CN112483426A - Control method, oil pump and control system - Google Patents
Control method, oil pump and control system Download PDFInfo
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- CN112483426A CN112483426A CN201910865663.2A CN201910865663A CN112483426A CN 112483426 A CN112483426 A CN 112483426A CN 201910865663 A CN201910865663 A CN 201910865663A CN 112483426 A CN112483426 A CN 112483426A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
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Abstract
A control method, an oil pump and a control system are provided, wherein the oil pump comprises a driving device and a pump rotor, and the driving device can drive the pump rotor to rotate; if the current temperature of the working medium is in a first temperature interval, the control system controls the oil pump to operate according to a first set of control parameters; if the current temperature of the working medium is in a second temperature interval, the control system controls the oil pump to operate according to a second set of control parameters; the control system controls the rotating speed change rate of the oil pump in operation according to the first set of control parameters to be larger than the rotating speed change rate of the control system in operation according to the second set of parameters; thus, the oil pump can be reliably operated by selecting different control parameters according to different temperatures.
Description
Technical Field
The invention relates to the technical field of pump control.
Background
The oil pump is provided with a driving device and a pump rotor, the driving device can drive the pump rotor to rotate, and the oil pump mainly utilizes the rotation of the pump rotor to convey working media from the pump inlet to the pump outlet; generally, the viscosity of the working medium varies with the temperature, and when the viscosity of the working medium varies, the operating state of the pump varies, so how to control the oil pump to operate reliably is a problem to be considered in the design process.
Disclosure of Invention
The invention aims to provide a control method, an oil pump and a control system, so that the oil pump can be reliably operated.
In order to achieve the above purpose, one embodiment of the present invention adopts the following technical solutions:
a control method for controlling an oil pump, the oil pump including a drive device and a pump rotor, the drive device being capable of driving the pump rotor to rotate; defining a first temperature interval, wherein the current temperature of the working medium is greater than or equal to a preset first temperature in the first temperature interval; defining a second temperature interval, wherein in the second temperature interval, the current temperature of the working medium is less than the preset first temperature and is greater than or equal to the preset second temperature; the control method comprises the following steps:
acquiring the current temperature of the working medium;
acquiring a control parameter corresponding to the current temperature of the working medium;
if the current temperature of the working medium is in the first temperature interval, the control system controls the oil pump to operate according to a first set of control parameters;
if the current temperature of the working medium is in the second temperature interval, the control system controls the oil pump to operate according to a second set of control parameters;
the first set of control parameters and the second set of control parameters comprise a set value of a rotating speed change rate, the larger the set value of the rotating speed change rate is, the faster the rotating speed change is, and the rotating speed change rate of the control system when the control system controls the oil pump to operate by using the first set of control parameters is larger than the rotating speed change rate of the control system when the control system controls the oil pump to operate by using the second set of parameters.
An oil pump, comprising a drive device and a pump rotor, the drive device being capable of driving the pump rotor to rotate; the oil pump further comprises a processor, the processor is electrically connected or in signal connection with the driving device, and the processor can receive and execute program instructions so as to enable the driving device to operate, and further the control method is realized.
A control system for controlling an oil pump, the control system comprising:
a temperature detection unit for detecting a current temperature of the working medium;
the first control unit is used for acquiring a rotating speed control parameter at a corresponding temperature to control the rotating speed of the oil pump;
and the second control unit acquires the torque control parameters at the corresponding temperature to control the torque of the oil pump.
In the technical scheme of the control method, when the current temperature of the working medium is in a first temperature interval, the control system controls the oil pump to operate according to a first set of control parameters; when the current temperature of the working medium is in a second temperature interval, the control system controls the oil pump to operate according to a second set of control parameters, and the rotating speed change rate of the control system when controlling the oil pump to operate according to the first set of control parameters is larger than the rotating speed change rate of the control system when controlling the oil pump to operate according to the second set of parameters; the viscosity of the oil is increased along with the reduction of the temperature, so that the viscosity of the oil in a first temperature interval is smaller than that of the oil in a second temperature interval, if the same set of control parameters are adopted in the two temperature intervals, when the viscosity of the oil is increased, the load is increased, the speed is required to be reduced, if the rotating speed of the oil pump is reduced too fast at the moment, the step-out of the driving device can be caused, when the viscosity of the oil is reduced, the load is reduced, the speed can be increased at the moment, and if the rotating speed of the oil pump is increased too fast at the moment, the step-out of the driving device can be caused; therefore, one set of control parameters cannot meet the rotating speed control requirements of the oil pump in the two temperature intervals, and in the control method, the rotating speed change control requirements of the first temperature interval and the second temperature interval can be met by adopting two sets of control parameters, so that the reliable operation of the oil pump is facilitated.
The application also discloses an oil pump is favorable to making the oil pump reliably move.
The application also discloses a control system, is favorable to making the oil pump reliably move.
Drawings
FIG. 1 is a schematic diagram of the connection of an oil pump in the system of the present invention;
FIG. 2 is a schematic view of another connection of the oil pump in the system of the present invention;
FIG. 3 is a schematic diagram of the division of the temperature interval;
FIG. 4 is a schematic control flow chart of the oil pump control method according to the present invention;
FIG. 5 is a control schematic diagram of a first control mode of the oil pump in the present invention;
FIG. 6 is a table illustrating control parameters in the first control scheme of FIG. 5;
FIG. 7 is a control schematic diagram of a second control mode of the oil pump in the present invention;
FIG. 8 is a table illustrating control parameters in the second control scheme of FIG. 7;
FIG. 9 is a schematic diagram of a first embodiment of an oil pump control system according to the present invention;
fig. 10 is a schematic diagram of a second embodiment of the oil pump control system of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples:
referring to fig. 1, fig. 1 is a schematic diagram of a connection of an oil pump in the system according to the present invention; in this embodiment, the oil pump is an electric pump, the oil pump 2 includes a driving device 21 and a pump rotor 22, the driving device 21 can drive the pump rotor 22 to rotate, the driving device 21 here may be a motor, or a combination of a motor and a transmission device, and of course, the driving device may be other devices capable of generating actions; the oil pump system comprises a controller 1 and a sensor 3, the controller 1 is electrically connected with the sensor 3, in this embodiment, the controller 1 and the sensor 3 are not integrated with the oil pump 2, of course, at least one of the controller 1 and the sensor 3 may be integrated with the oil pump 2, the controller 1 is electrically connected with the driving device 21, the controller 1 can control the driving device 21 to operate or stop, and the sensor 3 can detect the temperature of a working medium before entering the oil pump, of course, when the sensor 3 is fixedly connected with the oil pump 2 into a whole, the sensor 3 can also detect the temperature of the working medium in the oil pump at this time.
Referring to fig. 1, the controller 1 includes a memory 11 and a processor 12, the memory 11 stores a computer program that can be run on the processor 12, and the processor 12 can implement the following oil pump control method when executing the computer program, in this embodiment, both the memory 11 and the processor 12 are disposed in the controller 1, but the controller 1 may not include the memory 11, at this time, the memory 11 may be disposed in a main controller of the vehicle, so that the processor 11 is responsible for receiving and executing a program instruction sent by the main controller, and the main controller is an upper computer; in the following, the oil pump is used in a vehicle as an example, and of course, the oil pump may also be used in other occasions, when the oil pump 2 is connected to the vehicle, the controller 1 is in signal connection with a main controller of the vehicle, and the controller 1 can receive a signal of the main controller of the vehicle and feed back information to the main controller.
Referring to fig. 2, fig. 2 is another connection diagram of the oil pump in the system according to the present invention; in this connection, the oil pump 2 'includes a driving device 21', a pump rotor 22 'and a controller 1', the driving device 21 'can drive the pump rotor 22' to rotate, and in this embodiment, the controller 1 'is integrated with the oil pump 2'; for other features of the present embodiment, reference may be made to the above first connection schematic diagram of the oil pump in the system, which is not repeated herein.
The following will describe the control method of the oil pump in detail, and here, the following control method is applied to the oil pump, but the control method may also be applied to other components such as the water pump; for convenience of understanding and description, it is defined herein that the temperature of the working medium before entering the oil pump and the temperature of the working medium entering the oil pump are both the current temperatures of the working medium, and referring to fig. 3, a first temperature interval is defined in which the current temperature of the working medium is equal to or greater than a preset first temperature T1, and a second temperature interval is defined in which the current temperature of the working medium is less than the preset first temperature T1 and equal to or greater than a preset second temperature T2, where the first temperature T1 and the second temperature T2 are both set values within a program; here, the first temperature T1 may be any value of 0 ℃ or higher, the second temperature T2 may be any value of-20 ℃ or lower, and the third temperature T3 may be any value of-15 ℃ or higher than-20 ℃, although the first temperature T1, the second temperature T2 and the third temperature T3 are not limited to the above-mentioned values and may be other values, and other values are within the protection scope of the present invention; referring to fig. 4, the control method includes:
s10, acquiring the current temperature of the working medium;
s20, acquiring a control parameter corresponding to the current temperature of the working medium;
s30, if the current temperature of the working medium is in the first temperature interval, the control system controls the oil pump to operate according to the first set of control parameters; if the current temperature of the working medium is in a second temperature interval, the control system controls the oil pump to operate according to a second set of control parameters;
the first set of control parameters and the second set of control parameters comprise rotating speed change rate set values, the larger the rotating speed change rate set values are, the faster the rotating speed change is, and the rotating speed change rate of the control system when the control system controls the oil pump to operate by using the first set of control parameters is larger than the rotating speed change rate of the control system when the control system controls the oil pump to operate by using the second set of parameters.
The viscosity of the oil is increased along with the reduction of the temperature, so that the viscosity of the oil in a first temperature interval is smaller than that of the oil in a second temperature interval, if the same set of control parameters are adopted in the two temperature intervals, when the viscosity of the oil is changed from low viscosity to high viscosity, the load is increased, the speed is reduced, if the rotating speed of the oil pump is reduced too fast at the moment, the step-out of the driving device can be caused, when the viscosity of the oil is changed from high viscosity to low viscosity, the load is reduced, the speed is increased, and if the rotating speed of the oil pump is increased too fast at the moment, the step-out of the driving device can be caused; therefore, one set of control parameters cannot meet the rotating speed control requirement of the oil pump in the three temperature intervals, and the rotating speed change requirement of the first temperature interval and the rotating speed change requirement of the second temperature interval can be met by adopting two sets of control parameters in the control method, so that the oil pump can reliably run at least in the first temperature interval and the second temperature interval.
In addition, referring to fig. 3, a third temperature interval is defined, in the third temperature interval, the current temperature of the working medium is lower than the second temperature T2, if the current temperature of the working medium is in the third temperature interval, the oil pump stops operating or the control system controls the oil pump to operate according to a third set of control parameters, and when the control system controls the oil pump to operate according to the third set of control parameters, the rate of change of the rotating speed when the control system controls the oil pump to operate according to the third set of control parameters is lower than the rate of change of the rotating speed when the control system controls the oil pump to operate according to the second set of parameters; in the embodiment, when the oil temperature is in the third temperature interval, the oil pump is controlled to operate by a third set of control parameters, so that the oil pump can operate reliably in the third temperature interval; in this embodiment, only three temperature intervals are shown: first temperature interval, second temperature interval and third temperature interval, and every temperature interval corresponds a set of control parameter, of course, for control more meticulous or according to the operating condition of oil pump, also can only divide two temperature intervals or the temperature interval more than three.
Referring to fig. 3, a third temperature T3 is preset in the control program, the third temperature T3 is greater than the second temperature T2 and less than the first temperature T1, and for convenience of understanding and description, a second sub-temperature interval in which the current temperature of the working medium is greater than or equal to the third temperature T3 and less than the first temperature T1 and a second sub-temperature interval in which the current temperature of the working medium is greater than the second temperature T2 and less than the third temperature T3 are defined; defining a target rotating speed corresponding to the control system when the rotating speed of the oil pump is controlled by the control system to operate to the target rotating speed according to a first set of control parameters as a first target rotating speed, wherein when the control system controls the oil pump to operate according to a second set of control parameters, two conditions exist: the first case is: when the current temperature of the working medium is in the second sub-temperature interval, the control system controls the oil pump to operate to a second target rotating speed according to a second set of control parameters, and the second target rotating speed is smaller than the first target rotating speed; when the temperature of the working medium is in a second sub-temperature interval, the control system controls the oil pump to operate to a third target rotating speed according to a second set of control parameters, and the third target rotating speed is smaller than a second target rotating speed; the second case is: and in the second sub-temperature interval and the second sub-temperature interval, the control system controls the oil pumps to operate to the same target rotating speed according to the second set of control parameters, and the corresponding rotating speed is still smaller than the first target rotating speed.
In addition, in the present embodiment, the control method of the oil pump includes two types, and the two control methods of the oil pump and the corresponding control parameters will be described in detail below.
Referring to fig. 5 and 6, fig. 5 is a block diagram of a first control mode of the oil pump, fig. 6 is a table diagram of corresponding control parameters in the first control mode, the rotation speed of the oil pump is controlled in an open-loop manner to reach a target rotation speed, at this time, a first set of control parameters, a second set of control parameters and a third set of control parameters only include the control parameters in the open-loop manner, specifically, referring to fig. 5, in the first control mode, a control system includes a first control unit and a second control unit, the first control unit is used for controlling the speed of the rotation speed change of the oil pump, for example, the change time required when the last target rotation speed of the oil pump needs to be changed into the current target rotation speed is determined by the first control unit, where the target rotation speed of the input amount of the first control unit is a set value in a program, and the specific value thereof is different according to the temperature interval to which the oil temperature belongs to, referring to fig. 5 and 6, the control parameter corresponding to the first control unit is an open-loop operation rotation speed change rate, the rotation speed change rate is faster when the open-loop operation rotation speed change rate set value is larger, and the rotation speed change rate refers to a change relationship of the rotation speed with time, specifically, the open-loop operation rotation speed change rate includes an open-loop operation rotation speed increase change rate and an open-loop operation rotation speed decrease change rate; the second control unit is used for controlling the rotating speed and the torque of the driving device, the control parameter corresponding to the second control unit is an open-loop operation torque change rate, the torque changes faster the larger the open-loop operation torque change rate set value is, the torque change rate refers to the corresponding change rate when the torque changes along with the rotating speed, specifically, when the power is gradually increased, the torque is increased along with the increase of the rotating speed, and when the power of the driving device is a constant value, the torque is decreased along with the increase of the rotating speed.
The control parameters in the first control mode will be described in detail below; referring to fig. 6, the open-loop operation target rotation speed v1 in the first set of control parameters is greater than the open-loop operation target rotation speed v2 in the second set of control parameters is greater than the open-loop operation target rotation speed v3 in the third set of control parameters, in this embodiment, the target rotation speed is a set value in a control program of a main controller in an external system, and at this time, a controller of the oil pump is responsible for receiving a rotation speed command sent by the main controller, and of course, the set value of the target rotation speed may also be stored in the controller of the oil pump; referring to fig. 6 again, the open-loop operation speed increase change rate a1 in the first set of control parameters is greater than the speed increase change rate a2 in the second set of control parameters is greater than the speed increase change rate a3 in the third set of control parameters, the open-loop operation speed decrease change rate b1 in the first set of control parameters is greater than the open-loop operation speed decrease change rate b2 in the second set of control parameters is greater than the open-loop operation speed decrease change rate b3 in the third set of control parameters, so that the speed change of the oil pump in the first temperature interval is greater than the speed change of the oil pump in the second temperature interval than the speed change of the oil pump in the third temperature interval, since the viscosity of the oil increases with the decrease of the temperature, that is, the viscosity of the oil in the first temperature interval is less than the viscosity of the oil in the second temperature interval than the viscosity of the oil in the third temperature interval, if only the same set of control parameters is used in, when the viscosity of the oil is changed from low viscosity to high viscosity, the load is increased, the speed is reduced, if the rotating speed of the oil pump is reduced too fast, the step-out of the driving device can be caused, when the viscosity of the oil is changed from high viscosity to low viscosity, the load is reduced, the speed is increased, and if the rotating speed of the oil pump is increased too fast, the step-out of the driving device can be caused; therefore, one set of control parameters cannot meet the rotating speed control requirement of the oil pump in the three temperature intervals, and in the control mode, the rotating speed change requirements of the first temperature interval, the second temperature interval and the third temperature interval can be better met by adopting three sets of rotating speed change rates, so that the reliable operation of the oil pump in the three temperature intervals is facilitated. Referring to fig. 6, the open loop operation torque change rate k1 in the first set of control parameters is smaller than the open loop operation torque change rate k2 in the second set of control parameters is smaller than the open loop operation torque change rate k3 in the third set of control parameters, because the viscosity of the oil increases with the decrease of the oil temperature, when the viscosity of the oil increases, the load of the driving device increases, the torque required by the driving device also increases, if only the same set of control parameters is used in the three temperature ranges, the torque increases too slowly to be beneficial to the rotation of the driving device when the viscosity of the oil increases, and the torque increases faster to be beneficial to the increase of the torque in a relatively short time to be beneficial to the rotation of the driving device when the viscosity of the oil increases, so that one set of control parameters cannot meet the torque control requirements of the oil pump in the three temperature ranges, in the control mode, the three sets of torque change rates can better meet the torque control requirements in the three temperature ranges, thereby facilitating reliable rotation of the drive means.
Referring to fig. 6, fig. 6 is a block diagram of a second control mode of the oil pump, in the second control mode, the control system includes a change-over switch 3, the change-over switch 3 first connects the first branch 31, at this time, the rotation speed of the oil pump is controlled in an open-loop mode, until the rotation speed of the oil pump reaches a preset open-loop target rotation speed, the change-over switch 3 then connects the second branch 32, at this time, the oil pump is controlled in a closed-loop mode to operate at the closed-loop target rotation speed, where "the change-over switch 3" is a switch set in a control program, the switch selects to connect the first branch 31 or the second branch 32 depending on whether the rotation speed of the oil pump reaches the preset open-loop target rotation speed, when the preset open-loop target rotation speed is not reached, the change-over switch 3 connects the first branch 31, and when the preset open-loop target rotation speed is reached; referring to fig. 7, in a second control mode, the control system includes a first control unit, a second control unit, a third control unit, a fourth control unit, a rotation speed detection unit and a difference value calculation unit 4, the first control unit is used for controlling the speed of the rotation speed change of the oil pump, for example, the change time required for changing the last target rotation speed of the oil pump to the current target rotation speed is determined by the first control unit, where the target rotation speed of the input amount of the first control unit is a set value in a program, and the specific value thereof is different according to the temperature interval to which the oil temperature belongs, and the target rotation speed of the input amount of the first control unit includes the target rotation speed of open-loop operation and the target rotation speed of closed-loop operation, and the control parameters corresponding to the first control unit are the change rate of the open-loop operation rotation speed and the change rate of the closed-loop operation rotation speed, and the set value of the rotation, the faster the rotation speed changes, the "rotation speed change rate" herein refers to the change relationship of the rotation speed with time, wherein the open-loop operation rotation speed change rate comprises an open-loop operation rotation speed increase change rate and an open-loop operation rotation speed decrease change rate, and the closed-loop operation rotation speed change rate comprises a closed-loop operation rotation speed increase change rate and a closed-loop operation rotation speed decrease change rate; the second control unit controls the rotating speed and the torque of the driving device during open-loop operation, the control parameter corresponding to the second control unit is an open-loop operation torque change rate, the torque change rate is faster when the open-loop operation torque change rate is larger than a set value of the open-loop operation torque change rate, the torque change rate refers to the change rate corresponding to the torque along with the change of the rotating speed, specifically, the torque is increased along with the increase of the rotating speed when the power is gradually increased, and the torque is reduced along with the increase of the rotating speed when the power is constant; the third control unit performs deviation adjustment on the actual rotating speed of the oil pump according to the rotating speed difference value of the oil pump, so that the actual rotating speed of the oil pump is equal to the target rotating speed, and the control parameters corresponding to the third control unit are a first proportional gain coefficient and a first integral gain coefficient; the fourth control unit performs deviation adjustment on the actual torque of the oil pump according to the rotation speed difference value of the oil pump, and the control parameters corresponding to the fourth control unit are a second proportional gain coefficient and a second integral gain coefficient; the rotating speed detection unit is used for feeding back the actual rotating speed of the driving device; the difference calculating unit 4 performs difference calculation on the actual rotation speed and the target rotation speed.
The control parameters in the second control mode will be described in detail below; for the control parameters of the open-loop operation portion in the second control manner, reference may be made to the first control manner, which is not repeated herein, and the following mainly describes the control parameters corresponding to the closed-loop operation portion in the second control manner.
Referring to fig. 8, in the second control mode, the closed-loop operation target rotation speed z1 in the first set of control parameters is greater than the closed-loop operation target rotation speed z2 in the second set of control parameters is greater than the closed-loop operation target rotation speed z3 in the third set of control parameters.
Referring to fig. 8, the increasing change rate c1 of the closed-loop operation rotation speed in the first set of control parameters is greater than the increasing change rate c2 of the closed-loop operation rotation speed in the second set of control parameters is greater than the increasing change rate c3 of the closed-loop operation rotation speed in the third set of control parameters, the decreasing change rate d1 of the closed-loop operation rotation speed in the first set of control parameters is greater than the decreasing change rate d2 of the closed-loop operation rotation speed in the second set of control parameters is greater than the decreasing change rate d3 of the closed-loop operation rotation speed in the third set of control parameters, so that the rotation speed change of the oil pump in the first temperature interval is greater than the rotation speed change of the oil pump in the second temperature interval, since the viscosity of the oil increases along with the decrease of the temperature, if only one set of control parameters is used in the three temperature intervals, when the viscosity of the oil changes from low viscosity to, if the rotating speed of the oil pump is reduced too fast at the moment, the step-out of the driving device can be caused, when the viscosity of the oil is changed from high viscosity to low viscosity, the load is reduced, the speed needs to be increased at the moment, and if the rotating speed of the oil pump is increased too fast at the moment, the step-out of the driving device can be caused; and in this control mode, adopt three sets of rotational speed rate of change can satisfy the interval rotational speed change demand of first temperature interval, second temperature interval and third temperature to be favorable to making the oil pump reliably move in above-mentioned three temperature intervals.
Referring to fig. 8 again, the magnitude of the set value of the first proportional gain coefficient will directly relate to the response speed of the rotating speed during the closed-loop operation, and the magnitude of the set value of the first integral gain coefficient will directly relate to the steady-state error of the rotating speed during the closed-loop operation, in this embodiment, the set value e1 of the first proportional gain coefficient in the first set of control parameters is greater than the set value e2 of the first proportional gain coefficient in the second set of control parameters is greater than the set value e3 of the first proportional gain coefficient in the third set of control parameters, and the set value f1 of the first integral gain coefficient in the first set of control parameters is less than or equal to the set value f2 of the first integral gain coefficient in the second set of control parameters and is less than or equal to the set value f3 of the first integral gain coefficient in the third.
Referring to fig. 8 again, the magnitude of the setting value of the second proportional gain coefficient will directly relate to the response speed of the torque during the closed-loop operation, and the magnitude of the setting value of the second integral gain coefficient will directly relate to the steady-state error of the torque during the closed-loop operation, in this embodiment, the setting value g1 of the second proportional gain coefficient in the first set of control parameters is smaller than the setting value g2 of the second proportional gain coefficient in the second set of control parameters and is greater than or equal to the setting value g3 of the second proportional gain coefficient in the third set of control parameters, and the setting value h1 of the second integral gain coefficient in the first set of control parameters is smaller than the setting value h2 of the second integral gain coefficient in the second set of control parameters and is smaller than the setting value h3 of the second integral gain coefficient in the third set of control; the torque change when the oil pump is located the first temperature interval is less than the torque change that the oil pump is located the second temperature interval like this and is less than the torque change that the oil pump is located the third temperature interval, because the viscosity of oil increases along with the reduction of oil temperature, when the viscosity of oil increases like this, drive arrangement's load increases, the required torque of drive arrangement also needs to increase, if only adopt one set of parameter, torque increases too slowly when the viscosity is big and is unfavorable for drive arrangement's rotation, and torque increases to be favorable to increasing torque in the relatively short time so as to be favorable to drive arrangement's rotation when the viscosity grow of oil, in this control mode, adopt three sets of second proportional gain coefficient and second integral gain coefficient can satisfy the torque control requirement of above-mentioned three temperature intervals better, thereby be favorable to drive arrangement's rotation.
In the above two control modes, the values of the first set of control parameters, the second set of control parameters and the third set of control parameters are all set values of the control program, there are three cases, and one case is: three sets of control parameters are stored in a preset database, and the corresponding control parameters are obtained in a direct calling mode; the second case is: only any one of the first set of control parameters, the second set of control parameters or the second set of control parameters is stored in a preset database, and the numerical values of the first set of control parameters, the second set of control parameters and the third set of control parameters can be mutually transformed through program operation; the third case is: the preset database is stored with any two sets of the first set of control parameters or the second set of control parameters, and the numerical values of one set of control parameters can be mutually converted into the numerical values of the other set of control parameters through program operation.
In addition, according to the descriptions of the two control modes, the selection of the oil pump control mode corresponds to two situations, namely that the oil pump is controlled to operate by adopting the same control mode no matter which temperature interval the current temperature of the working medium is located in, and here, the oil pump can be controlled by adopting the first control mode, and the oil pump can also be controlled by adopting the second control mode; another case is to control the oil pump by using two different control methods, for example, a first control method is used in a first temperature range, a second control method is used in a second temperature range, and a second control method is used in a third temperature range, which are not listed as combinations of temperature ranges and control methods. When the control modes corresponding to different temperature intervals are the same, the parameter types in the first set of control parameters, the second set of control parameters and the third set of control parameters are the same, and the values corresponding to the control parameters of the same parameter type are different; when the control modes corresponding to different temperature intervals are different, the parameter types in the first set of control parameters, the second set of control parameters and the third set of control parameters are different, specifically, when the oil pump adopts the third set of control parameters to control the operation of the oil pump in the third temperature interval, if the control mode of the oil pump in the third temperature interval is the same as the control mode corresponding to the first temperature interval, the parameter types of the third set of control parameters are the same as the parameter types of the first set of control parameters, and the numerical values are different; if the control mode of the oil pump in the third temperature interval is the same as the control mode corresponding to the second temperature interval, the parameter type of the third set of control parameters is the same as that of the second set of control parameters, and the numerical values are different; when the control mode of the oil pump in the third temperature interval is different from the control modes corresponding to the first temperature interval and the second temperature interval, the parameter type of the third set of control parameters is different from the parameter types of the first set of control parameters and the second set of control parameters.
The application also discloses a control system for controlling the oil pump, and of course, the control system can be used for controlling other parts; referring to fig. 9, fig. 9 is a schematic diagram of a first embodiment of an oil pump control system, and referring to fig. 9, a control system 10 of an oil pump includes a temperature detection unit 101, a first control unit 102, and a second control unit 103, the temperature detection unit 101 being configured to detect a current temperature of a working medium; the first control unit 102 acquires a rotation speed control parameter at a corresponding temperature to control the rotation speed of the oil pump; the second control unit 103 acquires a torque control parameter at a corresponding temperature to control the torque of the oil pump; thus, the first control unit 102 and the second control unit 103 obtain different control parameters according to different temperatures to control the oil pump, so that the oil pump can operate reliably.
Referring to fig. 10, fig. 9 is a schematic diagram of a second embodiment of the oil pump control system, in this embodiment, the control system 10 ' of the oil pump includes a temperature detection unit 101 ', a first control unit 102 ', a second control unit 103 ', a difference operation unit 104 ', a third control unit 105 ', a fourth control unit 106 ', and a rotation speed detection unit 107 ', and the temperature detection unit 101 ' is used for detecting the current temperature of the working medium; the first control unit 102' acquires a rotation speed control parameter at a corresponding temperature to control the rotation speed of the oil pump; the second control unit 103' acquires a torque control parameter at a corresponding temperature to control the torque of the oil pump; the difference value operation unit 104' is used for calculating the difference value between the actual rotating speed of the oil pump and the target rotating speed; the third control unit 105' obtains the difference value between the actual rotating speed and the target rotating speed and carries out deviation adjustment on the actual rotating speed according to the rotating speed difference value; the fourth control unit 106' obtains the difference value between the actual rotating speed and the target rotating speed and performs deviation adjustment on the actual torque according to the rotating speed difference value; the rotation speed detection unit 107' is used for feeding back the actual rotation speed of the oil pump; thus, the first control unit 102 'and the second control unit 103' obtain different control parameters according to different temperatures l to control the oil pump, so that the oil pump can operate reliably.
It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (14)
1. A control method for controlling an oil pump, the oil pump including a drive device and a pump rotor, the drive device being capable of driving the pump rotor to rotate; defining a first temperature interval, wherein the current temperature of the working medium is greater than or equal to a preset first temperature in the first temperature interval; defining a second temperature interval, wherein in the second temperature interval, the current temperature of the working medium is less than the preset first temperature and is greater than or equal to the preset second temperature; the control method comprises the following steps:
acquiring the current temperature of the working medium;
acquiring a control parameter corresponding to the current temperature of the working medium;
if the current temperature of the working medium is in the first temperature interval, the control system controls the oil pump to operate according to a first set of control parameters;
if the current temperature of the working medium is in the second temperature interval, the control system controls the oil pump to operate according to a second set of control parameters;
the first set of control parameters and the second set of control parameters comprise a set value of a rotating speed change rate, the larger the set value of the rotating speed change rate is, the faster the rotating speed change is, and the rotating speed change rate of the control system when the control system controls the oil pump to operate by using the first set of control parameters is larger than the rotating speed change rate of the control system when the control system controls the oil pump to operate by using the second set of parameters.
2. The control method according to claim 1, characterized in that: the first set of control parameters and the second set of control parameters comprise torque change rate set values, the larger the torque change rate set values are, the faster the torque change is, and the torque change rate when the control system controls the oil pump to operate with the first set of control parameters is smaller than the torque change rate when the control system controls the oil pump to operate with the second set of parameters.
3. The control method according to claim 1 or 2, characterized in that: the control modes of the oil pump comprise two modes, the first control mode is to control the rotating speed of the oil pump to reach a target rotating speed in an open-loop mode, and in the first control mode, the first set of control parameters and the second set of control parameters only comprise control parameters in the open-loop mode; the second control mode is that the rotating speed of the oil pump is controlled in an open-loop mode firstly until the rotating speed of the oil pump reaches a preset open-loop target rotating speed, and then the oil pump is controlled to operate at the closed-loop target rotating speed in a closed-loop mode.
4. The control method according to claim 3, characterized in that: in the first control mode, the rotation speed change rate of the oil pump includes an open-loop operation rotation speed increase change rate and an open-loop operation rotation speed decrease change rate, the open-loop operation rotation speed increase change rate when the control system controls the oil pump to operate by a first set of control parameters is greater than that when the control system controls the oil pump by a second set of parameters, and the open-loop operation rotation speed decrease change rate when the oil pump operates is greater than that when the control.
5. The control method according to claim 3, characterized in that: in the second control manner, the rate of change of the rotation speed of the oil pump includes an open-loop operation rate of change and an open-loop operation rate of change; the open-loop rotating speed change rate comprises an open-loop operating rotating speed increase change rate and an open-loop operating rotating speed reduction change rate, the open-loop operating rotating speed increase change rate when the control system controls the oil pump to operate by using a first set of control parameters is greater than the open-loop operating rotating speed increase change rate when the control system controls the oil pump to operate by using a second set of parameters, and the open-loop operating rotating speed reduction change rate when the control system controls the oil pump to operate by using the first set of control parameters is greater than the open-loop operating rotating speed reduction change rate when the control system controls the oil pump to operate; the closed-loop rotating speed change rate comprises a closed-loop operating rotating speed increase change rate and a closed-loop operating rotating speed reduction change rate, the closed-loop operating rotating speed increase change rate when the control system controls the oil pump to operate according to a first set of control parameters is larger than the closed-loop operating rotating speed increase change rate when the control system controls the oil pump to operate according to a second set of parameters, and the closed-loop operating rotating speed reduction change rate when the control system controls the oil pump to operate according to the first set of control parameters is larger than the closed-loop operating rotating speed reduction change rate when the control system controls the oil pump to operate.
6. The control method according to claim 4 or 5, characterized in that: when the control modes corresponding to different temperature intervals are the same, the parameter types in the first set of control parameters are the same as the parameter types in the second set of control parameters, and the numerical values are different; when the control modes corresponding to different temperature intervals are different, the parameter types in the first set of control parameters and the parameter types in the second set of control parameters are not completely the same.
7. The control method according to any one of claims 1 to 6, characterized in that: presetting a third temperature in a control program, wherein the third temperature is higher than the second temperature and lower than the first temperature; defining a second sub-temperature interval and a second sub-temperature interval, wherein in the second sub-temperature interval, the current temperature of the working medium is greater than or equal to the third temperature and less than the first temperature, and in the second sub-temperature interval, the current temperature of the working medium is greater than the second temperature and less than the third temperature; when the current temperature of the working medium is in a first temperature interval, the control system controls the oil pump to operate to a first target rotating speed according to the first set of control parameters; when the current temperature of the working medium is in a second sub-temperature interval, the control system controls the oil pump to operate to a second target rotating speed according to the second set of control parameters; when the temperature of the working medium is in a second branch temperature interval, the control system controls the oil pump to operate to the third target rotating speed according to the second set of control parameters; the third target rotational speed is less than the second target rotational speed and less than the first target rotational speed.
8. The control method according to claim 7, characterized in that: and defining a third temperature interval, wherein the current temperature of the working medium is lower than the second temperature in the third temperature interval, and if the current temperature of the working medium is in the third temperature interval, the oil pump stops running or the control system controls the oil pump to run by using a third set of control parameters.
9. The control method according to claim 8, characterized in that: when the current temperature of the working medium is in the third temperature interval, if the control system controls the oil pump to operate according to the third set of control parameters, the rotating speed change rate of the control system when the control system controls the oil pump to operate according to the third set of control parameters is smaller than that of the control system when the control system controls the oil pump to operate according to the second set of parameters, and the torque change rate of the control system when the control system controls the oil pump to operate according to the third set of control parameters is larger than that of the control system when the control system controls the oil pump to operate according to the second set of parameters.
10. The control method according to claim 9, characterized in that: when the control mode of the oil pump in the third temperature interval is the same as the control mode corresponding to the first temperature interval, the parameter type of the third set of control parameters is the same as that of the first set of control parameters, and the numerical values are different; when the control mode of the oil pump in the third temperature interval is the same as the control mode corresponding to the second temperature interval, the parameter type of the third set of control parameters is the same as that of the second set of control parameters, and the numerical values are different; when the control mode of the oil pump in the third temperature interval is different from the control modes corresponding to the first temperature interval and the second temperature interval, the parameter type of the third set of control parameters is different from the parameter types of the first set of control parameters and the second set of control parameters.
11. An oil pump, comprising a drive device and a pump rotor, the drive device being capable of driving the pump rotor to rotate; the oil pump further comprises a processor, the processor is electrically connected or in signal connection with the driving device, and the processor can receive and execute program instructions so as to enable the driving device to operate, and further realize the control method of any one of claims 1 to 10.
12. The oil pump of claim 11, wherein: the program instruction is stored in the upper computer or the oil pump further comprises a memory, and the program instruction is stored in the memory.
13. A control system for controlling an oil pump, the control system comprising:
a temperature detection unit for detecting a current temperature of the working medium;
the first control unit is used for acquiring a rotating speed control parameter at a corresponding temperature to control the rotating speed of the oil pump;
and the second control unit acquires the torque control parameters at the corresponding temperature to control the torque of the oil pump.
14. The oil pump control system according to claim 13, characterized in that: the control system further comprises:
a difference value calculation unit that calculates a difference value between an actual rotation speed of the oil pump and a target rotation speed;
the third control unit is used for acquiring the difference value between the actual rotating speed and the target rotating speed and carrying out deviation adjustment on the actual rotating speed according to the rotating speed difference value;
the fourth control unit is used for acquiring the difference value between the actual rotating speed and the target rotating speed and carrying out deviation adjustment on the actual torque according to the rotating speed difference value;
and the rotating speed detection unit is used for feeding back the actual rotating speed of the oil pump.
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| CN201910865663.2A CN112483426B (en) | 2019-09-12 | 2019-09-12 | Control method, oil pump and control system |
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| CN201910865663.2A CN112483426B (en) | 2019-09-12 | 2019-09-12 | Control method, oil pump and control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113581161A (en) * | 2021-08-30 | 2021-11-02 | 奇瑞汽车股份有限公司 | Control method and device for electric oil pump and storage medium |
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| JP2005048660A (en) * | 2003-07-28 | 2005-02-24 | Terumo Corp | Liquid pump device |
| JP3159230U (en) * | 2010-02-19 | 2010-05-13 | 古河ユニック株式会社 | Pressure oil control device for work machines |
| US20120244012A1 (en) * | 2011-03-22 | 2012-09-27 | Hitachi Automotive Systems, Ltd. | Apparatus for Controlling Electric Oil Pump |
| CN207470442U (en) * | 2016-08-18 | 2018-06-08 | 阿特拉斯·科普柯空气动力股份有限公司 | Injected compressor and its controller unit and oil spout vacuum pump and its controller unit |
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| CN113581161A (en) * | 2021-08-30 | 2021-11-02 | 奇瑞汽车股份有限公司 | Control method and device for electric oil pump and storage medium |
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