CN110871798A - Vehicle control system, method, device and equipment - Google Patents

Vehicle control system, method, device and equipment Download PDF

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Publication number
CN110871798A
CN110871798A CN201810987278.0A CN201810987278A CN110871798A CN 110871798 A CN110871798 A CN 110871798A CN 201810987278 A CN201810987278 A CN 201810987278A CN 110871798 A CN110871798 A CN 110871798A
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China
Prior art keywords
battery
interval
derating
stop
state
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Granted
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CN201810987278.0A
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CN110871798B (en
Inventor
S·格伦德曼
冯琦峰
张帆
孙子翼
陈勇
查冠明
E·吴
徐淑芳
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to CN201810987278.0A priority Critical patent/CN110871798B/en
Priority claimed from CN201810987278.0A external-priority patent/CN110871798B/en
Priority to EP19765188.8A priority patent/EP3844381A1/en
Priority to PCT/EP2019/072963 priority patent/WO2020043775A1/en
Publication of CN110871798A publication Critical patent/CN110871798A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0825—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18018—Start-stop drive, e.g. in a traffic jam
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
    • 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]
    • 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
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/25—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by controlling the electric load
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/549—Current
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/244—Charge state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/246—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
    • F02N2200/061—Battery state of charge [SOC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
    • F02N2200/064—Battery temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2300/00—Control related aspects of engine starting
    • F02N2300/20—Control related aspects of engine starting characterised by the control method
    • F02N2300/2008—Control related aspects of engine starting characterised by the control method using a model
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2300/00—Control related aspects of engine starting
    • F02N2300/30—Control related aspects of engine starting characterised by the use of digital means
    • F02N2300/302—Control related aspects of engine starting characterised by the use of digital means using data communication
    • F02N2300/304—Control related aspects of engine starting characterised by the use of digital means using data communication with other systems inside the vehicle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

The invention relates to a vehicle control system, a method, a device and equipment, wherein the method comprises the following steps: detecting whether the state of a battery of a vehicle start-stop system is higher than a preset threshold value; and in response to detecting that the state of the battery is above the predetermined threshold, disabling an automatic start stop function of an engine, wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery is not above the upper limit of the derated interval after the engine performs at least one automatic start stop function. By using the vehicle control device, method and system, the fuel economy and competitive advantages can be improved compared with the existing system.

Description

Vehicle control system, method, device and equipment
Technical Field
The invention relates to the technical field of vehicle control, in particular to a vehicle control system, method, device and equipment.
Background
In view of the increasing importance of environmental protection in various countries and the increasing requirements on vehicle fuel consumption and emission standards, electric vehicles and hybrid electric vehicles will be the mainstream of future development, and vehicles have an automatic start-stop function and will help to reduce fuel consumption. The automatic start-stop system is a set of system which automatically stops the engine when the vehicle stops temporarily (such as traffic jam or waiting for a red light) in the running process, and automatically restarts the engine when the vehicle needs to go forward continuously. The core of the system is that flameout and starting are automatically controlled, unnecessary fuel consumption is reduced, emission is reduced, and fuel economy is improved. The function is mainly suitable for waiting for signal lamps or stopping in urban traffic, and the idling time of the engine can be reduced as much as possible.
In order to prevent a 48V battery for a vehicle start stop system from reaching a safety critical state and from prematurely aging, a Battery Management System (BMS) design includes consideration of both battery temperature and IrmsDerating strategy of (1). During such derating events, for example, at high battery temperatures or continuous high current events, the allowable discharge current and discharge power become small and therefore do not meet the capability of the engine to generate automatic start stop events. Accordingly, the engine needs to be continuously idling, which increases fuel consumption.
Disclosure of Invention
In view of the above problems of the prior art, embodiments of the present invention provide vehicle control systems, methods, devices and apparatus that can improve fuel economy and reduce emissions.
A vehicle control system according to an embodiment of the invention includes: a battery monitoring unit and a start-stop controller. The battery monitoring unit is configured to detect whether a state of a battery of the vehicle start-stop system is above a predetermined threshold. The start-stop controller is in communication with the battery monitoring unit via a Controller Area Network (CAN) bus and is configured to disable an automatic start-stop function of an engine in response to detecting that the state of the battery is above the predetermined threshold. Wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval.
A vehicle control method according to an embodiment of the invention includes: detecting whether the state of a battery of a vehicle start-stop system is higher than a preset threshold value; and in response to detecting that the state of the battery is above the predetermined threshold, disabling an automatic start stop function of an engine, wherein the predetermined threshold is greater than a lower limit of a derating interval of the battery and less than an upper limit of the derating interval of the battery such that the state of the battery is not above the upper limit of the derating interval after the engine performs at least one automatic start stop function.
A vehicle control apparatus according to an embodiment of the invention includes: the device comprises a battery monitoring module and a start-stop control module. The battery monitoring module is used for detecting whether the state of a battery of the vehicle start-stop system is higher than a preset threshold value. The start-stop control module is to disable an automatic start-stop function of an engine in response to detecting that the state of the battery is above the predetermined threshold. Wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval.
A vehicle control apparatus according to an embodiment of the invention includes: a processor; and a memory having executable instructions stored thereon, wherein the executable instructions, when executed, cause the processor to perform the aforementioned method.
A machine-readable storage medium according to an embodiment of the invention has stored thereon executable instructions, wherein the executable instructions, when executed, cause a machine to perform the aforementioned method.
As can be seen from the above, the solution of the embodiment of the present invention still allows the automatic start-stop function of the engine during the derating of the battery, instead of prohibiting the automatic start-stop function of the engine, and therefore, it is expected to contribute to fuel saving as compared with the prior art.
Drawings
The features, characteristics, advantages and benefits of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 shows a schematic diagram of the thermal derating of a battery.
Fig. 2 shows a schematic diagram of the rms current de-rating.
Fig. 3A-3B show simulation experiments for 10 start-stop cycles starting from a standstill of t-0 s.
FIG. 4 shows a schematic diagram of a vehicle control system 400 according to an embodiment of the invention.
FIG. 5 shows a flow diagram of a vehicle control method 500 according to one embodiment of the invention.
Fig. 6 shows a schematic diagram of a vehicle control device 600 according to an embodiment of the invention.
Fig. 7 shows a schematic diagram of a vehicle control apparatus 700 according to an embodiment of the invention.
Detailed Description
The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thereby implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as needed. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to some examples may also be combined in other examples.
As used herein, the term "include" and its variants mean open-ended terms in the sense of "including, but not limited to. The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first," "second," and the like may refer to different or the same object. Other definitions, whether explicit or implicit, may be included below. The definition of a term is consistent throughout the specification unless the context clearly dictates otherwise.
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Currently, there are two derating strategies for a 48V battery vehicle start-stop system:
1. the heat derating strategy comprises the following steps: according to the battery temperature, preventing the battery of the vehicle start-stop system from reaching a safety critical temperature; and
2. root Mean Square (RMS) current derating strategy: root mean square current (or Irms) is used to prevent premature aging of the battery, relays and fuses of the vehicle start stop system.
Both derating strategies are described in detail below.
1. Thermal derating strategy
The predicted maximum charge or discharge current is from the maximum allowable current I when the battery temperature enters a thermal derating range, for example, from 65.3 ℃ to 68.8 ℃maxLinearly down to 0A as shown in fig. 1. This derating strategy is part of the power prediction and is intended to avoid the battery of the vehicle start stop system reaching a critical state. Therefore, operating the battery in the above-specified temperature range results in a decrease in performance thereof.
2. Root Mean Square (RMS) current derating strategy
As another derating strategy, the BMS also monitors the rms current of the battery and takes this into account when calculating the predicted current, as shown in fig. 2. The RMS current monitoring is done by comparing the integral of the squared current with the integral of the RMS current threshold, which is expressed as:
Figure BDA0001779981910000041
this basic formula is used to observe the absolute (charge and discharge) current, and only the charge current. RMS current threshold (I)Lim) Derived from the battery, relay and fuse characteristics of the temperature dependent vehicle start stop system. The time constant of the RMS current threshold integral (τ) is 170s for absolute current and 120s for charging current. If the integral of the battery current over time is higher than the integral of the RMS current threshold, a long term over-current fault may be triggered and the relay may be opened. Note that RMS current is a function of current and time, not instantaneous current.
During the above derating event, conventional vehicle start stop systems do not allow the automatic start stop function of the engine to be initiated. However, the inventors conducted simulation experiments in order to determine whether the engine can still enable the automatic start-stop function when the battery of the vehicle start-stop system is in the derated interval, i.e. neglecting the current limitation due to the thermal derating of the automatic start-stop.
Specifically, the simulation experiment employed the BMS control software a30SW combined with a battery model and a thermal model and start-stop current profiles obtained from actual vehicles, wherein the boundary condition was the driving environment temperature T Environment(s)40 ℃ (simulated high temperature environment bin), variables include initial battery temperature TBattery initialInitial state of charge SOCInitial(10% -90%) and the waiting time t between two start-stop cyclesWait for。
The simulation experiment takes into account two situations: 1. starting the vehicle from a static time t equal to 0s for 10 start-stop periods; 2. the vehicle was run for 10 start-stop cycles starting at the last 400s of the new european driving regime (NEDC). Wherein t in both casesWait forAll 1s (i.e., continuous start-up and shut-down at 1s intervals); for the first case, TBattery initial＝68℃，SOC Initial10% and 90%, respectively (with highest and lowest discharge conditions, respectively); for the second case, TBattery initial＝64℃，SOC Initial10% (worst case). Fig. 3A-3B show simulation experimental results for a first case of 10 start-stop cycles starting from standstill t ═ 0 s. From the simulation experiment results, the temperature rise of the battery of the vehicle start-stop system is about 0.02 ℃ caused by the start-stop period of each time the vehicle runs; however, even 300 test start-stop cycles did not reach battery IrmsAnd (4) limiting values. The results of the simulation experiment for the second case lead to the same conclusions (not shown). Experiments show that: the idea of allowing an automatic start-stop function of the engine during a battery under thermal derate is feasible at the system level.
FIG. 4 shows a schematic diagram of a vehicle control system 400 according to an embodiment of the invention. The vehicle control system 400 may include a battery monitoring unit 402 and a start-stop controller 404 in communication with the battery monitoring unit 402 via a can bus. The battery monitoring unit 402 is configured to detect whether the state of a battery of a vehicle start stop system (not shown) is above a predetermined threshold. The state includes a temperature and/or a root mean square current of the battery. Other states of the battery are also contemplated by those skilled in the art, as long as they can be used to control the automatic start stop function of the engine. Preferably, the battery monitoring unit 402 comprises a temperature sensor for measuring the temperature T of the battery of the vehicle start stop system and a current sensor for measuring the current I of said battery. The battery monitoring unit 402 may calculate I from the detected battery currentrms. Preferably, the battery is a 48 volt battery. However, those skilled in the art will appreciate that other voltages for the battery may be used in the vehicle start stop system.
The start-stop controller 404 is configured to disable an automatic start-stop function of an engine (not shown) in response to detecting that the state of the battery is above the predetermined threshold. For example, the vehicle control system 400 is suitable for an engine having a warm start condition of 100A-150A for 250 ms-500 ms. Since the predetermined threshold is greater than the lower limit of the derated interval of the battery, if the state of the battery is higher than the lower limit of the derated interval of the battery although it is lower than the predetermined threshold, the start-stop controller 404 according to an embodiment of the present invention may still allow the automatic start-stop function of the engine. Preferably, the predetermined threshold is greater than a lower limit of a derating interval of the battery and less than an upper limit of the derating interval of the battery, such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derating interval. In this case, on the contrary, the conventional vehicle start-stop system disables the automatic start-stop function of the engine. Thus, the solution of the embodiment of the invention improves the fuel economy of the vehicle and reduces emissions compared to conventional systems.
As previously described, there are respective derating intervals for thermal derating and RMS current derating. It can be seen from figure 2 that the temperature intervals for the thermal derate and the RMS current derate are substantially the same. Therefore, the battery monitoring unit 402 preferably detects whether the temperature of the battery of the vehicle start-stop system is above a predetermined temperature threshold. Thus, the derating interval comprises at least a thermal derating interval, wherein the predetermined temperature threshold is greater than a lower limit of the thermal derating interval and less than an upper limit of the thermal derating interval, such that the state of the battery after the engine has performed at least one automatic start-stop function is not higher than the upper limit of the derating interval, preferably such that the state of the battery after the engine has performed at least ten automatic start-stop functions is not higher than the upper limit of the derating interval. For example, the thermal derating interval is 65.3-68.8 ℃ for a particular type of vehicle. Thus, the predetermined temperature threshold may be set within a heat derating interval between 65.3 ℃ and 68.8 ℃. Those skilled in the art will appreciate how to set the predetermined temperature threshold for the thermal derating interval for other types of vehicles.
In addition, simulation experiments show that continuous starting and stopping at intervals of 1s can cause the temperature rise of the battery to be 0.02 ℃ more. For safety and lifetime of the battery, according to an embodiment of the present invention, the predetermined temperature threshold is preferably set to 68.5 ℃. It should be appreciated that a balance is sought between fuel economy and battery safety and life, and that the predetermined temperature threshold may be set to other values greater than or less than 68.5 ℃ so long as the state of the battery after the engine has performed at least one automatic start-stop function is not above the upper limit of the derating interval.
FIG. 5 shows a flow diagram of a vehicle control method 500 according to one embodiment of the invention. The vehicle control method 500 of FIG. 5 is described in detail below in conjunction with the battery monitoring unit 402 and the start-stop controller 404 shown in FIG. 4.
As shown in FIG. 5, at block 502, it is detected whether the state of the battery of the vehicle start stop system is above a predetermined threshold. This step may be performed, for example, by the battery monitoring unit 402 in fig. 4.
In response to detecting that the state of the battery is above the predetermined threshold, an automatic start stop function of the engine is disabled in block 504. This step may be performed, for example, by the start-stop controller 404 in FIG. 4.
Wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval. Preferably, in block 502, it may be detected in particular whether the temperature of the battery of the vehicle start-stop system is above a predetermined temperature threshold, such that the state of the battery is not above the upper limit of the derated interval after the engine has performed at least one automatic start-stop function, preferably such that the state of the battery is not above the upper limit of the derated interval after the engine has performed at least ten automatic start-stop functions. In this case, the derated interval comprises a thermal derated interval. The predetermined temperature threshold is set within a heat derating interval between 65.3-68.8 ℃, preferably the predetermined temperature threshold is set at 68.5 ℃.
Fig. 6 shows a schematic diagram of a vehicle control device 600 according to another embodiment of the invention. The vehicle control apparatus 600 shown in fig. 6 may be implemented by software, hardware, or a combination of software and hardware. The vehicle control apparatus 600 shown in fig. 6 may be installed in the start-stop controller 404 of the vehicle control system 400, for example.
As shown in fig. 6, the vehicle control apparatus 600 includes a battery monitoring module 602 and a start-stop control module 604. The battery monitoring module 602 is configured to detect whether a state of a battery of the vehicle start-stop system is higher than a predetermined threshold. The start stop control module 604 is configured to disable an automatic start stop function of the engine in response to detecting that the state of the battery is above the predetermined threshold. Wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval.
In one aspect, the battery monitoring module is further configured to detect whether a temperature of the battery of the vehicle start-stop system is above a predetermined temperature threshold such that the state of the battery is not above the upper limit of the derated interval after the engine performs at least one automatic start-stop function, and preferably such that the state of the battery is not above the upper limit of the derated interval after the engine performs at least ten automatic start-stop functions, wherein the derated interval comprises a thermal derated interval. The predetermined temperature threshold is set within a heat derating interval between 65.3-68.8 ℃, preferably the predetermined temperature threshold is set at 68.5 ℃.
Fig. 7 shows a schematic diagram of a vehicle control apparatus 700 according to an embodiment of the invention. As shown in fig. 7, the vehicle control apparatus 700 may include a processor 702 and a memory 704. The memory 704 has stored thereon executable instructions that, when executed, cause the processor 702 to perform the method 500 shown in fig. 5. The vehicle control apparatus 700 may be realized by, for example, the start-stop controller 404.
There is also provided, in accordance with an embodiment of the present invention, a machine-readable storage medium having stored thereon executable instructions, wherein the executable instructions, when executed, cause a machine to perform the method 500 illustrated in fig. 5.
It should be noted that the present invention proposes only to allow the automatic start stop function of the engine when the battery state of the vehicle start stop system is not higher than a predetermined threshold, but does not allow the power assist and energy recovery functions.
The detailed description set forth above in connection with the appended drawings describes exemplary embodiments but does not represent all embodiments that may be practiced or fall within the scope of the claims. The term "exemplary" used throughout this specification means "serving as an example, instance, or illustration," and does not mean "preferred" or "advantageous" over other embodiments. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described embodiments.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (11)

1. A vehicle control system (400), comprising:
a battery monitoring unit (402) configured to detect whether a state of a battery of the vehicle start-stop system is above a predetermined threshold; and
a start-stop controller (404) in communication with the battery monitoring unit (402) over a CAN bus and configured to disable an automatic start-stop function of an engine in response to detecting that the state of the battery is above the predetermined threshold,
wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval.
2. The vehicle control system (400) of claim 1,
wherein the battery monitoring unit (402) is further configured to detect whether a temperature of the battery of the vehicle start stop system is above a predetermined temperature threshold, and
wherein the derating interval comprises a thermal derating interval and the predetermined temperature threshold is greater than a lower limit of the thermal derating interval and less than an upper limit of the thermal derating interval such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derating interval, preferably such that the state of the battery after the engine performs at least ten automatic start-stop functions is not higher than the upper limit of the derating interval.
3. The vehicle control system (400) of claim 2,
the predetermined temperature threshold is set within a heat derating interval between 65.3-68.8 ℃, preferably the predetermined temperature threshold is set at 68.5 ℃.
4. A vehicle control method (500), comprising:
detecting whether the state of a battery of a vehicle start-stop system is higher than a predetermined threshold (502); and is
Disabling an automatic start stop function of an engine in response to detecting that the state of the battery is above the predetermined threshold (504),
wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery, such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval, preferably such that the state of the battery after the engine performs at least ten automatic start-stop functions is not higher than the upper limit of the derated interval.
5. The vehicle control method (500) of claim 4,
wherein the step of detecting comprises detecting whether a temperature of the battery of the vehicle start stop system is above a predetermined temperature threshold, and
wherein the derating interval comprises a thermal derating interval and the predetermined temperature threshold is greater than a lower limit of the thermal derating interval and less than an upper limit of the thermal derating interval such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derating interval, preferably such that the state of the battery after the engine performs at least ten automatic start-stop functions is not higher than the upper limit of the derating interval.
6. The vehicle control method (500) of claim 5,
the predetermined temperature threshold is set within a heat derating interval between 65.3-68.8 ℃, preferably the predetermined temperature threshold is set at 68.5 ℃.
7. A vehicle control apparatus (600) comprising:
a battery monitoring module (602) for detecting whether a state of a battery of the vehicle start-stop system is above a predetermined threshold; and
a start-stop control module (604) for disabling an automatic start-stop function of an engine in response to detecting that the state of the battery is above the predetermined threshold,
wherein the predetermined threshold is greater than a lower limit of a derated interval of the battery and less than an upper limit of the derated interval of the battery such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derated interval.
8. The vehicle control apparatus (600) according to claim 7,
wherein the battery monitoring module is further configured to detect whether a temperature of the battery of the vehicle start-stop system is above a predetermined temperature threshold, and
wherein the derating interval comprises a thermal derating interval and the predetermined temperature threshold is greater than a lower limit of the thermal derating interval and less than an upper limit of the thermal derating interval such that the state of the battery after the engine performs at least one automatic start-stop function is not higher than the upper limit of the derating interval, preferably such that the state of the battery after the engine performs at least ten automatic start-stop functions is not higher than the upper limit of the derating interval.
9. The vehicle control apparatus (600) according to claim 8,
the predetermined temperature threshold is set within a heat derating interval between 65.3-68.8 ℃, preferably the predetermined temperature threshold is set at 68.5 ℃.
10. A vehicle control apparatus (700), comprising:
a processor (702); and
a memory (704) having executable instructions stored thereon, wherein the executable instructions, when executed, cause the processor to perform the method of any of claims 4-6.
11. A machine readable storage medium having stored thereon executable instructions, wherein the executable instructions, when executed, cause a machine to perform the method of any of claims 4-6.
CN201810987278.0A 2018-08-28 2018-08-28 Vehicle control system, method, device and equipment Active CN110871798B (en)

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EP19765188.8A EP3844381A1 (en) 2018-08-28 2019-08-28 Vehicle control system, method, apparatus and device
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