CN110296066A - The control system of water pump and method of electric car - Google Patents
The control system of water pump and method of electric car Download PDFInfo
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- CN110296066A CN110296066A CN201910520976.4A CN201910520976A CN110296066A CN 110296066 A CN110296066 A CN 110296066A CN 201910520976 A CN201910520976 A CN 201910520976A CN 110296066 A CN110296066 A CN 110296066A
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- water pump
- motor
- revolving speed
- water
- gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0209—Rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2207/00—External parameters
- F04B2207/03—External temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention discloses a kind of control system of water pump of electric car and method, the system comprises multiple temperature sensing units, the water temperature being respectively used in acquisition water pump and at least one by the cooling component of the water supply of water pump temperature；Automobile control unit, for setting multiple water pump gears, wherein different water pump gears corresponds to the different rotating speeds of pump motor；Obtain the temperature of the water temperature in water pump and at least one cooling component that supplied water by water pump；Corresponding water pump gear is determined according to the water temperature in the water pump, and corresponding water pump gear is determined according to the temperature of at least one cooling component that supplied water by water pump respectively；In multiple determined water pump gears, the corresponding highest gear of pump motor revolving speed is selected to control the revolving speed of the pump motor.The present invention reduces the water pump speed change frequency, by dividing water pump gear to meet NVH demand.The present invention can be widely applied to electric car field.
Description
Technical field
The present invention relates to electric car field, the control system of water pump and method of especially a kind of electric car.
Background technique
Current electric car uses motor to replace engine, is travelled by motor driven vehicle.In normally travel
During, motor is in acting state, and self-heating amount is larger, and heating is than very fast, and excessively high temperature can reduce electricity significantly
The service life of machine.Therefore it needs to carry out thermal balance and cooling for electric motor loop.For the scheme of this kind of heat managements, industry is usual
Radiating control is carried out using the water pump of adjustable speed PWM (pulse width modulation).
And since water pump is stepless speed regulation, in control process, water pump is easy busy shift, and during speed change
Generate biggish noise, be not able to satisfy electric car NVH (abbreviation of Noise, Vibration, Harshness, i.e. noise,
Vibration and sound vibration roughness) it requires.
Summary of the invention
In order to solve the above technical problems, it is an object of the invention to: provide a kind of electric car control system of water pump and
Method, to reduce the frequency of water pump speed change, to meet the NVH demand of electric car.
The first aspect of the embodiment of the present invention provides:
A kind of control system of water pump of electric car, comprising:
Multiple temperature sensing units, the water temperature being respectively used in acquisition water pump and at least one is cooling by the water supply of water pump
Component temperature；
Automobile control unit, for setting multiple water pump gears, wherein different water pump gears correspond to pump motor not
Same revolving speed；Obtain the temperature of the water temperature in water pump and at least one cooling component that supplied water by water pump；According in the water pump
Water temperature determine corresponding water pump gear, determined respectively pair according to the temperature of at least one cooling component that supplied water by water pump
The water pump gear answered；In multiple determined water pump gears, select the corresponding highest gear of pump motor revolving speed to control
State the revolving speed of pump motor.
Further, further includes:
Pedal sensing unit, for detecting gas pedal aperture；
Motor torque detection unit, the change rate of the torque for detecting motor；
The automobile control unit is also used to obtain the aperture of gas pedal from pedal sensing unit, is determining that throttle steps on
After the aperture of plate is greater than the first given threshold, the change rate of the torque of motor is obtained, and then in the variation for the torque for determining motor
After rate is greater than the second given threshold, in multiple water pump gears of setting, the highest shelves of the revolving speed of corresponding pump motor are selected
Position controls the revolving speed of the pump motor.
Further, the revolving speed of the control pump motor, specifically:
The duty ratio for controlling the pwm signal of the revolving speed of the pump motor is controlled, to control the pump motor
Revolving speed；Wherein, during switching water pump gear, the duty ratio of pwm signal is gradually changed.
It is further, described to gradually change the duty ratio of pwm signal during switching water pump gear, specifically:
During switching water pump gear, change the duty ratio of pwm signal with the first pace of change.
Further, described in multiple water pump gears of setting, select the highest gear of the revolving speed of corresponding pump motor
Control the revolving speed of the pump motor, specifically:
Increase the revolving speed of duty ratio corresponding pump motor into all water pump gears of pwm signal with the second pace of change
Duty ratio corresponding to highest gear；Wherein, the second pace of change is greater than the first pace of change.
Further, the automobile control unit, will after the change rate for the torque for determining motor is less than third given threshold
The revolving speed of motor reverts to be corresponded to corresponding to the highest gear of pump motor revolving speed in the multiple determined water pump gear
Revolving speed.
The second aspect of the embodiment of the present invention provides:
A kind of water pump control method of electric car, comprising the following steps:
Set multiple water pump gears, wherein different water pump gears corresponds to the different rotating speeds of pump motor；
Obtain the temperature of the water temperature in water pump and at least one cooling component that supplied water by water pump；
Determine corresponding water pump gear according to the water temperature in the water pump, according to it is described at least one by water pump supply water cool down
The temperature of component determine corresponding water pump gear respectively；
In multiple determined water pump gears, the corresponding highest gear of pump motor revolving speed is selected to control the water pump
The revolving speed of motor.
Further, further comprising the steps of:
Obtain the aperture of gas pedal；
After the aperture for determining gas pedal is greater than the first given threshold, the change rate of the torque of motor, Jin Er are obtained
After determining that the change rate of the torque of motor is greater than the second given threshold, in multiple water pump gears of setting, corresponding water is selected
The highest gear of the revolving speed of pump motor controls the revolving speed of the pump motor.
Further, the revolving speed of the control pump motor, specifically:
The duty ratio for controlling the pwm signal of the revolving speed of the pump motor is controlled, to control the pump motor
Revolving speed；Wherein, during switching water pump gear, the duty ratio of pwm signal is gradually changed.
It is further, described to gradually change the duty ratio of pwm signal during switching water pump gear, specifically:
During switching water pump gear, change the duty ratio of pwm signal with the first pace of change.
Further, described in multiple water pump gears of setting, select the highest gear of the revolving speed of corresponding pump motor
Control the revolving speed of the pump motor, specifically:
Increase the revolving speed of duty ratio corresponding pump motor into all water pump gears of pwm signal with the second pace of change
Duty ratio corresponding to highest gear；Wherein, the second pace of change is greater than the first pace of change.
Further, further comprising the steps of:
After the change rate for the torque for determining motor is less than third given threshold, the revolving speed of motor is reverted to the multiple
Revolving speed corresponding to the highest gear of pump motor revolving speed is corresponded in determined water pump gear.
The beneficial effects of the present invention are: the present invention determines correspondence by dividing water pump gear, and according to the water temperature in water pump
Water pump gear, and the temperature for the cooling component that supplied water by water pump according at least one determines corresponding water pump gear respectively；
Then in multiple determined water pump gears, the corresponding highest gear of pump motor revolving speed is selected to control the pump motor
Revolving speed, to reduce the water pump speed change frequency, to meet the requirement of electric car NVH.
Detailed description of the invention
Fig. 1 is a kind of module frame chart of the control system of water pump of the electric car of specific embodiment of the present invention；
Fig. 2 is the first variation of water pump gear duty ratio of PWM wave in handoff procedure in the specific embodiment of the invention
Curve；
Fig. 3 is second of variation of water pump gear duty ratio of PWM wave in handoff procedure in the specific embodiment of the invention
Curve；
Fig. 4 is a kind of flow chart of the water pump control method of the electric car of specific embodiment of the present invention.
Specific embodiment
The present invention is further detailed with specific embodiment with reference to the accompanying drawings of the specification.
Referring to Fig.1, present embodiment discloses a kind of control system of water pump of electric car, the water pump is used for heat-dissipating pipe
Road is pumped to cool down the electric-vehicle part of motor, electric machine controller or other needs coolings.
The control system of water pump of the present embodiment includes multiple temperature sensing units and automobile control unit.The multiple temperature
Can be communicated by multiple communication interface between sensing unit and automobile control unit, as CAN bus, I2C bus or
The data-interfaces such as serial ports.
Multiple temperature sensing units, the water temperature being respectively used in acquisition water pump and multiple portions cooling by the water supply of water pump
The temperature of part.
Specifically, multiple temperature sensing units can be different types of temperature sensor, including but not limited to temperature-sensitive electricity
The temperature sensor of resistance, thermocouple or other integrated forms, the temperature sensing unit includes the core device for detecting temperature
Part, and temperature transition that the core devices are acquired are the peripheral circuit of output signal.The multiple temperature sensing unit
In include water temperature sensing unit for acquiring water temperature in water pump and multiple supplied water the component of cooling for acquire by water pump
The sensing unit of temperature, the component cooling by the water supply of water pump includes the components such as motor and electric machine controller, also be can wrap
Include the components such as battery.Wherein, each temperature sensing unit acquires the temperature of a component, for example, in the present embodiment including three
A temperature sensing unit, is respectively water temperature sensing unit, electric machine controller temperature sensing unit and motor temperature sensing unit,
Water temperature sensing unit acquires the water temperature in water pump, and electric machine controller temperature sensing unit acquires the temperature of electric machine controller, motor
The temperature of temperature sensing unit acquisition motor.
Automobile control unit, for setting multiple water pump gears, wherein different water pump gears correspond to pump motor not
Same revolving speed；Obtain the temperature of the water temperature in water pump and at least one cooling component that supplied water by water pump；According in the water pump
Water temperature determine corresponding water pump gear, determined respectively pair according to the temperature of at least one cooling component that supplied water by water pump
The water pump gear answered；In multiple determined water pump gears, select the corresponding highest gear of pump motor revolving speed to control
State the revolving speed of pump motor.
Specifically, the automobile control unit is also referred to as VCU (abbreviation of Vehicle Control Unit).In this reality
It applies in example, water pump gear is divided into N number of, and the N can be 3,5 or 7 etc..And for each temperature sensing unit, it adopts
Collection temperature is each divided into several sections, and the quantity in section that is divided into of each temperature sensing unit can be it is identical
Or be different.And the divided each section of temperature sensing unit corresponds to a water pump gear.
And the control signal of the corresponding pump motor of each water pump gear, the control signal can be voltage signal or
Person's current signal, the control signal can be the control signal of pwm signal, sine wave signal or other waveforms.
In the present embodiment, it is illustrated using controlling signal as pwm signal, water pump gear is divided into three, i.e., first
Shelves, second gear and third gear.The size of the height of water pump gear and the duty ratio of pwm signal corresponding to water pump gear is positive
It closes, i.e. the duty ratio of the more high corresponding pwm signal of gear is bigger.
And the temperature collection of each temperature sensing unit is each divided into three temperature ranges, for example, first temperature passes
Sense unit is divided into tri- temperature ranges of T10~T11, T11~T12 and T12~T13；Second temperature sensing unit quilt
It is divided into tri- temperature ranges of T20~T21, T21~T22 and T22~T23；Third temperature sensing unit is divided into T30
~T31, T31~T32 and T32~T33.Table 1 is the temperature collection and water pump shelves of three temperature sensing units in the present embodiment
The mapping table of position.
Table 1
Since each heat dissipation capacity for needing cooling component is different, while the water temperature pair in the temperature and water pump of component
Influence caused by system is cooling is different, therefore the temperature range that each temperature sensing unit is divided under normal circumstances
It is different.For example, its heat dissipation capacity is bigger than electric machine controller for motor, therefore, both parts are reduced into 1 DEG C of institute
The water flow needed is different.Therefore, in comparison, motor may just be needed in lower temperature for motor and electric machine controller
Use biggish water flow.
The water temperature according in the water pump determines corresponding water pump gear, according to it is described at least one supplied water by water pump
The temperature of cooling component determines corresponding water pump gear respectively, specifically refers to, and is acquired according to each temperature sensing unit
Temperature, and the corresponding water pump shelves of each temperature sensing unit temperature collected are determined by the relation table as table 1
Position.
It is exemplified by Table 1, it is assumed that the first temperature sensing unit temperature T1 collected belongs to T11~T12, can determine first
The corresponding water pump gear of temperature sensing unit temperature T1 collected is second gear；It is assumed that second temperature sensing unit is collected
Temperature T2 belongs to T22~T23, can determine that the corresponding water pump gear of second temperature sensing unit temperature T2 collected is third
Shelves；It is assumed that third temperature sensing unit temperature T3 collected belongs to T30~T31, third temperature sensing unit institute can be determined
The corresponding water pump gear of the temperature T3 of acquisition is first grade.
It can so determine that third gear is that above-mentioned determined multiple water pump gear middle gears are highest in the present embodiment
One.The present embodiment generates pwm signal according to the corresponding duty ratio of the third gear of water pump gear, that is, generates 70% duty
The pwm signal of ratio.
And in further embodiments, water pump gear can be divided finer, while can be by different temperature
Sensing unit marks off the different temperature range of quantity.For example, water pump gear is divided into 5 gears, A grades, B grades, C grades, D grades
With E grades.In the present embodiment, the temperature range of the first temperature sensing unit is divided into T10~T11, and T11~T1A, T1A~
Tetra- temperature ranges of T12 and T12~T13.The temperature range of second temperature sensing unit is divided into T20~T21, and T21~
Five temperature ranges of T2A, T2A~T22, T22~T2B and T2B~T23.The temperature range of third temperature sensing unit is divided
For tri- temperature ranges of T30~T31, T31~T32 and T32~T33.In the present embodiment, the acquisition of three temperature sensing units
Temperature and the corresponding relationship of water pump gear are as shown in table 2.
Table 2
Second gear from the corresponding relationship in Tables 1 and 2 it is found that A shelves in first grade of corresponding table 2 in table 1, in table 1
The C shelves in table 1 are corresponded to, the third gear in table 1 corresponds to the E shelves in table 2.And in the present embodiment, it marks off B grades and D grades more, makes
The control for obtaining water pump can be more fine, to save the electric energy of electric car.
For example, when the first temperature sensing unit temperature T1 collected belongs to T10~T11, i.e. corresponding A shelves；Second temperature
Sensing unit temperature T2 collected belongs to T22~T2B, that is, corresponds to D grades；Third temperature sensing unit temperature T3 collected belongs to
In T31~T32, that is, correspond to C grades.So according to the corresponding relationship in table 2, can determine makes the highest gear of pump motor revolving speed
It is D grades, at this point, the duty ratio of the pwm signal of control water pump is 60%.But if using table 1 corresponding relationship, second temperature
Spending the corresponding water pump gear of sensing unit temperature collected should be third gear, at this point, the duty ratio of the pwm signal of control water pump
It is 70%, the pwm signal for being equivalent to control water pump has more 10% duty ratio, therefore more using energy consumption when the corresponding relationship of table 1
Greatly.
Generally speaking, water pump gear is divided more fine more is conducive to save the electricity of electric car, but with electricity
While amount is saved, the increase of the water pump speed change frequency will lead to, it is unfavorable to the NVH of electric car.And water pump gear is divided more
Few, more unfavorable for saving electricity, but it divides fewer, the frequency of water pump speed change is lower, more to the NVH of electric car
Added with benefit.
And in the speed-change process of water pump, the present embodiment is realized by way of adjusting pwm signal duty ratio.General feelings
Under condition, if the duty ratio of pwm signal jumps, such as suddenly becomes 70% from 30%, pump rotary speed can be made to be mutated, thus
Generate biggish noise.The present embodiment is in order to alleviate this problem, when the duty ratio of pwm signal will change, using gradually
The mode of variation adjusts the duty ratio of pwm signal.The mode gradually changed can there are many, for example, can using perseverance
Speed increase and decrease or speed change increase and decrease.Fig. 2 shows the first gear shift mode, the change in duty cycle speed of pwm signal be it is constant, because
This duty ratio and time are in line.And Fig. 3 shows second of gear shift mode, the change in duty cycle speed of pwm signal is not
It is constant, start to change as rapidly, behind change slowly, therefore the function of duty ratio and time are at a camber line.
Wherein, the change in duty cycle of pwm signal is arranged by software, carries out signal through wave filter after pwm signal output
The filter function that Fig. 2 or Fig. 3 etc. can be used, the smooth transition of Lai Shixian gear is arranged in filtering, filtering parameter.
As preferred embodiment, the multiple temperature sensing unit includes:
Water temperature sensing unit, for acquiring the water temperature in water pump；
Electric machine controller temperature sensing unit, for acquiring the temperature of electric machine controller；
Motor temperature sensing unit, for acquiring the temperature of motor.
Water temperature, motor and electric machine controller in water pump influence maximum to the control strategy of control system of water pump, therefore
The present embodiment limiting temperature sensing unit is that water temperature sensing unit, electric machine controller temperature sensing unit and motor temperature sensing are single
Member.Wherein, the water temperature sensing unit may include several temperature sensors, if water temperature sensing unit temperature collected is
The average value of dry temperature sensor acquisition data, for example, temperature sensing can be respectively provided in the inlet and outlet of water pump
Device acquires water temperature, then using the average value of the two temperature sensors temperature collected as the output of water temperature sensing unit
Value.Similarly, electric machine controller temperature sensing unit and motor temperature sensing unit also may include several temperature sensors.This
The setting position of a little temperature sensors according to the actual situation depending on, some temperature sensors are mounted motor or electric machine controller
Surface, some temperature sensors are integrated in inside motor or electric machine controller.
As preferred embodiment, the water temperature according in the water pump determines corresponding water pump gear, according to described
The temperature of at least one cooling component that supplied water by water pump determines corresponding water pump gear respectively, specifically includes:
Obtain the temperature collection of each temperature sensing unit and the corresponding relationship of water pump gear；
According to the corresponding relationship of each temperature sensing unit temperature collected and temperature collection and water pump gear, determine
The corresponding water pump gear of each temperature sensing unit temperature collected out.
Specifically, the temperature collection that the present embodiment obtains each temperature sensing unit first controls the corresponding of gear with water temperature
Relationship, for example, obtaining the tables of data as table 1 or table 2.Certain tables of data is a kind of data mode, in other implementations
In example, other data formats are can be used to express in the corresponding relationship.Then collected according to each temperature sensing unit
Temperature determines the corresponding water pump gear of each temperature sensing unit temperature collected, i.e. how many temperature sensing list
Member, it is determined that how many a water pump gears out.Certainly, the quantity of water pump gear is pre-set, i.e., multiple water pump gears
Between height relationship have determined, therefore gear highest one can be confirmed from the water pump gear being determined
It is a, duty ratio required for the pwm signal to determine control water pump.In the present embodiment, the height and water pump of water pump gear
The size of the duty ratio of pwm signal corresponding to gear is positively related, that is to say, that water pump gear is higher, corresponding PWM
The duty ratio of signal is bigger.
However, often will appear the ramp case of burst in the practical application of electric car, for example, driver is unexpected
Anxious to accelerate, motor generates huge change in torque, at this point, motor and electric machine controller may generate greatly within a short period of time
Calorimetric energy.If can not radiate in time, automobile component accelerated ageing even failure will lead to.Therefore, referring to Fig.1, as
Preferred embodiment, the present embodiment further include: pedal sensing unit and Motor torque detection unit.
Wherein, pedal sensing unit, for detecting gas pedal aperture.Driver if necessary to accelerate, step on by needs
Gas pedal, and step on deeper, accelerate faster.Therefore whether by the aperture of detection gas pedal, can detecte may deposit
In the behavior suddenly accelerated.
Motor torque detection unit, the change rate of the torque for detecting motor.The torque of motor is the common inspection of motor
Parameter is surveyed, can be exported by motor itself or calculates to obtain by electric machine controller.Therefore the Motor torque detection unit
It may be arranged on motor or be arranged on electric machine controller.
The automobile control unit is also used to obtain the aperture of gas pedal from pedal sensing unit, is determining that throttle steps on
After the aperture of plate is greater than the first given threshold, the change rate of the torque of motor is obtained, and then in the variation for the torque for determining motor
After rate is greater than the second given threshold, in multiple water pump gears of setting, the highest shelves of the revolving speed of corresponding pump motor are selected
Position controls the revolving speed of the pump motor, i.e., adjusts pwm signal to the maximum duty cycle of setting.
Specifically, the sufficiently large torque gradient for being not meant to motor of the aperture of gas pedal also can be very big.Therefore, originally
Whether the aperture that embodiment detects gas pedal first meets threshold condition, after determining that it meets threshold condition, then detects electricity
The torque gradient of machine, to further confirm that whether adjust pump motor to the maximum speed of setting.
Wherein, the maximum duty cycle of setting refers to the maximum duty of the pwm signal by the control pump motor of default
Than.For example, 99% can be set by the maximum duty cycle of setting, or it is arranged to 95%.It in the present embodiment, can also be
Pwm signal is adjusted and regards as to the maximum duty cycle of setting and adjusts water pump to a special water pump gear, even if motor
Reach the gear of the maximum (top) speed of system permission.Therefore, during in preceding embodiment about gear switch, PWM is gradually changed
The embodiment of the duty ratio of signal is also applied for the present embodiment.
The revolving speed of pump motor is adjusted the maximum being arranged to system after detecting anxious acceleration behavior by the present embodiment in time
Speed guarantees that heat-radiation loop can set up rapidly flow, meets the radiating requirements of critical component under adverse circumstances.
Although the maximum duty cycle that the duty ratio of pwm signal is adjusted to setting can satisfy such as motor critical component
Urgent radiating requirements, but if the duty ratio of pwm signal is adjusted so as to not enough rapidly, may be caused not in time due to heat dissipation
Component life is lost.
Therefore, as preferred embodiment, the present embodiment is in the maximum duty that the duty ratio of pwm signal is increased to setting
Than when, the duty ratio of pwm signal is adjusted using faster pace of change.
In the present embodiment, described to gradually change the duty ratio of pwm signal during switching water pump gear, tool
Body are as follows:
During switching water pump gear, change the duty ratio of pwm signal with the first pace of change；
It is described in multiple water pump gears of setting, select the highest gear of the revolving speed of corresponding pump motor to control
The revolving speed of pump motor is stated, specifically:
Increase the revolving speed of duty ratio corresponding pump motor into all water pump gears of pwm signal with the second pace of change
Duty ratio corresponding to highest gear；Wherein, the second pace of change is greater than the first pace of change.
Specifically, the duty ratio of pwm signal is being adjusted to corresponding pump motor in all water pump gears by the present embodiment
The highest gear of revolving speed corresponding to duty ratio set during duty ratio (i.e. system allow maximum duty cycle)
Pace of change wants high relative to change in duty cycle speed set during common gear switch.The present embodiment is being sacrificed
In the case where certain NVH performance, increase regulating the speed for the duty ratio of pwm signal as far as possible, promptly obtain radiating requirements to meet,
To extend the service life of such as motor critical component.
Certainly, best heat dissipation effect can be brought by so that water pump is worked under maximum speed, can also make water pump at the same time
In maximum power consumption.Therefore, it is necessary in due course lower the revolving speed of water pump.
It is further comprising the steps of as preferred embodiment: change of the automobile control unit in the torque for determining motor
After rate is less than third given threshold, the revolving speed of motor is reverted to and corresponds to water pump electricity in the multiple determined water pump gear
Revolving speed corresponding to the highest gear of machine revolving speed.The duty ratio of pwm signal is reverted into the multiple determined water pump shelves
Duty ratio corresponding to the highest gear of pump motor revolving speed is corresponded in position.
Specifically, after the torque gradient of motor becomes smaller, it can determine that motor has not needed so big flow
It is excessively high to prevent temperature.It therefore, can be to be determined by multiple temperature sensing units temperature collected by water pump gear switch
Make the highest gear of pump motor revolving speed.Therefore, the present embodiment can be in the speed of downward of suitable opportunity water pump, thus full
The urgent heat dissipation of foot reduces the power consumption of water pump while needs.
Certainly, in order to guarantee it is anxious accelerate institute fully to be taken away with the heat of generation, can be in the torque for determining motor
After change rate is less than third given threshold, then one section of setting time is waited, then by water pump gear switch is common gear.
Referring to Fig. 4, a kind of water pump control method of electric car of the present embodiment, comprising the following steps:
S401, the multiple water pump gears of setting, wherein different water pump gears corresponds to the different rotating speeds of pump motor；
The temperature of S402, the water temperature in acquisition water pump and at least one cooling component that supplied water by water pump；
S403, corresponding water pump gear is determined according to the water temperature in the water pump, according to it is described at least one supplied by water pump
The temperature of the cooling component of water determines corresponding water pump gear respectively；
S404, in multiple determined water pump gears, select the corresponding highest gear of pump motor revolving speed to control
State the revolving speed of pump motor.
As preferred embodiment, the revolving speed of the control pump motor, specifically:
The duty ratio for controlling the pwm signal of the revolving speed of the pump motor is controlled, to control the pump motor
Revolving speed；Wherein, during switching water pump gear, the duty ratio of pwm signal is gradually changed.
It is described to gradually change the duty ratio of pwm signal during switching water pump gear as preferred embodiment,
Its specifically:
During switching water pump gear, change the duty ratio of pwm signal with the first pace of change；
It is described in multiple water pump gears of setting, select the highest gear of the revolving speed of corresponding pump motor to control
The revolving speed of pump motor is stated, specifically:
Increase the revolving speed of duty ratio corresponding pump motor into all water pump gears of pwm signal with the second pace of change
Duty ratio corresponding to highest gear；Wherein, the second pace of change is greater than the first pace of change.
It is further comprising the steps of as preferred embodiment:
Obtain the aperture of gas pedal；
After the aperture for determining gas pedal is greater than the first given threshold, the change rate of the torque of motor, Jin Er are obtained
After determining that the change rate of the torque of motor is greater than the second given threshold, in multiple water pump gears of setting, corresponding water is selected
The highest gear of the revolving speed of pump motor controls the revolving speed of the pump motor.
It is further comprising the steps of as preferred embodiment:
After the change rate for the torque for determining motor is less than third given threshold, the revolving speed of motor is reverted to the multiple
Revolving speed corresponding to the highest gear of pump motor revolving speed is corresponded in determined water pump gear.
Under the premise of not generating contradictory, technology corresponding or identical with system embodiment in above method embodiment
Technical effect caused by feature is identical, is also suitable identical implementation means.
For the step number in above method embodiment, it is arranged only for the purposes of illustrating explanation, between step
Sequence do not do any restriction, the execution of each step in embodiment sequence can according to the understanding of those skilled in the art come into
Row is adaptively adjusted.
It is to be illustrated to preferable implementation of the invention, but the present invention is not limited to the embodiment above, it is ripe
Various equivalent deformation or replacement can also be made on the premise of without prejudice to spirit of the invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all included in the scope defined by the claims of the present application a bit.
Claims (10)
1. a kind of control system of water pump of electric car, it is characterised in that: include:
Multiple temperature sensing units, the water temperature being respectively used in acquisition water pump and at least one portion cooling by the water supply of water pump
The temperature of part；
Automobile control unit, for setting multiple water pump gears, wherein the difference that different water pump gears corresponds to pump motor turns
Speed；Obtain the temperature of the water temperature in water pump and at least one cooling component that supplied water by water pump；According to the water in the water pump
Temperature determines corresponding water pump gear, is determined respectively according to the temperature of at least one cooling component that supplied water by water pump corresponding
Water pump gear；In multiple determined water pump gears, the corresponding highest gear of pump motor revolving speed is selected to control the water
The revolving speed of pump motor.
2. a kind of control system of water pump of electric car according to claim 1, it is characterised in that: further include:
Pedal sensing unit, for detecting gas pedal aperture；
Motor torque detection unit, the change rate of the torque for detecting motor；
The automobile control unit is also used to obtain the aperture of gas pedal from pedal sensing unit, is determining gas pedal
After aperture is greater than the first given threshold, the change rate of the torque of motor is obtained, and then big in the change rate for the torque for determining motor
After the second given threshold, in multiple water pump gears of setting, the highest gear of the revolving speed of corresponding pump motor is selected
Control the revolving speed of the pump motor.
3. a kind of control system of water pump of electric car according to claim 1 or 2, it is characterised in that: the control institute
The revolving speed of pump motor is stated, specifically:
The duty ratio for controlling the pwm signal of the revolving speed of the pump motor is controlled, to control the revolving speed of the pump motor；
Wherein, during switching water pump gear, the duty ratio of pwm signal is gradually changed.
4. a kind of control system of water pump of electric car according to claim 3, it is characterised in that: described in switching water pump
During gear, the duty ratio of pwm signal is gradually changed, specifically:
During switching water pump gear, change the duty ratio of pwm signal with the first pace of change；
It is described in multiple water pump gears of setting, select the highest gear of the revolving speed of corresponding pump motor to control the water
The revolving speed of pump motor, specifically:
Increase the revolving speed highest of duty ratio corresponding pump motor into all water pump gears of pwm signal with the second pace of change
Gear corresponding to duty ratio；Wherein, the second pace of change is greater than the first pace of change.
5. a kind of control system of water pump of electric car according to claim 2, it is characterised in that: the automobile control is single
The revolving speed of motor is reverted to the multiple be determined after the change rate for the torque for determining motor is less than third given threshold by member
Water pump gear in correspond to revolving speed corresponding to the highest gear of pump motor revolving speed.
6. a kind of water pump control method of electric car, it is characterised in that: the following steps are included:
Set multiple water pump gears, wherein different water pump gears corresponds to the different rotating speeds of pump motor；
Obtain the temperature of the water temperature in water pump and at least one cooling component that supplied water by water pump；
Corresponding water pump gear is determined according to the water temperature in the water pump, according at least one described cooling portion that supplied water by water pump
The temperature of part determines corresponding water pump gear respectively；
In multiple determined water pump gears, the corresponding highest gear of pump motor revolving speed is selected to control the pump motor
Revolving speed.
7. a kind of water pump control method of electric car according to claim 6, it is characterised in that: further include following step
It is rapid:
Obtain the aperture of gas pedal；
After the aperture for determining gas pedal is greater than the first given threshold, the change rate of the torque of motor is obtained, and then in determination
After the change rate of the torque of motor is greater than the second given threshold, in multiple water pump gears of setting, corresponding water pump electricity is selected
The highest gear of the revolving speed of machine controls the revolving speed of the pump motor.
8. a kind of water pump control method of electric car according to claim 6 or 7, it is characterised in that: the control institute
The revolving speed of pump motor is stated, specifically:
The duty ratio for controlling the pwm signal of the revolving speed of the pump motor is controlled, to control the revolving speed of the pump motor；
Wherein, during switching water pump gear, the duty ratio of pwm signal is gradually changed.
9. a kind of water pump control method of electric car according to claim 8, it is characterised in that: described in switching water pump
During gear, the duty ratio of pwm signal is gradually changed, specifically:
During switching water pump gear, change the duty ratio of pwm signal with the first pace of change；
It is described in multiple water pump gears of setting, select the highest gear of the revolving speed of corresponding pump motor to control the water
The revolving speed of pump motor, specifically:
Increase the revolving speed highest of duty ratio corresponding pump motor into all water pump gears of pwm signal with the second pace of change
Gear corresponding to duty ratio；Wherein, the second pace of change is greater than the first pace of change.
10. a kind of water pump control method of electric car according to claim 7, it is characterised in that: further include following step
It is rapid:
After the change rate for the torque for determining motor is less than third given threshold, the revolving speed of motor is reverted to the multiple true
Revolving speed corresponding to the highest gear of pump motor revolving speed is corresponded in fixed water pump gear.
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| CN112693362A (en) * | 2020-12-21 | 2021-04-23 | 奇瑞汽车股份有限公司 | Cooling management system of vehicle-mounted electric pile and vehicle with cooling management system |
| CN116163942A (en) * | 2023-02-08 | 2023-05-26 | 阿尔特汽车技术股份有限公司 | Control method and device for electric oil pump of electric automobile oil-cooled power assembly |
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Application publication date: 20191001 |