DE102015104929A1 - Vehicle power supply system - Google Patents

Abstract

A vehicle power supply system for a vehicle includes a machine with a starter. The vehicle power supply system includes a main battery and an accessory battery, which is electrically connected to the starter. The vehicle power supply system also includes at least one electrical load that is electrically connected to the main battery and a circuit that electrically connects between a first combination of components and a second combination of components. The first component combination includes the main battery and the at least one first electrical load, and the second component combination includes the starter and the accessory battery. The circuit electrically disconnects the first combination of components from the second component combination while the starter starts the engine.

Description

TECHNICAL AREA

The present disclosure relates to a vehicle power supply system installed in a vehicle equipped with a starter engine.

BACKGROUND

Vehicle power supply systems are equipped with a main battery that supplies electric power to a drive motor and an accessory battery that supplies electric power to electrical loads. There is a vehicle power supply system described in Patent Document 1 which is the one disclosed Japanese Patent No. 2013-13196 is. The vehicle power supply system disclosed in Patent Document 1 is configured such that the accessory battery turns on a relay contact for the main battery to start a corresponding vehicle.

The vehicle power supply system is also configured to compensate for a reduction in output voltage of the accessory battery over time. That is, the vehicle power supply system is equipped with an auxiliary battery in addition to the main battery and the accessory battery. The vehicle power supply system supplies electric power from the auxiliary battery to the relay contact instead of the accessory battery if the output voltage of the accessory battery decreases over time.

However, in the vehicle power supply system described in Patent Document 1, e.g. B., the output voltage of the accessory battery temporarily or temporarily, while the system supplies electrical power from the accessory battery to a starter of a machine and / or other loads. Therefore, in the vehicle power supply system described in Patent Document 1, a decrease in an applied voltage to the electric loads may not be considered. If the electrical loads include safety devices of the vehicle, the temporary drop in voltage can cause operational errors in the electrical loads. If the electrical loads include a vehicle navigation system and / or otherwise, the temporary drop in voltage may cause malfunction of the system and / or other.

Therefore, the temporary drop in voltage can cause some kind of discomfort to a driver and vehicle passengers or problems.

SUMMARY OF THE INVENTION

The vehicle power supply system described in Patent Document 1 is equipped with an auxiliary battery in addition to the main battery and the accessory battery. Therefore, problems can occur in the vehicle power supply system described in Patent Document 1. For example, the problems include taking up space for installing the auxiliary battery, increasing the vehicle weight and the manufacturing cost of the vehicle, substituting an auxiliary battery for a user, and others.

The present disclosure is arranged to solve the above-mentioned problems. The present disclosure is to provide a vehicle power supply system capable of reducing the drop of voltage applied to an electric load while a stator starts a machine without installing an auxiliary battery in the system.

The present disclosure is directed to a vehicle power supply system for a vehicle including a machine with a starter. The vehicle power supply system includes a main battery and an accessory battery, which is electrically connected to the starter. The vehicle power supply system includes at least one electrical load that is electrically connected to the main battery and a circuit that electrically connects between a first combination of components and a second combination of components.

The first combination of components includes the main battery and the at least one electrical load, and the second component combination includes the starter and the accessory battery. The circuit electrically disconnects the first combination of components and the second component combination while the starter is starting the engine. Since the starter used for starting the engine requires a significant amount of electric power during starting of the engine, a voltage of the accessory battery that supplies the electric power to the starter will temporarily decrease during engine startup. Consequently, if the accessory battery were connected to the at least one electrical load during electrical power, a malfunction and / or otherwise would occur in the at least one electrical load due to a temporary drop in voltage from the accessory battery to the starter.

In view of the circumstances described above, the circuit of the vehicle power supply system according to the present disclosure electrically disconnects the first component combination including the main battery and the at least one electric load from the second component combination including the starter and the accessory battery while the starter is the engine starts.

This configuration of the vehicle power supply system results in the main battery supplying electric power to the at least one electric load regardless of the change of the voltage output from the accessory battery. Therefore, the vehicle power supply system according to the present disclosure supplies electric power in a stable manner to the at least one electric load without installing an additional battery therein other than the main battery or the accessory battery.

BRIEF DESCRIPTION OF THE DRAWING

Other aspects of the present disclosure will become apparent from the following description of the embodiments with reference to the accompanying drawings. It shows / show:

1 an electrical block diagram schematically illustrating a vehicle power supply system according to a first embodiment of the present disclosure;

2 FIG. 10 is a flowchart schematically illustrating a method according to the first embodiment that performs an ECU while a starter restarts an engine that has been stopped; FIG.

3 a timing chart schematically illustrating the change in the control signals for the starter and a disconnector, and the change in the number of revolutions of a crankshaft in the engine, while the starter starts the engine according to the first embodiment; and

4 12 is an electrical block diagram schematically illustrating a vehicle power supply system according to a second embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Specific embodiments of the present disclosure will be described below with reference to the accompanying drawings. In the embodiments, like reference numerals designate identical or similar parts of the embodiments to omit or simplify redundant description of these parts.

First embodiment

1 FIG. 10 is an electrical block diagram of a vehicle power supply system according to the first embodiment. FIG. The vehicle power supply system according to this embodiment is installed, for example, in a hybrid vehicle equipped with a machine 11 and a motor generator 12 Is provided. Driving force, which from or through the machine 11 and / or the motor generator 12 is generated, becomes a transmission mechanism 13 transfer. The transmission mechanism 13 , which is connected to a drive shaft of the vehicle, receives the driving force, which from the machine 11 and / or the motor generator 12 is transmitted. The transmission mechanism 13 converts the driving force to a required driving force, thus driven in accordance with the converted driving force wheels, which are connected to the drive shaft of the vehicle.

The vehicle power supply system is with a main battery 21 , an inverter 22 , a DC / DC converter 23 , first electrical loads 24 , an accessory battery 31 , a starter 32 and a circuit breaker 41 fitted. The inverter 22 includes DC (DC), positive and negative input / output (I / O) terminals, and AC (input) / output (I / O) terminals. The DC / DC converter 23 includes first and second positive and negative I / O connections. In addition, the vehicle is with an ECU 100 fitted. Control signals, which from the ECU 100 receive the inverter 22 , the DC / DC converter, the starter 32 and the circuit breaker 41 at.

Each of the main and accessory batteries 21 and 31 has a positive terminal and a negative terminal. The positive connection of the main battery 21 is with the DC positive I / O terminal of the inverter 22 and the first positive I / O terminal of the DC / DC converter 23 connected. The negative connection of the main battery 21 is with the DC negative I / O terminal of the inverter 22 and the first negative I / O terminal of the DC / DC converter 23 connected. The AC I / O ports of the inverter 22 are with the motor generator 12 connected.

The second positive I / O port of the DC / DC converter 23 is with the positive terminals of the first electrical loads 24 over a first connection point 25 connected, and the second negative I / O port of the DC / DC converter 23 is with the negative terminals of the first electrical loads 24 connected. The second negative I / O port of the DC / DC converter 23 is also with the negative connection of the accessory battery 31 connected. The positive connection of the accessory battery 31 is with a positive connection of the starter 32 via a second connection point 33 connected, and a negative connection of the starter 32 is with a negative connection of the accessory battery 31 connected. The first connection point 25 and the second connection point 33 are connected to each other via the disconnector 41 connected.

The main battery 21 For example, a lithium-ion battery that includes a plurality of battery cells connected in series with each other and the range of an output voltage of the main battery 21 is set, for example, in the range of from 240V to 400V.

The inverter 22 Converts DC power input to the DC positive and negative I / O terminals into AC power, and outputs the AC power from the AC I / O terminals. The inverter 22 converts AC power supplied to the AC I / O terminals into DC power, and outputs DC power from the DC positive and negative DC A / O terminals.

The motor generator 12 works as a drive motor, which by the AC power output from the inverter 22 is operated to generate a drive power. The motor generator 12 Also functions as a generator to perform regenerative power generation while the vehicle reduces its vehicle speed to produce AC power, and this gives the AC power to the inverter 22 from.

The DC / DC converter 23 A voltage input to the first positive and negative I / O terminals converts to a voltage different in level from the input voltage, and outputs this converted voltage from the second positive and negative I / O terminals from. The DC / DC converter 23 Also, a voltage input to the second positive and negative I / O terminals converts to a voltage different in level from the input voltage, and outputs this converted voltage from the first positive and negative I / O terminals from.

The first electrical loads 24 include in-vehicle or vehicle-based devices, such. B. vehicle navigation systems and more. In addition, the first include electrical loads 24 safety-related devices, such as B. electrical control devices of the vehicle and more.

The accessory battery is, for example, a lead-acid battery whose output voltage is set to 12 V, for example. The DC power output from the accessory battery 31 will be the starter 32 over the second connection point 33 fed. The starter 32 increases the number of revolutions of the crankshaft in the machine 11 high to a predetermined number of revolutions, which is suitable, the machine 11 to start. This is how the starter starts 32 the machine 11 ,

The circuit breaker 41 For example, a switch which is driven by receiving a control signal from the ECU 100 is sent. The circuit breaker 41 is closed while the control signal is not received. The circuit breaker 41 is open while control signal from the ECU 100 is received, thereby a current flow between the first connection point 25 and the second connection point 33 to disconnect or interrupt. That is, the circuit breaker 41 is designed as a normally closed switch, which is closed until the control signal to this from the ECU 100 is entered.

2 FIG. 3 is a flowchart illustrating the method that the ECU 100 performs while the starter the machine 11 Restarts, which was previously switched off, this being done automatically by the start-stop system. In addition, the ECU performs 100 the procedure that is in 2 is shown in a predetermined control period or control period by.

First, the ECU determines 100 whether a request to restart the machine 11 is given by the driver of the vehicle in step S101. If the ECU 100 determines that the request to restart by the user is not given (S101: No), then the process is terminated. If the ECU 100 determines that the request for restarting has been issued by the driver (S101: Yes) transmits the ECU 100 the control signals to the starter 32 and to the circuit breaker 41 (S102).

When the control signal from the ECU 100 is received, then the circuit breaker 41 switched from the closed state to the open state, thereby terminating a current flow, which is between the first connection point 25 and the second connection point 33 flows.

When the control signal is received, the stator increases 32 the number of revolutions of the crankshaft in the machine 11 high to the predetermined number of revolutions around the machine 11 to restart.

The ECU 100 monitors whether starting the machine 11 is finished (S103). If the ECU 100 determines that starting the machine 11 is not completed (S103: No), then the ECU is running 100 thus, the control signals to the starter 32 and the circuit breaker 41 transferred to. If the number of revolutions of the crankshaft that the machine 11 indicates that it is equal to or greater than a predetermined number of revolutions, then the ECU determines 100 that starting the machine 11 is finished (S103: Yes). Consequently, the ECU ends 100 the transmission of the control signals to the stator 32 and to the circuit breaker 41 (S104).

3 is a timing diagram which schematically shows the change in the control signals for the starter 32 and for the circuit breaker 41 This also shows the change in the number of revolutions of the crankshaft in the engine 11 while the starter is the machine 11 starts.

In 3 the vehicle is in an idling idle mode, allowing the number of revolutions of the engine 11 until time T1 is zero. At time T1, if a restart request by the user to the ECU 100 is given, transfers the ECU 100 the control signals to the starter 32 and to the circuit breaker 41 , The starter 32 increases the number of revolutions in the machine 11 by receiving the control signal from the ECU 100 , If the number of revolutions of the machine 11 at time T2 is equal to or greater than the predetermined number, the ECU determines 100 that the machine 11 has been started. In this way, at the time T2, the ECU ends 100 transmitting the control signals to the starter 32 and to the circuit breaker 41 ,

The vehicle power supply system according to the first embodiment operates the motor generator 12 such that this as a generator is the main battery 21 and the accessory battery 31 invites.

More specifically, the AC power output is from the motor generator 12 , which serves as a generator, into the DC power through the inverter 22 converted and the DC power flows into the main battery 21 and the DC / DC converter 23 so the main battery 21 is loaded.

The DC / DC converter 23 reduces the voltage of the input DC power to a predetermined voltage, which is higher than the voltage of the accessory battery 31 ,

Therefore, a voltage is at the first connection point 25 higher than a voltage at the second connection point 33 , In this way, a current flows from the first connection point 25 to the second connection point 33 and the accessory battery 31 so the accessory battery 31 is loaded.

In addition, the DC / DC converter 23 capable of the accessory battery 31 with the electrical power of the main battery 21 by reducing a voltage of the power output from the main battery 21 to a higher level than the voltage of the accessory battery 31 , to load. In addition, the DC / DC converter 23 capable of the main battery 21 with the electrical power of the accessory battery 31 by increasing a voltage of the electrical power supplied by the accessory battery 31 is discharged to a level which is greater than the voltage of the main battery 21 is to load.

The configuration of the vehicle power supply system according to the first embodiment achieves the following effects.

Because the stator 32 , which is used for starting the machine, requires a lot of electrical power to power the machine 11 To start, the voltage of the accessory battery decreases 31 which the starter 32 supplied, at times, during the starter 32 the machine 11 starts. In this way, a temporary drop in the voltage of the accessory battery would cause operating errors and / or further on or at the electrical loads 24 cause, if the electric power from the accessory battery 31 to the first electrical loads 24 would be supplied.

However, in the first embodiment, the vehicle power supply system opens the circuit breaker 41 , which is normally closed to the current between the first connection point 25 and the second connection point 33 to interrupt while the starter 32 the machine 11 starts.

The structure of the vehicle power supply system receives the supply of electric power from the main battery 21 to the first electrical loads 24 regardless of the output voltage of the accessory battery 31 , In this way, the vehicle power supply system supplies the first electrical loads 24 with a stable voltage from the main battery 21 , where the voltage drop of the accessory battery 31 has only a small influence.

Therefore, the vehicle power supply system stabilizes the voltage corresponding to the first electrical loads 24 is entered, and this without using extra batteries, which are other than the main battery 21 and the accessory battery 31 ,

If a power source of the vehicle is off, the electric power will not be from the main battery 21 to the first electrical loads 24 supplied as the DC / DC converter 23 is not activated.

In the first embodiment, if the power source of the vehicle is off, then the circuit breaker 41 closed, since the ECU 100 is disabled, leaving the disconnect switch 41 the control signal from the ECU 100 not received or not received. In the first embodiment, the circuit breaker 41 normally closed, and this is switched so that it is open when the corresponding control signal to this from the ECU 100 is sent. Therefore, in the first embodiment, if the power source of the vehicle is off, the disconnect switch is 41 so closed, that the first electrical loads 24 and the accessory battery 31 are connected to each other electrical. In this way, even if the electric power of the vehicle is off, the accessory battery is 31 capable of electrical power to the first electrical loads 24 supply.

Second embodiment

4 FIG. 10 is an electrical block diagram of the vehicle power supply system of the second embodiment. FIG. The vehicle power supply system according to the second embodiment is also installed in a hybrid vehicle equipped with a machine 11 and a motor generator 12 in a similar manner as the vehicle power supply system according to the first embodiment.

The vehicle power supply system according to the second embodiment is different from the first embodiment in that the vehicle power supply system of the second embodiment is further provided with second electric loads 34 Is provided.

The second electrical loads 34 include components that do not affect the safety of the vehicle, and that do not cause a perception of discomfort for the users of the vehicle, even if one of the second electrical loads 34 applied voltage is temporarily reduced.

For example, the second include electrical loads 34 an electric fan, a wire heater, and more. The second electrical loads 34 are with a second connection point 33 connected, and even if a disconnector 41 Electric power is supplied from an accessory battery 31 to the second electrical loads 34 over the second connection point 33 fed.

This configuration of the vehicle power supply system according to the second embodiment achieves the following effects. The power capacity of a DC / DC converter 23 is determined based on the maximum load that the first electrical loads 24 need. Therefore, it is necessary to increase the capacity of the DC / DC converter 23 increase, as well as the number of first electrical loads 24 increases. In fact, certain types of electrical loads such. As the electric fan, the wire heater, and other, only a very small impact on the safety of the vehicle, and also this causes only a slight sense of lack of comfort for the users of the vehicle, even if there is a voltage to these types of electrical loads is temporarily reduced. Therefore, these types of electrical loads tolerate a temporary voltage drop applied to them.

This feature of these types of electrical loads allows these types of electrical loads from the first electrical loads 24 to the second electrical loads 34 be transferred. More specifically, the second electrical loads 34 which tolerate a temporary drop in the voltage applied thereto, configured to be electrically connected to the accessory battery 31 connect, even if the circuit breaker 41 has been switched from the closed state to the open state. In other words, the second electrical loads 34 electrically from the DC / DC converter 23 and a main battery 21 disconnected, even if the circuit breaker 41 is switched from the closed state to the open state.

• 1. Die Kapazität des DC/DC-Wandlers 23 kann basierend auf der maximalen Leistung bestimmt werden, welche für die ersten elektrischen Lasten 24 benötigt wird, welche mit dem DC/DC-Wandler 23 verbunden sind, während der Trennschalter 41 geöffnet ist.
• 2. Die Anzahl der ersten elektrischen Lasten 24 gemäß der zweiten Ausführungsform ist kleiner als die Anzahl der elektrischen Lasten 24 gemäß der ersten Ausführungsform.

This configuration of the vehicle power supply system according to the second embodiment makes it possible to increase the power capacity of the DC / DC converter 23 in comparison with the vehicle power supply system according to the first embodiment. This has the following causes:

• 1. The capacity of the DC / DC converter 23 can be determined based on the maximum power available for the first electrical loads 24 is needed, which with the DC / DC converter 23 are connected while the circuit breaker 41 is open.
• 2. The number of first electrical loads 24 according to the second embodiment is less than the number of electrical loads 24 according to the first embodiment.

The ECU 100 According to each of the first and second embodiments, it determines whether a request to restart the engine 11 is given by a driver of the vehicle, however, the present disclosure is not limited thereto. More precisely, the ECU 100 determine if a request to start the machine for the first time 11 is given by the driver of the vehicle.

modifications

In each of the above embodiments, the main battery is 21 a lithium-ion battery, and the accessory battery 31 is the lead battery. However, in each of the above embodiments, other battery types for the main battery 21 and for the accessory battery 31 be used.

In each of the above embodiments, the voltage of the main battery 21 higher than the voltage of the accessory battery 31 , However, in each of the above embodiments, the voltage of the main battery 21 lower than the voltage of the accessory battery 31 be. In this modification, the DC / DC converter 23 the voltage of the main battery 21 increase, and the increased voltage to the accessory battery 31 Feed when electrical power from the main battery 21 to the accessory battery 31 is supplied. The DC / DC converter 23 can also the voltage of the accessory battery 31 on the main battery 21 decrease when electrical power from the accessory battery 31 to the main battery 21 is supplied.

In each of the above embodiments, electric power charged by the motor generator charges 12 is generated, the main battery 21 and the accessory battery 31 , However, the starter can 32 serve as a generator to generate electrical power and around the main battery 21 and the accessory battery 31 load based on this generated electrical power.

The first electrical loads 24 and the second electrical loads 34 according to the second embodiment, which has been described above, are not limited to the specific electrical loads exemplified in the embodiments.

In the first and second embodiments of the present disclosure, the ECU corresponds 10 for example, a controller.

In the first and second embodiments of the present embodiment, the circuit breaker are used 41 and the ECU 100 for example as a circuit. The circuit is configured to electrically connect a first combination of components of the main battery 21 and the first electrical loads 24 and a second component combination of the starter 32 and the accessory battery 31 to disconnect while the stator 32 the machine starts.

The present disclosure is not limited to the specific embodiments described above and their modifications. More particularly, the present disclosure includes any and all possible embodiments that include omissions, combinations, modifications, adaptations, or even alternatives, as those skilled in the art will recognize. The limitations in the claims are to be interpreted broadly as expressed by the language of the claims. The scope of the present application is determined solely by the appended claims.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2013-13196 [0002]

Claims (5)

Vehicle power supply system for a vehicle comprising a machine ( 11 ) with a starter ( 32 ), the vehicle power supply system comprising: a main battery ( 21 ); an accessory battery ( 31 ), which are electrically connected to the starter ( 32 ) connected is; at least one electrical load ( 24 ), which are electrically connected to the main battery ( 21 ) connected is; and a circuit electrically connected between a first combination of components and a second combination of components, the first combination of components including the main battery. 21 ) and the at least one electrical load ( 24 ), and wherein the second combination of components includes the starter ( 32 ) and the accessory battery ( 31 ), wherein the circuit separates the first combination of components and the second combination of components while the starter ( 32 ) the machine ( 11 ) starts. Vehicle power supply system according to claim 1, further comprising: a DC / DC converter ( 23 ), which between the main battery ( 21 ) and the at least one electrical load ( 24 ), and which is included in the first combination of components. Vehicle power supply system according to claim 1 or 2, wherein the circuit comprises: a normally closed switch ( 41 ) electrically connected between the first combination of components and the second combination of components; and a controller ( 100 ), which is controlled by the normally closed switch ( 41 ) and which is configured to connect the normally closed switch ( 41 ) opens while the starter ( 32 ) the machine ( 11 ) starts. Vehicle power supply system according to one of claims 1 to 3, further comprising: at least a second electrical load ( 34 ) electrically connected to the auxiliary battery ( 31 ) and the circuit, wherein the at least one second electrical load ( 34 ) is electrically isolated from the first component combination while the normally closed switch is open. A vehicle power supply system according to any one of claims 1 to 4, wherein: the circuit is configured to electrically disconnect the first combination of components and the second combination of components while the starter restarts the machine, which has previously been automatically powered off.

Images