CN115573843B - Starter isolation circuit, device and automobile - Google Patents
Starter isolation circuit, device and automobile Download PDFInfo
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- CN115573843B CN115573843B CN202211406200.8A CN202211406200A CN115573843B CN 115573843 B CN115573843 B CN 115573843B CN 202211406200 A CN202211406200 A CN 202211406200A CN 115573843 B CN115573843 B CN 115573843B
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- 239000007858 starting material Substances 0.000 title claims abstract description 139
- 238000002955 isolation Methods 0.000 title claims abstract description 48
- 238000003860 storage Methods 0.000 claims abstract description 76
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Control Of Charge By Means Of Generators (AREA)
Abstract
The application provides a starting isolation circuit and device of a starter and an automobile. The circuit comprises a storage battery, a direct current converter, a switch structure, a whole vehicle controller, an analog switch, a starter and a starter relay, wherein the switch structure comprises a control end, the storage battery is connected with the switch structure, the switch structure is connected with the direct current converter, the whole vehicle controller is respectively connected with the storage battery and the analog switch, the analog switch is connected with the control end, the whole vehicle controller is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter is determined to start an engine, and the control end is used for controlling the switch structure to be only in one-way conduction when the analog switch is opened, so that the direct current converter stops charging the storage battery when the starter starts the engine. When the starter starts the engine, the circuit isolates the storage battery from the direct current converter, avoids the condition of pulling down the voltage of the direct current converter, improves the driving safety and also protects the direct current converter from being ablated.
Description
Technical Field
The present application relates to the field of automotive technologies, and in particular, to a starting isolation circuit and device for a starter, and an automobile.
Background
The hybrid power system can achieve better fuel-saving effect and has lower cost, so the hybrid power system is widely applied to automobiles. In a hybrid power system, two engine starting modes, namely motor starting and starter starting, are generally arranged, and are respectively suitable for different automobile working conditions.
In the prior art, after receiving a starting request of an engine, a vehicle controller judges whether an automobile meets the condition of starting the engine by a motor, if the condition is met, the vehicle controller controls the motor to start the engine, and if the condition of starting the engine by the motor is not met, the vehicle controller controls a starter to start the engine. However, in the existing low-voltage circuit, when the starter starts the engine, the battery is required to supply power to the starter, and the dc converter also participates in the starting process. In the transient state of the starter dragging engine, the voltage of the storage battery is pulled down, and meanwhile, the voltage of a direct current converter connected with the storage battery is also pulled down. At this time, not only the driving safety is not high, but also when the voltage of the direct current converter is lower than a certain value, the direct current converter can be triggered to report an overcurrent fault, and even the risk of ablating the safety of the direct current converter exists.
Therefore, there is a need to control the process of starting the engine by the starter to improve driving safety.
Disclosure of Invention
The application provides a starting isolation circuit and device of a starter and an automobile, which are used for solving the problems that in the prior art, when the starter drags an engine, the voltage of a direct-current converter is pulled down, so that the driving safety is low, and the direct-current converter is caused to report over-current faults and the like.
On one hand, the application provides a starting isolation circuit of a starter, which comprises a storage battery, a direct current converter, a switch structure, a whole vehicle controller, an analog switch, the starter and a starter relay, wherein the switch structure comprises a control end;
the whole vehicle controller is respectively connected with the storage battery and the analog switch, and the analog switch is connected with the control end;
The whole vehicle controller is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter starts the engine;
The control end is used for controlling the switch structure to be only in one-way conduction when the analog switch is disconnected, so that the direct current converter stops charging the storage battery when the starter starts the engine.
Optionally, the switching structure includes a diode and a switching element, the switching element including a first connection terminal, a second connection terminal, and a control terminal;
The first connecting end is connected with the anode of the diode and the storage battery, and the second connecting end is connected with the cathode of the diode and the direct current converter;
the diode is used for realizing unidirectional conduction from the storage battery to the direct-current converter;
the control terminal is configured to turn off the switching element when the analog switch is turned off, so that the direct current converter stops charging the battery when the engine is started by the starter.
Optionally, the switching element includes a MOS transistor, a source of the MOS transistor is the first connection end, a drain of the MOS transistor is the second connection end, and a gate of the MOS transistor is the control end;
And the grid electrode of the MOS tube is used for cutting off the MOS tube when the analog switch is disconnected, so that the direct current converter stops charging the storage battery when the starter starts the engine.
Optionally, the whole vehicle controller is further configured to close or open the analog switch according to the electric quantity of the storage battery after finishing the starting control of the starter, so that the direct current converter charges or does not charge the storage battery;
When the analog switch is closed, the whole vehicle controller also provides control voltage for the control end, wherein the control voltage can control the switch structure to be closed, so that the direct current converter charges the storage battery.
Optionally, the whole vehicle controller comprises a micro control unit and an amplifying circuit;
The micro control unit is respectively connected with the analog switch and the input end of the amplifying circuit, the input end of the amplifying circuit is also connected with the storage battery, and the output end of the amplifying circuit is connected with the analog switch;
the micro control unit is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter is determined to start the engine;
the micro control unit is also used for closing or opening the analog switch according to the electric quantity of the storage battery after the starting control of the starter is completed, so that the direct current converter charges or does not charge the storage battery;
The amplifying circuit is used for providing a control voltage for the control end when the analog switch is closed, and the control voltage can control the switch structure to be closed so as to enable the direct current converter to charge the storage battery.
Optionally, the amplifying circuit includes a triode, a base of the triode is an input end of the amplifying circuit, a collector of the triode is an output end of the amplifying circuit, and an emitter of the triode is grounded;
And the triode is used for providing a control voltage capable of controlling the switch structure to be closed for the control end when the analog switch is closed, so that the direct current converter charges the storage battery.
Optionally, the amplifying circuit further includes a capacitor, one end of the capacitor is connected to the collector of the triode, the other end of the capacitor is grounded, and the capacitor is used for filtering the control voltage.
Optionally, the starting isolation circuit further includes a battery monitoring sensor, the battery monitoring sensor is connected with the battery, and the battery monitoring sensor is used for monitoring the electric quantity of the battery and providing the electric quantity information of the battery for the whole vehicle controller.
In another aspect, the present application provides a starter starting isolation device comprising a starting isolation circuit as defined in any one of the preceding claims.
In another aspect, the application also provides an automobile comprising the starting isolation circuit as described in any one of the above.
The starting isolation circuit comprises a storage battery, a direct current converter, a switch structure, a whole vehicle controller, an analog switch, a starter and a starter relay, wherein the switch structure comprises a control end, the storage battery is connected with the switch structure, the switch structure is connected with the direct current converter, the whole vehicle controller is respectively connected with the storage battery and the analog switch, the analog switch is connected with the control end, the whole vehicle controller is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter starts an engine, and the control end is used for controlling the switch structure to be only in one-way conduction when the analog switch is opened so as to stop charging the storage battery when the starter starts the engine. The switch structure is arranged, and the switch structure is controlled to be disconnected by controlling the disconnection of the analog switch through the whole vehicle controller, so that the storage battery and the direct current converter are isolated when the engine is started by the starter. The voltage of the direct current converter is prevented from being lowered when the starter starts the engine, so that the driving safety can be improved, and the direct current converter is prevented from being ablated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic diagram of a starting isolation circuit of a starter according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a starting isolation circuit of a starter according to another embodiment of the present application;
Fig. 3 is a schematic flow chart of a control logic based on a start isolation circuit according to an embodiment of the present application.
Reference numerals:
10-storage battery, 20-direct current converter, 30-switch structure, 301-control end, 31-diode, 32-switch element, 321-first connection end, 322-second connection end, 40-whole vehicle controller, 41-micro control unit, 42-amplifying circuit, 421-triode, 422-capacitor, 50-analog switch, 60-starter, 70-starter relay and 80-low voltage power supply load.
Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The terms "positive", "negative", "third", "fourth", and the like in the description and in the claims of the application and in the foregoing figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The hybrid power system with the single motor coupled to the even shaft of the double clutch transmission can achieve better oil saving effect, and has the advantages of low cost and short development period, so that the hybrid power system is widely applied to the automobile industry.
In a hybrid power system, two engine starting modes, namely motor starting and starter starting, are generally arranged, and are respectively suitable for different automobile working conditions. The motor starting engine is generally used for in-situ starting of an automobile or when the automobile has a certain speed, and the starter starting engine is generally used for lower speed or when the motor, the power battery and the like are in failure. The starter converts the electric energy of the storage battery into mechanical energy to start the flywheel of the engine to rotate so as to realize the starting of the engine. The reliability and stability of the starter start as a backup start mode directly affect the safety of the driving system. The common starter comprises 6V, 12V, 24V starter and the like, and can be configured according to automobile requirements.
In one example, when the vehicle controller of the vehicle receives a start request of the engine, it is determined whether the vehicle meets a condition for starting the engine by the motor according to the current actual vehicle condition, that is, whether the vehicle is started in situ or whether the vehicle speed for starting the motor is met. If the condition of starting the engine by the motor is not met, for example, the speed of the vehicle is low or the motor, the power battery and the like are failed, the whole vehicle controller controls the starter to start the engine so as to start the engine.
When the engine is started by the starter, the whole vehicle controller sends oil injection and ignition instructions to the engine controller, and sends a closing instruction to the relay of the starter, after the relay is closed, the starter starts dragging the engine, and when the engine is dragged to a certain rotating speed, the engine injects oil for ignition, so that the starter starting process is completed.
Wherein, the starter drags the engine, needs the battery to supply power to the starter. However, in the low-voltage circuit of the current hybrid system, the dc converter is connected to the battery, and the dc converter also participates in the starting process. In the transient state of the starter dragging engine, the voltage of the storage battery is pulled down, and meanwhile, the voltage of a direct current converter connected with the storage battery is pulled down. At this time, the whole vehicle controller of the automobile has the risk of power failure, so that the safety of the whole vehicle is reduced, and when the voltage of the direct current converter is lower than a certain value, the direct current converter is also triggered to report an overcurrent fault, and even the risk of ablating the safety of the direct current converter is caused.
In order to solve the problems, the application provides a starting isolation circuit, a device and an automobile of a starter, wherein a switch structure and an analog switch are arranged between a storage battery and a direct current converter, and when the starter starts an engine through a whole vehicle controller, the analog switch is controlled to be turned off, so that the switch structure is only turned on in one direction, and the purpose that the direct current converter cannot be pulled down by the starter when the starter starts the engine is achieved.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a starting isolation circuit of a starter according to an embodiment of the present application. As shown in fig. 1, the starting isolation circuit comprises a storage battery 10, a direct current converter 20, a switch structure 30, a whole vehicle controller 40, an analog switch 50, a starter 60 and a starter relay 70, wherein the switch structure 30 comprises a control end 301.
As shown in fig. 1, the battery 10 is connected to a switch structure 30, the switch structure 30 is connected to the dc converter 20, the vehicle controller 40 is connected to the battery 10 and an analog switch 50, respectively, and the analog switch 50 is connected to a control terminal 301.
The vehicle controller 40 is configured to control the starter relay 70 to be closed and control the analog switch 50 to be opened if it is determined that the engine is started by the starter 60.
The control terminal 301 is configured to control the switch structure 30 to be turned on only in one direction when the analog switch 50 is turned off, so that the dc converter 20 stops charging the battery 10 when the engine is started by the starter 60.
For example, the vehicle controller 40 is a control center of the vehicle, and after the vehicle is powered on at high voltage, if the vehicle controller 40 receives a start request of the engine, the vehicle controller 40 determines whether to start the engine by the starter 60 according to the current actual working condition of the vehicle. If it is determined that the engine is started by the starter 60, the vehicle controller 40 sends a closing command to the starter relay 70 to control the starter relay 70 to be closed so as to enable the battery 10 to supply power to the starter 60, and meanwhile, the vehicle controller 40 also controls the analog switch 50 to be opened so that the control end 301 controls the switch structure 30 to be only turned on unidirectionally, so that the direct current converter 20 stops charging the battery 10, and the voltage of the direct current converter 20 is prevented from being lowered in the transient state that the battery 10 supplies power to the starter 60.
Illustratively, when the analog switch 50 is open, the control terminal 301 controls the switch structure 30 to open, and when the analog switch 50 is closed, the control terminal 301 controls the switch structure 30 to close. The specific implementation of the switch structure 30 is not limited in this application. For example, the circuit can be realized by a diode and a relay which are connected in parallel, or can be realized by a diode and a MOS tube which are connected in parallel, or can be realized by other modes, and the application is not limited. The switch structure 30 of the present application is provided to realize unidirectional conduction of the battery 10 to the dc converter 20 when the switch structure 30 is turned off, so that the battery 10 can supply power to the low-voltage power supply load 80 when the dc converter 20 is not operated, and to charge the battery 10 by the dc converter 20 when the switch structure 30 is turned on.
When the analog switch 50 is turned off, the control terminal 301 controls the switch structure 30 to be turned off, that is, the switch structure 30 only unidirectionally turns on the battery 10 to the dc converter 20, the battery 10 can supply power to the low-voltage power supply load 80, but the dc converter 20 cannot charge the battery 10, so as to achieve the goal of isolating the battery 10 from the dc converter 20 when the engine is started by the starter.
The starting isolation circuit of the starter comprises a storage battery, a direct current converter, a switch structure, a whole vehicle controller, an analog switch, the starter and a starter relay, wherein the switch structure comprises a control end, the storage battery is connected with the switch structure, the switch structure is connected with the direct current converter, the whole vehicle controller is respectively connected with the storage battery and the analog switch, the analog switch is connected with the control end, the whole vehicle controller is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter is determined to start an engine, and the control end is used for controlling the switch structure to be only in one-way conduction when the analog switch is opened, so that the direct current converter stops charging the storage battery when the starter starts the engine. The application controls the switch structure to be disconnected by arranging the switch structure between the storage battery and the direct current converter and controlling the disconnection of the analog switch by the whole vehicle controller, so as to isolate the storage battery from the direct current converter when the engine is started by the starter. The situation that the voltage of the direct current converter is lowered when the engine is started by the starter is avoided, driving safety can be improved, and the direct current converter is prevented from being ablated.
Fig. 2 is a schematic diagram of a starting isolation circuit of a starter according to another embodiment of the present application. As shown in fig. 2, the starting isolation circuit comprises a storage battery 10, a direct current converter 20, a switch structure 30, a whole vehicle controller 40, an analog switch 50, a starter 60 and a starter relay 70, wherein the switch structure 30 comprises a diode 31 and a switch element 32, and the switch element 32 comprises a first connecting end 321, a second connecting end 322 and a control end 301.
As shown in fig. 2, the first connection terminal 321 of the switching element 32 is connected to both the anode of the diode 31 and the battery 10, the second connection terminal 322 of the switching element 32 is connected to both the cathode of the diode 31 and the dc converter 20, the vehicle controller 40 is connected to the battery 10 and the analog switch 50, and the analog switch 50 is connected to the control terminal 301.
The vehicle controller 40 is configured to control the starter relay 70 to be turned on and the analog switch 50 to be turned off when determining that the engine is started by the starter 60, the control terminal 301 is configured to turn off the switching element 32 when the analog switch 50 is turned off, so that the dc converter 20 stops charging the battery 10 when the engine is started by the starter 60, and the diode 31 is configured to realize unidirectional conduction from the battery 10 to the dc converter 20.
For example, after the vehicle is powered up at high voltage, if the vehicle controller 40 determines that the starter 60 starts the engine, the vehicle controller 40 controls the starter relay 70 to be closed so as to supply the starter 60 with power from the battery 10, and simultaneously, the vehicle controller 40 controls the analog switch 50 to be opened so that the control terminal 301 controls the first connection terminal 321 and the second connection terminal 322 of the switching element 32 to be opened, so that the dc converter 20 stops charging the battery 10, and the battery 10 is only turned on to the dc converter 20 in one direction through the diode 31, so that the battery 10 can still supply the low-voltage power supply load 80 with power. Therefore, the starting isolation of the starter is realized, and the influence on the whole power supply loop when the starter starts the engine is reduced.
Illustratively, the diode has unidirectional conductivity. The application sets the diode 31 in the switch structure 30, which can realize the unidirectional conduction from the accumulator 10 to the DC converter 20, so that the accumulator 10 can supply power to the low-voltage power supply load 80 when the DC converter 20 is not in operation. In addition, the switching structure 30 further comprises a switching element 32, the switching element 32 comprising a control terminal 301, the control terminal 301 being arranged to control the connection between the first connection terminal 321 and the second connection terminal 322.
When the analog switch 50 is turned off, the control terminal 301 controls the first connection terminal 321 and the second connection terminal 322 to be turned off, and when the analog switch 50 is turned on, the control terminal 301 controls the first connection terminal 321 and the second connection terminal 322 to be turned on. When the first connection terminal 321 and the second connection terminal 322 are disconnected, unidirectional conduction from the battery 10 to the dc converter 20 is realized through the diode 31, so that the battery 10 supplies power to the low-voltage power supply load 80, and the dc converter 20 cannot charge the battery 10 at this time, and when the first connection terminal 321 and the second connection terminal 322 are closed, conduction from the dc converter 20 to the battery 10 is realized, and the dc converter 20 can charge the battery 10.
Wherein the analog switch 50 in the present application may be a normally closed switch.
In one example, the switching element 32 includes a MOS transistor, a source electrode of the MOS transistor is a first connection end 321, a drain electrode of the MOS transistor is a second connection end 322, a gate electrode of the MOS transistor is a control end 301, and the gate electrode of the MOS transistor is used to turn off the MOS transistor when the analog switch 50 is turned off, so that the dc converter stops charging the battery when the engine is started by the starter.
For example, when the analog switch 50 is turned off, the gate of the MOS transistor is grounded, and at this time, the MOS transistor is turned off, so as to isolate the battery 10 from the dc converter 20, and at this time, the dc converter 20 cannot charge the battery 10. When the analog switch 50 is turned on, the gate of the MOS transistor turns on the source and the drain, and the DC converter 20 can charge the battery 10.
If the switching element 32 includes a MOS transistor, and the gate of the MOS transistor controls the on or off of the MOS transistor, when the analog switch 50 is turned on, the whole vehicle controller further provides a control voltage greater than the source voltage to the gate of the MOS transistor in order to realize the on of the source and the drain of the MOS transistor.
The MOS tube has the advantages of good response real-time performance, long service life and the like, on one hand, the control efficiency of the whole starting isolation circuit can be improved, and on the other hand, the influence on the direct current converter when the starter starts the engine can be reduced as much as possible.
In one example, the vehicle controller 40 is further configured to close or open the analog switch 50 according to the electric quantity of the battery 10 after the start control of the starter 60 is completed, so that the dc converter 20 charges or does not charge the battery 10, where the vehicle controller 40 is further configured to provide a control voltage capable of controlling the switch structure 30 to be closed to the control terminal 301 when the analog switch 50 is closed, so that the dc converter 20 charges the battery 10.
For example, when the starting control of the starter 60 is completed, neither the battery 10 nor the dc converter 20 is pulled down by the starter 60, and at this time, the battery 10 and the dc converter 20 may be normally connected or disconnected as needed to achieve the charge/discharge control of the battery.
For example, when the electric quantity of the storage battery is high, the continuous charging may generate gassing due to the excessive voltage, the service life of the storage battery is reduced, the charging efficiency is reduced, and the energy consumption may become large. Therefore, it is necessary to control the charge and discharge of the low-voltage battery.
For example, the vehicle controller 40 may monitor the electric quantity of the battery 10 in real time, and after the starting control of the starter 60 is completed, the vehicle controller 40 may determine whether the battery 10 needs to be charged according to the electric quantity of the battery 10, and close or open the analog switch 50 to charge or not charge the battery 10 by the dc converter 20. When the battery 10 needs to be charged, the vehicle controller 40 controls the analog switch 50 to be turned on, and provides a control voltage for the control terminal 301, which can control the switch structure 30 to be turned on, so that the dc converter 20 charges the battery 10. When the battery 10 does not need to be charged, the vehicle controller 40 controls the analog switch 50 to be turned off, so that the direct current converter 20 stops charging the battery 10.
The electric quantity of the battery 10 may be obtained by various modes such as a battery monitoring sensor, a battery monitoring system, and the like, which is not limited by the present application. In one example, the starting isolation circuit further includes a battery monitoring sensor (not shown in the drawings) connected to the battery 10, the battery monitoring sensor being configured to monitor the electric quantity of the battery 10 and provide the electric quantity information of the battery to the vehicle controller 40.
Illustratively, the battery monitoring sensor monitors the electric quantity information of the battery 10 in real time and sends the real-time electric quantity information to the vehicle controller 40, so that the vehicle controller 40 can control the charge and discharge of the battery 10 according to the electric quantity of the battery 10 in time after the starting control of the starter 60 is completed.
The present application does not limit how the vehicle controller 40 provides the control voltage for the control terminal 301 to control the switch structure 30 to be closed. For example, the vehicle controller 40 may include an amplifying circuit, which provides a control voltage to the control terminal 301, or may be implemented in other possible manners.
In one example, the vehicle controller 40 includes a micro control unit 41 and an amplifying circuit 42.
As shown in fig. 2, the micro control unit 41 is connected to the analog switch 50 and the input terminal of the amplifying circuit 42, respectively, the input terminal of the amplifying circuit 42 is also connected to the battery 10, and the output terminal of the amplifying circuit 42 is connected to the analog switch 50.
The micro control unit 41 is configured to control the starter relay 70 to be closed and control the analog switch 50 to be opened, if it is determined that the engine is started by the starter 60.
The micro control unit 41 is further configured to close or open the analog switch 50 according to the amount of electricity of the battery 10 after the start control of the starter 60 is completed, so that the dc converter 20 charges or does not charge the battery 10.
The amplifying circuit 42 is configured to provide a control voltage to the control terminal 301 capable of controlling the switch structure 30 to be closed when the analog switch 50 is closed, so that the dc converter 20 charges the battery 10.
For example, after the automobile is powered up at high voltage, if the micro control unit 41 determines that the starter 60 starts the engine, the micro control unit 41 controls the starter relay 70 to be closed so as to enable the battery 10 to supply power to the starter 60, and simultaneously, the micro control unit 41 also controls the analog switch 50 to be opened so as to enable the control terminal 301 to control the switching element 32 in the switching structure 30 to be opened, so that the direct current converter 20 stops charging the battery 10, and at the moment, the battery 10 is only turned on to the direct current converter 20 in a unidirectional way through the diode 31, so that the battery 10 can still supply power to the low voltage power supply load 80. Therefore, the starting isolation of the starter is realized, and the influence on the whole power supply loop is reduced.
The micro control unit 41 is also used to realize charge and discharge control of the battery 10 when the start control of the starter 60 is completed. Illustratively, the micro-control unit 41 may determine whether the battery 10 needs to be charged according to the electric quantity of the battery 10, so as to control the analog switch 50 to be turned on or off, thereby controlling the dc converter 20 to charge or not charge the battery 10. When the storage battery 10 needs to be charged, the micro control unit 41 controls the analog switch 50 to be closed, and provides a PWM control signal for the amplifying circuit 42. The amplifying circuit 42 regulates the voltage input from the battery 10 according to the PWM control signal so that the output control voltage can cause the control terminal 301 to control the switching element 32 in the switching structure 30 to be closed. When the control terminal 301 receives a control voltage that can control the switching element 32 in the switching structure 30 to be closed, the switching element 32 is controlled to be closed, so that the dc converter 20 charges the storage battery 10. When the battery 10 does not need to be charged, the micro control unit 41 controls the analog switch 50 to be turned off, and at this time, the control terminal 301 is grounded, the switch structure 30 is turned off, and the dc converter 20 stops charging the battery 10.
The application is not limited to a specific value of the control voltage capable of controlling the switch structure to be closed. For example, if the switch structure includes an MOS transistor, the gate of the MOS transistor controls the turn-on of the MOS transistor, so that the voltage reaching the gate is ensured to be greater than the source voltage, and at this time, the MOS transistor is turned on.
In one example, the amplifying circuit 42 includes a triode 421, the base of the triode 421 is an input terminal of the amplifying circuit 42, the collector of the triode 421 is an output terminal of the amplifying circuit 42, and the emitter of the triode 421 is grounded, and the triode 421 is used for providing a control voltage capable of controlling the switch structure 30 to be closed to the control terminal 301 when the analog switch 50 is closed, so that the direct current converter 20 charges the storage battery 10.
Illustratively, the transistor 421 may regulate the voltage input by the battery 10 according to the PWM control signal provided by the micro-control unit 41, and the control output voltage is stabilized at a control voltage capable of controlling the switch structure 30 to be closed.
In one example, the amplifying circuit 42 further includes a capacitor 422, one end of the capacitor 422 is connected to the collector of the triode 421, the other end of the capacitor 422 is grounded, and the capacitor 422 is used for filtering the control voltage.
Illustratively, as shown in fig. 2, the amplifying circuit 42 may further include a capacitor 422, one end of the capacitor 422 is connected to the collector of the triode 421, and the other end of the capacitor 422 is grounded. The capacitor 422 can filter the control voltage output by the triode 421 and capable of controlling the switch structure 30 to be closed, so that the output control voltage is more stable, and the control effect is improved.
In addition, in the starting isolation circuit of the present application, a diode may be provided at any necessary position to realize unidirectional conduction between the devices, and the present application is not limited.
According to the starting isolation circuit of the starter, the switch structure is arranged between the storage battery and the direct-current converter, and the switch structure is controlled to be disconnected by controlling the disconnection of the analog switch through the whole vehicle controller, so that the storage battery and the direct-current converter are isolated when the starter starts an engine, the situation that the voltage of the direct-current converter is pulled down when the starter starts the engine is avoided, driving safety is improved, and meanwhile the direct-current converter is protected from being ablated. In addition, the starting isolation circuit of the starter provided by the embodiment of the application can also be used for controlling the charge and discharge of the storage battery, and has higher practicability.
Fig. 3 is a schematic flow chart of a control logic based on a start isolation circuit according to an embodiment of the present application.
The following describes the control flow of the battery charge and discharge and the starting isolation of the starter in the present application in 3 cases based on the starting isolation circuit of the starter shown in fig. 2, with reference to fig. 3.
For example, when the vehicle is powered on at low voltage, the analog switch 50 in the starting isolation circuit of the starter is in a normally closed state, so that the gate voltage of the MOS transistor in the switch structure 30 is higher than the source voltage after the vehicle is powered on at low voltage, the battery 10 is conducted with the dc converter 20, the dc converter 20 cannot output electric energy and cannot charge the battery 10 because no high voltage is applied, and the whole vehicle low voltage energy consumption is provided by the battery 10.
For example, when the vehicle is powered up at high voltage, but the engine is not started with the starter, the starting isolation circuit is used only to complete the charge-discharge control of the battery 10. In this condition, the whole vehicle controller 40 receives the electric quantity information of the battery 10, and determines whether charging is required according to the electric quantity of the battery 10. If the dc converter 20 is required to charge the battery 10, the analog switch 50 is kept in a normally-closed state, and at this time, the gate voltage of the MOS transistor is higher than the source voltage, the source and the drain of the MOS transistor are turned on, the voltage of the low-voltage terminal of the dc converter 20 is higher than the voltage of the battery 10, and the dc converter 20 supplies electric energy to the low-voltage load and simultaneously charges the battery 10. When the direct current converter 20 is not needed to charge the storage battery 10, the vehicle controller 40 controls the analog switch 50 to be turned off, at the moment, the grid electrode of the MOS tube is grounded, the source electrode and the drain electrode are turned off, the direct current converter 20 is turned off from the storage battery 10 only through one-way conduction of the diode, and the direct current converter 20 stops charging the storage battery 10.
When the vehicle is powered up at high voltage, the engine is started by using a starter, and the starting isolation circuit is used for completing charge and discharge control of the storage battery 10, under the working condition, when the storage battery 10 does not need to be charged, the analog switch 50 is controlled to be opened, so that the direct current converter 20 is isolated from the storage battery 10, and at the moment, the direct current converter 20 can independently supply power to the low-voltage load of the whole vehicle, when the storage battery 10 needs to be charged, the analog switch 50 is controlled to be closed, so that the direct current converter 20 is conducted with the storage battery 10, and the direct current converter 20 supplies power to the low-voltage load of the whole vehicle and simultaneously charges the storage battery 10. When the starter 60 is determined to be needed to start the engine, the analog switch 50 is controlled to be disconnected, the grid electrode of the MOS tube is grounded, the source electrode and the drain electrode are cut off at the moment, the isolation between the direct current converter 20 and the storage battery 10 is realized only through one-way conduction of the diode, the direct current converter 20 stops charging the storage battery 10, after the starter relay 70 is closed at the moment, the storage battery 10 independently supplies power to the starter 60, the direct current converter 20 supplies power to a low-voltage load of the whole vehicle, the situation that the voltage of the low-voltage end of the direct current converter 20 is lowered when the starter 60 lowers the voltage of the storage battery 10 is avoided, and after the engine speed is dragged to a certain speed by the starter 60, the engine is injected with fuel to ignite, so that the control of the starter 60 to start the engine is completed. Then, the state of the analog switch 50 is determined according to whether the storage battery 10 needs to be charged, and the conduction state of the source electrode and the drain electrode of the MOS tube is further determined.
The starting isolation circuit of the starter provided by the embodiment of the application not only can realize the starting isolation of the starter, but also can realize the charge and discharge control of the storage battery, and improves the practicability and the safety.
In addition, the embodiment of the application also provides a starting isolation device of the starter, which comprises the starting isolation circuit provided by any one embodiment.
Further, the embodiment of the application also provides an automobile, which comprises the starting isolation circuit provided by any one of the embodiments.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. A starting isolation circuit of a starter is characterized by comprising a storage battery, a direct current converter, a switch structure, a whole vehicle controller, an analog switch, the starter and a starter relay, wherein the switch structure comprises a control end;
the whole vehicle controller is respectively connected with the storage battery and the analog switch, and the analog switch is connected with the control end;
The whole vehicle controller is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter starts the engine;
The control end is used for controlling the switch structure to be only in one-way conduction when the analog switch is disconnected, so that the direct current converter stops charging the storage battery when the starter starts the engine;
The whole vehicle controller is also used for closing or opening the analog switch according to the electric quantity of the storage battery after the starting control of the starter is completed, so that the direct current converter charges or does not charge the storage battery;
When the analog switch is closed, the whole vehicle controller also provides a control voltage for the control end, wherein the control voltage can control the switch structure to be closed, so that the direct current converter charges the storage battery;
the whole vehicle controller comprises a micro control unit and an amplifying circuit;
The micro control unit is respectively connected with the analog switch and the input end of the amplifying circuit, the input end of the amplifying circuit is also connected with the storage battery, and the output end of the amplifying circuit is connected with the analog switch;
the micro control unit is used for controlling the starter relay to be closed and controlling the analog switch to be opened if the starter is determined to start the engine;
the micro control unit is also used for closing or opening the analog switch according to the electric quantity of the storage battery after the starting control of the starter is completed, so that the direct current converter charges or does not charge the storage battery;
The amplifying circuit is used for providing a control voltage for the control end when the analog switch is closed, and the control voltage can control the switch structure to be closed so as to enable the direct current converter to charge the storage battery.
2. The starting isolation circuit of claim 1, wherein the switching structure comprises a diode and a switching element, the switching element comprising a first connection terminal, a second connection terminal, and a control terminal;
The first connecting end is connected with the anode of the diode and the storage battery, and the second connecting end is connected with the cathode of the diode and the direct current converter;
the diode is used for realizing unidirectional conduction from the storage battery to the direct-current converter;
the control terminal is configured to turn off the switching element when the analog switch is turned off, so that the direct current converter stops charging the battery when the engine is started by the starter.
3. The starting isolation circuit according to claim 2, wherein the switching element comprises a MOS transistor, a source of the MOS transistor is the first connection terminal, a drain of the MOS transistor is the second connection terminal, and a gate of the MOS transistor is the control terminal;
And the grid electrode of the MOS tube is used for cutting off the MOS tube when the analog switch is disconnected, so that the direct current converter stops charging the storage battery when the starter starts the engine.
4. The starting isolation circuit of claim 1, wherein the amplifying circuit comprises a triode, a base electrode of the triode is an input end of the amplifying circuit, a collector electrode of the triode is an output end of the amplifying circuit, and an emitter electrode of the triode is grounded;
And the triode is used for providing a control voltage capable of controlling the switch structure to be closed for the control end when the analog switch is closed, so that the direct current converter charges the storage battery.
5. The starting isolation circuit of claim 4, wherein the amplifying circuit further comprises a capacitor, one end of the capacitor is connected to the collector of the triode, the other end of the capacitor is grounded, and the capacitor is used for filtering the control voltage.
6. The starting isolation circuit of claim 1, further comprising a battery monitoring sensor connected to the battery, the battery monitoring sensor configured to monitor an electrical quantity of the battery and provide electrical quantity information of the battery to the vehicle controller.
7. A starting isolation device of a starter, characterized by comprising a starting isolation circuit as claimed in any one of claims 1-6.
8. An automobile comprising the start isolation circuit of any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211406200.8A CN115573843B (en) | 2022-11-10 | 2022-11-10 | Starter isolation circuit, device and automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211406200.8A CN115573843B (en) | 2022-11-10 | 2022-11-10 | Starter isolation circuit, device and automobile |
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| CN115573843A CN115573843A (en) | 2023-01-06 |
| CN115573843B true CN115573843B (en) | 2025-02-11 |
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| CN202211406200.8A Active CN115573843B (en) | 2022-11-10 | 2022-11-10 | Starter isolation circuit, device and automobile |
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| CN116412053B (en) * | 2023-05-19 | 2024-10-22 | 长城汽车股份有限公司 | Mixed motor vehicle control method and system and mixed motor vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107850032A (en) * | 2015-07-09 | 2018-03-27 | 戴姆勒股份公司 | Integrated starter current control device and onboard power system disconnect switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3959709B2 (en) * | 2001-11-27 | 2007-08-15 | 株式会社デンソー | Automotive power supply |
| CN102748183A (en) * | 2012-03-01 | 2012-10-24 | 浙江智慧电装有限公司 | Automobile starter starting protection device |
| JP2015063933A (en) * | 2013-09-25 | 2015-04-09 | 日産自動車株式会社 | Start control unit of engine |
| JP5997199B2 (en) * | 2014-03-31 | 2016-09-28 | 本田技研工業株式会社 | Electric supply device and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107850032A (en) * | 2015-07-09 | 2018-03-27 | 戴姆勒股份公司 | Integrated starter current control device and onboard power system disconnect switch |
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