperature of the generator is greater than the first temperature threshold and less than the second temperature threshold, the automobile is powered through the generator regulatorThe motor voltage is regulated to y1, where y1 ═ f (x)₁)-k1×T。

When the generator temperature is greater than the second temperature threshold, the vehicle generator voltage is regulated to y2 by the generator regulator, wherein y2 ═ f (x)₂)-k1×T。

Wherein, f (x)₁) Is equal to the first temperature threshold value x₁Corresponding predetermined voltage value, f (x)₂) Is equal to the second temperature threshold value x₂And k1 is a generator temperature compensation coefficient, and T is the temperature of the automobile generator.

Wherein the method further comprises the steps of:

and S301, acquiring voltage information of the whole vehicle.

Specifically, the information detection element includes a third information detection element, and the voltage information of the entire vehicle is acquired by the third information detection element.

And S302, controlling the generator to operate according to the whole vehicle voltage information and a preset voltage threshold, wherein if the whole vehicle voltage is smaller than the preset voltage threshold, the limit of the excitation current of the generator is removed.

Specifically, the preset voltage threshold is preferably but not limited to 9.75V, in the step, when the voltage of the whole vehicle is less than 9.75V, the limit of the excitation current of the generator is removed through the generator regulator, the duty ratio is forcibly increased to 100%, the voltage of the whole vehicle is increased to a normal level, and the low-voltage protection function of the generator is realized.

Example two

An embodiment of the present invention provides a generator control system, and fig. 2 is a schematic structural diagram of the generator control system according to the second embodiment, referring to fig. 2, the system includes:

the information detection element 1 is used for acquiring charge and discharge information of an automobile storage battery and duty ratio information of a generator;

the control unit 2 is used for controlling the operation of the automobile generator according to the charging and discharging information and the duty ratio information;

the control unit 2 comprises an engine controller 21 and a generator regulator 22, wherein if the automobile storage battery is in a discharging state and the duty ratio of the generator is greater than a preset proportional threshold, the engine controller 21 generates a first control instruction, and the generator regulator 22 releases the limit of the excitation current of the generator according to the first control instruction.

The information detection element 1 is also used for acquiring generator temperature information; the generator regulator 22 is also used for regulating the voltage of the automobile generator according to the comparison result of the generator temperature and a preset temperature threshold; the preset temperature threshold at least comprises a first temperature threshold and a second temperature threshold, and the first temperature threshold is smaller than the second temperature threshold; when the generator temperature is greater than the first temperature threshold and less than the second temperature threshold, the generator regulator 22 regulates the vehicle generator voltage to y1, where y1 ═ f (x) is₁) -k1 × T; when the generator temperature is greater than the second temperature threshold, the generator regulator 22 regulates the vehicle generator voltage to y2, where y2 ═ f (x)₂) -k1 × T; wherein, f (x)₁) Is equal to the first temperature threshold value x₁Corresponding predetermined voltage value, f (x)₂) Is equal to the second temperature threshold value x₂And k1 is a generator temperature compensation coefficient, and T is the temperature of the automobile generator.

The information detection element is also used for acquiring voltage information of the whole vehicle; the generator regulator 22 is further configured to control the generator to operate according to the vehicle voltage information and a preset voltage threshold, wherein if the vehicle voltage is less than the preset voltage threshold, the limit of the generator exciting current is removed.

Wherein the engine controller 21 is adapted to determine the formula if the vehicle battery is in a discharged stateCalculating voltage regulation value U of generator_setWhere K is the voltage compensation coefficient, U_altFor generator voltage in the discharged state of the accumulator, U_batThe voltage is the battery voltage of the storage battery in a discharging state, and R is the resistance of the automobile power supply loop; the generator regulator 22 is operable to set the generator voltage to and to set the generator voltage to the generator voltage regulation value.

It should be noted that the system according to the second embodiment of the present invention corresponds to the method according to the first embodiment, and therefore, portions that are not described in detail in the second embodiment can be obtained by referring to a portion of the first embodiment, which is not described herein again.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.