CN201784618U - Parallel hybrid power-driven system - Google Patents

Abstract

The utility model provides a hybrid hybrid drive system, which belongs to the technical field of automobiles. It solves the problem that the existing hybrid drive system cannot fully adapt to various driving conditions. The hybrid drive system includes a power battery, a vehicle controller, a main drive mechanism and a slave drive mechanism, and the slave drive mechanism includes an engine, an ISG motor, a gearbox, and an ISG motor controller capable of controlling the ISG motor. The engine, ISG The motor and gearbox are sequentially connected coaxially. The ISG motor controller is electrically connected to the power battery and the ISG motor respectively. The main drive mechanism includes two hub motors and two hub motor controllers respectively connected to the two rear wheels. The hub motor controllers are electrically connected to the power battery and the vehicle controller respectively, and the ISG motor controller and gearbox are electrically connected to the vehicle controller. The hybrid drive system has the advantage of being suitable for various driving conditions.

Description

A hybrid drive system

technical field

The utility model belongs to the technical field of automobiles, and relates to a drive system, in particular to a hybrid hybrid drive system.

Background technique

The existing hybrid drive system combines the advantages of the internal combustion engine and the electric motor drive system, and has great market prospects. The current hybrid drive system generally adopts a gear coupling transmission structure and is equipped with a speed change system. However, there are some problems in this drive system mode: the main reason is that the drive system cannot be completely suitable for various driving conditions, and at the same time, the structure is complex, the coordination and matching between power systems is difficult, and the internal combustion engine and motor control are difficult.

Contents of the invention

The purpose of the utility model is to solve the above-mentioned problems in the existing technology, and propose a hybrid hybrid driving system that can adopt different driving modes according to different driving conditions of the vehicle so that the system can adapt to various driving conditions.

The purpose of this utility model can be achieved through the following technical solutions: a hybrid hybrid drive system, including a power battery, a vehicle controller, a main drive mechanism connected to the rear wheel and a slave drive mechanism connected to the front wheel drive axle , the said slave driving mechanism includes an engine, an ISG motor, a gearbox and an ISG motor controller capable of controlling the work of the above-mentioned ISG motor, the engine, the ISG motor and the gearbox are sequentially connected coaxially, and the gearbox is also connected with the front wheel drive axle , the ISG motor controller is electrically connected with the above-mentioned power battery and the ISG motor respectively, and it is characterized in that: the main drive mechanism includes two in-wheel motors respectively connected to the two rear wheels and two respectively controllable In-wheel motor controllers that work with the above-mentioned two in-wheel motors, the two in-wheel motor controllers are respectively electrically connected to the above-mentioned power battery and the vehicle controller, and the above-mentioned ISG motor controller and gearbox are electrically connected to the vehicle controller connect.

The functions and implementation methods of the driving system in this hybrid mode are as follows:

Pure electric rear drive driving: When the SOC value of the power battery is high, the system provides energy from the power battery to the hub motor to drive the rear wheels to achieve pure electric drive, and it mostly operates in starting conditions and low-speed and small-load conditions.

Front-drive driving of the engine, driving power generation: When the SOC of the power battery is lower than the limit value, the ISG motor will bring the engine to a certain speed and start it, and transmit the driving torque of the engine to the front wheel drive axle through the gearbox. At this time, the ISG motor can be in three states: idling, generating and driving, the details are as follows:

(1) When the engine has surplus power, the ISG motor absorbs part of the power to generate electricity to charge the power battery, so as to adjust the engine to work in the region with better fuel economy. At this time, the state of the ISG motor is power generation;

(2) When the driving force demand of the vehicle exceeds the bearing range of the engine, the ISG motor works in the driving state to assist the engine to meet the driving demand of the vehicle. At this time, the ISG motor is in the driving state. If it cannot meet , then the hub motor controller controls the hub motor to be in the driving state for common driving;

(3) When the driving force demand of the whole vehicle just makes the engine work in the low fuel consumption area, the state of the ISG motor at this time is idling.

Hybrid drive driving: When the vehicle is running at full load or overspeeding or accelerating rapidly, the engine and the hub motor are jointly driven in a hybrid manner, which is a four-wheel drive mode.

Parking charging: When the vehicle is stationary, when the SOC is low, the engine starts, the ISG motor is in the power generation state to charge the power battery, and the gearbox separates the connection between the engine and the front wheel drive axle.

Braking energy recovery: When decelerating or braking, if the SOC allows, the in-wheel motor works in the power generation state to recover the braking energy to charge the power battery.

Two reversing modes: This system can adopt two reversing modes, one is in the normal engine driving mode, and the other can only be driven by the hub motor, when only the hub motor is involved in the drive, the gearbox will drive the engine Separated from the connection of the front wheel drive axle, the hub motor is reversed and controlled to run within a certain speed range to ensure a safe reversing speed, and complete the reversing by driving the rear wheels.

The above-mentioned functions and implementation methods of this system are all controlled by the vehicle controller through the control of the ISG motor controller and the two hub motor controllers to automatically control the working status of the ISG motor and the two hub motors. Through flexible The control strategy can realize the various drive modes required by the hybrid drive of the whole vehicle, and the body controller can also control the working state of the gearbox so that the engine can be connected or disconnected from the front wheel drive axle as required.

In the aforementioned hybrid drive system, the gearbox is a DCT gearbox.

Compared with the prior art, this hybrid hybrid drive system realizes the hybrid drive demand by controlling the ISG motor controller, the two-wheel hub motor controller and the working conditions of the DCT gearbox by the vehicle controller according to different actual driving conditions. Various driving modes make the corresponding driving mode the most energy-saving under various driving conditions, thereby saving energy, improving energy utilization rate and reducing cost. This system also has the functions of parking charging and energy recovery during braking. The parking charging function can make its mileage equivalent to that of an internal combustion engine vehicle without external charging; the energy recovery function during braking can be used during braking or deceleration. The energy is recovered and reused under certain circumstances, so that the energy can be fully utilized. At the same time, the system is simple in structure and can achieve automatic control accurately.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Fig. 2 is a structural representation of the utility model.

1. Engine; 2. ISG motor; 3. DCT gearbox; 4. Front wheel drive axle; 5. ISG motor controller; 6. Power battery; 7. Hub motor controller; 8. Hub motor; 9. Complete vehicle controller.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figures 1 and 2, the hybrid hybrid drive system includes a power battery 6, a vehicle controller 9, a main drive mechanism connected to the rear wheels and a slave drive mechanism connected to the front wheel drive axle 4, the slave drive mechanism It includes an engine 1, an ISG motor 2, a DCT gearbox 3 and an ISG motor controller 5 capable of controlling the ISG motor 2. The engine 1, the ISG motor 2 and the DCT gearbox 3 are sequentially connected coaxially, and the DCT gearbox 3 is also connected to the front The wheel drive axle 4 is connected, the ISG motor controller 5 is electrically connected with the power battery 6 and the ISG motor 2 respectively, and the main driving mechanism includes two hub motors 8 respectively connected to the two rear wheels and two hub motors capable of controlling the two hub motors respectively. 8. The working hub motor controller 7, the two hub motor controllers 7 are electrically connected to the power battery 6 and the vehicle controller 9 respectively, and the ISG motor controller 5 and the DCT gearbox 3 are electrically connected to the vehicle controller 9 .

The functions and implementation methods of the driving system in this hybrid mode are as follows:

Pure electric rear drive driving: When the SOC value of the power battery 6 is high, the system provides energy from the power battery 6 to the hub motor 8 to drive the rear wheels to achieve pure electric drive, and mostly operates in the starting condition and low-speed and small-load condition .

Engine front-drive driving, driving power generation: when the SOC of the power battery 6 is lower than the limit value, the ISG motor 2 will start the engine 1 to a certain speed value, and the driving torque of the engine 1 will be transmitted to the front wheels through the DCT gearbox 3 drive axle 4. At this time, the ISG motor 2 can be in three states: idling, power generation and driving, the details are as follows:

(1) When the engine 1 has surplus power, the ISG motor 2 absorbs a part of the power to generate electricity to charge the power battery 6, so as to adjust the engine to work in a region with better fuel economy. At this time, the state of the ISG motor 2 is power generation;

(2) When the driving force demand of the vehicle exceeds the bearing range of the engine 1, the ISG motor 2 works in the driving state to assist the engine 1 to meet the driving demand of the vehicle. At this time, the ISG motor 2 is in the driving state. If still not satisfied, then the hub motor controller 7 controls the hub motor 8 to be in a driving state for common driving;

(3) When the driving force requirement of the whole vehicle just makes the engine 1 work in the low fuel consumption area, the state of the ISG motor 2 is idling.

Hybrid driving: when the whole vehicle is running at full load or overspeeding or accelerating rapidly, the engine 1 and the in-wheel motor 8 are jointly driven in a hybrid manner, which is a four-wheel drive mode.

Parking charging: When the vehicle is stationary, when the SOC is low, the engine 1 starts, the ISG motor 2 is in the power generation state to charge the power battery 6, and the DCT gearbox 3 separates the connection between the engine 1 and the front wheel drive axle 4.

Braking energy recovery: When decelerating or braking, if the SOC allows, the in-wheel motor 8 works in the power generation state to recover the braking energy to charge the power battery 6 .

Two reversing modes: This system can adopt two reversing modes, one is driven by conventional engine 1, and the other can be driven only by hub motor 8. When only hub motor 8 is involved in driving, DCT at this time The gearbox 3 separates the connection between the engine 1 and the front wheel drive axle 4, and the in-wheel motor 8 is reversed and controlled to run within a certain speed range to ensure a safe reversing speed, and the reversing is completed by driving the rear wheels.

In the functions and implementations of the system mentioned above, the vehicle controller 9 controls the ISG motor controller 5 and the two hub motor controllers 7 respectively to monitor the working status of the ISG motor 2 and the two hub motors 8. Automatic control, through flexible control strategies to achieve various drive modes required by the hybrid drive of the vehicle, the body controller can also control the working state of the DCT gearbox 3 so that the engine 1 can be connected or disconnected from the front wheel drive axle 4 as required .

The in-wheel motor 8 in this system has strong driving capability and the ability to drive the entire vehicle independently. In addition, the in-wheel motor 8 can work in both electric and power generation modes as required, and can switch between forward and reverse rotation under the regulation of the in-wheel motor controller 7 to meet the needs of various driving modes of the vehicle. This system can also realize four-wheel drive and has strong power. The abundant power of the engine 1 can be better utilized for power generation and storage when driving. It also has the function of braking capacity recovery, which is conducive to the effective use of energy and the driving range. Comparable to a regular car. The DCT gearbox 3 is matched with the hybrid power system, and the effect of energy saving and emission reduction is very obvious.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (2)

1. A hybrid drive system comprising a power battery (6), a vehicle controller (9), a main drive mechanism connected to the rear wheels and a slave drive mechanism connected to the front wheel drive axle (4), the The said slave driving mechanism includes engine (1), ISG motor (2), gearbox and ISG motor controller (5) capable of controlling the work of above-mentioned ISG motor (2), engine (1), ISG motor (2) and variable speed The box is sequentially connected coaxially, and the gearbox is also connected with the front wheel drive axle (4), and the ISG motor controller (5) is electrically connected with the above-mentioned power battery (6) and the ISG motor (2) respectively, and its It is characterized in that: the main driving mechanism includes two hub motors (8) respectively connected to the two rear wheels and two hub motor controllers (7) capable of respectively controlling the operation of the two hub motors (8), the The two wheel hub motor controllers (7) are electrically connected to the above-mentioned power battery (6) and the vehicle controller (9) respectively, and the above-mentioned ISG motor controller (5) and the gearbox and the vehicle controller (9) electrical connection. 2. A hybrid drive system according to claim 1, characterized in that the gearbox is a DCT gearbox (3).

Images