CN107985047A - A kind of distribution twin shaft Dual-motors Driving pure electric vehicle dynamical system - Google Patents

Abstract

A distributed dual-axis dual-motor drive pure electric power system, at least including a first motor, a second motor, a front differential, a front final drive, a rear differential, a rear final drive, an inverter, and a high-voltage cabinet , charger, external charging plug, battery and vehicle controller; the first motor is connected to the front differential through the front main reducer, and the second motor is connected to the rear differential through the rear main reducer; the battery is connected to the high-voltage cabinet, inverter The charger is connected to the first motor and the second motor respectively, and the charger is connected to the high-voltage cabinet. The charger is equipped with an external charging connector, and the external charging connector is connected to the external power socket when parking and charging; the vehicle controller is connected to the battery and the inverter. connected. In the present invention, two relatively low-power motors drive the front and rear axles of the vehicle respectively. Under the premise of ensuring the same dynamic performance of the whole vehicle, the load rate of the motors is greatly improved and the power consumption is reduced when the vehicle load conditions are the same; More energy can be recovered during braking energy recovery, which is beneficial to shorten the braking distance.

Description

A distributed dual-axis dual-motor drive pure electric power system

technical field

The invention relates to the field of automobile power drive systems, in particular to a distributed dual-axis dual-motor drive pure electric power system.

Background technique

With the increasingly serious environmental problems and the oil crisis, countries have introduced policies and regulations. On the one hand, traditional vehicles fueled by oil and gasoline have been restricted and impacted. It is required to become a research hotspot in universities, scientific research institutions and large car companies in various countries. As the most promising and important branch of new energy vehicles, electric vehicles have renewable energy and are completely non-polluting, so they have been set as the ultimate strategic goal of the current transformation of the automobile industry in my country.

CN201520197372.8 discloses an electric vehicle power system, which changes the first-speed reducer used in the electric vehicle transmission system into a two-speed transmission or a multi-speed transmission. The torque and speed of the vehicle have greatly improved the NVH performance of the vehicle, but the power system is driven by a single motor. When the vehicle load is low, the load rate of the motor is low and the work efficiency is low.

CN201420732244.4 discloses a power system of an electric vehicle and an electric vehicle. The power system of the electric vehicle and the electric vehicle are equipped with a battery pack connected to the motor, and part of the mechanical energy in the running process is converted into electric energy and charged into the battery, increasing the The electric quantity in the storage battery is increased, and the mileage of driving has been improved, but the power system of the electric vehicle and the weight of the electric vehicle are too large, and the additional storage battery has also increased the cost and increased the difficulty of installation.

CN201620016378.5 discloses an electric vehicle power system. The electric vehicle power system proposes to ensure the smoothness of the shift and improve the quality of the shift through the combination and separation of the clutch between the motor and the transmission input shaft when the vehicle shifts gears. The structure is relatively complicated, which increases the cost and the difficulty of shift control, and does not take into account the impact when the clutch is engaged, failing to solve the problem substantially.

CN201610060247.1 discloses an electric vehicle power system assembly and an electric vehicle. The electric vehicle power system assembly and the electric vehicle propose a battery management system, which collects battery signals and sends them to the controller to manage the battery and improve The endurance of the electric vehicle is improved, but the increase of the endurance is achieved by adding a battery pack, which increases the weight and cost of the vehicle.

Contents of the invention

The technical problem to be solved by the present invention is to provide a distributed dual-axis dual-motor drive pure electric power system for the above-mentioned deficiencies in the existing automobile power system, in which two relatively small-power motors drive the front and rear axles of the vehicle respectively, Under the premise of keeping the dynamic performance of the whole vehicle unchanged, under the same vehicle load conditions, the load rate of the motor is greatly increased to reduce power consumption; the double-axis dual-motor can recover more energy during braking energy recovery, which is beneficial to shorten the braking distance.

The technical scheme that the present invention adopts for solving the problems of the technologies described above is:

A distributed dual-axis dual-motor drive pure electric power system, at least including a first motor, a second motor, a front differential, a front final drive, a rear differential, a rear final drive, an inverter, and a high-voltage cabinet , a charger, an external charging plug, a battery and a vehicle controller; the first motor is connected to the front differential through the front final drive, and the output power of the first motor output drives the vehicle through the front final drive and the front differential The front axle; the second motor is connected to the rear differential through the rear final drive, and the output power of the second motor drives the rear axle of the vehicle through the rear final drive and the rear differential; the battery passes through the high-voltage cabinet, inverter The charger is respectively connected with the first motor and the second motor (the output end of the battery provides electric energy for the first motor and the second motor respectively through the high-voltage cabinet and the inverter), the charger is connected with the high-voltage cabinet, and the charger is equipped with external charging Connector, the external charging connector is connected to an external power socket when parking and charging, and charges the battery through a charger and a high-voltage cabinet; the vehicle controller is connected to a battery and an inverter to control the entire power system.

According to the above solution, the first motor and the second motor are designed to have the same success rate or different power according to requirements.

According to the above scheme, the power system also includes a front gearbox and a rear gearbox, the first motor is connected to the front gearbox, the front final drive, and the front differential in sequence, and the output power of the first motor output passes through the front gearbox, the front The main reducer and the front differential drive the front axle of the vehicle; the second motor is sequentially connected to the rear gearbox, the rear main reducer, and the rear differential, and the output power of the second motor output passes through the rear gearbox and the rear final drive. , The rear differential drives the rear axle of the vehicle.

According to the above scheme, the front gearbox and the rear gearbox are selected according to requirements and the number of gears is set.

The working principle of the present invention: when the vehicle is running, according to the load state of the vehicle, the vehicle controller controls the vehicle to drive in different driving modes: single motor driving mode, when the vehicle load is low, one of the motors in the system passes through the gearbox, The main reducer drives the vehicle alone, and the other motor is turned off; in the dual-motor joint drive mode, when the vehicle load is high, it is difficult for a single motor to work to meet the demand. The two motors of the system jointly drive the vehicle through their respective transmission systems and distribute the load to Two motors; braking energy recovery mode, when the vehicle controller detects the braking signal, the two motors recover part of the braking energy and convert it into electric energy to charge the battery, which improves the braking energy recovery rate and shortens the braking time. Distance; parking charging mode, when the vehicle is parked, the external charging plug is connected to the external charging socket to charge the battery to keep the battery fully charged.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, the single drive of the high-power motor of the pure electric vehicle is replaced by two small-power motors, and the front and rear axles are respectively driven by the front and rear motors and their respective transmission systems. According to the driving requirements of the vehicle, the overall dynamic performance of the vehicle is guaranteed to remain unchanged. Under the premise of the same vehicle load, the vehicle can be driven by a single motor or jointly driven by two motors. Compared with a single high-power single motor driven alone, the working efficiency of a single motor is greatly improved under the same vehicle load conditions, and the power consumption is reduced. The vehicle can work in both In the two-wheel drive mode, it can also realize timely four-wheel drive, which increases the mileage and dynamic controllability;

2. According to the driving needs of the vehicle, different modes can be switched. When the demand is small, it is driven by a single motor, and when the demand is large, it is driven by two motors. Compared with the high-power motor driving alone, the load of a single motor is increased under the same vehicle load conditions. High efficiency, which significantly improves the working efficiency of the motor, reduces power consumption, and greatly improves the economy of the vehicle;

3. The dual-axis dual-motor can recover more energy during braking energy recovery, which is beneficial to shorten the braking distance.

Description of drawings

Fig. 1 is a schematic structural view of a distributed dual-axis dual-motor drive pure electric power system of the present invention;

In the figure, 1- front differential; 2- front main reducer; 3- front gearbox; 4- first motor; 5- high voltage cabinet; 6- charger; 7- external charging plug; 8- battery; 9 -rear differential; 10-rear final drive; 11-rear gearbox; 12-second motor; 13-vehicle controller; 14-inverter.

Detailed ways

The principles and features of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, the distributed dual-axis dual-motor drive pure electric power system of the present invention includes a first motor 4, a second motor 12, a front differential 1, a front final drive 2, and a front gearbox 3 , rear differential 9, rear final drive 10, rear gearbox 11, inverter 14, high voltage cabinet 5, charger 6, external charging plug 7, battery 8 and vehicle controller 13, first motor 4 in sequence Connect the front gearbox 3, the front main reducer 2, and the front differential 1, and the output power of the first motor 4 drives the front axle of the vehicle through the front gearbox 3, the front final reducer 2, and the front differential 1; the second The motor 12 is sequentially connected to the rear gearbox 11, the rear final drive 10, and the rear differential 9, and the output power of the second motor 12 drives the rear axle of the vehicle through the rear gearbox 11, the rear final drive 10, and the rear differential 9. ;

The battery 8 is connected to the first motor 4 and the second motor 12 respectively through the high voltage cabinet 5 and the inverter 14, and the output terminal of the battery 8 provides electric energy for the first motor 4 and the second motor 12 respectively through the high voltage cabinet 5 and the inverter 14 , the charger 6 is connected with the high-voltage cabinet 5, and the charger 6 is equipped with an external charging connector 7, and the external charging connector 7 is connected with an external power socket when parking and charging, and the battery 8 is charged through the charger 6 and the high-voltage cabinet 5;

The vehicle controller 13 is connected with the battery 8 and the inverter 14, and is used to control the entire power system.

The present invention changes the drive of the existing pure electric vehicle high-power single motor into two low-power motors to drive the front and rear axles respectively. The first motor 4 and the second motor 12 can be designed with the same success rate or different power according to requirements. The first motor 4, The front and rear positions of the second motor 12 can be exchanged.

The front gearbox 3 and the rear gearbox 11 can be selected according to requirements and the number of gears can be set, or no gearbox can be provided according to requirements, and the first motor 4 is directly connected to the front differential 1 through the front final drive 2 to drive the front of the vehicle. bridge, the second motor 12 is directly connected to the rear differential 9 through the rear final drive 10 to drive the rear axle of the vehicle.

During the driving process of the vehicle, according to the load status of the vehicle, the vehicle controller controls the vehicle to drive in different driving modes. The driving modes include single motor driving mode, dual motor driving mode, braking energy recovery mode and parking charging mode. as follows:

1. Single motor drive mode

When the vehicle is running in a low-load working condition, the vehicle controller 13 controls one of the first motor 4 and the second motor 12 to turn on, and the other motor to turn off, and the turned-on motor passes through the gearbox connected to it, the main reduction gear Compared with the traditional pure electric vehicle driven by a high-power motor alone, the load rate is low and the working efficiency of the motor is low. Instead, it is driven by a single motor with a small power, which can not only meet the driving requirements of the vehicle, but also ensure the The motor works in a relatively more efficient range.

2. Dual motor common drive mode

When the vehicle is running under a relatively high load condition, a single motor is difficult to meet the driving needs of the vehicle. At this time, the vehicle controller controls both the first motor 4 and the second motor 12 to turn on, and distributes the load to the two motors. The first motor 4. The second motor 12 jointly drives the vehicle through its own transmission system, so that the two motors have a relatively high load rate and work in their respective high-efficiency ranges.

3. Brake energy recovery mode

When the vehicle controller detects the braking signal, the first motor 4 and the second motor 12 jointly recover the energy generated during braking, and convert the mechanical energy into electrical energy and store it in the battery 8. Compared with the energy recovered by a single motor , The energy recovery rate is higher, which is beneficial to shorten the braking distance.

4. Parking charging mode

When the vehicle is idle or the battery is low and needs to be charged, the external charging plug 7 can be connected to the charging socket of the charging pile to charge the battery 8 to ensure that the battery 8 is fully charged for use. When the battery 8 is charged to the set charging point Time limit, vehicle controller 13 can cut off charging circuit automatically, prolongs the service life of battery.

The above content has been exemplified in conjunction with the accompanying drawings to the present invention. The selection of the transmission, the presence or absence and the setting of the number of gears can be designed according to the needs, and the power of the two motors can be designed to be the same or different according to the needs. In terms of structure and layout The modification or modification of the present invention is regarded as the technical solution equivalent to the present invention, and therefore also within the protection scope of the present invention.

Claims (4)

1. A kind of 1. distribution twin shaft Dual-motors Driving pure electric vehicle dynamical system, it is characterised in that：Including at least the first motor (4), Second motor (12), front differential mechanism (1), preceding main reducing gear (2), rear differential mechanism (9), rear primary gearbox (10), inverter (14), High-voltage board (5), charger (6), external charge plug (7), battery (8) and entire car controller (13)；First motor (4) warp Preceding main reducing gear (2) connection front differential mechanism (1), the first motor (4) output terminal output premenstrual main reducing gear of power (2), preceding differential Bridge before device (1) driving vehicle；Second motor (12) differential mechanism (9), second motor after rear primary gearbox (10) connection (12) output terminal output power through rear primary gearbox (10), after differential mechanism (9) driving vehicle rear axle；The battery (8) is through high pressure Cabinet (5), inverter (14) are connected with the first motor (4), the second motor (12) respectively, the charger (6) and high-voltage board (5) phase Even, it is configured with external charge connector (7) on charger (6), the external charge connector (7) is in stopping for charging and external power supply Socket is connected, and charged machine (6), high-voltage board (5) charge for battery (8)；The entire car controller (13) and battery (8), inversion Device (14) is connected, for being controlled to whole dynamical system.
2. 2. distribution twin shaft Dual-motors Driving pure electric vehicle dynamical system according to claim 1, it is characterised in that：Described One motor (4), the second motor (12) design that success rate is identical or power is different according to demand.
3. 3. distribution twin shaft Dual-motors Driving pure electric vehicle dynamical system according to claim 1, it is characterised in that：Dynamical system System further includes front gear box (3) and rear transmission gear box (11), and first motor (4) is sequentially connected front gear box (3), preceding main deceleration Device (2), front differential mechanism (1), the first motor (4) output terminal export power through front gear box (3), preceding main reducing gear (2), preceding differential Bridge before device (1) driving vehicle；Second motor (12) is sequentially connected rear transmission gear box (11), rear primary gearbox (10), rear differential Device (9), the second motor (12) output terminal export power through rear transmission gear box (11), rear primary gearbox (10), after differential mechanism (9) drive Vehicle rear axle.
4. 4. distribution twin shaft Dual-motors Driving pure electric vehicle dynamical system according to claim 3, it is characterised in that：Before described Gearbox (3) and rear transmission gear box (11) type selecting and set gear number according to demand.