CN108045367A - Plug-in hybrid system based on 4 wheel driven offroad vehicle - Google Patents

Abstract

The invention relates to a plug-in hybrid power system based on a four-wheel drive off-road vehicle, belonging to the technical field of hybrid electric vehicles. The hybrid power system of the present invention includes a vehicle controller, an engine controller, an engine, a transmission controller, an automatic transmission, a battery management system, a power battery, a motor controller, a motor, a transmission clutch, an electromagnetic clutch at a motor end, a DC-DC Converter, on-board charger, front-stage main reducer, rear-stage main reducer; the output end of the engine is connected to the intermediate reducer through the automatic transmission, and the intermediate reducer is respectively connected to the front-stage main reducer and the rear-stage main reducer ; The front-stage main reducer is coupled to the front axle, and the rear-stage main reducer is coupled to the rear axle; the output end of the motor is connected to the rear-stage main reducer. The hybrid power system of the present invention can realize low-speed acceleration assist, improve overtaking acceleration capability, meet customer driving requirements, and ensure driving safety and reliability.

Description

Plug-in hybrid system based on four-wheel drive off-road vehicle

technical field

The invention relates to the technical field of hybrid electric vehicles, more specifically, the invention relates to a plug-in hybrid power system based on a four-wheel drive off-road vehicle.

Background technique

The structure of the power system of the four-wheel drive gasoline vehicle in the prior art is shown in Figure 1. The battery capacity of the power system is small, and it only supplies/recovers energy during acceleration/deceleration, and cannot be charged externally. It has no pure electric function. Moreover, the power required to drive the vehicle is mainly provided by the engine, and the engine power is very large, which affects the economy and emission of the vehicle.

Contents of the invention

In order to solve the above-mentioned technical problems in the prior art, the object of the present invention is to provide a plug-in hybrid power system based on a four-wheel drive off-road vehicle.

In order to solve the technical problems described in the invention and realize the purpose of the invention, the present invention adopts the following technical solutions:

A plug-in hybrid system based on a four-wheel drive off-road vehicle is characterized in that it includes a vehicle controller, an engine controller, an engine, a transmission controller, an automatic transmission, a battery management system, a power battery, a motor controller, and a motor , transmission clutch, electromagnetic clutch at the motor end, DC-DC converter, on-board charger, front-stage main reducer, intermediate reducer, rear-stage main reducer, AC charging port, 12V battery, front axle and two A pair of driving front wheels at the end, a rear axle and a pair of driving rear wheels arranged at the two ends of the rear axle.

Wherein, the engine controller is connected to the engine through hard wires, the output end of the engine is connected to the intermediate speed reducer through the automatic transmission, and the intermediate speed reducer is respectively connected to the front-stage final drive and the rear-stage final drive, The front-stage final drive is coupled to the front axle, the rear-stage final drive is coupled to the rear axle, and the transmission clutch is arranged between the output end of the engine and the automatic transmission; the output of the motor terminal is connected to the final stage final reducer, and an electromagnetic clutch at the motor end is set between the motor and the rear stage final reducer; the vehicle controller is connected to the transmission controller and the battery management system through the CAN bus respectively , a DC-to-DC converter and an on-board charger; the transmission controller is connected to the engine controller through a CAN bus, and the transmission controller is respectively connected to the transmission clutch and the automatic transmission through hard wires; the battery management system is connected to the The CAN bus is connected to the motor controller, and is also connected to the power battery through hard wires; the motor controller is connected to the motor through high-voltage wires and hard wires; the power battery is connected to the motor controller, DC-to-DC converter through high-voltage wires charger and on-board charger; the on-board charger is connected to the AC charging port through a high-voltage line.

Wherein, the plug-in hybrid power system includes six driving modes, which are: engine independent driving mode, hybrid driving mode, driving power generation mode, regenerative braking mode, parking charging mode and pure electric mode.

Wherein, in the engine-only drive mode, the engine works, the transmission clutch engages, the vehicle controller controls the electromagnetic clutch at the motor end to disengage, and the motor is turned off.

Among them, in the hybrid drive mode: the engine works, the transmission clutch engages, the vehicle controller controls the electromagnetic clutch at the motor end to engage, and the motor drives.

Among them, in the driving power generation mode, the engine is working, the transmission clutch is engaged, the vehicle controller controls the electromagnetic clutch at the motor end to engage, the engine drives the motor to generate electricity, and the power battery and 12V battery are charged.

Among them, in the regenerative braking mode, the engine is idling, the transmission clutch is disengaged, the vehicle controller controls the electromagnetic clutch at the motor end to engage, and the motor generates power to charge the battery.

Among them, in the parking charging mode, the external device charges the power battery through the on-board charger during parking.

Among them, in the pure electric mode: the engine does not work, the transmission clutch is disengaged, the vehicle controller controls the electromagnetic clutch at the motor end to engage, and the motor drives.

Compared with the closest prior art, the plug-in hybrid system based on the four-wheel drive off-road vehicle of the present invention has the following beneficial effects:

The hybrid power system of the present invention can realize low-speed acceleration boosting, improve the overtaking acceleration ability, meet customer driving needs, and ensure driving safety and reliability, and has been applied to Alter PHEV vehicle control.

Description of drawings

FIG. 1 is a schematic diagram of a power system of a four-wheel drive gasoline vehicle in the prior art.

Fig. 2 is a schematic diagram of the structure of the plug-in hybrid power system based on the four-wheel drive off-road vehicle of the present invention.

Detailed ways

The plug-in hybrid power system based on the four-wheel drive off-road vehicle of the present invention will be further elaborated below in conjunction with specific embodiments, in order to make a more complete and clear description of the technical solution of the present invention.

Example 1

As shown in Figure 2, the plug-in hybrid system based on four-wheel drive off-road vehicle of the present embodiment comprises vehicle controller (VCU), engine controller (EMS), engine (ENG), transmission controller (TCU) , automatic transmission (AT), battery management system (BMS), power battery (Batt), motor controller (MCU), motor (TM), transmission clutch (Clutch1), motor end electromagnetic clutch (Clutch2), DC-DC conversion converter (DCDC), on-board charger (OBC), front-stage final reducer, intermediate reducer, rear-stage final reducer, front axle and a pair of driving front wheels arranged at both ends of the front axle, rear axle and rear axle A pair at each end drives the rear wheels. The engine controller (EMS) is connected to the engine (ENG) through a hard wire, and the output end of the engine (ENG) is connected to the intermediate speed reducer through the automatic transmission (AT), and the intermediate speed reducer is respectively connected to the front stage final drive and rear final drive, the front final drive is coupled to the front axle, the rear final drive is coupled to the rear axle, the output end of the engine (ENG) is connected to the automatic transmission The transmission clutch (Clutch1) is set between (AT); the output end of the motor (TM) is connected to the final stage final drive, and the motor (TM) is provided with the final final drive Electromagnetic clutch (Clutch2) at the motor end; the vehicle controller (VCU) is connected to the transmission controller (AT), battery management system (BMS), DC-to-DC converter (DCDC) and on-board charger respectively through the CAN bus (OBC); the transmission controller (TCU) is connected to the engine controller (EMS) by the CAN bus, and the transmission controller (TCU) is respectively connected to the transmission clutch (Clutch1) and the automatic transmission (AT) by a hard line ); the battery management system (BMS) is connected to the motor controller (MCU) through the CAN bus, and is also connected to the power battery (Batt) through a hard wire; the motor controller (MCU) is connected to the The motor (TM); the power battery (Batt) is connected to the motor controller (MCU), DC-to-DC converter (DCDC) and on-board charger (OBC) through a high-voltage line; the on-board charger (OBC) is connected to the Connect the high-voltage wire to the AC charging port (AC charge).

In this embodiment, the engine (ENG) is used as the main power output device of the four-wheel drive hybrid electric vehicle; the transmission clutch and the electromagnetic clutch at the motor end are used to transmit power and switch on and off the power transmission at the same time. The power battery provides the electric energy required by the rear motor (TM) for driving the car, and the battery manager (BMS) manages the power battery; the engine control (EMS) is used to control the engine (ENG ) to control. The DC-DC converter (DCDC) is used for electric energy conversion; the vehicle controller (VCU) is used for engine controller (EMS), battery management system (BMS), on-board charger (OBC), transmission Management of the controller (TCU) and the electromagnetic clutch (Clutch2) at the motor side.

In the plug-in hybrid system based on the four-wheel drive off-road vehicle in this embodiment, when the engine is started, the electromagnetic clutch at the motor end is engaged, and the motor quickly starts the engine; when the vehicle starts, the transmission clutch is disengaged, and the power transmission between the motor and the engine is disconnected. , driven by the motor alone; when driving at low speed or when the engine efficiency is low, the transmission clutch is disengaged, the electromagnetic clutch at the motor end is engaged, and the motor drives the vehicle independently. According to the remaining battery power, the electromagnetic clutch at the motor end can be engaged, and the engine drives the motor to generate electricity; When the vehicle accelerates rapidly, both the transmission clutch and the electromagnetic clutch at the motor end are engaged, and the engine and the motor drive the vehicle at the same time, so that the powertrain works in parallel mode; when the vehicle is running at a constant speed and the engine efficiency is high, the transmission clutch is engaged, and the engine Drive the vehicle independently. According to the battery power, the electromagnetic clutch at the motor end can be engaged, so that the engine can drive the motor to generate electricity, charge the power battery and the 12V battery, and realize the electric balance of the whole vehicle; The electromagnetic clutch is closed, and the wheels drive the motor through the transmission device to charge the power battery; when the vehicle is running in reverse, the transmission clutch is disengaged, the electromagnetic clutch at the motor end is closed, the electric motor is driven independently, and the vehicle rotates in the opposite direction.

The plug-in hybrid power system of the present embodiment has a total of 6 vehicle driving modes, and the working conditions of each assembly are as follows:

①Engine independent drive mode (high-speed working condition, motor protection): The engine is working, the transmission clutch is engaged, the vehicle controller controls the electromagnetic clutch at the motor end to separate, and the motor is turned off. ②Hybrid drive mode (low-speed acceleration boost): The engine works, the transmission clutch engages, the vehicle controller controls the electromagnetic clutch at the motor end to engage, and the motor drives. ③Driving power generation mode (keep the battery power to provide acceleration boost and other electrical accessories power requirements at any time): the engine works, the transmission clutch is engaged, the vehicle controller controls the electromagnetic clutch at the motor end to engage, the engine drives the motor to generate electricity, and the power battery and 12V battery are charged . ④Regenerative braking mode (to improve energy utilization and reduce brake pad wear): The engine works, the transmission clutch is disengaged, the vehicle controller controls the electromagnetic clutch at the motor end to engage, and the motor generates power to charge the power battery. ⑤Parking charging mode (saving driving costs): External devices can charge the power battery through the on-board charger during parking. ⑥Pure electric mode (frequent acceleration and deceleration in the city can achieve "zero" emissions): the engine does not work, the transmission clutch is disengaged, the vehicle controller controls the electromagnetic clutch at the motor end to engage, and the motor drives.

The plug-in hybrid power system of this embodiment satisfies the start-up and low-speed acceleration requirements of the whole vehicle, and at the same time adjusts the engine working area to make it work under the optimal working conditions of low fuel consumption and less pollution. When the load is large, the insufficient power is supplemented by the battery. When the load is small, the excess power of the engine can be used to drive the motor to generate power to charge the power battery and 12V battery to maintain the vehicle's electrical balance. In urban working conditions with frequent acceleration and deceleration, the internal combustion engine can be turned off , is driven by the battery alone to achieve "zero" emissions. When parking, external equipment can be used to charge the power battery through the on-board charger, reducing driving costs.

For those of ordinary skill in the art, the specific embodiment is only an exemplary description of the present invention, and obviously the specific implementation of the present invention is not limited by the above-mentioned methods, as long as the method concept and technical solutions of the present invention are used to carry out various Immaterial improvements, or direct application of the concept and technical solutions of the present invention to other occasions without improvement are within the protection scope of the present invention.

Claims (9)

1. a kind of plug-in hybrid system based on 4 wheel driven offroad vehicle, it is characterised in that：Including entire car controller, engine Controller, engine, gearbox controller, automatic transmission, battery management system, power battery, electric machine controller, motor, Transmission clutch, motor side electromagnetic clutch, DC-to-dc converter, Vehicular charger, prime main reducing gear, centre subtract Fast device, rear class main reducing gear, AC charge port, 12V accumulators, front axle and before being arranged on a pair of of driving at front axle both ends Wheel, back axle and a pair of of the driving trailing wheel for being arranged on back axle both ends.

2. the plug-in hybrid system according to claim 1 based on 4 wheel driven offroad vehicle, it is characterised in that：The hair Motivation controller is connected by rigid line with engine, and the output terminal of engine is connected by automatic transmission with intermediate gearbox, And the intermediate gearbox is respectively connected to the prime main reducing gear and rear class main reducing gear, the prime main reducing gear coupling On front axle, the rear class main reducing gear is coupling on back axle, the output terminal of the engine and the automatic transmission Between the transmission clutch is set；The output terminal of the motor is connected with rear class main reducing gear, and the motor and institute It states and is provided with motor side electromagnetic clutch between rear class main reducing gear；The entire car controller connects institute by CAN bus respectively State gearbox controller, battery management system, DC to DC converter and Vehicular charger；The gearbox controller leads to It crosses CAN bus and connects the engine controller, the gearbox controller connects the speed changer clutch by rigid line respectively Device and automatic transmission；The battery management system connects electric machine controller by CAN bus, also connected by rigid line described in Power battery；The electric machine controller connects the motor with rigid line by high-voltage line respectively；The power battery passes through high pressure Line connects the electric machine controller, DC to DC converter and Vehicular charger；The Vehicular charger passes through high-voltage line Connect AC charge port.

3. the plug-in hybrid system according to claim 1 based on 4 wheel driven offroad vehicle, it is characterised in that：It is described to insert Electric-type hybrid power system includes six kinds of driving modes, is respectively：Pattern, combination drive pattern, driving is operated alone in engine Power generation mode, braking mode, stopping for charging pattern and pure power mode.

4. the plug-in hybrid system according to claim 3 based on 4 wheel driven offroad vehicle, it is characterised in that：Starting When pattern is operated alone in machine, engine work, transmission clutch engagement, vehicle control unit controls motor side electromagnetic clutch point From motor is closed.

5. the plug-in hybrid system according to claim 3 based on 4 wheel driven offroad vehicle, it is characterised in that：It is mixing Drive pattern：Engine works, transmission clutch engagement, the engagement of vehicle control unit controls motor side electromagnetic clutch, motor Driving.

6. the plug-in hybrid system according to claim 3 based on 4 wheel driven offroad vehicle, it is characterised in that：It is driving a vehicle During power generation mode, engine work, transmission clutch engagement, the engagement of vehicle control unit controls motor side electromagnetic clutch, hair Motivation drives electric power generation, and power accumulator and 12V accumulators charge.

7. the plug-in hybrid system according to claim 3 based on 4 wheel driven offroad vehicle, it is characterised in that：It is regenerating During braking mode, engine work, transmission clutch separation, the engagement of vehicle control unit controls motor side electromagnetic clutch, electricity Machine power generation charges the battery.

8. the plug-in hybrid system according to claim 3 based on 4 wheel driven offroad vehicle, it is characterised in that：It stops During charge mode, external equipment is charged by onboard charger to high-tension battery during parking.

9. the plug-in hybrid system according to claim 3 based on 4 wheel driven offroad vehicle, it is characterised in that：In pure electricity During pattern, engine does not work, transmission clutch separation, the engagement of vehicle control unit controls motor side electromagnetic clutch, motor Driving.