CN101293478A - Plug-in integrated starter-generator hybrid car drive system - Google Patents

Abstract

The invention discloses a plug-in integrated starter-generator hybrid car drive system in the field of vehicle engineering technology, wherein: the engine is connected coaxially with the integrated starter-generator, the integrated starter-generator is connected with the driving disc of the automatic clutch, and the automatic clutch is driven by The motor is connected to the planetary gear mechanism, the planetary gear mechanism is respectively connected to the drive motor and the final reducer-differential, the final reducer-differential is connected to the wheels through the drive axle, and the power battery pack is connected to the motor controller and the external drive through cables. The power plug is connected, and the motor controller is respectively connected with the integrated starter generator and the drive motor through cables. The outer ring gear of the planetary gear mechanism is fixedly connected with the vehicle frame. The invention maintains the structure of the traditional vehicle to the greatest extent, and optimizes the working point of the engine by using dual motors, so that the engine can run stably in a high-efficiency and low-emission area, and is especially suitable for urban low-speed bus operation.

Description

Plug-in integrated starter-generator hybrid car drive system

technical field

The invention relates to a car drive system in the technical field of vehicle engineering, in particular to a plug-in integrated starter-generator hybrid car drive system.

Background technique

With the tension of world energy and the strengthening of human environmental awareness, safety, energy saving and environmental protection have become the themes of today's automobile development. As one of the new energy vehicles, hybrid vehicles can better solve the above problems. A hybrid vehicle is a vehicle that is jointly driven by an engine and an electric motor system. The engine can be an internal combustion engine using multiple fuels; the motor can be either a permanent magnet motor or an excitation motor, a synchronous motor or an asynchronous motor. Plug-in hybrid electric vehicles, namely PHEV (Plug-in Hybrid Vehicle), can use household power outlets (such as 220V power supply) to charge batteries while having the advantages of ordinary hybrid electric vehicles and pure electric vehicles. For long-distance driving, the internal combustion engine-based hybrid mode can be used, while for daily short-distance driving, the all-electric mode can be used to achieve zero fuel consumption and zero emissions. Therefore, plug-in hybrid electric vehicles have higher fuel efficiency, reduce dependence on fossil fuels, and reduce the cost of using vehicles.

After searching the literature of the prior art, it is found that the patent 03128810.3 discloses a drive system for a hybrid electric vehicle, which provides a vehicle with better economy and lower emissions than traditional vehicles, and can be driven by two different power sources, which can realize Recycling of braking energy to improve engine efficiency in hybrid vehicle drive systems. It includes engine, front wheel, storage battery, wheel hub motor, rear wheel, generator, rear axle, which provides the initial application of hybrid technology, but does not give full play to the advantages of hybrid power.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the prior art, and provide a plug-in integrated starter-generator hybrid car drive system, which is mainly driven by a motor, equipped with other supplementary energy sources, and can expand the continuous driving of a hybrid car through a generator set Mileage, on the basis of saving manufacturing and transformation costs to the greatest extent, realizes the purpose of saving fuel and ensuring the power performance of the whole vehicle, and overcomes the shortcomings of hybrid vehicle drive devices in auxiliary transmission, gear shifting and rotating clutches in planetary gear transmission.

The present invention is achieved through the following technical solutions:

The plug-in integrated starter-generator hybrid car drive system involved in the present invention includes: wheels, final reducer-differential, planetary gear mechanism, drive motor, automatic clutch, integrated starter-generator (abbreviated as ISG), engine , motor controller, battery management system, and power battery pack, in which: the engine is connected coaxially with the integrated starter generator, the integrated starter generator is connected with the active disc of the automatic clutch, the automatic clutch is connected through the drive motor and the planetary gear mechanism, and the planetary gear mechanism They are respectively connected to the driving motor and the main reducer-differential, the main reducer-differential is connected to the wheels through the drive axle, the power battery pack is connected to the motor controller and the external power plug through cables, and the motor controller is connected to the external power plug through cables. Connects with the integrated starter generator and drive motor. The outer ring gear of the planetary gear mechanism is fixedly connected with the vehicle frame. The motor controllers include drive motor controllers and integrated starter generator motor controllers.

The present invention only adds an automatic clutch on the basis of series hybrid power, which has the advantages of series hybrid power and reduces the power of the generator and drive motor at the same time; due to the relatively large battery capacity, the external charging function can meet low-speed driving conditions , so that fuel consumption and emissions can be reduced; the system structure is simple, avoiding the complicated transmission system, the automatic clutch is relatively mature, and the control requirements are low.

The structural innovation of the present invention lies in the application of the planetary gear mechanism as the transmission part between the driving motor and the final reducer-differential unit. The planetary gear mechanism has the advantages of compact structure, large transmission ratio, large bearing capacity and stable transmission. and high transmission efficiency, the double planetary gear mechanism here is used in conjunction with the integrated starter generator, automatic clutch and drive motor in the transmission system, which can simultaneously achieve the purpose of power splitting and speed change, and then can realize hybrid vehicle engine, motor Good matching and optimal control among the power battery pack.

In the present invention, a two-speed transmission mechanism can also be arranged between the planetary gear mechanism and the final reducer-differential joint mechanism. The existence of the two-speed transmission mechanism expands the speed change range, reduces the requirements for the speed range of the driving motor, and makes the speed change Control is more flexible.

The above-mentioned plug-in hybrid car drive system of the present invention includes the following multiple drive modes:

(1) Pure electric drive mode: When the vehicle is started or the vehicle is working with a low load and the SOC value of the battery is not low, the drive motor works alone, and the battery provides electric energy for the drive motor. The electric energy of the battery is used to drive the car, the engine and ISG are not involved in the work, and it is only driven by the drive motor;

(2) Series working mode: When the vehicle starts or the vehicle is under low load and the SOC value of the battery is low, the ISG starts the engine first, the clutch is disconnected, the engine generates electricity, and the drive motor drives the vehicle. The serial working mode generally works in the following situations:

a. Low-speed range, high-power driving conditions, such as continuous climbing, etc.;

b. The power of the battery is lower than the preset value, and it is necessary to replenish the power of the battery in time

(3) Parallel driving mode: When the vehicle demand power is greater than the engine efficiency optimization power and the battery SOC value is not low, the engine, drive motor and integrated starter generator jointly drive the vehicle after the clutch is engaged. This mode usually works in the middle and low speed acceleration and high speed areas;

(4) Engine alone drive mode: When the vehicle power demand is in the engine efficiency optimization area or the battery does not have enough power to supply the motor to work, the engine drives the vehicle alone, and the drive motor and integrated starter generator do not work;

(5) Engine driving driving power generation mode: When the vehicle is running, if the vehicle demand power is less than the engine efficiency optimization power and the battery SOC value is low, the engine will drive the vehicle, and the drive motor will work as a generator to absorb energy to the battery to adjust the engine power. Working efficiency and battery supplementary power, this mode generally works in the medium speed area (the engine power load is low and the efficiency is low);

(6) Brake power generation mode: when decelerating or coasting, the drive motor is used as a generator to absorb the kinetic energy of the vehicle to the battery;

(7) Parking charging mode: use the external power grid charging pile to charge the battery.

Compared with the existing hybrid hybrid vehicles, the present invention has the following remarkable effects: it can realize functions such as automatic start and stop of the engine, electric power assist and high-efficiency and high-power electric energy output, and at the same time, the engine and the integrated starter generator constitute a highly efficient vehicle-mounted The generator set keeps the engine always working at an optimal operating point with low fuel consumption and low emission or shuts down under low-speed following conditions of the vehicle (such as urban bus conditions), and the driving power of the whole vehicle is provided by a high-power drive motor. In high-speed driving conditions, the engine, drive motor and wheels are mechanically connected, and the power of the two can be transmitted to the wheels through the transmission system. The vehicle controller can determine the vehicle's state of charge according to the driver's behavior and the battery SOC (State Of Charge) value. Energy distribution to enable drive modes other than pure electric and series drive. This solution uses a large number of traditional car power systems, which can greatly reduce manufacturing costs.

Compared with the hybrid power system with variable speed system, the control of the present invention is simple, and the basic control strategy can be divided into four speed ranges, and the driving load of the drive motor and the engine varies in different ranges.

The invention realizes the purpose of power splitting and speed change, and further realizes the good matching and optimal control among the engine, the motor and the power battery pack, reduces the use cost of the vehicle, reduces the fuel cost, and reduces the impact on the petrochemical industry. Fuel dependence, reduced emissions of greenhouse gases and various harmful gases, while improving the efficiency of power grid generators. Adding a two-speed transmission mechanism not only expands the transmission range, but also reduces the requirements for the speed range of the drive motor, making the transmission control more flexible.

Description of drawings

Fig. 1 structural representation of Embodiment 1 of the present invention;

Fig. 2 is the energy transfer roadmap of the pure electric driving mode of Embodiment 1 of the present invention;

Fig. 3 is the energy transfer roadmap of the serial driving mode of Embodiment 1 of the present invention;

Fig. 4 is the energy transfer roadmap of the parallel drive mode of Embodiment 1 of the present invention;

Fig. 5 is the energy transfer roadmap of the single engine driving mode of Embodiment 1 of the present invention;

Fig. 6 is an energy transfer roadmap of engine driving and driving motor power generation mode in Embodiment 1 of the present invention;

Fig. 7 is the energy transfer route diagram of the braking power generation mode of Embodiment 1 of the present invention;

Fig. 8 is the energy transfer roadmap of the parking charging mode of Embodiment 1 of the present invention;

Figure 9 is a basic control strategy diagram of Embodiment 1 of the present invention;

Fig. 10 is a schematic structural diagram of Embodiment 2 of the present invention.

Detailed ways

The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

Example 1

As shown in Figure 1, the drive system of this embodiment includes an engine 1, an integrated starter generator ISG2, an automatic clutch 3, a drive motor 4, a planetary gear mechanism 5, wheels 6, a final reducer-differential 7, and a motor controller 8. Power battery pack 9, external plug 10, wherein: the engine 1 is coaxially connected with the integrated starter generator 2, the integrated starter generator 2 is connected with the driving disc of the automatic clutch 3, and the automatic clutch 3 passes through the driving motor 4 and the planetary gear mechanism 5 connection, the planetary gear mechanism 5 is connected with the drive motor 4 and the final drive-differential 7 respectively, the final drive-differential 7 is connected with the wheel 6 through the drive axle, and the power battery pack 9 is respectively connected with the motor controller 8 through cables It is connected with an external power plug 10, and the motor controller 8 is connected with the integrated starter generator 2 and the drive motor 4 through cables. The planetary gear mechanism 5 outer ring gears are fixedly connected with the vehicle frame. Wherein the motor controller 8 includes a drive motor controller and an integrated starter generator motor controller.

The engine 1 is used as a power unit, and its power can be directly transmitted to the wheels 6 through a mechanical system, or it can charge the power battery pack 9 in the form of electric energy through the integration of the starter generator 2 and the motor controller 8, or provide it directly to the drive motor controller 8 is used to supply power to the drive motor 4.

The integrated starter generator 2 is mainly used to use the electric energy of the power battery pack 9 to start the engine 1 and absorb the energy of the engine 1 to generate electricity. The drive motor 4 is used to drive the wheels 6 and recover the kinetic energy when the vehicle brakes.

The planetary gear mechanism 5 is used as the transmission part between the driving motor 4 and the final reducer-differential 7, and is used in combination with the integrated starter generator 2, automatic clutch 3 and driving motor 4 in the transmission system, which can simultaneously realize power splitting and The purpose of gear shifting is to achieve good matching and optimal control among the hybrid vehicle engine, electric motor, and power battery pack. The working process of the hybrid vehicle in various modes is introduced in Figures 2-7.

As shown in Figure 2, in the pure electric drive mode, the engine 1 stops, the power battery pack 9 supplies the drive motor 4 with energy, and the output energy of the drive motor 4 passes through the planetary gear mechanism 7 and the final reducer-differential 7 to the wheel6. Wherein, the electric energy of power battery pack 9 has three kinds of source channels:

1. The engine is directly supplied;

2. The external power supply is supplied through the external plug 10;

3. Braking energy feedback supply.

As shown in Figure 3, in the series drive mode, the output energy of the engine 1 is charged to the power battery pack 9 through the power generation of the integrated starter generator 2 or directly provided to the drive motor 4 without passing through the power battery pack 9, and the power battery pack 9 The energy is supplied to the driving motor 4, and the energy output from the driving motor 4 is transmitted to the wheels 6 through the planetary gear mechanism 5, the final reducer and the differential 7 in sequence.

As shown in Figure 4, in the parallel driving mode, the first energy transfer path is: the energy output by the engine 1 passes through the integrated starter generator 2, the clutch 3 and the drive motor 4; the second energy transfer path is: the battery pack 9 to the motor Controller 8, to driving motor 4 again. After the two strands of energy are coupled through the planetary gear mechanism 5, they are transmitted to the wheels 6 through the final drive and the differential 7.

As shown in FIG. 5 , in the engine-only drive mode, the energy output by the engine 1 is transmitted to the wheels 6 through the integrated starter generator 2 , the clutch 3 , the planetary gear mechanism 4 , the final reducer and the differential 7 in sequence. During this process, the rotors of the integrated starter generator 2 and the drive motor 4 are idling, and both do not perform work.

As shown in Figure 6, under the engine-driven, driving motor power generation mode, the energy from the engine 1 passes through the integrated starter generator 2 and the driven plate of the clutch 3, and then is divided into two paths through the driving motor 4 to generate power for the power battery pack 9 to charge and It is transmitted to the wheels 6 through the planetary gear mechanism 5 , the final reducer and the differential 7 .

As shown in Figure 7, in the braking energy feedback mode, the vehicle kinetic energy from the wheels 6 passes through the drive axle, the differential and the final drive 7, the planetary gear mechanism 5, the drive motor 4, and the motor controller 8 to the power battery pack 9 charge.

As shown in FIG. 8 , in the parking charging mode, the power battery pack 9 is charged through an external charging pile.

As shown in Figure 9, the basic control strategy can be divided into four speed ranges. In different ranges, the driving load of the drive motor and engine varies:

(1) Low-speed pure electric drive working mode

When the speed is lower than Ub, it is mainly driven by the drive motor 4, and only in the case of rapid acceleration, the engine 1 and ISG2 can directly participate in the drive when the value is about (Ub-20)km/h;

When the engine 1 does not participate in the direct drive, it needs to generate electricity according to a certain power according to certain working conditions;

(2) Medium-speed parallel drive

When the speed is higher than Ub and lower than Ua, the strategy of driving the motor 4 as the main drive and the engine 1 as the auxiliary joint drive is adopted;

(3) High speed engine drive

When the vehicle speed is higher than Ua, the engine 1 is mainly driven, and the drive motor 4 is driven or generated according to the actual needs of the working conditions, so as to adjust the overall efficiency of the engine 1 and supplement electric energy to the battery.

Example 2

As shown in Figure 10, this embodiment is an optimized solution, and on the basis of Embodiment 1, it also includes a two-speed transmission 11, and the two-speed transmission 11 is arranged between the planetary gear mechanism 5 and the final drive-differential 7 combined mechanism Between, the input shaft of the two-speed transmission 11 is connected with the planetary gear mechanism 5, and the output shaft of the two-speed transmission 11 is connected with the final drive-differential 7. Other component connections, working modes, and basic control strategies are the same as those in Embodiment 1, and will not be repeated here.

In this embodiment, due to the existence of the two-speed transmission mechanism, the speed change range is enlarged, and the requirement on the speed range of the driving motor is reduced, so that the speed change control is more flexible.

Claims (5)

1. plug-in type integrated actuating electric generator hybrid power car driving system, comprise: wheel, main reduction gear-diff, sun and planet gear, drive motor, self-acting clutch, integrated actuating electric generator, driving engine, electric machine controller, battery management system, power battery pack, it is characterized in that: driving engine is connected with integrated actuating electric generator is coaxial, integrated actuating electric generator is connected with the self-acting clutch driving disc spacing pressing, self-acting clutch is connected with sun and planet gear by drive motor, sun and planet gear is connected with main reduction gear-diff with drive motor respectively, main reduction gear-diff links to each other with wheel by drive axle, power battery pack is connected with external power supply plug with electric machine controller respectively by cable, electric machine controller is connected with drive motor with integrated actuating electric generator respectively by cable, the sun and planet gear external toothing is captiveed joint with vehicle frame, and wherein electric machine controller comprises drive motor controller and integrated actuating electric generator electric machine controller.

2. plug-in type integrated actuating electric generator hybrid power car driving system according to claim 1, it is characterized in that, a two-speed transmission is set between described sun and planet gear and the main reduction gear-diff, the two-speed transmission input shaft is connected with sun and planet gear, and output shaft is connected with main reduction gear-diff.

3. plug-in type integrated actuating electric generator hybrid power car driving system according to claim 1, it is characterized in that, described driving engine is as power unit, its power is directly passed to wheel by mechanical system, or charge to power battery pack in the mode of electric energy, or directly offer drive motor controller and be used for powering to drive motor by integrated actuating electric generator, electric machine controller.

4. plug-in type integrated actuating electric generator hybrid power car driving system according to claim 1 is characterized in that, described integrated actuating electric generator utilizes the electric energy fire an engine of battery and absorbs the energy generating of driving engine.

5. plug-in type integrated actuating electric generator hybrid power car driving system according to claim 1 is characterized in that, described drive motor is used for drive wheels and reclaim the kinetic energy of vehicle glancing impact.

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