WO2014166852A2 - System and method for managing battery of vehicle - Google Patents

System and method for managing battery of vehicle Download PDF

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Publication number
WO2014166852A2
WO2014166852A2 PCT/EP2014/056895 EP2014056895W WO2014166852A2 WO 2014166852 A2 WO2014166852 A2 WO 2014166852A2 EP 2014056895 W EP2014056895 W EP 2014056895W WO 2014166852 A2 WO2014166852 A2 WO 2014166852A2
Authority
WO
WIPO (PCT)
Prior art keywords
battery
engine
generator
vehicle
driving
Prior art date
Application number
PCT/EP2014/056895
Other languages
French (fr)
Other versions
WO2014166852A3 (en
Inventor
Jinwoo Song
Byungjin Kim
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2014166852A2 publication Critical patent/WO2014166852A2/en
Publication of WO2014166852A3 publication Critical patent/WO2014166852A3/en

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Classifications

    • 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
    • B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B60L15/2045—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for optimising the use of energy
    • 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
    • B60L50/15—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with additional electric power supply
    • 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
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • 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
    • Y02T10/64—Electric machine technologies in electromobility
    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • the present invention relates to a system and method for managing the battery of a vehicle, and more particularly to a system and method for recharging the battery discharged at a predetermined time after parking a vehicle with the engine stopped .
  • the electric source of a vehicle is obtained by using a generator to charge the electric load and battery with the power (the product of voltage and current) . If the electric load is too great to supply with the power of the generator, the power of the battery is used to supply the electric load.
  • the generator In a system where the generator is not controlled to produce electricity, the generator usually keeps on generating a given voltage, thus unnecessarily consuming fuel.
  • a system of variable voltage generation began to be used which intensively operates the generator when cutting off fuel for decreasing the speed of the vehicle, and minimizes the electricity produced by the generator when the vehicle is idled, driven at a constant speed, or with an acceleration.
  • Fig. 1 represents correlation of the vehicle speed (a), the voltage produced by the generator (b) , and the amount of the fuel injection (c) with reference to the time axis.
  • a battery sensor is added to detect/calculate the amount of current flowing in or out of the battery, the liquid temperature of the battery, the voltage of the battery, etc. to generate a signal, and to calculate/output the charge rate of the battery by means of charge accumulation based on the current amount received.
  • the vehicle provided with the system cuts off fuel and sets the voltage produced by the generator as high when decreasing the vehicle speed with the acceleration pedal released .
  • a control is made to stop or minimize the operation of the generator so as to minimize the load (electric generation load/reverse electromotive force) of the generator connected to the engine pulley, although it may be different from vehicle to vehicle .
  • the final generation voltage is set considering the information on the state of decreasing or accelerating the vehicle speed as well as the charge rate of the battery, so that if the charge rate of the battery is high, the generation voltage is set low even if decreasing the speed, and on the contrary, the generation voltage is set high.
  • the system minimizes the electric generation load of the generator so as to considerably reduce the fuel consumption, thus increasing the fuel efficiency by about 1-3% according to the kind of vehicle.
  • the present invention is conceived to resolve the problem with the prior art described above, and an object of the present invention is to provide a system for managing the battery of a vehicle including a generator for both supplying electric power to an electric load and charging the battery; a battery sensor for detecting/calculating the charge rate, voltage, current, and liquid temperature of the battery so as to generate a signal; and an engine control unit which, when a vehicle is parked for a long time after stopping an engine and after woken up, forces an engine to start in order to drive the generator when satisfying the requirements for driving a generator set on the basis of the information of the gear transmission, the liquid temperature of the battery, and no- load charged voltage which are received from the battery sensor, so that the charged voltage of the battery detected by the battery sensor does not exceed a predetermined target value when a vehicle is parked for a long time after with the engine stopped, the generator is woken up to charge the battery at least to the predetermined value.
  • the present invention is conceived to resolve the problem with the prior art described above, and another object of the present invention is to provide a method for managing the battery of a vehicle to make an engine control unit wake up to deliberately start the engine so as to charge the battery at a predetermined time after stopping of the engine, comprising the steps of: determining whether a predetermined time is exceeded after stopping of the engine; determining whether the requirements set for driving a generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage received from a battery sensor supplied from the battery sensor; and deliberately starting the engine so as to drive the generator to charge the battery, so that when the charged voltage of the battery detected by the battery sensor does not exceed a predetermined target value when a vehicle is parked for a long time after the engine is stopped, the generator is woken up to charge the battery at least to the predetermined targeted value.
  • system for managing the battery of a vehicle comprises: a generator for both supplying electric power to an electric load and charging the battery; a battery sensor for detecting/calculating the charge rate, voltage, current, and liquid temperature of the battery so as to generate a signal; and an engine control unit woken up for driving the generator to charge based on the charged voltage detected by the battery sensor, characterized in that when a vehicle is parked for a long time with the engine stopped, the engine control unit deliberately starts the engine to drive the generator if the requirements set for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage received from the battery sensor.
  • the requirements for driving the generator are characterized by neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
  • the engine control unit is characterized by being programmed so as to stop the engine operation if the charged voltage of the battery exceeds the minimum value for driving the engine, or the preset time for driving the engine is exceeded.
  • a method for managing the battery of a vehicle to make an engine control unit wake up to deliberately start the engine so as to charge the battery at a predetermined time after stopping of the engine is characterized by comprising the steps of: determining whether a predetermined time is exceeded after stopping of the engine; determining whether the requirements set for driving a generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage supplied from a battery sensor; and deliberately starting the engine so as to drive the generator to charge the battery .
  • the requirements for driving the generator are characterized by neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value .
  • the step of charging the battery includes a further step of stopping the engine operation if the charged voltage of the battery exceeds the minimum value for driving the engine, or the preset time for driving the engine is exceeded .
  • the system and method for managing the battery of the present invention wake up the engine control unit when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too.
  • Fig. 1 is a graph for showing the amount of electricity generated by a generator and the amount of fuel injection against the vehicle speed and the amount of fuel injection according to prior art;
  • Fig. 2 illustrates a system for managing the battery of a vehicle according to an embodiment of the present invention
  • Fig. 3 illustrates a process for managing the battery of a vehicle according to another embodiment of the present invention .
  • the system of managing the battery of a vehicle includes a battery 11, a generator 13, a battery sensor 15, an engine control unit 17, and an engine 19 in order to deliberately start the engine periodically to charge the battery discharged when the vehicle is parked for a long time.
  • the system has a generator (alternator 13) connected through a wire to the battery 11.
  • an electric load is supplied with electric power through an electric wire between the alternator 13 and the battery 11.
  • the battery sensor 15 is arranged between a terminal of the battery and the electric load and the alternator 13 to calculate the charge rate of the battery by means of charge accumulation based on the amount of the charging and discharging current measured of the battery 13.
  • a voltmeter 16 is arranged between the positive and the negative terminal of the battery 11, or instead of it, the engine control unit 17 can measure the voltage from the electric wire connected to the battery 11.
  • the system is designed so that if a predetermined time has elapsed after parking the vehicle for a long time with the engine stopped, and the requirements set for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage received from the battery sensor, the engine may be deliberately started to drive the generator to charge the battery.
  • the requirements for driving said generator are neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
  • the predetermined and the predefined limit value are obtained through performing many experiments to be used to derive the minimum charging voltage of the battery for driving the engine.
  • the predetermined and predefined values corresponding to the minimum charging voltage of the battery are stored in the engine control unit as a look-up table.
  • the engine control unit 17 determines whether a predetermined time has elapsed after parking a vehicle with the engine stopped, and if so, is woken up to receive the information of the gear transmission externally supplied, and the liquid temperature and no-load charged voltage of the battery from the battery sensor 15.
  • the engine control unit 17 determines whether predefined requirements for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage, and if so, deliberately starts the engine 19 to drive the generator 13 to charge the battery 11.
  • the engine control unit 17 ends the program after stopping the engine 19 if the charged voltage of the battery 11 approaches a predetermined targeted value.
  • the predetermined value, predetermined time, limit value, and target value are obtained through performing many experiments, and stored as a look-up table in order to maintain the generator at the optimal state.
  • Fig. 3 is a flow chart for illustrating the process for operating the generator of the engine control unit 17 shown in Fig. 2. The process for operating the generator is described in connection with Fig. 3.
  • the engine control unit 17 is woken up if the predetermined time has elapsed after parking the vehicle with the engine stopped, and deliberately starts the engine if the requirements for driving the generator are satisfied.
  • the engine control unit 17 receives the information of the engine running time from the outside in step 101 to determine in step 103 whether the predetermined time has elapsed after stopping of the engine.
  • step 103 if the predetermined time has elapsed after stopping of the engine, the engine control unit 17 wakes up in step 105 to receive the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage from the battery sensor 15.
  • the engine control unit 17 determines whether the requirements for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage (step 107) .
  • the requirements for driving the generator are neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
  • step 107 if the requirements for driving the generator 13 are satisfied, the engine control unit 17 deliberately starts the engine to drive the generator 13 to charge the battery 11 (steps 109, 111, and 113) .
  • step 115 determines whether the charged voltage of the battery has reached the target value in step 115, and if so, proceeds to step 119 to stop the engine.
  • step 115 determines whether a predefined engine drive time is exceeded, and if so, proceeds to step 119.
  • the engine control unit is woken up when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too.
  • the engine control unit is woken up when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too.
  • the system and method for managing the battery of the vehicle are significantly improved, which can be readily applied to the vehicles commercially available .
  • a communication module can be provided, which is connected to the engine control unit (ECU) .
  • the communication module can be used for communicating an intention to start the engine or the event that the engine has been started by the ECU to a device, in particular a remote device such as a mobile device, in particular a smart phone.
  • the remote device can also be a remote server (e.g. an email server) or a local computer.
  • the communication module is adapted to send a message to the remote device, in particular a message according to a mobile communications protocol or according to an internet protocol, eg. an email.
  • the message contains the information that there is an intention to start the engine or that the engine has been started.
  • the message can contain data detected by the battery sensor.
  • the ECU can be adapted to start the motor after a start confirmation received via the communication module has been received by the remote device this way, the user can confirm the engine start from remote

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Control Of Charge By Means Of Generators (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Disclosed are a system and method for managing the battery of a vehicle. According to the present invention, an engine control unit is woken up when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too.

Description

SPECIFICATION
TITLE OF THE INVENTION
SYSTEM AND METHOD FOR MANAGING BATTERY OF VEHICLE
TECHNICAL FIELD
The present invention relates to a system and method for managing the battery of a vehicle, and more particularly to a system and method for recharging the battery discharged at a predetermined time after parking a vehicle with the engine stopped .
BACKGROUND OF THE INVENTION
Generally, the electric source of a vehicle is obtained by using a generator to charge the electric load and battery with the power (the product of voltage and current) . If the electric load is too great to supply with the power of the generator, the power of the battery is used to supply the electric load. In a system where the generator is not controlled to produce electricity, the generator usually keeps on generating a given voltage, thus unnecessarily consuming fuel. Hence, a few years ago, a system of variable voltage generation began to be used which intensively operates the generator when cutting off fuel for decreasing the speed of the vehicle, and minimizes the electricity produced by the generator when the vehicle is idled, driven at a constant speed, or with an acceleration.
Fig. 1 represents correlation of the vehicle speed (a), the voltage produced by the generator (b) , and the amount of the fuel injection (c) with reference to the time axis.
In order to construct the system, a battery sensor is added to detect/calculate the amount of current flowing in or out of the battery, the liquid temperature of the battery, the voltage of the battery, etc. to generate a signal, and to calculate/output the charge rate of the battery by means of charge accumulation based on the current amount received.
The vehicle provided with the system cuts off fuel and sets the voltage produced by the generator as high when decreasing the vehicle speed with the acceleration pedal released .
In addition, except for decreasing the vehicle speed, a control is made to stop or minimize the operation of the generator so as to minimize the load (electric generation load/reverse electromotive force) of the generator connected to the engine pulley, although it may be different from vehicle to vehicle .
The final generation voltage is set considering the information on the state of decreasing or accelerating the vehicle speed as well as the charge rate of the battery, so that if the charge rate of the battery is high, the generation voltage is set low even if decreasing the speed, and on the contrary, the generation voltage is set high.
The system minimizes the electric generation load of the generator so as to considerably reduce the fuel consumption, thus increasing the fuel efficiency by about 1-3% according to the kind of vehicle.
However, the electric generation control of the vehicle described above is carried out upon decreasing the vehicle speed, and therefore, when the vehicle is parked for a long time with the engine stopped, and the battery is fully discharged, the engine cannot be started. CONTENT OF THE INVENTION
Objects of the Invention
The present invention is conceived to resolve the problem with the prior art described above, and an object of the present invention is to provide a system for managing the battery of a vehicle including a generator for both supplying electric power to an electric load and charging the battery; a battery sensor for detecting/calculating the charge rate, voltage, current, and liquid temperature of the battery so as to generate a signal; and an engine control unit which, when a vehicle is parked for a long time after stopping an engine and after woken up, forces an engine to start in order to drive the generator when satisfying the requirements for driving a generator set on the basis of the information of the gear transmission, the liquid temperature of the battery, and no- load charged voltage which are received from the battery sensor, so that the charged voltage of the battery detected by the battery sensor does not exceed a predetermined target value when a vehicle is parked for a long time after with the engine stopped, the generator is woken up to charge the battery at least to the predetermined value.
The present invention is conceived to resolve the problem with the prior art described above, and another object of the present invention is to provide a method for managing the battery of a vehicle to make an engine control unit wake up to deliberately start the engine so as to charge the battery at a predetermined time after stopping of the engine, comprising the steps of: determining whether a predetermined time is exceeded after stopping of the engine; determining whether the requirements set for driving a generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage received from a battery sensor supplied from the battery sensor; and deliberately starting the engine so as to drive the generator to charge the battery, so that when the charged voltage of the battery detected by the battery sensor does not exceed a predetermined target value when a vehicle is parked for a long time after the engine is stopped, the generator is woken up to charge the battery at least to the predetermined targeted value.
Summary of the Invention
According to an embodiment of the present invention, system for managing the battery of a vehicle comprises: a generator for both supplying electric power to an electric load and charging the battery; a battery sensor for detecting/calculating the charge rate, voltage, current, and liquid temperature of the battery so as to generate a signal; and an engine control unit woken up for driving the generator to charge based on the charged voltage detected by the battery sensor, characterized in that when a vehicle is parked for a long time with the engine stopped, the engine control unit deliberately starts the engine to drive the generator if the requirements set for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage received from the battery sensor.
Preferably, the requirements for driving the generator are characterized by neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
Preferably, the engine control unit is characterized by being programmed so as to stop the engine operation if the charged voltage of the battery exceeds the minimum value for driving the engine, or the preset time for driving the engine is exceeded.
According to another embodiment of the present invention, a method for managing the battery of a vehicle to make an engine control unit wake up to deliberately start the engine so as to charge the battery at a predetermined time after stopping of the engine is characterized by comprising the steps of: determining whether a predetermined time is exceeded after stopping of the engine; determining whether the requirements set for driving a generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage supplied from a battery sensor; and deliberately starting the engine so as to drive the generator to charge the battery .
Preferably, the requirements for driving the generator are characterized by neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value .
Preferably, the step of charging the battery includes a further step of stopping the engine operation if the charged voltage of the battery exceeds the minimum value for driving the engine, or the preset time for driving the engine is exceeded . Effects of the Invention
The system and method for managing the battery of the present invention wake up the engine control unit when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings attached to this specification only illustrate preferred embodiments of the present invention in order to make the technical concept of the present invention more understandable along with the detailed description of the present invention, and so do not limit the present invention.
Fig. 1 is a graph for showing the amount of electricity generated by a generator and the amount of fuel injection against the vehicle speed and the amount of fuel injection according to prior art;
Fig. 2 illustrates a system for managing the battery of a vehicle according to an embodiment of the present invention; and
Fig. 3 illustrates a process for managing the battery of a vehicle according to another embodiment of the present invention .
DETAILED DESCRIPTION FOR CARRYING OUT THE PRESENT INVENTION
Hereinafter, a system for managing the battery of a vehicle is more specifically described with reference to the attached drawings.
Referring to Fig. 2 illustrating a system for managing the battery of a vehicle according to the present invention, the system of managing the battery of a vehicle includes a battery 11, a generator 13, a battery sensor 15, an engine control unit 17, and an engine 19 in order to deliberately start the engine periodically to charge the battery discharged when the vehicle is parked for a long time.
Namely, the system has a generator (alternator 13) connected through a wire to the battery 11. In addition, an electric load is supplied with electric power through an electric wire between the alternator 13 and the battery 11. The battery sensor 15 is arranged between a terminal of the battery and the electric load and the alternator 13 to calculate the charge rate of the battery by means of charge accumulation based on the amount of the charging and discharging current measured of the battery 13. A voltmeter 16 is arranged between the positive and the negative terminal of the battery 11, or instead of it, the engine control unit 17 can measure the voltage from the electric wire connected to the battery 11.
Here, the process for calculating the charge rate of the battery by means of charge accumulation based on the amount of the charging and discharging current measured by the battery sensor is well known in the art, and therefore, the detailed description thereof is omitted.
In addition, the system is designed so that if a predetermined time has elapsed after parking the vehicle for a long time with the engine stopped, and the requirements set for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage received from the battery sensor, the engine may be deliberately started to drive the generator to charge the battery.
In this case, the requirements for driving said generator are neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
Here, the predetermined and the predefined limit value are obtained through performing many experiments to be used to derive the minimum charging voltage of the battery for driving the engine. The predetermined and predefined values corresponding to the minimum charging voltage of the battery are stored in the engine control unit as a look-up table.
The engine control unit 17 determines whether a predetermined time has elapsed after parking a vehicle with the engine stopped, and if so, is woken up to receive the information of the gear transmission externally supplied, and the liquid temperature and no-load charged voltage of the battery from the battery sensor 15.
Moreover, the engine control unit 17 determines whether predefined requirements for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage, and if so, deliberately starts the engine 19 to drive the generator 13 to charge the battery 11.
In addition, the engine control unit 17 ends the program after stopping the engine 19 if the charged voltage of the battery 11 approaches a predetermined targeted value.
In the embodiments of the present invention, the predetermined value, predetermined time, limit value, and target value are obtained through performing many experiments, and stored as a look-up table in order to maintain the generator at the optimal state.
The operation of the system is described with reference to Fig. 3. Fig. 3 is a flow chart for illustrating the process for operating the generator of the engine control unit 17 shown in Fig. 2. The process for operating the generator is described in connection with Fig. 3.
Firstly, the engine control unit 17 is woken up if the predetermined time has elapsed after parking the vehicle with the engine stopped, and deliberately starts the engine if the requirements for driving the generator are satisfied.
Namely, the engine control unit 17 receives the information of the engine running time from the outside in step 101 to determine in step 103 whether the predetermined time has elapsed after stopping of the engine.
In step 103, if the predetermined time has elapsed after stopping of the engine, the engine control unit 17 wakes up in step 105 to receive the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage from the battery sensor 15.
The engine control unit 17 determines whether the requirements for driving the generator are satisfied based on the information of the gear transmission, the liquid temperature of the battery, and no-load charged voltage (step 107) .
Here, the requirements for driving the generator are neutrality of the gear transmission, the liquid temperature of the battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
In step 107, if the requirements for driving the generator 13 are satisfied, the engine control unit 17 deliberately starts the engine to drive the generator 13 to charge the battery 11 (steps 109, 111, and 113) .
Then, the engine control unit 17 determines whether the charged voltage of the battery has reached the target value in step 115, and if so, proceeds to step 119 to stop the engine.
In addition, if the charged voltage of the battery has not reached the target value in step 115, the engine control unit 17 determines whether a predefined engine drive time is exceeded, and if so, proceeds to step 119.
According to the embodiments of the present invention, the engine control unit is woken up when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too.
It is understandable that a person skilled in the art can make other embodiments of the present invention without departing from the technical concept or gist of the present invention. Therefore, the embodiments described above are only by way of example, not limiting the present invention. The scope of the present invention is defined not by the detailed description described above, but by the attached claims. All changes and modifications of the present invention derived from the meaning and scope of the claims and their equivalent should be included in the scope of the present invention.
Industrial Applicability
The engine control unit is woken up when a vehicle is parked for a long time with the engine stopped, to deliberately start the engine to drive the generator to charge the battery if the requirements set for driving the generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load voltage received from the battery sensor, so that the starting of the engine is improved by charging the battery that has been discharged when a vehicle has been parked for a long time, and the battery performance too. Thus the system and method for managing the battery of the vehicle are significantly improved, which can be readily applied to the vehicles commercially available .
Additional Aspects
A communication module can be provided, which is connected to the engine control unit (ECU) . The communication module can be used for communicating an intention to start the engine or the event that the engine has been started by the ECU to a device, in particular a remote device such as a mobile device, in particular a smart phone. The remote device can also be a remote server (e.g. an email server) or a local computer. The communication module is adapted to send a message to the remote device, in particular a message according to a mobile communications protocol or according to an internet protocol, eg. an email. The message contains the information that there is an intention to start the engine or that the engine has been started. In addition, the message can contain data detected by the battery sensor. Further, the ECU can be adapted to start the motor after a start confirmation received via the communication module has been received by the remote device this way, the user can confirm the engine start from remote
DESCRIPTION OF REFERNCE NUMERALS
11 BATTERY
13 ELECTRIC GENERATOR
15 BATTERY SENSOR
17 ENGINE CONTROL UNIT
19 ENGINE

Claims

CLAIMS :
1. A system for managing the battery of a vehicle comprising: a generator for both supplying electric power to an electric load and charging the battery; a battery sensor for detecting/calculating the charge rate, voltage, current, and liquid temperature of said battery so as to generate a signal; and an engine control unit which wakes up and drives said generator to charge the battery based on the charged voltage detected by said battery sensor, characterized in that when a vehicle is parked for a long time with the engine stopped, said engine control unit deliberately starts the engine to drive said generator if the requirements set for driving said generator are satisfied based on the information of the gear transmission, the liquid temperature of said battery, and no-load charged voltage received from said battery sensor .
2. The system for managing the battery of a vehicle as claimed in claim 1, characterized in that when a vehicle is parked for a long time after the engine is stopped, the requirements for driving said generator are neutrality of the gear transmission, the liquid temperature of said battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
3. The system for managing the battery of a vehicle as claimed in claim 2, characterized in that said engine control unit is programmed so as to stop the engine operation if the charged voltage of said battery exceeds the minimum value for driving the engine, or the preset time for driving the engine is exceeded.
4. A method for managing the battery of a vehicle to make an engine control unit wake up to deliberately start the engine so as to charge the battery at a predetermined time after stopping of the engine, comprising the steps of: determining whether a predetermined time is exceeded after stopping of the engine; determining whether the requirements set for driving a generator are satisfied based on the information of the gear transmission externally supplied, and the liquid temperature of the battery and no-load charged voltage supplied from a battery sensor; and deliberately starting the engine so as to drive said generator to charge the battery.
The method for managing the battery of a vehicle as claimed in claim 4, characterized in that the requirements for driving said generator are neutrality of the gear transmission, the liquid temperature of said battery not exceeding a predetermined value, and no-load voltage not exceeding a predefined limit value.
The method for managing the battery of a vehicle as claimed in claim 5, characterized in that the step of charging the battery includes a further step of stopping the engine operation if the charged voltage of said battery exceeds the minimum value for driving the engine, or the preset time for driving the engine is exceeded.
PCT/EP2014/056895 2013-04-08 2014-04-07 System and method for managing battery of vehicle WO2014166852A2 (en)

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CN115230508A (en) * 2021-04-23 2022-10-25 北京昇科能源科技有限责任公司 Charging method and device of charging pile with cooling function

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US20200363478A1 (en) * 2018-01-16 2020-11-19 Renault S.A.S. Method for detecting a faulty cell in an electric battery
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CN115230508A (en) * 2021-04-23 2022-10-25 北京昇科能源科技有限责任公司 Charging method and device of charging pile with cooling function

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