CN112977163A - Electric auxiliary brake optimization method and device - Google Patents
Electric auxiliary brake optimization method and device Download PDFInfo
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- CN112977163A CN112977163A CN201911283626.7A CN201911283626A CN112977163A CN 112977163 A CN112977163 A CN 112977163A CN 201911283626 A CN201911283626 A CN 201911283626A CN 112977163 A CN112977163 A CN 112977163A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention provides an electric auxiliary brake optimization method, which comprises the following steps: establishing a mapping relation aiming at the charge condition of the vehicle-mounted battery, wherein the mapping relation comprises a corresponding conversion relation between a first charged state and a second charged state, and the electric quantity range of the first charged state is determined by the electric auxiliary braking requirement; detecting the charge state of the vehicle-mounted battery in real time to obtain a real-time residual electric quantity value reflecting the residual electric quantity of the vehicle-mounted battery; taking the real-time residual electric quantity value as a first charged state to be brought into the mapping relation according to the mapping relation, and obtaining a second charged state corresponding to the real-time residual electric quantity value; and taking the second charged state corresponding to the real-time residual electric quantity value as a display electric quantity value, and displaying the second charged state through the vehicle-mounted instrument and the charger. The electric brake is applied to the new energy automobile in the whole running process, the brake effect is consistent, the running is safer, the battery can be prevented from being overcharged, and the use safety of the battery is ensured.
Description
Technical Field
The invention relates to the technical field of braking, in particular to an electric auxiliary braking optimization method and device.
Background
Because the new energy automobile is driven by a motor and has an electric auxiliary braking function, the electric braking is performed when the opening degree of the front 30% of a brake pedal is the electric braking, but the new energy automobile in the prior art generally does not allow feedback current when the SOC (state of charge) of a battery is in a 100-98% interval after the battery is fully charged, and the automobile is not subjected to electric braking at the moment; the feedback current is not allowed until the SOC of the battery is reduced to be below 98 percent, and the vehicle is not electrically braked at the moment; the situation causes the braking effect of vehicles in different SOC intervals to be different, and a driver can tread the brakes untimely due to the difference of the braking force of the vehicles in the actual driving process, so that traffic accidents can be caused.
In summary, the phenomenon that the feedback current is not allowed after the battery is fully charged in the prior art is very common in the new energy automobile, and the difference of the braking force caused by the phenomenon may cause a large number of traffic accidents.
Therefore, the invention provides an electric auxiliary brake optimization method and device.
Disclosure of Invention
In order to solve the above problems, the present invention provides an electric auxiliary brake optimization method, comprising the steps of:
establishing a mapping relation aiming at the charge condition of the vehicle-mounted battery, wherein the mapping relation comprises a corresponding conversion relation between a first charged state and a second charged state, and the electric quantity range of the first charged state is determined by the electric auxiliary braking requirement;
detecting the charge state of the vehicle-mounted battery in real time to obtain a real-time residual electric quantity value reflecting the residual electric quantity of the vehicle-mounted battery;
taking the real-time residual electric quantity value as the first charged state to be brought into the mapping relation according to the mapping relation, and obtaining a second charged state corresponding to the real-time residual electric quantity value;
and taking the second charged state corresponding to the real-time residual electric quantity value as a display electric quantity value, and displaying the second charged state through the vehicle-mounted instrument and the charger.
According to one embodiment of the invention, the power range satisfies: when the actual electric quantity of the vehicle-mounted battery is within the electric quantity range, the vehicle-mounted battery has feedback current, and when an electric auxiliary braking instruction is received, the electric auxiliary braking is effective.
According to one embodiment of the invention, the mapping relationship comprises a mapping function, which is represented by the following formula:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of said charge range.
According to one embodiment of the invention, the vehicle battery charging strategy is optimized on the basis of the electric auxiliary braking requirement, and during charging, charging is stopped when the actual electric quantity of the vehicle battery reaches the maximum value of the electric quantity range.
According to one embodiment of the invention, the charge range is [0, 98% ] or [0, 99% ].
There is also provided, in accordance with another embodiment of the present invention, apparatus for optimizing electrically assisted braking, the apparatus including:
the mapping establishing module is used for establishing a mapping relation aiming at the charge condition of the vehicle-mounted battery, the mapping relation comprises a corresponding conversion relation between a first charged state and a second charged state, and the electric quantity range of the first charged state is determined by an electric auxiliary braking requirement;
the electric quantity actual measurement module is used for detecting the charge state of the vehicle-mounted battery in real time to obtain a real-time residual electric quantity value reflecting the residual electric quantity of the vehicle-mounted battery;
the mapping calculation module is used for taking the real-time residual electric quantity value as the first charged state to be brought into the mapping relation according to the mapping relation to obtain a second charged state corresponding to the real-time residual electric quantity value;
and the electric quantity display module is used for displaying the second electrified state corresponding to the real-time residual electric quantity value as a display electric quantity value through the vehicle-mounted instrument and the charger.
According to one embodiment of the invention, the mapping establishment module is configured to: the electric quantity range satisfies: when the actual electric quantity of the vehicle-mounted battery is within the electric quantity range, the vehicle-mounted battery has feedback current, and when an electric auxiliary braking instruction is received, the electric auxiliary braking is effective.
According to one embodiment of the invention, the mapping establishment module comprises a mapping function unit comprising the following formula:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of said charge range.
According to one embodiment of the invention, the apparatus further comprises: and the charging optimization module is used for optimizing a charging strategy of the vehicle-mounted battery based on the electric auxiliary braking requirement, and stopping charging when the actual electric quantity of the vehicle-mounted battery reaches the maximum value of the electric quantity range in the charging process.
According to one embodiment of the invention, the mapping establishment module is configured to: the electric quantity range is [0, 98% ] or [0, 99% ].
The method and the device for optimizing the electric auxiliary braking establish the mapping relation of the charge condition of the vehicle-mounted battery, ensure that the electric auxiliary braking of the vehicle is effective in a complete discharge interval range, solve the problem of inconsistent braking effects of different SOC intervals commonly existing at present, enable the new energy automobile to have the electric braking in the whole driving process, have consistent braking effect and run more safely; and the battery can be prevented from being overcharged, and the use safety of the battery is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow diagram of a method for electrical assist brake optimization according to an embodiment of the invention;
FIG. 2 is a diagram illustrating a mapping relationship according to an embodiment of the invention;
FIG. 3 shows a flow chart of a method of electrical assist brake optimization according to another embodiment of the present invention; and
FIG. 4 shows a block diagram of an electric assist brake optimization apparatus in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
At present, in the market of commercial vehicles, particularly the market of new energy vehicles, an instrument or a charger displays the real residual electric quantity of a battery, and the real residual electric quantity is used for reflecting the use state or the charging state of the battery; in addition, new energy vehicles generally have electric auxiliary braking for auxiliary braking of the vehicle.
However, one problem that is common today is: in order to prevent the overcharge of the battery, a battery manufacturer sets that the SOC of the battery has no feedback current in a range of 98% -100%, although the problem of the overcharge of the battery is solved to a certain extent, another problem is brought.
Because, in order to solve the problems of battery overcharge and electric auxiliary braking at the same time, the invention provides an electric auxiliary braking optimization method, which comprises the following steps:
FIG. 1 shows a flow diagram of a method for electrical assist brake optimization according to one embodiment of the present invention.
As shown in fig. 1, in step S101, a mapping relation for the vehicle-mounted battery charge condition is established, where the mapping relation includes a corresponding conversion relation between a first charged state and a second charged state, and an electric quantity range of the first charged state is determined by an electric auxiliary braking requirement.
Generally, in order to enable the vehicle to have an electric auxiliary braking function in the whole battery discharging process and maintain consistent braking effect, the electric quantity range needs to meet the following requirements: when the actual electric quantity of the vehicle-mounted battery is within the electric quantity range, the vehicle-mounted battery has feedback current, and when an electric auxiliary braking instruction is received, the electric auxiliary braking is effective.
In practical use, the electric quantity range can be set to 0, 98% or 0, 99%, because in the above two intervals, the vehicle has feedback current, which can ensure the effect of the auxiliary electric brake. In another embodiment, the maximum value of the first charged state may be any value between 98% and 99%. It should be noted that, according to practical situations, other power ranges can also be applied to the present invention, and the present invention is not limited thereto.
As shown in fig. 1, in step S102, the state of charge of the vehicle-mounted battery is detected in real time, and a real-time remaining power value reflecting the remaining power of the vehicle-mounted battery is obtained. Generally, a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS for short) can accurately estimate the SOC of a BATTERY, ensure that the SOC is maintained within a reasonable range, and display the remaining capacity of a vehicle BATTERY at any time. Therefore, the state of charge of the vehicle-mounted battery can be detected in real time through the battery management system, and a real-time residual electric quantity value is obtained.
As shown in fig. 1, in step S103, the real-time remaining electric quantity value is taken as a first charged state and brought into the mapping relationship according to the mapping relationship, so as to obtain a second charged state corresponding to the real-time remaining electric quantity value.
Specifically, the mapping relationship includes a mapping function, and the mapping function is expressed by the following formula:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of the range of electric quantities.
For example, assuming the current battery real-time remaining charge value is 49%, by bringing 49% to SOC1, SOCmaxWhen the value is 98%, the SOC2 is equal to 50% through calculation, namely the remaining battery capacity of 50% can be displayed on an instrument or a charger.
As shown in fig. 1, in step S104, the second charging state corresponding to the real-time residual electric quantity value is used as a display electric quantity value, and is displayed through the vehicle-mounted instrument and the charger.
In addition, a vehicle-mounted battery charging strategy can be optimized based on the electric auxiliary braking requirement, and in the charging process, when the actual electric quantity of the vehicle-mounted battery reaches the maximum value of the electric quantity range, the charging is stopped.
In conclusion, the electric auxiliary brake optimization method provided by the invention simultaneously solves the problems of battery overcharge and electric auxiliary brake, keeps the consistency of brake effect and improves the driving safety.
Fig. 2 shows a mapping relationship diagram according to an embodiment of the invention.
As shown in fig. 2, SOC1 represents the first charged state, i.e. the real remaining capacity of the battery, and in order to meet the requirement of electric auxiliary braking, it is necessary to ensure that the real capacity of the battery does not exceed 98% -99% during the whole charging/discharging process of the battery. The purpose of the arrangement is that the current common solution for the problem of battery overcharge is to arrange that no feedback current exists in the 98% -100% or 99% -100% electric quantity interval of the battery, so that the electric auxiliary brake is ineffective in the interval. In the present invention, in order to avoid the problem that the battery does not have a feedback current in the 98% -100% or 99% -100% charge range and to avoid the problem of overcharging the battery, the charge range of the first charged state is set to [0, 98% ] or [0, 99% ].
Of course, the electric quantity range of the first charged state can be changed according to practical situations, but the change criterion still needs to meet the requirement of electric auxiliary braking, and the change of the electric quantity range of the first charged state under the criterion can also be applied to the embodiment of the invention, and the invention does not limit the electric quantity range.
As shown in fig. 2, SOC2 represents a second state of charge, i.e., the displayed charge of the battery, which refers to the battery charge displayed on the vehicle meter or charger. In order to enable a user to know the residual electric quantity of the battery more conveniently and visually, the residual electric quantity needs to be displayed through an instrument and a charger. The electric quantity range of the second charged state is 0-100%, and the problem that a user thinks that the battery is not fully charged is solved.
The first charging state and the second charging state are defined to reflect the charging state of the vehicle battery, and in order to link the first charging state and the second charging state, the invention establishes a mapping relation between the first charging state and the second charging state.
Specifically, a conversion formula, namely a mapping function, of the two is established through the value ranges of the two, the electric auxiliary braking requirement and the requirement for preventing the battery from being overcharged, and the following formula is shown:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of the range of electric quantities.
For example, during charging, the charging can be stopped when the actual charge of the battery reaches the maximum value of the charge range of SOC1, and since the maximum value of the charge range of SOC1 is typically 98% or 99%, which is less than 100%, the occurrence of overcharge of the battery can be prevented. In addition, in the whole discharging process of the battery, because feedback current exists all the time, the electric brake can be ensured to be effective all the time, and the consistency of the brake effect is maintained.
By establishing the mapping relation shown in fig. 2, when the battery displays full charge (SOC2 is 100%), the actual SOC1 is 98% or 99%, overcharge is prevented, the battery allows a feedback current, and the vehicle is electrically braked, and when the battery temperature and the cell voltage are normal, the electric brake effect can be ensured to be consistent when the SOC2 is displayed at 100% -0%.
Specifically, if the battery is in a low temperature and the cell voltage is too high, the vehicle electric brake feedback can not be performed, so that the battery temperature and the cell voltage condition also need to be detected in real time, generally, the cell voltage and cell range needs to be less than 3.5V, and the temperature is in a normal range between 10 ℃ and 40 ℃.
FIG. 3 shows a flow chart of a method for electrical assist brake optimization according to another embodiment of the present invention.
As shown in fig. 3, in step S301, a real-time residual electric quantity value is detected. Specifically, the remaining capacity value of the vehicle battery may be detected in real time by a battery management system BMS on the vehicle.
Then, in step S302, the mapping relationship is brought in. Specifically, the detected residual electric quantity value may be brought into the mapping relationship as the first charging state, and then the corresponding second charging state is calculated by the mapping function in step S303.
The mapping function is as follows:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of the range of electric quantities.
Finally, in step S304, the electric quantity is displayed as a display electric quantity value. Specifically, the calculated second electrification state is displayed as a display electric quantity value.
In one embodiment, the real-time remaining charge value of the vehicle battery is detected as 49% by the battery management system BMS, and then 49% is brought into the mapping function as the first charged state, and the SOC is obtained by the querymaxThe value is 98%. The corresponding second charged state is 50%, and 50% is displayed as the display electric quantity value.
FIG. 4 shows a block diagram of an electric assist brake optimization apparatus in accordance with an embodiment of the present invention. As shown in fig. 4, the optimization apparatus 400 includes a mapping establishing module 401, an electric quantity measuring module 402, a mapping calculating module 403, and an electric quantity displaying module 404.
The mapping establishing module 401 is configured to establish a mapping relationship for a charge condition of the vehicle-mounted battery, where the mapping relationship includes a corresponding conversion relationship between a first charged state and a second charged state, and an electric quantity range of the first charged state is determined by an electric auxiliary braking requirement.
Specifically, the mapping setup module is configured to: the electric quantity range satisfies: when the actual electric quantity of the vehicle-mounted battery is within the electric quantity range, the vehicle-mounted battery has feedback current, and when an electric auxiliary braking instruction is received, the electric auxiliary braking is effective.
Further, the mapping establishing module comprises a mapping function unit, and the mapping function unit comprises the following formula:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of the range of electric quantities.
Specifically, the electric quantity range of the first charged state is [0, 98% ] or [0, 99% ].
The electric quantity actual measurement module 402 is used for detecting the charge state of the vehicle-mounted battery in real time to obtain a real-time residual electric quantity value reflecting the residual electric quantity of the vehicle-mounted battery.
The mapping calculation module 403 is configured to take the real-time remaining electric quantity value as a first charged state to be brought into the mapping relationship according to the mapping relationship, so as to obtain a second charged state corresponding to the real-time remaining electric quantity value.
The electric quantity display module 404 is configured to display the second charged state corresponding to the real-time residual electric quantity value as a display electric quantity value through the vehicle-mounted instrument and the charger.
In addition, the optimization device 400 further includes a charging optimization module for optimizing the charging strategy of the vehicle-mounted battery based on the electric auxiliary braking requirement, and stopping charging when the actual electric quantity of the vehicle-mounted battery reaches the maximum value of the electric quantity range during charging.
In conclusion, the electric auxiliary brake optimization method and device provided by the invention establish the mapping relation of the charge condition of the vehicle-mounted battery, ensure that the electric auxiliary brake of the vehicle is effective in a complete discharge interval range, solve the problem of inconsistent brake effects of different SOC intervals commonly existing at present, ensure that the new energy automobile has electric brake in the whole driving process, have consistent brake effect and run more safely; and the battery can be prevented from being overcharged, and the use safety of the battery is ensured.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An electric assisted brake optimization method, comprising the steps of:
establishing a mapping relation aiming at the charge condition of the vehicle-mounted battery, wherein the mapping relation comprises a corresponding conversion relation between a first charged state and a second charged state, and the electric quantity range of the first charged state is determined by the electric auxiliary braking requirement;
detecting the charge state of the vehicle-mounted battery in real time to obtain a real-time residual electric quantity value reflecting the residual electric quantity of the vehicle-mounted battery;
taking the real-time residual electric quantity value as the first charged state to be brought into the mapping relation according to the mapping relation, and obtaining a second charged state corresponding to the real-time residual electric quantity value;
and taking the second charged state corresponding to the real-time residual electric quantity value as a display electric quantity value, and displaying the second charged state through the vehicle-mounted instrument and the charger.
2. The method of claim 1, wherein the charge range satisfies: when the actual electric quantity of the vehicle-mounted battery is within the electric quantity range, the vehicle-mounted battery has feedback current, and when an electric auxiliary braking instruction is received, the electric auxiliary braking is effective.
3. The method of claim 2, wherein the mapping relationship comprises a mapping function, the mapping function being represented by the formula:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of said charge range.
4. A method according to any of claims 1-3, characterized in that the on-board battery charging strategy is optimized on the basis of electric auxiliary braking requirements, and during charging is stopped when the actual charge of the on-board battery reaches the maximum value of said charge range.
5. The method of claim 1, wherein the charge level range is [0, 98% ] or [0, 99% ].
6. An electric assist brake optimization apparatus, comprising:
the mapping establishing module is used for establishing a mapping relation aiming at the charge condition of the vehicle-mounted battery, the mapping relation comprises a corresponding conversion relation between a first charged state and a second charged state, and the electric quantity range of the first charged state is determined by an electric auxiliary braking requirement;
the electric quantity actual measurement module is used for detecting the charge state of the vehicle-mounted battery in real time to obtain a real-time residual electric quantity value reflecting the residual electric quantity of the vehicle-mounted battery;
the mapping calculation module is used for taking the real-time residual electric quantity value as the first charged state to be brought into the mapping relation according to the mapping relation to obtain a second charged state corresponding to the real-time residual electric quantity value;
and the electric quantity display module is used for displaying the second electrified state corresponding to the real-time residual electric quantity value as a display electric quantity value through the vehicle-mounted instrument and the charger.
7. The apparatus of claim 6, wherein the mapping establishment module is configured to: the electric quantity range satisfies: when the actual electric quantity of the vehicle-mounted battery is within the electric quantity range, the vehicle-mounted battery has feedback current, and when an electric auxiliary braking instruction is received, the electric auxiliary braking is effective.
8. The apparatus of claim 7, wherein the mapping establishment module comprises a mapping function unit comprising the following formula:
wherein SOC2 represents the second charged state, SOC1 represents the first charged state, SOCmaxRepresenting the maximum value of said charge range.
9. The apparatus of any one of claims 6-8, further comprising: and the charging optimization module is used for optimizing a charging strategy of the vehicle-mounted battery based on the electric auxiliary braking requirement, and stopping charging when the actual electric quantity of the vehicle-mounted battery reaches the maximum value of the electric quantity range in the charging process.
10. The apparatus of claim 6, wherein the mapping establishment module is configured to: the electric quantity range is [0, 98% ] or [0, 99% ].
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