CN114802182A - Energy management method and system for 48V hybrid vehicle and vehicle - Google Patents

Abstract

The invention provides an energy management method, system and vehicle for a 48V hybrid vehicle. The energy management method for a 48V hybrid vehicle includes the following steps: starting the vehicle; acquiring vehicle driving information; The difference between the output power and the power required for the vehicle to run; set the 48V motor working mode and the switching node in this mode; when the vehicle reaches the switching node, switch the 48V motor to the working mode. According to the energy management method of the 48V hybrid vehicle according to the embodiment of the present invention, by acquiring the vehicle driving information, setting the working mode of the 48V motor and the switching node in the mode, the energy management method of the 48V hybrid vehicle can improve the 48V motor hybrid power system. Responsiveness, effectively reduce the delay of energy recovery and boosting, improve work efficiency, and have good energy saving and emission reduction effects.

Description

A 48V hybrid vehicle energy management method, system and vehicle

technical field

The invention relates to the technical field of vehicles, in particular to an energy management method, system and vehicle for a 48V hybrid vehicle.

Background technique

In recent years, due to the pressure of energy supply and ecological environment, countries have gradually introduced more stringent regulations on vehicle emissions and energy consumption, which has also put OEMs under pressure to upgrade and transform their technologies. In this context, new energy vehicles have become the main means for OEMs to reduce fuel consumption and emissions. But for the vast majority of OEMs (Original Equipment Manufacturers), from deep hybrids to pure electric and fuel cell vehicles, they are in a state of loss due to high costs. 48V mild-hybrid systems are gradually gaining the favor of many OEMs because of their lower hardware costs and the ability to implement most hybrid functions.

From a cost point of view, the 48V power system does not require additional high-voltage safety protection because it is below the safety voltage level of 60V; in addition, the power and energy levels of the electrified components in the 48V power system are low, and its hardware cost is lower than that of deep The mixing system is greatly reduced. These two reasons make the 48V powertrain a very cost-effective hybrid solution. From the perspective of vehicle hybrid function and performance, the 48V power system can realize most of the hybrid functions such as engine start-stop, braking energy recovery, driving power generation, motor assist, and pure electric drive (depending on the configuration).

Therefore, the 48V power system technology is mainly developed for the function of energy saving and emission reduction. In actual use, the energy management of the 48V power system mainly adopts the method of recovering the mechanical energy of the engine and assisting the driving of the vehicle by means of motor assistance. The energy recovery mode is in the following two ways It is activated in one case, one is braking, at this time is braking energy recovery; the other is coasting, at this time is coasting energy recovery. In the energy recovery mode, the motor enters the torque control mode, and the corresponding torque control is performed with the brake pedal and the vehicle speed as the input, and the kinetic energy wasted in the non-hybrid vehicle is recovered and converted into electric energy stored in the battery for the consumption of the vehicle's electrical appliances or It is used in power-assisted mode, but due to the large delay of the energy management strategy triggered by braking and vehicle speed, the kinetic energy within the delay time cannot be effectively recovered, especially when the vehicle needs to go up and down frequently and wait for traffic lights. Seriously, the energy saving and emission reduction function of the 48V power system cannot be fully utilized.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiment of the present invention The kinetic energy of the energy management system of the 48V power system cannot be effectively recovered within the delay time, especially when the vehicle is in a situation where the vehicle needs to go up and down frequently and wait for traffic lights, the energy is seriously wasted, and the 48V power cannot be fully utilized. Energy saving and emission reduction function of the system.

In view of this, the present invention provides an energy management method for a 48V hybrid vehicle.

The invention also provides an energy management system for a 48V hybrid vehicle.

The present invention further provides a vehicle with a 48V hybrid vehicle energy management system.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

The energy management method for a 48V hybrid vehicle according to the embodiment of the first aspect of the present invention includes the following steps:

start the vehicle;

Obtain vehicle driving information;

Predict the working state of the engine when the vehicle is running, and calculate the difference between the output power of the engine and the power required for the vehicle to run;

Set the 48V motor working mode and the switching node in this mode;

When the vehicle reaches the switching node, the 48V motor is switched to the operating mode.

The energy management method for a 48V hybrid vehicle according to the embodiment of the present invention may further include the following technical features:

Further, the starting the vehicle includes:

Turn on the vehicle power, start the vehicle control system, GPS positioning system and navigation system;

The 48V motor drives the engine to a set speed for fuel injection and ignition, completes the engine start, and the vehicle starts to drive.

Further, the set rotational speed is 800rpm.

Further, acquiring vehicle driving information includes:

The on-board control system feeds back the speed of the vehicle;

The GPS positioning system obtains the altitude of the vehicle;

The navigation system obtains the vehicle driving route;

The GPS positioning system predicts the road segment type of the vehicle's driving route according to the vehicle's driving route;

The GPS positioning system predicts the distance between the vehicle and the traffic light according to the driving route of the vehicle, and predicts the waiting time of the vehicle at the traffic light according to the speed of the vehicle fed back by the on-board control system.

Further, the working modes include an assist mode and an energy recovery mode.

Further, the road segment types include an uphill road segment, a gentle road segment and a downhill road segment;

When the vehicle is on an uphill section, the 48V motor starts the boost mode;

When the vehicle is on a gentle road section, the 48V motor will start the boost mode or the energy recovery mode respectively according to whether the vehicle is in the acceleration state or the coasting state;

When the vehicle is on a downhill road, the 48V motor activates the energy recovery mode.

Further, the vehicle is controlled to turn off or enter an idle state according to the waiting time of the vehicle at the traffic light.

Further, the vehicle-mounted control system includes a vehicle front and rear distance detector, and the vehicle front and rear distance detector is used to detect the front and rear vehicle distance.

Further, the navigation system detects surrounding vehicles, predicts the number of vehicles waiting for the traffic lights, and calculates the waiting time for the traffic lights.

Further, the working state of the engine is judged according to the running speed of the vehicle, the distance between the vehicle and the switching node, and the distance between the vehicle and the traffic lights.

Further, the difference between the output power of the engine and the power required for the vehicle to travel is determined according to the driver's control of the brake pedal and the conversion of road segment types.

Further, the 48V motor is equipped with two energy storage mechanisms, a 12V battery and a 48V super capacitor. When the 48V motor is working normally, the 12V battery is used as an energy storage mechanism. When the 48V motor needs to frequently switch the working mode, the The 48V supercapacitor is used as an energy storage mechanism.

According to the second aspect of the present invention, an energy management system for a 48V hybrid vehicle includes:

a starting module, the starting module starts the vehicle;

an information acquisition module, the information acquisition module acquires vehicle driving information;

a first processing module, the first processing module predicts the working state of the engine when the vehicle is running, and calculates the difference between the output power of the engine and the power required for the vehicle to run;

The second processing module, the second processing module sets the switching node and the 48V motor working mode;

An execution module, when the vehicle reaches the switching node, the execution module switches the 48V motor to the working mode.

Further, the information acquisition module includes a vehicle-mounted control system, a GPS positioning system and a navigation system.

A vehicle according to an embodiment of the third aspect of the present invention includes the energy management system of the 48V hybrid vehicle described in the above embodiment.

The above-mentioned technical solutions of the present invention have at least the following technical effects:

According to the energy management method of a 48V hybrid vehicle according to the embodiment of the present invention, by acquiring the vehicle driving information, setting the 48V motor working mode and the switching node in this mode, the energy management method of the 48V hybrid vehicle can improve the 48V motor hybrid power system. Responsiveness, effectively reduce the delay of energy recovery and boosting, improve work efficiency, and have good energy saving and emission reduction effects.

Description of drawings

1 is a flowchart of an energy management method for a 48V hybrid vehicle according to an embodiment of the present invention;

FIG. 2 is a working principle diagram of an energy management method for a 48V hybrid vehicle according to an embodiment of the present invention;

3 is a schematic structural diagram of an energy management system for a 48V hybrid vehicle according to an embodiment of the present invention.

reference number

48V hybrid vehicle energy management system 100; startup module 10; information acquisition module 20; vehicle control system 21; GPS positioning system 22; navigation system 23; first processing module 30; second processing module 40; execution module 50; 48V Motor 60; accelerator pedal 70; brake pedal 80.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

The energy management method for a 48V hybrid vehicle according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

The energy management method for a 48V hybrid vehicle according to an embodiment of the present invention includes the following steps: starting the vehicle; acquiring vehicle driving information; ; Set the 48V motor 60 working mode and the switching node in this mode; when the vehicle reaches the switching node, switch the 48V motor 60 to the working mode.

That is to say, as shown in FIG. 1 , after the vehicle is started, the driving information of the vehicle is obtained through manual input or the vehicle's own electronic system (such as the navigation system 23 , etc.), and the driving route of the vehicle is predicted, thereby setting the 48V motor 60 in advance. When the vehicle travels to the corresponding road condition, the 48V motor 60 responds in time, switches the working mode, reduces time delay, and improves work efficiency and energy utilization efficiency.

Therefore, according to the energy management method of the 48V hybrid vehicle according to the embodiment of the present invention, by obtaining the vehicle driving information, setting the working mode of the 48V motor 60 and the switching node in this mode, the energy management method of the 48V hybrid vehicle can increase the 48V The responsiveness of the motor 60 hybrid system can effectively reduce the delay of energy recovery and boosting, improve work efficiency, and achieve good energy saving and emission reduction effects.

According to an embodiment of the present invention, starting the vehicle includes: turning on the power of the vehicle, starting the vehicle control system 21, the GPS positioning system 22 and the navigation system 23; the 48V motor 60 drives the engine to a set speed for fuel injection and ignition, and completes the engine start. The vehicle starts to move.

Preferably, the set rotational speed is 800rpm.

That is to say, the engine is driven by the 48V motor 60 to avoid the low-speed engine economical area, directly drag it to 800rpm, then inject and ignite the engine, complete the engine start, and the vehicle starts to drive.

Preferably, as shown in FIG. 2 , acquiring the vehicle driving information includes: the vehicle-mounted control system 21 feeds back the driving speed of the vehicle; the GPS positioning system 22 locates the vehicle position through GPS positioning satellites, and acquires the altitude of the vehicle; the navigation system 23 acquires the driving route of the vehicle; The GPS positioning system 22 predicts the road segment type of the vehicle’s driving route according to the vehicle’s driving route; the GPS positioning system 22 predicts the distance between the vehicle and the traffic lights according to the vehicle’s driving route, and predicts the waiting of the vehicle at the traffic light according to the vehicle’s driving speed fed back by the on-board control system 21 time.

It should be noted that the way in which the navigation system 23 obtains the driving route of the vehicle includes calculation based on the destination manually input by the driver and prediction based on GPS positioning and the driving direction of the vehicle, so that the navigation system 23 can obtain the driving route when the driver does not input the route. , the navigation system 23 can also predict the driving route of the vehicle, so as to ensure the normal operation of the energy management of the 48V motor 60 .

According to an embodiment of the present invention, the working modes include an assist mode and an energy recovery mode.

Specifically, in the boost mode, the 48V motor 60 works as an electric motor and enters the torque control mode, which can make the engine enter the high-efficiency area by sharing a part of the load of the engine, thereby saving fuel. In the energy recovery mode, the motor enters the torque control mode, and the energy recovery mode is activated in advance according to the predicted result of the vehicle, and then the corresponding torque control is performed in combination with the driver's control of the brake pedal 80 and the accelerator pedal 70, and the negative torque provided by the 48V motor 60 is used. The excess kinetic energy of the engine is recovered, and the kinetic energy wasted in the driving of the vehicle is directly recovered, which ensures the timeliness of the start of the 48V motor 60 and avoids the impact of the driver's misoperation on the energy recovery.

Optionally, the road segment type includes an uphill road segment, a gentle road segment, and a downhill road segment. When the vehicle is on an uphill section, the 48V motor 60 starts the power assist mode; when the vehicle is on a gentle road section, the 48V motor 60 starts the power assist mode or energy recovery mode respectively according to whether the vehicle is in an accelerating state or a coasting state; when the vehicle is on a downhill road section, The 48V motor 60 starts the energy recovery mode.

In an embodiment of the present invention, the vehicle is controlled to turn off or enter an idle state according to the waiting time of the vehicle at the traffic light.

Specifically, the navigation system 23 can determine the waiting time of the vehicle at the traffic light according to the speed of the vehicle, the distance from the vehicle to the traffic light, and the current time of the traffic light, and then choose to turn off the vehicle or enter the idle state. For example, when the vehicle needs to wait at a traffic light for more than twenty seconds, the vehicle needs to be turned off to reduce unnecessary energy consumption when the vehicle is idling and improve energy utilization.

Preferably, the vehicle-mounted control system 21 includes a vehicle front and rear distance detector, and the vehicle front and rear distance detector is used to detect the front and rear vehicle distance. The accuracy of the prediction results is further improved.

According to an embodiment of the present invention, the navigation system 23 detects surrounding vehicles, predicts the number of vehicles waiting for the traffic lights, and calculates the time for waiting for the traffic lights. By assisting in judging the vehicles on the road, the time of waiting for the traffic light of the vehicle is judged, and the accuracy of the prediction result of the waiting time of the vehicle for the traffic light is improved.

In one embodiment of the present invention, the working state of the engine is determined according to the speed of the vehicle, the distance between the vehicle and the switching node, and the distance between the vehicle and the traffic lights.

That is to say, the working state of the vehicle engine is comprehensively judged according to the current speed of the vehicle, the distance between the vehicle and the expected road segment type switching node, and the distance between the vehicle and the traffic lights, and the prediction of the working state of the vehicle engine is dynamically transformed according to the driver's operation. The working state of the engine is judged according to the prediction result, so as to facilitate the pre-arrangement of the work of the 48V motor 60 and reduce the delay time when the 48V motor 60 is switched.

According to an embodiment of the present invention, the difference between the output power of the engine and the power required for the vehicle to run is determined according to the driver's control of the brake pedal 80 and the change of the road segment type.

In other words, the output power of the engine varies according to the control of the accelerator pedal 70, and the power required for the vehicle to travel varies according to the type of the vehicle's driving route, and the difference is dynamically transformed.

According to an embodiment of the present invention, the 48V motor 60 is equipped with two energy storage mechanisms, a 12V battery and a 48V super capacitor. When the 48V motor 60 is working normally, the 12V battery is used as the energy storage mechanism. When the 48V motor 60 needs to switch the working mode frequently , 48V supercapacitor as an energy storage mechanism.

That is to say, frequent charging and discharging will cause the battery to heat up, reducing the service life of the battery and causing potential safety hazards, while the 48V supercapacitor is responsible for the charging and discharging tasks under harsh conditions such as low temperature, high voltage, and overload, so that the battery can work relatively smoothly. Under the conditions, the stability and reliability of the vehicle's 48V power system can be improved.

All in all, according to the energy management method of the 48V hybrid vehicle according to the embodiment of the present invention, by acquiring the vehicle driving information, setting the working mode of the 48V motor 60 and the switching node in this mode, the energy management method of the 48V hybrid vehicle can improve the performance of the 48V motor. The responsiveness of the 60 hybrid system effectively reduces the delay of energy recovery and boosting, improves work efficiency, and has good energy saving and emission reduction effects.

The energy management system 100 of the 48V hybrid vehicle according to the embodiment of the second aspect of the present invention includes a startup module 10 , an information acquisition module 20 , a first processing module 30 , a second processing module 40 and an execution module 50 .

Specifically, the starting module 10 starts the vehicle, the information obtaining module 20 obtains vehicle driving information, the first processing module 30 predicts the working state of the engine when the vehicle is running, and calculates the difference between the output power of the engine and the power required for the vehicle to run, and the second processing module 30 The processing module 40 sets the switching node and the working mode of the 48V motor 60. When the vehicle reaches the switching node, the execution module 50 switches the 48V motor 60 to the working mode.

That is to say, as shown in FIG. 2 and FIG. 3 , the energy management system 100 of the 48V hybrid vehicle predicts the driving process of the vehicle, so that the energy recovery mode and the booster mode are activated in advance according to the prediction result, so that the 48V motor 60 is mixed The management strategy of the power system is more responsive, effectively reducing the delay in starting the energy recovery mode and boost mode, improving energy utilization, and achieving better energy conservation and emission reduction effects.

Further, the information acquisition module 20 includes a vehicle-mounted control system 21 , a GPS positioning system 22 and a navigation system 23 .

Specifically, the in-vehicle control system 21 feeds back the speed of the vehicle; the GPS positioning system 22 locates the vehicle position through GPS positioning satellites, and obtains the altitude of the vehicle; the navigation system 23 obtains the driving route of the vehicle; the GPS positioning system 22 predicts the driving route of the vehicle according to the driving route of the vehicle The GPS positioning system 22 predicts the distance between the vehicle and the traffic light according to the driving route of the vehicle, and predicts the waiting time of the vehicle at the traffic light according to the speed of the vehicle fed back by the on-board control system 21 . The vehicle control system 21 , the GPS positioning system 22 and the navigation system 23 work together to obtain accurate information, which can further reduce the delay of energy recovery or assisting, and improve work efficiency.

The vehicle according to the embodiment of the third aspect of the present invention includes the energy management system 100 of the 48V hybrid vehicle according to the above-mentioned embodiment. Since the energy management system 100 of the 48V hybrid vehicle according to the above-mentioned embodiment of the present invention has the above technical effect, therefore, The vehicle according to the embodiment of the present invention also has corresponding technical effects, that is, the delay of energy recovery and assist is effectively reduced, the work efficiency is improved, and the effect of energy saving and emission reduction is good.

Other structures and operations of the vehicle according to the embodiment of the present invention can be understood and easily realized by those skilled in the art, and thus will not be described in detail.

Unless otherwise defined, technical or scientific terms used in the present invention should have the ordinary meaning as understood by those of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and similar terms used herein do not denote any order, quantity, or importance, but are merely used to distinguish different components. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (15)

1. an energy management method of a 48V hybrid vehicle, is characterized in that, comprises the following steps: start the vehicle; Obtain vehicle driving information; Predict the working state of the engine when the vehicle is running, and calculate the difference between the output power of the engine and the power required for the vehicle to run; Set the 48V motor working mode and the switching node in this mode; When the vehicle reaches the switching node, the 48V motor is switched to the operating mode. 2. The energy management method for a 48V hybrid vehicle according to claim 1, wherein the starting the vehicle comprises: Turn on the vehicle power, start the vehicle control system, GPS positioning system and navigation system; The 48V motor drives the engine to a set speed for fuel injection and ignition, completes the engine start, and the vehicle starts to drive. 3 . The energy management method for a 48V hybrid vehicle according to claim 2 , wherein the set rotational speed is 800 rpm. 4 . 4. The energy management method for a 48V hybrid vehicle according to claim 2, wherein acquiring vehicle driving information comprises: The on-board control system feeds back the speed of the vehicle; The GPS positioning system obtains the altitude of the vehicle; The navigation system obtains the vehicle driving route; The GPS positioning system predicts the road segment type of the vehicle's driving route according to the vehicle's driving route; The GPS positioning system predicts the distance between the vehicle and the traffic lights according to the driving route of the vehicle, and predicts the waiting time of the vehicle at the traffic lights according to the speed of the vehicle fed back by the on-board control system. 5 . The energy management method for a 48V hybrid vehicle according to claim 4 , wherein the working modes include an assist mode and an energy recovery mode. 6 . 6. The energy management method for a 48V hybrid vehicle according to claim 5, wherein, The road segment type includes an uphill road segment, a gentle road segment and a downhill road segment; When the vehicle is on an uphill section, the 48V motor starts the boost mode; When the vehicle is on a gentle road section, the 48V motor will start the boost mode or the energy recovery mode respectively according to whether the vehicle is in the acceleration state or the coasting state; When the vehicle is on a downhill road, the 48V motor activates the energy recovery mode. 7 . The energy management method for a 48V hybrid vehicle according to claim 4 , wherein the vehicle is controlled to turn off or enter an idle state according to the waiting time of the vehicle at a traffic light. 8 . 8 . The energy management method for a 48V hybrid vehicle according to claim 4 , wherein the vehicle control system comprises a vehicle front and rear distance detector, and the vehicle front and rear distance detector is used to detect the front and rear vehicle distance. 9 . 9 . The energy management method for a 48V hybrid vehicle according to claim 4 , wherein the navigation system detects surrounding vehicles, predicts the number of vehicles waiting for the traffic lights, and calculates the waiting time for the traffic lights. 10 . 10 . The energy management method for a 48V hybrid vehicle according to claim 4 , wherein the working state of the engine is judged according to the running speed of the vehicle, the distance between the vehicle and the switching node, and the distance between the vehicle and the traffic lights. 11 . . 11 . The energy management method for a 48V hybrid vehicle according to claim 1 , wherein the difference between the output power of the engine and the power required for driving of the vehicle is based on the driver’s control of the brake pedal and the road segment. 12 . Type conversion judgment. 12. The energy management method for a 48V hybrid vehicle according to claim 1, wherein the 48V motor is equipped with two energy storage mechanisms, a 12V battery and a 48V super capacitor, when the 48V motor works normally, all the The 12V battery is used as an energy storage mechanism, and when the 48V motor needs to frequently switch working modes, the 48V super capacitor is used as an energy storage mechanism. 13. An energy management system for a 48V hybrid vehicle, comprising: a starting module, the starting module is used to start the vehicle; an information acquisition module, the information acquisition module acquires vehicle driving information; a first processing module, the first processing module predicts the working state of the engine when the vehicle is running, and calculates the difference between the output power of the engine and the power required for the vehicle to run; The second processing module, the second processing module sets the switching node and the 48V motor working mode; An execution module, when the vehicle reaches the switching node, the execution module switches the 48V motor to the working mode. 14 . The energy management system for a 48V hybrid vehicle according to claim 13 , wherein the information acquisition module comprises a vehicle-mounted control system, a GPS positioning system and a navigation system. 15 . 15. A vehicle, characterized by comprising the energy management system of the 48V hybrid vehicle according to any one of claims 13-14.

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