CN110979221A

CN110979221A - Power supply control method and device for vehicle and vehicle

Info

Publication number: CN110979221A
Application number: CN201911369553.3A
Authority: CN
Inventors: 谢璞光; 张培松; 郭亚强; 郝晓峰; 柴浩; 范宇希; 王素丰; 马自刚; 郝丽惠; 张洪宁; 赵江涛; 刘旭杰
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-04-10

Abstract

The invention provides a power supply control method and device of a vehicle and the vehicle, wherein the power supply control method of the vehicle is applied to the vehicle, the vehicle comprises a starter, an engine, a generator, a main battery and a load circuit, the starter and the generator are mechanically connected with the engine, the starter is used for starting the engine, the generator is driven by the engine to generate power, the starter and the load circuit are electrically connected with the main battery, the generator is electrically connected with the load circuit, the vehicle also comprises an auxiliary battery, and the auxiliary battery is electrically connected with the load circuit. When the engine is started through the starter, the auxiliary battery replaces the main battery to supply power to the load circuit, so that the voltage stability of the load circuit can be maintained, the voltage input to the load circuit cannot be lowered due to the operation of the starter, the voltage stabilizing effect on the load circuit is equivalently realized, and the condition that the load circuit is restarted due to insufficient voltage is avoided.

Description

Power supply control method and device for vehicle and vehicle

Technical Field

The invention relates to the technical field of automobiles, in particular to a power supply control method and device for a vehicle and the vehicle.

Background

Currently, when a vehicle is started, a battery is required to supply power to a starter so as to start an engine. Meanwhile, the storage battery also needs to supply power to load circuits such as the electric circuit and the network of the whole vehicle.

In the prior art, the starter and the load circuit are both supplied with power by the storage battery, so that in the starting process of the engine, the supply voltage of the storage battery to the load circuit is reduced due to the working of the starter, the voltage of the load circuit is insufficient, and when the voltage of the load circuit is lower than a certain voltage value, the restart of electrical loads such as a host, an instrument, an automatic gearbox control unit and the like can be caused, so that the driving feeling of a driver can be influenced, and the inconvenience is easily brought to the driver.

Disclosure of Invention

In view of this, the present invention is directed to a power control method and system for a vehicle, and a vehicle, so as to solve the problem that a load circuit is easily restarted due to insufficient voltage when an engine of an existing vehicle is started.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a power supply control method of a vehicle is applied to the vehicle, the vehicle comprises a starter, an engine, a generator, a main battery and a load circuit, the starter and the generator are mechanically connected with the engine, the starter and the load circuit are electrically connected with the main battery, the generator is electrically connected with the load circuit, the vehicle further comprises a secondary battery, and the secondary battery is electrically connected with the load circuit, the method comprises the following steps:

controlling the main battery to supply power to the load circuit when the vehicle is in a power-on state and the engine is not started;

when the vehicle is in a power-on state and a starting signal is detected, controlling the auxiliary battery to supply power to the load circuit, controlling the main battery to stop supplying power to the load circuit, and controlling the main battery to supply power to the starter so as to start the engine;

after the engine is started, the engine is controlled to drive the generator to generate power, the generator and the main battery are controlled to supply power to the load circuit, and the auxiliary battery is controlled to stop supplying power to the load circuit.

Further, in the power supply control method, the main battery and the sub-battery are both electrically connected to the generator, and the method further includes:

when the vehicle is in a power-on state, acquiring a current first voltage value of the auxiliary battery and a current state of charge value of the main battery;

when the first voltage value is smaller than a first preset voltage threshold value, if the engine is started, controlling the generator to charge the secondary battery;

and when the state of charge value is smaller than a first preset charge threshold value, if the engine is started, controlling the generator to charge the main battery.

Further, in the power supply control method, the main battery is electrically connected to a sub-battery;

after acquiring the current first voltage value of the auxiliary battery and the current state of charge value of the main battery when the vehicle is in a power-on state, the method further comprises the following steps:

when the first voltage value is smaller than a second preset voltage threshold and the engine is not started, if the state of charge value is larger than a second preset charge threshold, controlling the main battery to charge the auxiliary battery; the second preset voltage threshold is smaller than the first preset voltage threshold, and the second preset charge threshold is larger than the first preset charge threshold.

Further, the method further comprises:

and when the vehicle is in a braking state, controlling the generator to generate power according to a preset upper limit voltage value, wherein the preset upper limit voltage value is the maximum value in the power generation voltage range of the generator.

Further, the method further comprises:

when the vehicle is in a braking state, if the first voltage value is smaller than a third preset voltage threshold value, controlling the generator to charge the secondary battery; wherein the third preset voltage threshold is greater than the first preset voltage threshold;

when the vehicle is in a braking state, if the state of charge value is smaller than a third preset state of charge threshold value, controlling the generator to charge the main battery; wherein the third preset charge threshold is greater than the second preset charge threshold.

Further, in the power control method, the vehicle further includes an emergency help system, and the main battery, the auxiliary battery, and the generator are all electrically connected to the emergency help system, and the method further includes:

and after the collision signal is detected, if the voltage output signal of the generator is not detected and the voltage output signal of the main battery is not detected, controlling the auxiliary battery to supply power for the emergency help-seeking system.

Another objective of the present invention is to provide a power control device for a vehicle, which is applied to a vehicle, the vehicle includes a starter, an engine, a generator, a main battery and a load circuit, the starter and the generator are both mechanically connected to the engine, the starter and the load circuit are both electrically connected to the main battery, the generator is electrically connected to the load circuit, the device includes a sub-battery and a microcontroller, the sub-battery is electrically connected to the load circuit, the generator, the main battery and the sub-battery are all communicatively connected to the microcontroller, and the microcontroller is configured to:

Further, the apparatus further includes a first switch provided between the main battery and the load circuit, the generator being electrically connected to the load circuit via the first switch, and a second switch provided between a connection line of the first switch and the load circuit and the sub-battery;

the microcontroller is specifically configured to:

when the vehicle is in a power-on state and the engine is not started, controlling the first switch to be closed and controlling the second switch to be opened so as to control the main battery to supply power to the load circuit;

when the vehicle is in a power-on state and a starting signal is detected, controlling the first switch to be switched off, and controlling the second switch to be switched on, so as to control the main battery to stop supplying power to the load circuit, and control the main battery to supply power to the starter, so as to start the engine;

after the engine is started, the engine is controlled to drive the generator to generate power, the first switch is controlled to be closed, the second switch is controlled to be opened, the generator and the main battery are controlled to supply power to the load circuit, and the auxiliary battery is controlled to stop supplying power to the load circuit.

Further, in the device, the main battery is electrically connected to the generator, the sub-battery is electrically connected to the generator through the first switch and the second switch, and the microcontroller is further configured to:

when the vehicle is in a power-on state, acquiring a current first voltage value of the auxiliary battery and a current state of charge of the main battery;

when the first voltage value is smaller than a first preset voltage threshold value, if the engine is started, controlling the first switch and the second switch to be closed so as to control the generator to charge the secondary battery;

and when the state of charge value is smaller than a first preset charge threshold value, if the engine is started, controlling a first switch to be closed, and controlling the generator to charge the main battery.

Further, in the device, the main battery is electrically connected to the sub-battery through the first switch and the second switch, and the microcontroller is further configured to:

when the first voltage value is smaller than a second preset voltage threshold and the engine is not started, if the state of charge value is larger than the second preset state of charge threshold, controlling the first switch and the second switch to be closed so as to control the main battery to charge the auxiliary battery; the second preset voltage threshold is smaller than the first preset voltage threshold, and the second preset charge threshold is larger than the first preset charge threshold.

Further, in the apparatus, the microcontroller is further configured to:

when the vehicle is in a braking state, if the first voltage value is smaller than a third preset voltage threshold value, controlling the first switch and the second switch to be closed so as to enable the generator to charge the secondary battery; wherein the third preset voltage threshold is greater than the first preset voltage threshold;

when the vehicle is in a braking state, if the state of charge value is smaller than a third preset state of charge threshold value, controlling the first switch to be closed, and controlling the generator to charge the main battery; wherein the third preset charge threshold is greater than the second preset charge threshold.

Further, in the device, the vehicle further includes an emergency help system, the generator and the main battery are both electrically connected to the emergency help system, the device further includes a third switch, the auxiliary battery is electrically connected to the emergency help system through the third switch, and the microcontroller is further configured to:

after the collision signal is detected, if the voltage output signal of the generator is not detected and the voltage output signal of the main battery is not detected, the third switch is controlled to be closed so as to control the auxiliary battery to supply power for the emergency help-seeking system.

Compared with the prior art, the power supply control method and the power supply control device for the vehicle have the following advantages that:

when the vehicle is in a power-on state and the engine is not started, controlling the main battery to supply power to the load circuit; when the vehicle is in a power-on state and a starting signal is detected, the auxiliary battery is controlled to supply power to the load circuit, the main battery is controlled to stop supplying power to the load circuit, and the main battery is controlled to supply power to the starter so as to start the engine; after the engine is started, the generator is driven by the engine to generate power, the generator and the main battery are controlled to supply power to the load circuit, and the auxiliary battery is controlled to stop supplying power to the load circuit. Because the load circuit is powered by the main battery when the engine is not started; when the engine is started through the starter, the auxiliary battery replaces the main battery to supply power for the load circuit, so that the voltage stability of the load circuit can be maintained, the voltage input to the load circuit cannot be reduced due to the running of the starter, the voltage stabilizing effect on the load circuit is equivalently realized, the condition that the load circuit is restarted due to insufficient voltage is avoided, and the problem that the load circuit is restarted due to insufficient voltage easily occurs when the engine of the existing vehicle is started is solved. In addition, the scheme has a simple structure, and a large number of electronic components are not required.

It is a further object of the present invention to provide a vehicle including the power supply control apparatus of the vehicle.

The vehicle and the power supply control method and device of the vehicle have the same advantages compared with the prior art, and are not repeated herein.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic flowchart of a power control method for a vehicle according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a power control method for a vehicle according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a power supply control apparatus for a vehicle according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a work flow of a vehicle starting process according to an embodiment of the present invention;

FIG. 5 is a schematic view of a work flow of the vehicle in an un-started state according to an embodiment of the present invention;

fig. 6 is a schematic flowchart of a work flow of the vehicle in an un-started state according to the embodiment of the present invention.

Detailed Description

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, a power control method for a vehicle according to an embodiment of the present invention is shown, and is applied to a vehicle, where the vehicle includes a starter, an engine, a generator, a main battery, and a load circuit, where the starter and the generator are both mechanically connected to the engine, the starter is used to start the engine, the generator is driven by the engine to generate power, the starter and the load circuit are both electrically connected to the main battery, the generator is electrically connected to the load circuit, the vehicle further includes a secondary battery, and the secondary battery is electrically connected to the load circuit, where the method includes steps S101 to S103.

In the embodiment of the present invention, the instruction corresponding to each control action may be transmitted through a Controller Area Network (CAN), a Local Interconnect Network (LIN), or another communication protocol.

In the embodiment of the invention, the main battery can be a storage battery and the like; the secondary battery can be a lithium battery, and specifically, the secondary battery can be formed by connecting 3 loose 18650 lithium batteries with the capacity of 1200mAh in series.

And S101, controlling the main battery to supply power to the load circuit when the vehicle is in a power-on state and the engine is not started.

The power-on state refers to a state that the vehicle is awakened, and the engine is not started, i.e. the vehicle is not in the vehicle. In step S101, when the load circuit needs electricity and the engine is not operating, the load circuit is supplied with power from the main battery according to the power demand of the load circuit. At this time, the sub-battery does not supply power to the load circuit.

And S102, when the vehicle is in a power-on state and a starting signal is detected, controlling the auxiliary battery to supply power to the load circuit, controlling the main battery to stop supplying power to the load circuit, and controlling the main battery to supply power to the starter so as to start the engine.

When a starting signal is detected, the engine needs to be started currently; the engine needs to be started by the starter, so that power needs to be supplied to the starter to control the starter to start the engine. Considering that the driving voltage required by the starter is higher, and the main battery is currently supplying power to the load circuit, if the starter is directly supplied with power by the main battery, the voltage transmitted by the main battery to the load circuit becomes lower, and the load electrical appliance on the load circuit is restarted due to insufficient voltage.

In step S102, when the vehicle is in a power-on state and a start signal is detected, the state that the main battery originally supplies power to the load circuit is controlled to be switched to the state that the auxiliary battery supplies power to the load circuit according to the required power of the load circuit, so that the main battery can no longer supply power to the load circuit, and the main battery is controlled to supply power only to the starter. The steps not only can enable the starter to start the engine more smoothly, but also can maintain the stability of the voltage of the load circuit because the auxiliary battery supplies power to the load circuit in the working process of the starter, and the voltage input to the load circuit cannot be pulled down due to the running of the starter, so that the condition that the load circuit is restarted due to insufficient voltage is avoided.

And step S103, after the engine is started, controlling the engine to drive the generator to generate power, controlling the generator and the main battery to supply power to the load circuit, and controlling the auxiliary battery to stop supplying power to the load circuit.

In step S103, since the starter does not work any more after the engine is started, the main battery does not need to supply power to the starter; and after the engine finishes starting, the engine can drive the generator to generate electricity, so the engine and the main battery can jointly supply power for the load circuit at the moment, and the electric quantity of the auxiliary battery is saved, so that the electric quantity of the auxiliary battery can supply power for the load circuit when the engine is started as many times as possible, namely, the charging times of the auxiliary battery can be relatively reduced, and the service life of the auxiliary battery is further prolonged.

In practical application, when the generator and the main battery are controlled to jointly supply power to the load circuit, the generator mainly supplies power to the load circuit. Because the output power of the engine is changed from small to large in the starting process of the engine, correspondingly, the voltage generated by the generator is also changed from small to large, and the voltage output by the generator cannot meet the requirement of a load circuit instantly, when the output voltage of the generator does not reach the required power of the load circuit, the main battery supplies power to the motor at the same time, and the generator and the main battery provide driving electric energy for the load circuit together.

Compared with the prior art, the power supply control method of the vehicle has the following advantages:

when the vehicle is in a power-on state and the engine is not started, controlling the main battery to supply power to the load circuit; when the vehicle is in a power-on state and a starting signal is detected, the auxiliary battery is controlled to supply power to the load circuit, the main battery is controlled to stop supplying power to the load circuit, and the main battery is controlled to supply power to the starter so as to start the engine; after the engine is started, the generator is driven by the engine to generate power, the generator and the main battery are controlled to supply power to the load circuit, and the auxiliary battery is controlled to stop supplying power to the load circuit. Because the load circuit is powered by the main battery when the engine is not started; when the engine is started through the starter, the auxiliary battery replaces the main battery to supply power for the load circuit, so that the voltage of the load circuit can be kept stable, the voltage input to the load circuit cannot be pulled down due to the running of the starter, the condition that the load circuit is restarted due to insufficient voltage is avoided, and the problem that the load circuit is restarted due to insufficient voltage when the engine of the existing vehicle is started is solved. In addition, the scheme has a simple structure, and a large number of electronic components are not required.

Optionally, in the power control method for a vehicle according to the embodiment of the present invention, both the main battery and the sub-battery are electrically connected to the generator, and the power control method for a vehicle further includes steps S104 to S106.

And step S104, when the vehicle is in a power-on state, acquiring a current first voltage value of the auxiliary battery and a current state of charge value of the main battery.

In step S104, the first voltage value refers to voltage values at two ends of the positive electrode and the negative electrode of the secondary battery, that is, the output voltage value. In the step, a current first voltage value of the secondary battery is obtained, so that the electric quantity of the secondary battery is measured by using the first voltage value. Because the electric capacity of the secondary battery is relatively small, the detection is not accurate enough through the traditional state of charge value, and the electric quantity of the secondary battery can be reflected more accurately through the first voltage value.

In practical application, the first voltage value can be obtained by directly detecting the voltage values at the two ends of the anode and the cathode of the secondary battery through the voltage detection device.

In step S104, the remaining capacity of the main battery is measured by the state of charge value because the capacity of the main battery is relatively large.

In practical applications, the state of charge value may be obtained by directly detecting the main battery through a battery sensor.

And S105, when the first voltage value is smaller than a first preset voltage threshold value, if the engine is started, controlling the generator to charge the secondary battery.

In the step S105, the first preset voltage threshold is a nominal voltage value of the secondary battery, and if the first voltage value of the secondary battery is smaller than the first preset voltage threshold, it indicates that the electric quantity of the secondary battery is insufficient, so that if the engine has been started, the engine can drive the generator to generate electricity, and the generator charges the secondary battery until the first voltage value of the secondary battery reaches the first preset voltage threshold. In practical application, the first preset voltage threshold needs to be calibrated according to the actual condition of the whole vehicle, and may be set to 12V, for example.

In practical applications, the specific operations of step S105 are: when the first voltage value is detected to be smaller than a first preset voltage threshold value, whether the engine is started or not is detected; if the engine is started at the moment, controlling the generator to charge the secondary battery for 5min, and then detecting whether the first voltage value reaches a first preset voltage threshold value; if the first voltage value reaches a first preset voltage threshold value, controlling the generator to stop charging the auxiliary battery; if the first voltage value does not reach a first preset voltage threshold value, continuing to detect whether the generator is started, and if the engine is started, controlling the generator to charge the auxiliary battery for 5min and repeating subsequent operations; and if the engine is not started, ending the process, namely, not controlling the generator to charge the secondary battery.

And S106, when the state of charge value is smaller than a first preset charge threshold value, if the engine is started, controlling the generator to charge the main battery.

In the step S106, the first preset soc threshold is a lower limit of a preset soc range of the main battery, and the preset soc range is a value range that can ensure normal use of the main battery. When the current state of charge value of the main battery is smaller than the first preset charge threshold value, the fact that the electric quantity of the main battery is insufficient is indicated, and the main battery needs to be charged in time in order to guarantee that the main battery can be normally used. Therefore, under the condition that the engine is started, the generator can be driven by the engine to generate power, and then the main battery is charged by the generator until the state of charge value of the main battery reaches the charge value limit. In practical application, the first preset charge threshold value needs to be calibrated according to the actual condition of the whole vehicle.

In practical applications, the specific operations of step S106 are: when the state of charge value is smaller than a first preset charge threshold value, detecting whether the engine is started; if the engine is started at the moment, controlling the generator to charge the main battery for 5min, and then detecting whether the state of charge value reaches a first preset charge threshold value; if the state of charge value reaches a first preset charge threshold value, controlling the generator to stop charging the auxiliary battery; if the state of charge value does not reach the first preset charge threshold value, continuing to detect whether the generator is started, and if the engine is started, controlling the generator to charge the auxiliary battery for 5min and repeating subsequent operations; and if the engine is detected not to be started, ending the process, namely, not controlling the generator to charge the main battery any more.

Through the above steps S104 to S106, when the electric power of the main battery and the sub-battery is insufficient, the electric power can be supplied to the main battery and the sub-battery in time when the engine is started.

Further, in the power control method for a vehicle according to the embodiment of the present invention, the main battery is electrically connected to the sub-battery, and the power control method for a vehicle further includes step S107.

Step S107, when the first voltage value is smaller than a second preset voltage threshold and the engine is not started, if the state of charge value is larger than the second preset charge threshold, controlling the main battery to charge the auxiliary battery; the second preset voltage threshold is smaller than the first preset voltage threshold, and the second preset charge threshold is smaller than or equal to the first preset charge threshold.

In step S107, the second preset voltage threshold is the minimum voltage value at which the sub-battery can provide enough power for the load circuit to operate at the maximum power. If the first voltage value is smaller than the second preset voltage threshold, it indicates that the secondary battery cannot guarantee that enough electric quantity can be provided for the load circuit to work according to the maximum power, and therefore, electric energy needs to be supplemented for the secondary battery.

In step S107, the second preset charge threshold is a minimum state of charge value that ensures that the main battery can normally start the engine. If the current state of charge value of the main battery is smaller than the first preset charge threshold value, it is likely that the main battery cannot provide enough electric energy for the starter to start the engine. And if the current state of charge value of the main battery is larger than the first preset charge threshold value, the electric quantity of the main battery is sufficient, and the engine can be started normally. Therefore, when the first voltage value is smaller than a second preset voltage threshold and the engine is not started, the main battery can be controlled to charge the auxiliary battery as long as the state of charge value is larger than the second preset charge threshold.

It is understood that after the step S107, the following steps are also included: and if the first voltage value is greater than or equal to a second preset voltage threshold value, or the current state of charge value of the main battery is smaller than or equal to the first preset charge threshold value, or the engine is started, controlling the main battery to stop charging the auxiliary battery.

Furthermore, before controlling the main battery to charge the sub-battery, the current second voltage value of the main battery needs to be considered, and when the second voltage value of the main battery is greater than a fourth preset voltage threshold and the state of charge value is greater than a second preset charge threshold, the main battery is controlled to charge the sub-battery with the first voltage value smaller than the second preset voltage threshold. The fourth preset voltage threshold is a minimum voltage value which ensures that the main battery can normally start the vehicle. Through the steps, the main battery can be ensured to have enough voltage to start the vehicle after charging the auxiliary battery.

In practical application, the second preset voltage threshold, the fourth voltage threshold and the first preset charge threshold all need to be calibrated according to the actual situation of the whole vehicle, for example, the second preset voltage threshold may be set to 11.5V, the fourth preset voltage threshold may be set to 12.5V, and the first preset charge threshold may be set to 30%.

In practical applications, the specific operation of step S107 is: when the first voltage value is detected to be smaller than a second preset voltage threshold value, if the engine is not started at the moment, detecting whether the state of charge value of the main battery is larger than the second preset voltage threshold value or not and detecting whether the second voltage value of the main battery is larger than a fourth preset voltage threshold value or not, if the state of charge value of the main battery is larger than the second preset state of charge threshold value and the second voltage value is larger than the fourth preset voltage threshold value, controlling the main battery to charge the auxiliary battery for a preset time, and then detecting whether the first voltage value of the auxiliary battery reaches the second preset voltage threshold value or not; if the first voltage value reaches a second preset voltage threshold value, controlling the main battery to stop charging the auxiliary battery; if the state of charge value does not reach the first preset state of charge threshold value, continuing whether the state of charge value of the main battery is larger than a second preset state of charge threshold value or not and detecting whether a second voltage value of the main battery is larger than a fourth preset voltage threshold value or not; if the state of charge value of the main battery is not larger than a second preset charge threshold value or the second voltage value of the main battery is detected to be larger than a fourth preset voltage threshold value, controlling the main battery to stop charging the auxiliary battery; if the state of charge value of the main battery is greater than a second preset charge threshold value and the second voltage value of the main battery is greater than a fourth preset voltage threshold value, controlling the main battery to charge the auxiliary battery for a preset time and repeating subsequent operations; and if the engine is detected to be started, ending the process, namely, not controlling the main battery to charge the auxiliary battery any more. The predetermined time period needs to be set according to a lithium battery charging curve provided by a supplier, and may be 5min, for example.

Optionally, the power supply control method for the vehicle according to the embodiment of the present invention further includes step S108.

And S108, when the vehicle is in a braking state, controlling the generator to generate power according to a preset upper limit voltage value, wherein the preset upper limit voltage value is the maximum value in the power generation voltage range of the generator.

When the vehicle is in a braking state, it is described that the rotation speed of the wheel of the vehicle needs to be reduced, and the reduction of the rotation speed of the wheel can be realized by the acting force of the brake device of the vehicle on the brake pad of the vehicle opposite to the rotation direction of the wheel, and can also be realized by reducing the driving force of the wheel. In the step S108, since the engine is connected to the wheel through the transmission mechanism, and the generator is driven by the engine to generate power, when the generator generates power by using the preset upper limit voltage value, the resistance borne by the engine for driving the generator to generate power is maximized, so that the redundant mechanical energy in the engine can be converted into electric energy at the fastest speed, and the deceleration effect on the engine can be achieved as soon as possible, that is, the purpose of reducing the vehicle speed as soon as possible is achieved.

In practical application, the braking state can be determined by detecting a braking signal, and if the braking signal disappears or the vehicle speed becomes zero or a signal of stepping on the accelerator is detected again, it indicates that the braking process is finished, that is, the vehicle is no longer in the braking state.

Optionally, the power supply control method for the vehicle according to the embodiment of the present invention further includes steps S109 to S110.

Step S109, when the vehicle is in a braking state, if the first voltage value is smaller than a third preset voltage threshold value, controlling the generator to charge the secondary battery; wherein the third preset voltage threshold is greater than the first preset voltage threshold.

In step S109, the third preset voltage threshold is the maximum voltage value that can be reached by the sub-battery. If the first voltage value of the auxiliary battery is smaller than the third preset voltage value, the auxiliary battery can contain electric quantity. Therefore, when the vehicle is in a braking state, if the first voltage value is smaller than the third preset voltage threshold value, the generator can be controlled to charge the secondary battery, and the effect of recovering energy at the engine is achieved. And if the first voltage value of the secondary battery is greater than the third preset voltage threshold value, indicating that the electric quantity of the secondary battery is saturated, and controlling the generator to stop charging the secondary battery in order to protect the secondary battery.

In practical application, the third preset voltage threshold needs to be calibrated according to the actual condition of the whole vehicle, and may be set to 12.8V, for example.

Step S110, when the vehicle is in a braking state, if the state of charge value is smaller than a third preset state of charge threshold value, controlling the generator to charge the main battery; wherein the third preset charge threshold is greater than the second preset charge threshold.

In the step S110, the third preset soc threshold is an upper limit of the preset soc range of the main battery, and if the soc of the main battery is smaller than the third preset soc threshold, it indicates that the main battery can accommodate electric energy. Therefore, when the vehicle is in a braking state, if the current state of charge value of the main battery is smaller than a third preset state of charge threshold value, the generator can be controlled to charge the main battery, and therefore the effect of recovering energy at the engine is achieved. And if the current state of charge value of the main battery is larger than the third preset charge threshold value, indicating that the electric quantity of the main battery is saturated, and controlling the generator to stop charging the main battery in order to protect the main battery.

In practical application, the third preset charge threshold value needs to be calibrated according to the actual situation of the whole vehicle.

In practical applications, the specific operations of steps S109 and S110 are:

when a braking signal is detected, if the current first voltage value of the auxiliary battery is smaller than a third preset voltage threshold and the current preset state of charge value of the main battery is smaller than a third preset state of charge threshold, controlling the generator to generate power by using a preset upper limit voltage value, and controlling the generator to charge the auxiliary battery and the main battery at the same time; if the braking process is detected to be finished, controlling the generator to stop charging the auxiliary battery and the main battery;

when a braking signal is detected, if the current first voltage value of the auxiliary battery is not less than a third preset voltage threshold and the current preset state of charge value of the main battery is less than a third preset state of charge threshold, controlling the generator to generate power by using a preset upper limit voltage value, controlling the generator to charge the main battery, and controlling the generator not to charge the auxiliary battery; if the braking process is detected to be finished, controlling the generator to stop charging the main battery;

when the braking signal is detected, if the current first voltage value of the auxiliary battery is not less than the third preset voltage threshold and the current preset state of charge value of the main battery is not less than the third preset state of charge threshold, the generator is controlled to generate power normally, and the main battery and the auxiliary battery are not charged by the generator.

Optionally, in an embodiment of the present invention, the vehicle further includes an emergency help system, the main battery, the auxiliary battery, and the generator are all electrically connected to the emergency help system, and the provided power control method for the vehicle further includes step S111.

And S111, after the collision signal is detected, if the voltage output signal of the generator is not detected and the voltage output signal of the main battery is not detected, controlling the auxiliary battery to supply power for the emergency help-seeking system.

In step S111, since the main battery and the generator are both electrically connected to the emergency call-for-help system under normal conditions, that is, the emergency call-for-help system can be powered by the main battery and/or the generator to keep the emergency call function in a normal state, at least one of the voltage output signal of the generator and the voltage output signal of the main battery should be detected, so that the emergency call-for-help system can execute the corresponding emergency call-for-help function when triggered. And if the voltage output signal of the generator is not detected and the voltage output signal of the main battery is not detected, the current generator and the main battery cannot supply power for the emergency help-seeking system. If the situation occurs after the collision signal of the vehicle is detected, because the emergency call function is likely to need to be used at this time, and because the secondary battery is generally a battery with a simple circuit and a stable structure, such as a lithium battery, the power supply fault caused by the collision of the vehicle is avoided generally, so that the secondary battery can be controlled to supply power to the emergency call system, and the emergency call function can be ensured to be normally used.

In a specific embodiment, the vehicle is a vehicle with an intelligent start-stop function, when a start signal is detected, it is further determined whether the intelligent start-stop function of the vehicle is started, and if the intelligent start-stop function is started, steps S101 to S103 are executed; if the intelligent starting and stopping function is not started, the main battery is controlled to supply power to the starter so as to start the engine, the main battery is controlled to supply power to the load circuit, namely, the non-intelligent starting and stopping process is started, the use frequency of the secondary battery can be reduced under the condition that the intelligent starting and stopping function is not used, such as good road conditions, and the service life of the secondary battery is prolonged.

Referring to fig. 2, a flow chart of a power control method for a vehicle according to a preferred embodiment of the invention is shown, the power supply control method of the vehicle provided in the preferred embodiment of the invention is applied to the vehicle, the vehicle comprises a starter, an engine, a generator, a main battery and a load circuit, wherein the starter and the generator are mechanically connected with the engine, the starter is used for starting the engine, the generator is driven by the engine to generate electricity, the starter and the load circuit are both electrically connected with the main battery, the generator is electrically connected with the load circuit, wherein the vehicle further comprises an auxiliary battery, the auxiliary battery is electrically connected with the load circuit, the main battery and the auxiliary battery are both electrically connected with the generator, the main battery is also electrically connected with the auxiliary battery, and the power supply control method of the vehicle comprises steps S201 to S210:

step S201, when the vehicle is in a power-on state, acquiring a current first voltage value of the auxiliary battery and a current state of charge value of the main battery.

The above step S201 can refer to the detailed description of step S104, and is not repeated here.

And S202, controlling the main battery to supply power to the load circuit when the vehicle is in a power-on state and the engine is not started.

The above step S202 can refer to the detailed description of step S101, and is not repeated here.

And S203, when the vehicle is in a power-on state and a starting signal is detected, controlling the auxiliary battery to supply power to the load circuit, controlling the main battery to stop supplying power to the load circuit, and controlling the main battery to supply power to the starter so as to start the engine.

The above step S203 can refer to the detailed description of step S102, and is not repeated here.

And step S204, after the engine is started, controlling the engine to drive the generator to generate power, controlling the generator and the main battery to supply power to the load circuit, and controlling the auxiliary battery to stop supplying power to the load circuit.

The above step S204 can refer to the detailed description of step S103, which is not repeated herein.

And S205, when the first voltage value is smaller than a first preset voltage threshold value, if the engine is started, controlling the generator to charge the secondary battery.

The above step S205 can refer to the detailed description of step S105, and is not repeated here.

And S206, when the state of charge value is smaller than a first preset charge threshold value, if the engine is started, controlling the generator to charge the main battery.

The above step S206 can refer to the detailed description of step S106, and is not repeated here.

Step S207, when the first voltage value is smaller than a second preset voltage threshold and the engine is not started, if the state of charge value is larger than a second preset charge threshold, controlling the main battery to charge the auxiliary battery; the second preset voltage threshold is smaller than the first preset voltage threshold, and the second preset charge threshold is larger than the first preset charge threshold.

The above step S207 can refer to the detailed description of step S107, and is not repeated here.

And S208, when the vehicle is in a braking state, controlling the generator to generate power according to a preset upper limit voltage value, wherein the preset upper limit voltage value is the maximum value in the power generation voltage range of the generator.

The above step S208 can refer to the detailed description of step S108, and is not repeated here.

Step S209, when the vehicle is in a braking state, if the first voltage value is smaller than a third preset voltage threshold value, controlling the generator to charge the secondary battery; wherein the third preset voltage threshold is greater than the first preset voltage threshold.

The above step S209 can refer to the detailed description of step S109, and is not repeated here.

Step S210, when the vehicle is in a braking state, if the state of charge value is smaller than a third preset state of charge threshold value, controlling the generator to charge the main battery; wherein the third preset charge threshold is greater than the second preset charge threshold.

The step S210 can refer to the detailed description of the step S110, and is not repeated herein.

when the engine is not started, the main battery supplies power to the load circuit; when the engine is started through the starter, the auxiliary battery replaces the main battery to supply power for the load circuit, so that the voltage of the load circuit can be kept stable, the voltage input to the load circuit cannot be pulled down due to the running of the starter, the condition that the load circuit is restarted due to insufficient voltage is avoided, and the problem that the load circuit is restarted due to insufficient voltage when the engine of the existing vehicle is started is solved. In addition, when the vehicle is in a braking state, the generator can be controlled to generate power by using a preset upper limit voltage value, and when the current first voltage value of the auxiliary battery is smaller than a third preset voltage threshold value, the generator is controlled to charge the auxiliary battery; and when the current state of charge value of the main battery is smaller than a third preset charge threshold value, controlling the generator to charge the main battery, so that the speed reduction effect can be realized more quickly, and the energy at the engine can be recovered.

Another objective of the present invention is to provide a power control device for a vehicle, wherein referring to fig. 3, fig. 3 shows a schematic structural diagram of a power control device for a vehicle according to an embodiment of the present invention, the power control device for a vehicle is applied to a vehicle, the vehicle includes a starter, an engine, a generator 301, a main battery 302 and a load circuit 303, the starter and the generator 301 are mechanically connected to the engine, the starter is used for starting the engine, the generator 301 is driven by the engine to generate power, the starter and the load circuit 303 are electrically connected to the main battery 302, the generator 301 is electrically connected to the load circuit 303, the device includes a sub-battery 304 and a microcontroller 305, the sub-battery 304 is electrically connected to the load circuit 303, and the generator 301, the main battery, the load circuit and the load circuit 303 are electrically connected to each other, The primary battery 302 and the secondary battery 304 are both communicatively connected to the microcontroller 305, and the microcontroller (Micro Control Unit, MCU)305 is configured to:

when the vehicle is in a power-on state and the engine is not started, controlling the main battery 302 to supply power to the load circuit 303;

when the vehicle is in a power-on state and a starting signal is detected, controlling the auxiliary battery 304 to supply power to the load circuit 303, controlling the main battery 302 to stop supplying power to the load circuit 303, and controlling the main battery 302 to supply power to the starter so as to start the engine;

after the engine is started, the engine is controlled to drive the generator to generate power, the generator 301 and the main battery 302 are controlled to supply power to the load circuit 303, and the auxiliary battery 304 is controlled to stop supplying power to the load circuit 303.

In practical applications, the generator 301 is fixedly installed on a vehicle body ground of a vehicle.

In the system according to the embodiment of the present invention, when the vehicle is in a power-on state and the engine is not started, the microcontroller 305 controls the main battery 302 to supply power to the load circuit 303; when the vehicle is in a power-on state and a starting signal is detected, the auxiliary battery 304 is controlled to supply power to the load circuit 303, the main battery 302 is controlled to stop supplying power to the load circuit 303, and the main battery 302 is controlled to supply power to the starter so as to start the engine; after the engine is started, the generator 301 is driven by the engine to generate power, and the generator 301 and the main battery 302 are controlled to supply power to the load circuit 303, and the sub-battery 304 is controlled to stop supplying power to the load circuit 303. Because the load circuit 303 is powered by the main battery 302 when the engine is not started; when the engine is started through the starter, the auxiliary battery 304 replaces the main battery 302 to supply power to the load circuit 303, so that the voltage of the load circuit 303 can be kept stable, the voltage input to the load circuit 303 cannot be reduced due to the running of the starter, the restarting of the load circuit 303 due to insufficient voltage is avoided, and the problem that the restarting of the load circuit 303 due to insufficient voltage is easily caused when the engine of the existing vehicle is started is solved. In addition, the scheme has a simple structure, and a large number of electronic components are not required.

Optionally, in a specific implementation manner of the embodiment of the present invention, the apparatus further includes a first switch K1 and a second switch K2, the first switch K1 is disposed between the main battery 302 and the load circuit 303, the generator 301 is electrically connected to the load circuit 303 via the first switch K1, and the second switch K2 is disposed between a connection line between the first switch K1 and the load circuit 303 and the sub-battery 304; the first switch K1 and the second switch K2 are both connected to the microcontroller 305 in communication;

the microcontroller 305 is specifically configured to: when the vehicle is in a power-on state and the engine is not started, controlling the first switch K1 to be closed and controlling the second switch K2 to be opened so as to control the main battery 302 to supply power to the load circuit 303; when the vehicle is in a power-on state and a starting signal is detected, controlling the first switch K1 to be opened, and controlling the second switch K2 to be closed so as to control the main battery 302 to stop supplying power to the load circuit 303, and control the main battery 302 to supply power to the starter so as to start the engine; after the engine is started, the engine drives the generator 301 to generate power, the first switch K1 is controlled to be closed, the second switch K2 is controlled to be opened, the generator 301 and the main battery 302 are controlled to supply power to the load circuit 303, and the auxiliary battery 304 is controlled to stop supplying power to the load circuit 303.

In the above embodiment, when the engine is not started, by controlling the first switch K1 to be closed and the second switch K2 to be opened, it is possible to supply power to the load circuit 303 from the main battery 302; when the starter starts the engine, the first switch K1 is controlled to be opened and the second switch K2 is controlled to be closed, so that the auxiliary battery 304 can supply power for the load circuit 303 instead of the main battery 302, the voltage of the load circuit 303 can be maintained stable, the voltage input to the load circuit 303 cannot be reduced due to the running of the starter, and the condition that the load circuit 303 is restarted due to insufficient voltage is avoided.

Optionally, in a specific implementation manner of the embodiment of the present invention, the main battery 302 is electrically connected to the generator 301, the auxiliary battery 304 is electrically connected to the generator 301 through the first switch K1 and the second switch K2, and the microcontroller 305 is further configured to:

when the vehicle is in a power-on state, acquiring a current first voltage value of the auxiliary battery 304 and a current state of charge of the main battery 302;

when the first voltage value is smaller than a first preset voltage threshold value, if the engine is started, controlling the first switch K1 and the second switch K2 to be closed so as to control the generator 301 to charge the secondary battery 304;

when the state of charge value is smaller than a first preset charge threshold value, if the engine is started, the first switch is controlled to be closed, and the generator 301 is controlled to charge the main battery 302.

In the above embodiment, when the first voltage value is smaller than the first preset voltage threshold and the engine is started, the first switch K1 is controlled to be closed and the second switch K2 is controlled to be closed, so that the secondary battery 304 and the generator 301 can be electrically connected, and further, the generator can charge the secondary battery 304; when the state of charge value is smaller than a first preset charge threshold value and the engine is started, controlling a first switch K1 to be closed so as to supply power to a load circuit 303 and controlling the generator 301 to charge the main battery 302.

Optionally, in a specific implementation manner of the embodiment of the present invention, the main battery 302 is electrically connected to the sub-battery 304 through the first switch K1 and the second switch K2, and the microcontroller 305 is further configured to:

when the first voltage value is smaller than a second preset voltage threshold and the engine is not started, if the state of charge value is larger than a second preset charge threshold, controlling the first switch K1 and the second switch K2 to be closed so as to control the main battery 302 to charge the auxiliary battery 304; the second preset voltage threshold is smaller than the first preset voltage threshold, and the second preset charge threshold is larger than the first preset charge threshold.

In the above embodiment, the main battery 302 and the sub-battery 304 can be electrically connected by controlling the first switch K1 and the second switch K2 to be closed, and the main battery 302 can charge the sub-battery 304.

Optionally, in a specific implementation manner of the embodiment of the present invention, the microcontroller 305 is further configured to:

when the vehicle is in a braking state, the generator 301 is controlled to generate power by using a preset upper limit voltage value, wherein the preset upper limit voltage value is the maximum value in the power generation voltage range of the generator 301.

when the vehicle is in a braking state, if the first voltage value is smaller than a third preset voltage threshold, controlling the first switch K1 and the second switch K2 to be closed so that the generator 301 charges the secondary battery 304; wherein the third preset voltage threshold is greater than the first preset voltage threshold;

when the vehicle is in a braking state, if the state of charge value is smaller than a third preset state of charge threshold value, controlling the first switch K1 to be closed, and controlling the generator 301 to charge the main battery 302; wherein the third preset charge threshold is greater than the second preset charge threshold.

In the above embodiment, when the vehicle is in a braking state, if the first voltage value is smaller than the third preset voltage threshold, the first switch K1 and the second switch K2 are controlled to be closed, so that the generator 301 charges the secondary battery 304, the energy of the engine is recovered by the secondary battery, and the power can be supplied to the load circuit 303 through the generator 301. When the vehicle is in a braking state, if the state of charge value is smaller than a third preset state of charge threshold value, the generator 301 is controlled to charge the main battery 302, the energy of the engine can be recovered by using the main battery, and meanwhile, the generator 301 can supply power to the load circuit 303.

Optionally, in a specific implementation manner of the embodiment of the present invention, the vehicle further includes an emergency help system 308, the generator 301 and the main battery 302 are both electrically connected to the emergency help system 308, the apparatus further includes a third switch K3, the third switch K3 is disposed between the emergency help system 308 and the auxiliary battery 304, the auxiliary battery 304 is electrically connected to the emergency help system 308 through the third switch K3, and the microcontroller 305 is further configured to:

after the collision signal is detected, if the voltage output signal of the generator 301 is not detected and the voltage output signal of the main battery 302 is not detected, the third switch K3 is controlled to be closed, so as to control the auxiliary battery to supply power for the emergency help system.

In the above embodiment, the third switch K3 is turned off before the collision signal is detected, that is, the third switch K3 is turned off when the vehicle is not in collision, and the main battery 302 and the generator 301 supply power to the distress system 308. After the collision signal is detected, if the voltage output signal of the generator 301 is not detected and the voltage output signal of the main battery 302 is not detected, it indicates that neither the main battery 302 nor the generator 301 can supply power to the emergency call-for-help system 308, so that the third switch K3 is controlled to be closed, the auxiliary battery 304 and the emergency call-for-help system 308 are conducted, and the auxiliary battery 304 can be used for supplying power to the emergency call-for-help system 308.

In practical applications, the apparatus further includes a battery sensor 306 disposed at the main battery 302 for obtaining a state signal of the main battery, where the state signal includes a voltage, a state of charge value, and the like. The battery sensor 306 is communicatively connected to the microcontroller 305 to transmit a status signal of the main battery to the microcontroller 305.

In practical applications, the apparatus further includes an engine controller 307, and the generator 301 and the microcontroller 305 are communicatively connected to the engine controller 307. The microcontroller 305 may thus acquire a start-stop signal of the vehicle via the engine controller 307 and control the operating state of the generator 301 via the engine controller 307.

In practical applications, the microcontroller 305 is electrically connected to the generator 301 and the main battery 302 through a low dropout regulator (LDO), so that the generator 301 and the main battery 302 can supply power to the microcontroller 305; meanwhile, the microcontroller 305 is electrically connected to the secondary battery 304 through another LDO, so that the secondary battery 304 can supply power to the microcontroller 305 when neither the generator 301 nor the main battery 302 can supply power to the microcontroller.

In practical applications, the generator 301 and the main battery 302 are connected to the first switch K1 through the same first diode 309, and the generator 301 and the main battery 302 are electrically connected to the emergency help system through the same second diode 310, so as to achieve a unidirectional conduction effect, thereby protecting the microcontroller 305 from being damaged by reverse current. In addition, the connection line between the first diode 309 and the generator 301 and the main battery 302 is also connected to the microcontroller 305 through a detection circuit, so that voltage output signals of the generator 301 and the main battery 302 can be detected by the microcontroller 305.

In practical applications, the generator 301 is an intelligent generator, which is controlled by an Engine Controller (ECU) 307 and can generate different power generation amounts under different working conditions; the main battery 302 may be a storage battery; the secondary battery 304 may be a lithium battery, such as a 12V lithium ion battery; and the vehicle can be a vehicle with an intelligent start-stop function.

Referring to fig. 4, a schematic diagram of a work flow in a vehicle starting process provided by the embodiment of the invention in practical application is shown, including steps S401 to S412. Where U2 represents a first preset voltage threshold.

In step S404, if the microcontroller receives that the start signal is not the intelligent start-stop signal, the process proceeds to step S406, and controls the switch K1 to be closed, and the switches K2 and K3 to be open; if the starting signal received by the microcontroller is an intelligent starting and stopping signal, the step S405 is entered, and the control switch K2 is controlled to be closed, and the switches K1 and K3 are opened;

in step S407, after the vehicle is started, step S408 is executed to cyclically detect the voltage value of the input end of the first diode; when the voltage value of the input end reaches U2, the step S409 is carried out, the switch K1 is controlled to be closed, the switches K2 and K3 are switched off, the step S410 is carried out, whether the voltage value of the lithium battery reaches U2 is detected, and if the voltage value of the lithium battery does not reach U2, the step S411 is carried out; in step S411, the switches K1 and K2 are controlled to be closed, the switch K3 is controlled to be opened, the lithium battery is charged by the intelligent generator, the intelligent generator charges the lithium battery for 5min each time, then the switches K2 and K3 are opened and K1 is closed, and whether the lithium battery reaches U2 is continuously detected; if the voltage of the lithium battery is less than U2, the switches K1 and K2 are controlled to be closed, the K3 is controlled to be disconnected, and the intelligent generator is controlled to continue to charge the lithium battery; if the voltage of the lithium battery reaches U2, the control switch K1 is closed, the control switches K2 and K3 are disconnected, and the intelligent generator is controlled to stop charging the lithium battery.

Referring to fig. 5, a schematic diagram of a work flow of the vehicle in an un-started state in practical application is shown, including steps S501 to S510. Where U4 represents the second preset voltage threshold, U1 represents the fourth preset voltage threshold, and N represents the first preset charge threshold.

In step S501, if it is detected that the vehicle is in a sleep state, the process goes to step S502, the switch K1 is controlled to be closed, the switches K2 and K3 are controlled, at this time, the microcontroller cannot detect an ON/ACC shift signal, and the lithium battery is in an open circuit state in the vehicle power supply network; if in step S501, if it is detected that the vehicle is not in the sleep state, the process proceeds to step S504, the switch K1 is controlled to be closed, the switches K2 and K3 are controlled to be opened, then the process proceeds to step S505, it is detected that the current lithium battery voltage reaches U4, if the current lithium battery voltage does not reach U4, it is determined that the lithium battery needs to be charged, and the process proceeds to step S506; in step S506, detecting a voltage value and an SOC value of the battery, if the voltage value of the battery is greater than a threshold U1 and the SOC of the battery is greater than N, determining that the battery needs to charge the lithium battery, controlling switches K1 and K2 to be closed, controlling K3 to be open, charging the lithium battery for 5min, detecting whether the voltage value of the lithium battery reaches U4, and if the voltage value of the lithium battery does not reach U4, returning to the previous cycle; if the voltage value of the storage battery is less than or equal to U1, or the SOC of the storage battery is less than or equal to N, or whether the voltage value of the lithium battery reaches U4, the step S510 is entered, and the storage battery is controlled not to charge the lithium battery;

in addition, when the whole vehicle is powered OFF or the OFF gear is dormant in the process of charging the lithium battery through the storage battery, the control K2 is disconnected, namely the charging is finished.

Referring to fig. 6, a schematic diagram of a work flow when the vehicle is not started in an actual application is shown, which includes steps S601 to S611. Where U3 represents a third preset voltage threshold.

If the braking signal is not detected in step S602, step S604 is performed and the intelligent generator is controlled to generate power normally; if the braking signal is detected in the step S602, the step S603 is carried out, the intelligent engine is controlled to generate power at the maximum power generation voltage, then the step S605 is carried out, the switches K1 and K2 are controlled to be closed, the K3 is controlled to be opened, the intelligent generator generates 16V power generation voltage in the braking process, and the intelligent generator charges the storage battery and the lithium battery at the same time; then in step S607, if the vehicle speed is detected to be zero or the accelerator signal is detected, it indicates that the braking process is finished, so step S608 is entered, the switch K1 is controlled to be closed, the switches K2 and K3 are disconnected, step S609 is entered, and it is detected whether the voltage of the lithium battery reaches the set value U3, and if the voltage of the lithium battery reaches the set value U3, the lithium battery is not charged any more in the next braking process, and only the storage battery is charged; if the voltage of the lithium battery detected in the step S609 does not reach the preset value U3, the next braking energy recovery process continues to charge the lithium battery and the storage battery at the same time.

The vehicle and the power supply control method and device of the vehicle have the same advantages compared with the prior art, and are not repeated herein

The technical details and advantages relating to the above-described device and vehicle have been set forth in detail in the above-described method and will not be described again here.

In summary, according to the power control method, the power control device and the vehicle provided by the application, when the vehicle is in a power-on state and the engine is not started, the main battery is controlled to supply power to the load circuit; when the vehicle is in a power-on state and a starting signal is detected, the auxiliary battery is controlled to supply power to the load circuit, the main battery is controlled to stop supplying power to the load circuit, and the main battery is controlled to supply power to the starter so as to start the engine; after the engine is started, the generator is driven by the engine to generate power, the generator and the main battery are controlled to supply power to the load circuit, and the auxiliary battery is controlled to stop supplying power to the load circuit. Because the load circuit is powered by the main battery when the engine is not started; when the engine is started through the starter, the auxiliary battery replaces the main battery to supply power for the load circuit, so that the voltage stability of the load circuit can be maintained, the voltage input to the load circuit cannot be reduced due to the running of the starter, the voltage stabilizing effect on the load circuit is equivalently realized, the condition that the load circuit is restarted due to insufficient voltage is avoided, and the problem that the load circuit is restarted due to insufficient voltage easily occurs when the engine of the existing vehicle is started is solved. In addition, the scheme has a simple structure, and a large number of electronic components are not required.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A power control method of a vehicle is applied to the vehicle, the vehicle comprises a starter, an engine, a generator, a main battery and a load circuit, the starter and the generator are mechanically connected with the engine, the starter and the load circuit are electrically connected with the main battery, the generator is electrically connected with the load circuit, the vehicle further comprises a secondary battery, and the secondary battery is electrically connected with the load circuit, the method comprises the following steps:

2. The power supply control method according to claim 1, wherein the main battery and the sub-battery are each electrically connected to the generator, the method further comprising:

3. The power supply control method according to claim 2, wherein the main battery is electrically connected to a sub-battery;

4. The power control method of claim 2, further comprising:

5. The power control method of claim 2, further comprising:

6. The power supply control method according to claim 1, wherein the vehicle further includes an emergency call-for-help system, the main battery, the sub-battery, and the generator are all electrically connected to the emergency call-for-help system, the method further comprising:

7. A power supply control device of a vehicle is applied to the vehicle, the vehicle comprises a starter, an engine, a generator, a main battery and a load circuit, the starter and the generator are mechanically connected with the engine, the starter and the load circuit are electrically connected with the main battery, the generator is electrically connected with the load circuit, the power supply control device is characterized by comprising a secondary battery and a microcontroller, the secondary battery is electrically connected with the load circuit, the generator, the main battery and the secondary battery are in communication connection with the microcontroller, and the microcontroller is used for:

8. The apparatus according to claim 7, further comprising a first switch provided between the main battery and the load circuit, the generator being electrically connected to the load circuit via the first switch, and a second switch provided between a connection line of the first switch and the load circuit and the sub-battery;

the microcontroller is specifically configured to:

9. The apparatus of claim 8, wherein the primary battery is electrically connected to the generator, the secondary battery is electrically connected to the generator through the first switch and the second switch, and the microcontroller is further configured to:

10. The apparatus of claim 8, wherein the primary battery is electrically connected to the secondary battery through the first switch and the second switch, the microcontroller further configured to:

11. The apparatus of claim 8, wherein the microcontroller is further configured to:

12. The apparatus of claim 8, wherein the microcontroller is further configured to:

13. The apparatus of claim 7, wherein the vehicle further comprises an emergency call-for-help system, the generator and the primary battery are both electrically connected to the emergency call-for-help system, the apparatus further comprises a third switch, the secondary battery is electrically connected to the emergency call-for-help system through the third switch, the microcontroller is further configured to:

14. A vehicle characterized by comprising the vehicle power supply control apparatus according to any one of claims 7 to 13.