CN111483287A - Method and device for controlling recovered energy of HVH (high voltage direct current) of electric vehicle - Google Patents
Method and device for controlling recovered energy of HVH (high voltage direct current) of electric vehicle Download PDFInfo
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- CN111483287A CN111483287A CN201910083833.1A CN201910083833A CN111483287A CN 111483287 A CN111483287 A CN 111483287A CN 201910083833 A CN201910083833 A CN 201910083833A CN 111483287 A CN111483287 A CN 111483287A
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000011084 recovery Methods 0.000 claims abstract description 117
- 238000010438 heat treatment Methods 0.000 claims abstract description 115
- 238000009826 distribution Methods 0.000 claims abstract description 26
- 230000004044 response Effects 0.000 claims abstract description 8
- 238000013021 overheating Methods 0.000 claims description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052744 lithium Inorganic materials 0.000 abstract description 16
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 10
- 238000011161 development Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
- B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
Abstract
The invention relates to the field of electric vehicle control, and provides a method and a device for controlling the recovered energy of an HVH (high voltage direct current) of an electric vehicle, wherein the method for controlling the recovered energy of the HVH of the electric vehicle comprises the following steps: receiving a heating starting instruction, and sending a high-pressure heater starting request to the vehicle control unit based on the heating starting instruction; receiving an enable permission instruction in response to a high-pressure heater turn-on request from the vehicle control unit; triggering to close the high-pressure heater relay based on the enabling permission instruction; the on-off state of the high-voltage heater relay is detected, and the closed state information corresponding to the closed state of the high-voltage heater relay is sent to the vehicle control unit, so that the vehicle control unit can distribute power generated by energy recovery to the high-voltage heater based on the closed state information when the electric vehicle is in an energy recovery working condition. Therefore, the energy recovery power distribution is well controlled when no HVH controller is provided, and the potential safety hazard of lithium over-charging and lithium separation of the battery during energy recovery heating is reduced.
Description
Technical Field
The invention relates to the technical field of electric vehicle control, in particular to a method and a device for controlling the recovered energy of an HVH (high voltage direct current) of an electric vehicle.
Background
Unlike an oil-fired vehicle, which can heat the cockpit by using waste heat of an internal combustion engine, a pure electric vehicle generally heats the cockpit by using an HVH (High Voltage Heater). In order to increase the energy utilization rate and the service performance of the electric automobile, some electric automobiles are also provided with an energy recovery function, and the power generated by energy recovery can be distributed to vehicle energy consumption components, such as an HVH, so that the recovered energy can be used for vehicle-mounted air conditioning heating.
The control for the HVH at present may generally be controlled by an HVH controller. The HVH controller can monitor the actual work state of the HVH and the actual consumed power of the HVH, and the power usage is carried out during work according to the power signal uploaded by the HVH; in addition, some vehicle models control the HVH based on no HVH controller, but only control the vehicle models by using an HVH single-gear relay, and the vehicle models can only directly perform corresponding opening and closing operations based on user operations.
The inventor of the present application finds at least the following problems in the related art at present in practicing the present application: on one hand, providing an HVH controller to exclusively manage the high voltage electric heater increases costs and also requires adaptive development of the HVH controller; on the other hand, for a Control method without an HVH controller, when a user triggers an HVH heating button for starting an Air conditioning interface, an AC (Air Conditioner) controller receives a heating start signal from a VCU (Vehicle Control Unit), and then closes an HVH relay based on the start signal in a normal state, and accordingly the VCU distributes power generated by energy recovery, but when the HVH relay is not closed due to a fault, the VCU still distributes heating power to the HVH, but the HVH does not consume heating power, which causes an excessively high charging power distributed to a high-voltage battery pack and an overcharging of the Vehicle power, and easily causes a lithium separation phenomenon of the high-voltage battery pack.
It should be noted that the above description of the related art is only for the purpose of making the public more clearly understand the present invention, and does not represent that the applicant is admitted that the related art is the prior art, and it may also be a technical solution which is not disclosed temporarily in the development stage.
Disclosure of Invention
In view of the above, the present invention is directed to a method for controlling recovered energy of an HVH of an electric vehicle, so as to solve at least the problems in the related art that the HVH controller increases the production and development costs, and the HVH controller cannot control the energy recovery power distribution well under the energy recovery condition without the HVH controller, which may cause the over-charging and lithium-separating of the battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for controlling the recovered energy of a high-pressure heater of an electric automobile is applied to a vehicle-mounted air conditioner controller, and comprises the following steps: receiving a heating starting instruction, and sending a high-voltage heater starting request to a vehicle control unit based on the heating starting instruction; receiving an enable permission instruction from the vehicle control unit in response to the high-pressure heater turn-on request; triggering to close a high-pressure heater relay based on the enabling permission instruction; the method comprises the steps of detecting the on-off state of the high-voltage heater relay, and sending closed state information corresponding to the fact that the high-voltage heater relay is in the closed state to a vehicle control unit, so that the vehicle control unit can distribute power generated by energy recovery to the high-voltage heater based on the closed state information when the electric vehicle is in an energy recovery working condition.
Further, after the closed state information corresponding to the closed state of the high-voltage heater relay is sent to the vehicle control unit, the method for controlling the recovered energy of the high-voltage heater of the electric vehicle further comprises the following steps: detecting the heating temperature of the high-pressure heater, and generating an overheat protection instruction according to the heating temperature; sending the overheating protection command to the vehicle control unit so that the vehicle control unit stops distributing power generated by energy recovery to the high-pressure heater based on the overheating protection command.
Compared with the prior art, the method for controlling the recovered energy of the high-pressure heater of the electric automobile has the following advantages:
according to the method for controlling the recovered energy of the high-voltage heater of the electric automobile, the vehicle-mounted air conditioner controller can detect the switching state of the high-voltage heater relay after responding to the enable permission instruction and operating and closing the high-voltage heater relay, and can send the closing state information to the vehicle control unit when the high-voltage heater relay is in the closing state, so that the power is distributed when the vehicle control unit determines that the high-voltage heater relay is in the closing state, the problem that the battery is overcharged due to the fact that the vehicle control unit can calculate HVH heating power when the HVH relay does not respond to the enable permission instruction to be closed is avoided, the problem that the battery of the electric automobile is overcharged and lithium is analyzed due to the fact that a circuit where the high-voltage heater is located cannot be overcharged under the fault disconnection state is also guaranteed, and potential safety hazards of the battery of.
Another objective of the present invention is to provide a method for controlling recovered energy of a high-voltage heater of an electric vehicle, so as to solve at least the problems of the prior art that the HVH controller increases the production and development costs, and the HVH controller does not control the energy recovery power distribution well under the energy recovery condition without the HVH controller, which may result in the overcharge and lithium precipitation of the battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for controlling the recovered energy of a high-voltage heater of an electric vehicle is applied to a vehicle control unit, and comprises the following steps: receiving a high pressure heater turn-on request from a vehicle air conditioner controller; judging whether the energy recovery power condition of the whole vehicle is met or not based on the starting request of the high-pressure heater; when the judgment result indicates that the energy recovery power condition of the whole vehicle is met, sending an enabling permission instruction to a vehicle-mounted air conditioner controller for triggering to close a high-pressure heater relay; and receiving closing state information indicating that the high-pressure heater relay is in a closing state from the vehicle-mounted air conditioner controller, and distributing power generated by energy recovery to the high-pressure heater based on the closing state information.
Further, the high pressure heater opens the request and includes the target heating temperature, wherein it includes to judge whether whole car energy recuperation power condition satisfies: acquiring the current energy recovery power of the whole vehicle; analyzing the target heating temperature contained in the high-pressure heater starting request; determining a target required heating power corresponding to the target heating temperature based on a pre-configured rack data table aiming at the high-pressure heater, wherein the target required heating power is the power to be distributed to the high-pressure heater, and the rack data table comprises a plurality of heating temperatures and a plurality of corresponding required heating powers; and judging whether the current vehicle energy recovery power condition is met or not according to the vehicle energy recovery power and the target required heating power.
Further, after distributing the power generated by energy recovery to the high-pressure heater based on the closed state information, the method for controlling the recovered energy of the high-pressure heater of the electric vehicle further includes: and receiving an overheating protection instruction from the vehicle-mounted air conditioner controller, and stopping distributing the power generated by energy recovery to the high-pressure heater based on the overheating protection instruction.
Further, the recovered energy control method of the HVH of the electric vehicle, after distributing power generated by energy recovery to the high voltage heater based on the closed state information, further includes: receiving a heating stop instruction, and stopping distribution of power generated by energy recovery to the high-pressure heater based on the heating stop instruction.
Further, after distributing the power generated by energy recovery to the high-pressure heater based on the closed state information, the method for controlling the recovered energy of the high-pressure heater of the automobile further comprises the following steps: distributing power generated by energy recovery to a high-voltage battery pack of the electric vehicle, except for being distributed to the high-voltage heater.
Compared with the prior art, the method for controlling the recovered energy of the high-pressure heater of the electric automobile has the following advantages:
in the method for controlling the recovered energy of the high-voltage heater of the electric automobile, after receiving the starting request of the high-voltage heater, the vehicle controller can firstly judge whether the recovered power condition of the vehicle under the corresponding energy recovery working condition is met, and sends the enabling permission instruction for starting the high-voltage heater after the recovered power condition of the vehicle is met, so that the problem that the high-voltage battery is excessively charged and separated lithium due to the fact that the power is directly calculated and distributed and the HVH heating power is not used is avoided; and then, the target required heating power is distributed to the high-pressure heater after the closing state information indicating that the relay of the high-pressure heater is in the closing state is received, so that the potential safety hazard of battery overcharge when the vehicle controller distributes the energy recovery power of the whole vehicle for heating is reduced.
An object of the present invention is to provide a vehicle air conditioner controller, so as to at least solve the problems in the related art that the HVH controller increases the production and development costs, and the energy recovery power distribution cannot be well controlled under the energy recovery condition without the HVH controller, which may result in the over-charging and lithium-separating of the battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an in-vehicle air conditioning controller, the in-vehicle air conditioning controller comprising: the heating request sending unit is used for receiving a heating starting instruction and sending a high-voltage heater starting request to the whole vehicle controller based on the heating starting instruction; an enable instruction receiving unit for receiving an enable permit instruction in response to the high-pressure heater turn-on request from the vehicle control unit; the relay closing triggering unit is used for triggering and closing the high-pressure heater relay based on the enabling permission instruction; the recovery power distribution request unit is used for detecting the switching state of the high-voltage heater relay and sending the closing state information corresponding to the closing state of the high-voltage heater relay to the vehicle control unit, so that the vehicle control unit can distribute power generated by energy recovery to the high-voltage heater based on the closing state information when the electric vehicle is in an energy recovery working condition.
Another objective of the present invention is to provide a vehicle control unit, so as to solve at least the problems of the prior art that the HVH controller increases the production and development costs, and the energy recovery power distribution cannot be well controlled under the energy recovery condition without the HVH controller, which may result in the over-charging and lithium-separating of the battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle control unit, comprising: a heating request receiving unit for receiving a high-pressure heater starting request from a vehicle-mounted air conditioner controller; the recovery power condition judging unit is used for judging whether the energy recovery power condition of the whole vehicle is met or not based on the starting request of the high-pressure heater; the enabling instruction sending unit is used for sending an enabling allowing instruction to the vehicle-mounted air conditioner controller when the judgment result indicates that the energy recovery power condition of the whole vehicle is met, so as to trigger the closing of the high-pressure heater relay; and the recovered power distribution unit is used for receiving closed state information used for indicating that the high-pressure heater relay is in a closed state from the vehicle-mounted air conditioner controller and distributing power generated by energy recovery to the high-pressure heater based on the closed state information.
Further, the vehicle control unit further includes: and the power distribution stopping unit is used for receiving an overheating protection instruction from the vehicle-mounted air conditioner controller and stopping distributing the power generated by energy recovery to the high-pressure heater based on the overheating protection instruction.
Compared with the prior art, the vehicle-mounted air conditioner controller and the vehicle control unit have the same advantages as the recovered energy control method of the electric vehicle high-pressure heater, and are not repeated herein.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method for controlling recovered energy of a high-pressure heater of an electric vehicle applied to a vehicle-mounted air conditioner controller according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for controlling recovered energy of a high-pressure heater of an electric vehicle applied to a vehicle control unit according to another embodiment of the present invention;
FIG. 3 is a flowchart illustrating an exemplary implementation of S22 in the method for controlling the recovered energy of the high-pressure heater of the electric vehicle shown in FIG. 2;
FIG. 4 is a schematic flow chart illustrating a method for controlling the recovered energy of the high-pressure heater of the electric vehicle according to an embodiment of the present invention;
FIG. 5 is a timing signal control diagram illustrating the start of heating using recovered power by applying the recovered energy control method of the high-pressure heater for an electric vehicle according to the embodiment of the present invention;
FIG. 6 is a timing signal control diagram illustrating a method for controlling recovered energy of a high-pressure heater of an electric vehicle according to an embodiment of the present invention to stop heating using recovered power;
fig. 7 is a block diagram of a configuration of an in-vehicle air conditioner controller according to an embodiment of the present invention;
fig. 8 is a block diagram of a vehicle control unit according to an embodiment of the present invention.
Description of reference numerals:
10 vehicle-mounted air conditioner controller 701 heating request sending unit
702 enable instruction receiving unit 703 relay closing trigger unit
704 recovered power allocation request unit 20 vehicle control unit
801 heating request receiving section 802 recovered power condition determining section
803 enable instruction transmission unit 804 to recover power allocation unit
805 power distribution stopping unit
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, a method for controlling recovered energy of a high-pressure heater of an electric vehicle applied to a vehicle-mounted air conditioner controller according to an embodiment of the present invention includes:
and S11, receiving a heating starting instruction, and sending a high-pressure heater starting request to the vehicle control unit based on the heating starting instruction of the user.
The execution main body of the method of the embodiment of the invention can be an on-board air conditioner controller, and particularly, the on-board air conditioner controller can realize the control of heating and cooling of a vehicle, for example, the control of a high-pressure heater HVH in an on-board air conditioner is used for realizing a heating function, and the control of a compressor in the on-board air conditioner is used for realizing a cooling function. Accordingly, the embodiments of the present invention mainly relate to start-stop control of a high-voltage heater, and in particular, to optimization of a start-stop control process of a high-voltage heater HVH in an energy recovery condition of an electric vehicle without an HVH controller.
In the embodiment of the invention, the vehicle-mounted air conditioner controller can assist the vehicle-mounted air conditioner controller in managing the on and off of the high-pressure heater through data communication interaction between the vehicle-mounted air conditioner controller and the vehicle controller. Regarding the heating start instruction, it may be triggered by a user touching a heating button on an air-conditioning panel of the vehicle, and after receiving the heating start instruction, the vehicle-mounted air-conditioning controller does not directly close the high-pressure heater relay, but sends a high-pressure heater start request to the vehicle controller to make the vehicle controller prepare for starting the high-pressure heater, for example, calculate a target required heating power of a portion that distributes power generated by energy recovery to the high-pressure heater.
In addition, the heating start instruction may further include a target heating temperature requested by the user, so that the vehicle control unit may determine the heating power corresponding to the target heating temperature.
And S12, receiving an enabling permission instruction responding to the high-pressure heater starting request from the vehicle control unit.
As an example, it may be that the vehicle control unit generates an enable permission command if it determines that the high-pressure heater start condition is satisfied, and then sends the enable permission command to the vehicle-mounted air conditioner controller.
And S13, triggering and closing the high-pressure heater relay based on the enabling permission instruction.
Wherein, after the vehicle-mounted air conditioner controller receives the enabling permission instruction, the high-pressure heater relay can be triggered to be closed. However, in some cases, such as fault conditions, the on-board air conditioning controller may not command the high pressure heater relay to close based on the enable allowance; it should be noted that, the vehicle control unit in the related art does not know whether the high-voltage heater relay is closed, so it will continue to distribute power to the HVH; therefore, in the prior art, the battery charging required power and the heating power of the high-voltage heater are considered when the vehicle control unit calculates the recovered energy distribution because the high-voltage heater relay is in an off state, but the HVH does not consume power because the high-voltage heater relay is off, and the power distributed to the high-voltage heater is attributed to the high-voltage battery pack at the moment, so that the problem of over-charging lithium separation exists because the power on the battery side is too large.
S14, detecting the on-off state of the high-voltage heater relay, and sending the closed state information corresponding to the closed state of the high-voltage heater relay to the vehicle control unit, so that the vehicle control unit can distribute the power generated by energy recovery to the high-voltage heater based on the closed state information when the electric vehicle is in the energy recovery working condition.
Regarding the detection of the switching state of the high-voltage heater relay, it may be realized by various means, for example, detection based on a switching state detector, or the like.
In the embodiment of the invention, after the high-voltage heater relay is operated and closed in response to the enabling permission instruction, the on-off state of the high-voltage heater relay is detected, and the on-off state information is sent to the vehicle control unit when the high-voltage heater relay is in the on state, so that the power is distributed when the vehicle control unit determines that the high-voltage heater relay is in the on state, the problem of battery overcharge caused by calculation of HVH heating power of the vehicle control unit when the HVH relay does not respond to the enabling permission signal for closing is avoided, the lithium precipitation caused by the battery overcharge of the electric vehicle when a circuit where the high-voltage heater is located is in a fault off state is also ensured, and the potential safety hazard of the battery of the electric vehicle during heating in the energy recovery process is reduced.
In some embodiments, after the high pressure heater is activated, the high pressure heater needs to be shut down, which may be recommended to shut down or stop the operation of the high pressure heater in the following manner: firstly, detecting the heating temperature of HVH, and generating an overheat protection instruction according to the heating temperature; then, an over-temperature protection command is sent to the vehicle control unit, so that the vehicle control unit stops distributing the power generated by energy recovery to the high-voltage heater based on the over-temperature protection command.
The overheat protection command may be automatically generated by the high-pressure heater due to overheat protection. For example, the high-pressure heater has a PTC (Positive Temperature Coefficient) characteristic, and when the Temperature of the high-pressure heater HVH exceeds a thermal protection Temperature threshold, the high-pressure heater is turned off by overheating, and accordingly the vehicle-mounted air conditioner controller may generate an overheating protection command.
In the embodiment, at the starting stage of the high-voltage heater, the closed state information is used for triggering the vehicle control unit to distribute power, so that the power generated by energy recovery is distributed to the high-voltage heater when the electric vehicle is under the energy recovery working condition only by triggering when the relay is in the closed state, the problem of battery overcharge caused by the fact that the HVH does not work due to the fact that the HVH heating power is considered in the process of calculating and distributing the recovered power by the vehicle control unit is avoided, and potential safety hazards of the battery when the electric vehicle heats by utilizing the recovered energy are reduced; in addition, in the shutdown stage of the high-pressure heater, the vehicle-mounted air conditioner controller can detect that an overheat protection instruction is generated when the heating temperature of the high-pressure heater is too high, and then directly sends the overheat protection instruction to the vehicle control unit, so that the vehicle control unit stops distributing the power generated by energy recovery to the high-pressure heater based on the overheat protection instruction, therefore, the power distribution of the vehicle control unit to the high-pressure heater can be quickly blocked when the high-pressure heater is in overheat protection, and the hidden danger of battery overcharge and lithium precipitation in an overheat protection state is reduced.
It should be noted that, in the implementation process of this embodiment, in the starting stage of the high-pressure heater, the vehicle control unit is triggered to perform power distribution through the closed state information of the relay, which may affect the timeliness of energy recovery power distribution to a certain extent, so as to reduce the energy recovery utilization rate; however, rather than incurring the battery over-charging lithium extraction problem after power distribution, it would also reduce the lithium extraction potential at the expense of a small amount of energy recovery. In addition, in the shutdown stage of the high-voltage heater, the heating power distribution to the HVH is stopped by directly responding to the overheat protection command, and although the recovery utilization rate may be reduced by a small amount, the safety of the high-voltage battery pack in the heating process by utilizing the recovered energy is guaranteed.
As shown in fig. 2, the method for controlling the recovered energy of the high-pressure heater of the electric vehicle applied to the vehicle control unit according to an embodiment of the present invention includes:
and S21, receiving a high-pressure heater starting request from the vehicle-mounted air conditioner controller.
And S22, judging whether the energy recovery power condition of the whole vehicle is met or not based on the high-pressure heater opening request.
The determination condition as to whether the energy recovery power condition of the entire vehicle is satisfied may be whether the entire vehicle is in an energy recovery working condition, or may include other additional conditions, for example, whether the power generated by the entire vehicle due to recovery is sufficient to be simultaneously allocated to the high-voltage heater for heating and charging the high-voltage battery pack, or the like.
In some embodiments, the high-pressure heater turn-on request includes a target heating temperature, such as a target heating temperature selected by a user or a target heating temperature determined by adaptation, and the determination process as to whether the vehicle power condition is satisfied may be determined by a process shown in fig. 3: s221, acquiring the current energy recovery power of the whole vehicle; s222, analyzing the target heating temperature contained in the high-pressure heater starting request; s223, determining target required heating power corresponding to the target heating temperature based on a pre-configured rack data table for the high-voltage heater, wherein the target required heating power is power to be distributed to the high-voltage heater, and the rack data table comprises a plurality of heating temperatures and a plurality of corresponding required heating powers; s224, judging whether the current finished automobile power condition is met or not according to the finished automobile energy recovery power and the target required heating power; exemplarily, when the energy recovery power of the whole vehicle is greater than the target required heating power, or the distributed target required heating power does not influence the energy recovery power of the whole vehicle to normally charge the high-voltage battery pack, it is determined that the current condition of the energy recovery power of the whole vehicle of the electric vehicle is satisfied, and the target required heating power is allowed to be distributed to the high-voltage heater.
It should be noted that, because the heating characteristics of different high-pressure heaters are different, the rack data tables corresponding to different high-pressure heaters may also be different, and the rack data tables may be provided by heater manufacturers or calibrated by the vehicle enterprises, and the required heating powers respectively matched with different heating temperatures can be obtained through the rack data tables. In addition, other data parameters, such as a corresponding voltage parameter, may be added to the gantry data table to facilitate accurate power distribution of the vehicle control unit.
And S23, when the judgment result indicates that the vehicle recovered power condition is met, sending an enabling permission instruction to the vehicle-mounted air conditioner controller for triggering the closing of the high-pressure heater relay.
In addition, when the judgment result indicates that the recovery power of the whole vehicle is not met, the on-off operation of the high-pressure heater relay can be directly controlled to stop responding.
And S24, receiving closing state information used for indicating that the high-pressure heater relay is in a closing state from the vehicle-mounted air conditioner controller, and distributing power generated by energy recovery to the high-pressure heater based on the closing state information.
In the embodiment of the invention, after receiving the starting request of the high-voltage heater, the vehicle controller can firstly judge whether the vehicle recovery power condition under the corresponding energy recovery working condition is met, and sends the enabling permission instruction for starting the high-voltage heater after the vehicle recovery power condition is met, so that the problem of lithium over-charging and lithium-separating of a high-voltage battery pack caused by directly calculating and distributing power and unused HVH heating power is avoided; and then, the target required heating power is distributed to the high-pressure heater after the closing state information indicating that the relay of the high-pressure heater is in the closing state is received, so that the potential safety hazard of a battery when the vehicle controller distributes the energy recovery power of the whole vehicle for heating is reduced.
Further, during the turn-off of the high-pressure heater, when the vehicle receives an overheat protection instruction from the on-vehicle air conditioning controller, the distribution of power generated by energy recovery to the high-pressure heater is stopped based on the overheat protection instruction. . The overheat protection instruction can be generated by triggering the high-voltage heater due to overheat protection, so that the vehicle control unit stops distributing power to the high-voltage heater based on the overheat protection instruction, the vehicle control unit quickly stops distributing energy recovery power to the high-voltage heater based on the overheat protection instruction is realized, and the overcharge phenomenon of the high-voltage battery pack is avoided.
Further, during the turn-off process of the high-pressure heater, the vehicle control unit may receive a heating stop instruction, and stop distributing the power generated by energy recovery to the high-pressure heater based on the heating stop instruction. The heating stop instruction can be generated by a user interactive operation terminal interface, so that the heating stop instruction can be responded in time when being received, the heating power used for the high-voltage heater in the energy recovery power is eliminated, and the potential safety hazard of the high-voltage battery pack for over-charging and lithium-separating is also reduced.
In the embodiment, the vehicle control unit is used for calculating and distributing the power generated by energy recovery, one of which may be distributed to the high-voltage heater for heating, and the other of which may be distributed to the high-voltage battery pack for charging, for example, the power generated by energy recovery other than that distributed to the high-voltage heater may be distributed to the high-voltage battery pack of the electric vehicle. When the power distributed to the HVH is calculated to be not consumed by the HVH due to the disconnection of the HVH, the power of the part can be transmitted to the high-voltage battery pack, so that the power of the high-voltage battery pack side is overhigh, and the risk of overcharging lithium exists.
As shown in fig. 4, the principle flow of the recovered energy control method of the high-pressure heater of the electric vehicle according to an embodiment of the present invention includes a data interaction execution process between the vehicle-mounted air conditioner controller 10 and the vehicle control unit 20:
1) the vehicle-mounted air conditioner controller 10 receives a user heating operation, generates an HVH starting request according to the user heating operation, and pre-configures HVH rack data in the vehicle controller 20;
2) the vehicle-mounted air conditioner controller 10 sends an HVH starting request to the vehicle control unit 20;
3) the vehicle controller 20 determines whether the vehicle recovered power condition is satisfied, and sends an enable allowing instruction to the vehicle-mounted air conditioner controller 10 when it is determined that the vehicle recovered power condition is satisfied, where the determination process as to whether the vehicle recovered power condition is satisfied may refer to the description of the related embodiments above, and is not described herein again;
4) the vehicle-mounted air conditioner controller 10 controls the HVH relay to be closed based on the permission enable instruction;
5) the vehicle-mounted air conditioner controller 10 detects the on-off state of the high-pressure heater relay, and sends closing state information indicating that the relay is in the closing state to the vehicle control unit 20 when the relay is in the closing state;
6) the hybrid vehicle controller 20 distributes the target required heating power in response to the HVH on request from the energy recovery power based on the closed state information;
7) when the HVH is self-protected due to over-temperature, the vehicle-mounted air conditioner controller 10 may generate an over-temperature protection instruction and send the over-temperature protection instruction to the vehicle controller 20;
8) the vehicle-mounted air conditioner controller 10 triggers the disconnection of the HVH relay based on the over-temperature protection instruction, and the vehicle controller 20 stops the distribution of the energy recovery power to the high-voltage heater based on the over-temperature protection instruction.
Alternatively, when the on-board air conditioning controller 10 receives a user operation to generate a heating stop instruction, it may be that the vehicle control unit is triggered to stop allocating the energy recovery power to the HVH instead of the over-temperature protection instruction.
Aiming at a control mode without an HVH controller, after the HVH is started and closed, if the HVH power is improperly used, the problem of lithium overcharge and precipitation of a battery when the whole vehicle recovered power is used for heating can be caused. The embodiment of the invention provides that three HVH enabling signals are combined with HVH actual working state, HVH starting request and VCU permission HVH actual frame data to make a communication control strategy on power use occasion. Wherein, the HVH actual bench data can be provided by HVH manufacturer; (1) the HVH starting request is an HVH starting request signal sent by the AC to the VCU after a driver presses a heating button on an air conditioner panel, and the AC controls the HVH relay to be closed after receiving an enabling allowing instruction sent by the VCU; (2) the VCU allows HVH enabling, namely an enabling allowing instruction sent to the AC on the premise that the VCU judges that the condition of the recovered power of the whole vehicle is met and the high-voltage relay is closed after receiving the HVH starting request; (3) the actual work state of the HVH is reported to the VCU by the AC after the HVH relay is closed.
Through the technical scheme of the embodiment of the invention, the strategy formulation is carried out on the power use time of the control mode without the HVH controller, so that the problem of lithium overcharge and precipitation of the battery when the energy recovery power is used for heating due to the fact that the actual power consumption of the HVH is not obtained is avoided. Fig. 5 is a timing signal control diagram illustrating the timing when the recovered energy control method of the high-pressure heater of the electric vehicle starts heating using the recovered power according to the embodiment of the invention; wherein, regarding the introduction time of the HVH actual power, the HVH actual working state signal is considered, and when the rising edge of the signal is detected, the actual power learned by the HVH rack is considered to be used for distributing the energy recovery power. Specifically, when a driver presses an HVH heating key on an air-conditioning panel, an AC at time t1 sends an HVH opening request to a VCU; after the VCU judges that the whole vehicle meets the condition that HVH starts the whole vehicle to recover power and the high-voltage relay is closed, the VCU sends an HVH enabling signal to the AC at the moment of t 2; the HVH relay is controlled to be closed by the AC, and the HVH feeds back the closed state of the relay at the time t 3; the vehicle controller may consider the power required by the HVH at time T1.
The advancements of the embodiments of the present invention will be described in the following in connection with comparative examples from the reverse side: if power generated by the HVH is introduced at the moment of t1, the actual HVH relay is not closed, and the problem of power overcharge during energy recovery exists at the moment; in addition, if the power generated by the HVH is introduced at the time t2, there are 2 possible situations, the first situation is that the HVH relay is closed to generate power, and there is a problem of insufficient energy recovery utilization rate, the second situation is that the HVH relay is not closed yet, and there is a problem of power overcharge during energy recovery, and the uncertainty of the two situations is compared, and in combination with the reason that the battery does not allow overcharge (lithium deposition), so it is preferable to choose to give up the transient energy recovery utilization rate, and also to choose to introduce the HVH power at the time t 3.
Fig. 6 is a timing signal control diagram illustrating a timing signal for stopping heating using recovered power according to the recovered energy control method of the high-pressure heater of the electric vehicle according to the embodiment of the invention; for the introduction timing of zero power of the HVH, the actual work state of the HVH or an HVH closing request signal should be considered, the two signals should take the falling edge of a detection signal as input, and the actual power consumption of the HVH should be processed by default at 0kw when the falling edge of any one signal is detected.
In fig. 6, if the HVH is self-protected due to high temperature at time T1 and the HVH relay is actively turned off, the power introduced into the HVH at the time T1 should be 0 kw; at this time, if zero power consumption is not introduced, there is a problem that the HVH has not consumed power but the power still introduced within the VCU is not 0, which in turn causes power overcharge during energy recovery. On the other hand, as an example, when the driver presses the HVH heating OFF button on the air conditioner panel, the AC sends an HVH not-on request to the VCU at time T3, the HVH power is required to be introduced at time T2, the HVH relay is turned OFF at time T4 while feeding back the state to be OFF, and the VCU sends an HVH not-enabled command to the AC at time T5.
It should be noted that, although the HVH power introduced at the time t3 in fig. 6 is 0kw, which is a problem of insufficient energy recovery efficiency, that is, the HVH is in the process of opening the relay, compared with the HVH power introduced at the time t4 and t5, which is a problem of power overcharge, the energy recovery efficiency is insufficient and more acceptable, so that the HVH power introduced at the time t3 in fig. 6 may be 0 kw.
In the embodiment of the invention, in the process of heating by distributing the energy recovery power to the HVH, the power introduction time after the HVH is turned on and turned off is controlled, so that the problems can be overcome, and when no HVH controller is arranged, the strategy formulation is carried out on the power introduction time, so that the effect equivalent to the control mode with the HVH controller in the energy recovery can be achieved, and the research and development and production cost is saved.
Embodiments of the present invention also provide a recovered energy control apparatus of an HVH of an electric vehicle, the apparatus being configured to perform the relevant steps in the method of the above embodiments, and the apparatus may be an on-board air conditioning controller and/or a vehicle control unit mentioned in the above embodiments.
As shown in fig. 7, the in-vehicle air conditioning controller 10 according to an embodiment of the present invention includes: the heating request sending unit 701 is used for receiving a heating starting instruction and sending a high-voltage heater starting request to the vehicle control unit based on the heating starting instruction; an enable instruction receiving unit 702 for receiving an enable instruction in response to the high-pressure heater turn-on request from the vehicle control unit; a relay closing triggering unit 703 for triggering to close the high-pressure heater relay based on the enable permission instruction; the recovered power distribution request unit 704 is configured to detect a switching state of the high-voltage heater relay, and send closed state information corresponding to that the high-voltage heater relay is in a closed state to the vehicle control unit, so that the vehicle control unit can distribute power generated by energy recovery to the high-voltage heater based on the closed state information when the electric vehicle is in an energy recovery working condition.
As shown in fig. 8, a vehicle control unit 20 according to an embodiment of the present invention includes: a heating request receiving unit 801 configured to receive a high-pressure heater activation request from an in-vehicle air conditioning controller; a recovered power condition determining unit 802, configured to determine whether a vehicle energy recovered power condition is satisfied based on the high-pressure heater starting request; the enabling instruction sending unit 803 is used for sending an enabling allowing instruction to the vehicle-mounted air conditioner controller to trigger the closing of the high-pressure heater relay when the judgment result indicates that the energy recovery power condition of the whole vehicle is met; a recovered power distribution unit 804 configured to receive closing state information indicating that the high-pressure heater relay is in a closing state from the on-vehicle air conditioner controller, and distribute power generated by energy recovery to the high-pressure heater based on the closing state information.
In some embodiments, the vehicle control unit 20 further includes: a power distribution stopping unit 805 configured to receive an overheat protection instruction from the on-vehicle air conditioning controller, and stop distributing power generated by energy recovery to the high-pressure heater based on the overheat protection instruction.
For more details of the vehicle-mounted air conditioner controller and the vehicle control unit according to the embodiment of the present invention, reference may be made to the above description of the method for controlling recovered energy of the high-voltage heater of the electric vehicle, and the same or corresponding technical effects as those of the method for controlling recovered energy of the high-voltage heater of the electric vehicle may be obtained, so that no further description is provided herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The method for controlling the recovered energy of the high-pressure heater of the electric automobile is characterized by being applied to a vehicle-mounted air conditioner controller, and comprises the following steps:
receiving a heating starting instruction, and sending a high-voltage heater starting request to a vehicle control unit based on the heating starting instruction;
receiving an enable permission instruction from the vehicle control unit in response to the high-pressure heater turn-on request;
triggering to close a high-pressure heater relay based on the enabling permission instruction;
the method comprises the steps of detecting the on-off state of the high-voltage heater relay, and sending closed state information corresponding to the fact that the high-voltage heater relay is in the closed state to a vehicle control unit, so that the vehicle control unit can distribute power generated by energy recovery to the high-voltage heater based on the closed state information when the electric vehicle is in an energy recovery working condition.
2. The method of claim 1, wherein after sending the closed state information corresponding to the high-voltage heater relay being in the closed state to the vehicle controller, the method further comprises:
detecting the heating temperature of the high-pressure heater, and generating an overheat protection instruction according to the heating temperature;
sending the overheating protection command to the vehicle control unit so that the vehicle control unit stops distributing power generated by energy recovery to the high-pressure heater based on the overheating protection command.
3. The method for controlling the recovered energy of the high-voltage heater of the electric automobile is applied to a vehicle control unit, and comprises the following steps:
receiving a high pressure heater turn-on request from a vehicle air conditioner controller;
judging whether the energy recovery power condition of the whole vehicle is met or not based on the starting request of the high-pressure heater;
when the judgment result indicates that the energy recovery power condition of the whole vehicle is met, sending an enabling permission instruction to a vehicle-mounted air conditioner controller for triggering to close a high-pressure heater relay;
and receiving closing state information indicating that the high-pressure heater relay is in a closing state from the vehicle-mounted air conditioner controller, and distributing power generated by energy recovery to the high-pressure heater based on the closing state information.
4. The method for controlling the recovered energy of the high-voltage heater of the electric vehicle according to claim 3, wherein the high-voltage heater starting request comprises a target heating temperature, and wherein the judging whether the energy recovery power condition of the whole vehicle is met comprises:
acquiring the current energy recovery power of the whole vehicle;
analyzing the target heating temperature contained in the high-pressure heater starting request;
determining a target required heating power corresponding to the target heating temperature based on a pre-configured rack data table aiming at the high-pressure heater, wherein the target required heating power is the power to be distributed to the high-pressure heater, and the rack data table comprises a plurality of heating temperatures and a plurality of corresponding required heating powers;
and judging whether the current vehicle energy recovery power condition is met or not according to the vehicle energy recovery power and the target required heating power.
5. The recovered energy control method of an electric vehicle high-pressure heater according to claim 3, wherein after distributing power generated by energy recovery to the high-pressure heater based on the closed state information, the recovered energy control method of an electric vehicle high-pressure heater further comprises:
and receiving an overheating protection instruction from the vehicle-mounted air conditioner controller, and stopping distributing the power generated by energy recovery to the high-pressure heater based on the overheating protection instruction.
6. The recovered energy control method of an electric vehicle high-pressure heater according to claim 3, wherein after distributing power generated by energy recovery to the high-pressure heater based on the closed state information, the recovered energy control method of an electric vehicle high-pressure heater further comprises:
receiving a heating stop instruction, and stopping distribution of power generated by energy recovery to the high-pressure heater based on the heating stop instruction.
7. The method of claim 3, wherein after distributing power generated by energy recovery to the high-pressure heater based on the closed state information, the method further comprises:
distributing power generated by energy recovery to a high-voltage battery pack of the electric vehicle, except for being distributed to the high-voltage heater.
8. An on-vehicle air conditioner controller, characterized in that, on-vehicle air conditioner controller includes:
the heating request sending unit is used for receiving a heating starting instruction and sending a high-voltage heater starting request to the whole vehicle controller based on the heating starting instruction;
an enable instruction receiving unit for receiving an enable permit instruction in response to the high-pressure heater turn-on request from the vehicle control unit;
the relay closing triggering unit is used for triggering and closing the high-pressure heater relay based on the enabling permission instruction;
the recovery power distribution request unit is used for detecting the switching state of the high-voltage heater relay and sending the closing state information corresponding to the closing state of the high-voltage heater relay to the vehicle control unit, so that the vehicle control unit can distribute power generated by energy recovery to the high-voltage heater based on the closing state information when the electric vehicle is in an energy recovery working condition.
9. A vehicle control unit, characterized in that, vehicle control unit includes:
a heating request receiving unit for receiving a high-pressure heater starting request from a vehicle-mounted air conditioner controller;
the recovery power condition judging unit is used for judging whether the energy recovery power condition of the whole vehicle is met or not based on the starting request of the high-pressure heater;
the enabling instruction sending unit is used for sending an enabling allowing instruction to the vehicle-mounted air conditioner controller when the judgment result indicates that the energy recovery power condition of the whole vehicle is met, so as to trigger the closing of the high-pressure heater relay;
and the recovered power distribution unit is used for receiving closed state information used for indicating that the high-pressure heater relay is in a closed state from the vehicle-mounted air conditioner controller and distributing power generated by energy recovery to the high-pressure heater based on the closed state information.
10. The vehicle control unit of claim 9, further comprising:
and the power distribution stopping unit is used for receiving an overheating protection instruction from the vehicle-mounted air conditioner controller and stopping distributing the power generated by energy recovery to the high-pressure heater based on the overheating protection instruction.
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| CN201910083833.1A CN111483287A (en) | 2019-01-29 | 2019-01-29 | Method and device for controlling recovered energy of HVH (high voltage direct current) of electric vehicle |
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| CN201910083833.1A CN111483287A (en) | 2019-01-29 | 2019-01-29 | Method and device for controlling recovered energy of HVH (high voltage direct current) of electric vehicle |
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