CN217197763U

CN217197763U - Range extending system of hybrid vehicle

Info

Publication number: CN217197763U
Application number: CN202221168531.8U
Authority: CN
Inventors: 张兴林
Original assignee: Getec Vehicle Technology Suzhou Co ltd
Current assignee: Getec Vehicle Technology Suzhou Co ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2022-08-16
Anticipated expiration: 2032-05-16

Abstract

The utility model discloses a hybrid vehicle's range extending system. The range extending system comprises an engine, a first generator, a second generator and a control unit. The engine has a crankshaft. The first generator has a first rotor shaft directly connected to the power take-off of the crankshaft. The second generator has a second rotor shaft that is directly connected to the power take-off of the crankshaft. The control unit selectively activates at least one of the first generator and the second generator to generate electricity to charge a power battery or directly drive a motor to operate, according to an output power demand of the hybrid vehicle. The utility model discloses a hybrid vehicle's the system of increasing journey can drive different generators according to the different power demands of vehicle and carry out work, reduces the capacity demand to power battery, and has realized the stack between the high efficiency region of two generators.

Description

Range extending system of hybrid vehicle

Technical Field

The utility model relates to a new forms of energy vehicle especially relates to a system of increasing journey of vehicle.

Background

Along with the increase of national requirements on energy conservation and emission reduction of carbon neutralization, commercial vehicles and engineering vehicles also need to be optimized in energy conservation to the greatest extent. At present, two main routes for energy conservation and emission reduction of vehicles are provided, wherein one route is a pure electric scheme, and the other route is a hybrid scheme. Because commercial car and machineshop car have high continuation of the journey, high-power demand, use pure electric scheme cost too big and time cost is also very big, so the hybrid scheme is the preferred scheme comparatively to commercial car and machineshop car at present stage.

The extended range electric vehicle has some differences from the conventional hybrid electric vehicle. Although the extended range electric vehicle also has an engine, the engine does not directly drive the vehicle in a normal condition, and only drives the generator to generate electricity. The electric power generated by the generator is directly supplied to the motor, and the surplus electric power can be supplied to the battery for charging, so that the vehicle can be driven to move by the motor.

A conventional vehicle equipped with a range extending system generally has only one generator. Since the engineering truck drives additional functional requirements (such as lifting the carriage, hoisting and the like), different power requirements are required for the driving system, which means that a large-power and large-torque generator is required. If a single generator is used, under the requirements of high power and high torque, the corresponding requirements are that the size of a generator control unit is increased by multiple times and a large-capacity battery is required, so that the cost of the automobile and the occupied volume of parts are greatly increased.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hybrid vehicle's range extending system, it can select the different mode of generator according to the power demand of vehicle.

In order to achieve the above object, the present invention provides a hybrid vehicle's range extending system, which includes an engine, a first generator, a second generator and a control unit. The engine has a crankshaft. The first generator has a first rotor shaft directly connected to the power take-off of the crankshaft. The second generator has a second rotor shaft that is directly connected to the power take-off of the crankshaft. The control unit selectively activates at least one of the first generator and the second generator to generate electricity to charge a power battery or directly drive a motor to operate, according to an output power demand of the hybrid vehicle.

In one or more embodiments, the first generator includes a first rotor, a first rotor support disposed within the first rotor, and the first rotor shaft disposed on the first rotor support, and the second generator includes a second rotor, a second rotor support disposed within the second rotor, and the second rotor shaft disposed on the second rotor support.

In one or more embodiments, the first generator and the second generator are the same size.

In one or more embodiments, the range extended system further comprises a first generator controller connected to the first generator and a second generator controller connected to the second generator. The control unit controls the first generator controller and the second generator controller to work. The first generator controller and the second generator controller can respectively control the work of the first generator and the second generator, such as opening, closing, rotor rotating speed and the like according to the control signal received by the control unit.

In one or more embodiments, the range extension system further includes a clutch through which the power output of the crankshaft transfers power to the wheels of the hybrid vehicle.

Compared with the prior art, according to the utility model discloses a hybrid vehicle's range system that increases through setting up two generators for can select the different mode of two generators according to the power demand of vehicle. Especially under high power requirement, the high-efficiency area of the double motor is larger than that of the single motor by matching the two generators, and the selectable operation modes are increased. The size of the generator controller and the volume and capacity of the power battery are reduced, the design space and the weight of the whole machine are greatly saved, and energy conservation and emission reduction are facilitated.

Drawings

Fig. 1 is a schematic diagram of a range extending system of a hybrid vehicle according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a range extending system of a hybrid vehicle according to another embodiment of the present invention.

Fig. 3 is a map of the rotor speed and torque of the generator.

Description of the main reference numerals:

1-engine, 2-first generator, 21-first rotor shaft, 3-second generator, 31-second rotor shaft, 4-clutch.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As described above, in one embodiment of the present invention, the range extending system operates in such a manner that the engine does not directly participate in the operation of the directly driven wheels, the output torque of the engine is transmitted to the generator, and the generator transmits the electric power to the battery to charge the battery or directly transmits the electric power to the motor. The output torque of the electric motor is transmitted to the wheels through a gear mechanism or the like, so that the vehicle runs.

As shown in fig. 1, a range extending system of a hybrid vehicle according to an embodiment of the present invention includes an engine 1, a first generator 2, a second generator 3, and a control unit. The engine 1 has a crankshaft. The first generator 2 has a first rotor shaft 21, which first rotor shaft 21 is directly connected to the power take-off 11 of the crankshaft. The second generator 3 has a second rotor shaft 31, which second rotor shaft 31 is directly connected to the power take-off 11 of the crankshaft. The control unit selectively activates at least one of the first generator 2 and the second generator 3 to generate electricity to charge the power battery or directly drive the motor to operate (e.g., in the case of power shortage of the power battery) according to the output power demand of the hybrid vehicle.

It is known in the art that if the power of a single generator is to be increased, large voltages or IGBT components need to be added to the generator controller, so that the size of the generator controller needs to be increased by tens of times. And the high power requires a great increase in the voltage of the battery, so that the capacity and volume of the power battery need to be increased. In comparison, two low-power generators are arranged and work in parallel (the output power is in series connection) under the conventional battery voltage (for example, 315V-370V), the size of a controller does not need to be changed, and the battery voltage can be kept unchanged, so that the battery volume does not need to be increased, the weight of the whole vehicle can be greatly saved, and the battery capacity does not need to be greatly improved.

In an embodiment, the first generator 2 comprises a first rotor 22, a first rotor support 23 arranged in the first rotor 22 and a first rotor shaft 21 arranged on the first rotor support. The second generator 3 comprises a second rotor 32, a second rotor support 33 arranged in the second rotor 32 and the second rotor shaft 31 arranged on the second rotor support 33.

In this context, direct connection means that the power take-off 11 of the crankshaft of the engine 1 is directly connected to the rotor shafts of the first generator 2 and the second generator 3, for example by a flange-type hard connection or by a threaded socket, for example, the power take-off 11 has an external thread and the first rotor shaft 21 and the second rotor shaft 31 have an internal thread. This manner of direct connection is different from the prior art flexible connectors that are connected by splines as the connecting member. Because the power output end of the crankshaft of the engine is directly connected with the rotor shaft of the generator, the kinetic energy output by the engine 1 is directly transmitted to the rotor of the generator, the rotor serves as an engine flywheel, different rotary inertia is provided by means of a rotor support, and therefore the engine flywheel is omitted. The rotor of the first generator 2 and/or the second generator 3 functions as a flywheel, which reduces the volume and synchronizes the engine speed and the generator speed so that both the engine and the generator operate in an optimal high efficiency zone.

In an embodiment, only one of the first generator 2 and the second generator 3 is operated under low power demand, e.g. only the first generator 2 is selected to be operated. At medium power demand, the generators operate within a range of intervals, the lower limit of which is two-thirds full power of one of the generators in the high-efficiency zone, and the upper limit of which is "two-thirds full power of the first generator in the high-efficiency zone + two-thirds full power of the high-efficiency zone of the second generator". Under high power requirements, the first generator and the second generator both operate at full power in the high efficiency region. The motor controller works in the mode, so that each motor is ensured not to work at high power for a long time, the service lives of the motor and the motor controller are prolonged, smooth transition of power is realized, and the motor controller is easier to control and has no blockage.

Preferably, the first generator 2 and the second generator 3 are of the same size, which results in the high efficiency operating areas of both generators being in the same range. For example, first rotor shaft 21 and second rotor shaft 31 both rotate at a speed of 2000rpm to 4800 rpm. Normally, the optimum state of the engine is 2200 to 3500rpm, which is the most economical and best working range of the engine. Referring to fig. 3, the utility model discloses the rotational speed of generator is between 2000rpm ~ 4800rpm, and battery voltage is between 315V ~ 370V, covers the bent axle rotational speed range of the high-efficient workspace of engine 1 just for engine work efficiency maximize, and make the torque range maximize of the high-efficient workspace of generator.

According to the utility model discloses an embodiment's range extending system can also include the first generator controller of being connected with first generator 2 and the second generator controller of being connected with second generator 3. Compared with a single generator with the same power size as the sum of the maximum powers of the two generators, the size of the two generator controllers can be greatly reduced, and space and cost are saved.

As shown in fig. 2, in another embodiment of the present invention, the same components and connections are used as in the embodiment shown in fig. 1. The range extension system may also include a clutch 4. The clutch 4 in one embodiment, in case of a vehicle equipped with the clutch 4, if only one generator is operated, the power take-off can be separated from the rotor shaft of the other generator by the clutch 4, avoiding energy losses and physical wear. For example, in a state where the first generator 2 is operated, the power output end 11 is disconnected from the second rotor shaft 31 by the clutch 4, so that the second generator 3 is completely disconnected from the power output end, and abrasion caused by direct connection between the two is avoided.

According to the utility model discloses an increase journey system can carry on commercial car or engineering vehicle. Commercial and construction vehicles often have high power requirements and do not need to be oversized based on extended range battery capacity, the required high power generator is divided into two, so that a common base battery can be used, and the requirements on the battery and a generator control unit are reduced. In addition, the high-efficiency area of the double-generator is larger than that of the single-generator through the matching of the two generators, the capacity of the generators is reduced, the design space and the weight of the whole generator are greatly saved, and the energy conservation and emission reduction are facilitated.

In an embodiment, in the case where the vehicle is equipped with the clutch 4, the control method further includes: if only one generator is operated, the power take-off can be separated from the rotor shaft of the other generator by means of the clutch 4, avoiding energy losses and physical wear. For example, in a state where the first generator 2 is operating, the power output end 11 is disconnected from the second rotor shaft 31 by the clutch 4, so that the second generator 3 is completely deactivated, and abrasion caused by direct connection between the two is avoided.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A range extending system of a hybrid vehicle, comprising:

an engine having a crankshaft;

a first generator having a first rotor shaft directly connected to a power output end of the crankshaft;

a second generator having a second rotor shaft directly connected to the power take-off of the crankshaft; and

a control unit that selectively activates at least one of the first generator and the second generator to generate electricity in accordance with an output power demand of the hybrid vehicle.

2. The hybrid vehicle range extension system of claim 1, wherein the first generator includes a first rotor, a first rotor support disposed within the first rotor, and the first rotor shaft disposed on the first rotor support, and wherein the second generator includes a second rotor, a second rotor support disposed within the second rotor, and the second rotor shaft disposed on the second rotor support.

3. The hybrid vehicle range extension system of claim 2, wherein the power output has external threads and the first and second rotor shafts have internal threads, the power output being directly connected to the first and second rotor shafts by a threaded engagement.

4. The hybrid vehicle range extension system of claim 1, wherein the first and second generators are of the same size.

5. The hybrid vehicle range extension system of claim 1, further comprising a first generator controller coupled to the first generator and a second generator controller coupled to the second generator, the control unit controlling the first generator controller and the second generator controller to operate.

6. The hybrid vehicle range extension system of claim 1, further comprising a clutch through which the power output of the crankshaft is disengaged and engaged with the first or second rotor shaft.