CN114750611A - Range extender and method for improving efficiency by reducing air pressure of generator - Google Patents

Range extender and method for improving efficiency by reducing air pressure of generator Download PDF

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Publication number
CN114750611A
CN114750611A CN202210650122.XA CN202210650122A CN114750611A CN 114750611 A CN114750611 A CN 114750611A CN 202210650122 A CN202210650122 A CN 202210650122A CN 114750611 A CN114750611 A CN 114750611A
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China
Prior art keywords
generator
air
engine
air inlet
air pressure
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Pending
Application number
CN202210650122.XA
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Chinese (zh)
Inventor
卡雷尔·范·奥斯肖特
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Getec Vehicle Technology Suzhou Co ltd
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Getec Vehicle Technology Suzhou Co ltd
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Priority to CN202210650122.XA priority Critical patent/CN114750611A/en
Publication of CN114750611A publication Critical patent/CN114750611A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • B60L50/62—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles charged by low-power generators primarily intended to support the batteries, e.g. range extenders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/06—Arrangement in connection with cooling of propulsion units with air cooling

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention discloses a range extender and a method for improving efficiency by reducing air pressure of a generator, wherein the range extender comprises an engine-generator system, the engine comprises a piston chamber, an air inlet manifold and an engine output shaft, the air inlet side of the air inlet manifold is provided with a throttle valve, the generator comprises a generator housing, a stator part and a rotor part, the stator part and the rotor part are arranged in the generator housing, the rotor part is connected with the engine output shaft in a matching mode and receives rotating power of the engine output shaft, the range extender is further provided with an air pipe, the air pipe is communicated with the air inlet manifold and the generator, the first end of the air pipe is positioned on the air inlet manifold and is arranged between the throttle valve and the piston chamber, and the second end of the air pipe extends into the generator housing. The present invention utilizes the manifold air pressure of the engine to reduce the air pressure in the generator to increase the efficiency of the engine-generator system.

Description

Range extender and method for improving efficiency by reducing air pressure of generator
Technical Field
The invention relates to the technical field of range-extended electric automobiles, in particular to a range extender of an electric automobile, and especially relates to a range extender and a method for improving efficiency by reducing air pressure of a generator.
Background
In extended range electric vehicles (REEVs), the engine powers a generator, which in turn charges a battery to increase range. The amount of fuel required for each charge depends in part on the efficiency of the engine-generator system, which is influenced by a number of factors, part of which is due to the windage losses inside the generator as a result of internal air friction on the rotating parts of the generator, which friction is proportional to the air pressure in the generator.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a range extender and a method for improving the efficiency by reducing the air pressure of a generator.
The purpose of the invention is realized by the following technical scheme:
a range extender for improving efficiency by reducing air pressure of a generator comprises an engine-generator system, the engine-generator system is a relatively fixed engine and a generator, the engine comprises a piston chamber and a piston reciprocating in the piston chamber, an air inlet manifold ventilating the piston chamber, and an engine output shaft, the air inlet of the air inlet manifold is provided with a throttle valve, the generator comprises a generator shell, a stator part and a rotor part, the stator part and the rotor part are arranged in the generator shell, the rotor part is connected with the output shaft of the engine in a matching way and receives the rotating power, and is also provided with an air pipe, the air pipe intercommunication air intake manifold with the generator, the first end of air pipe is located air intake manifold is last and set up in the choke valve with between the piston chamber, the second end of air pipe stretch into in the generator casing.
Preferably, the air pressure of the intake manifold is between 0bar and 1bar absolute.
Preferably, the second end of the air tube is aligned with the opposite faces of the stator and rotor portions.
Preferably, the air inlet of the ventilation pipe is communicated with the air inlet manifold and arranged between the throttle valve and the air inlet.
Preferably, the air pipe and the connecting channel of the ventilation pipe on the generator shell are symmetrically arranged.
Preferably, the ventilation tube is opposite to the air flow in the air tube.
The invention also discloses a method for improving efficiency by reducing air pressure of a generator, which comprises the following steps:
step 1, configuring an air pipe in an engine-generator system, wherein the engine-generator system is a relatively fixed engine and a generator, the engine comprises a piston chamber, a piston, an air inlet manifold and an engine output shaft, the piston chamber is located in the piston chamber and can reciprocate, the air inlet manifold is ventilated into the piston chamber, the air inlet of the air inlet manifold is provided with a throttle valve, the generator comprises a generator housing, a stator part and a rotor part, the stator part and the rotor part are arranged in the generator housing, the rotor part is connected with the engine output shaft in a matching mode and receives rotating power, the air pipe is communicated with the air inlet manifold and the generator, the first end of the air pipe is located on the air inlet manifold and is arranged between the throttle valve and the piston chamber, and the second end of the air pipe extends into the generator housing;
and 2, controlling the absolute value of the air pressure of the air inlet manifold to be 0bar-1 bar.
The invention has the following beneficial effects: reducing air pressure in the generator using manifold air pressure of the engine to increase efficiency of the engine-generator system; the ventilation duct is configured to supply fresh air to areas requiring more cooling.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
FIG. 1: a schematic diagram of an embodiment of the invention;
FIG. 2: a linear comparison of cooling demand to system power for an engine-generator system.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.
In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in figure 1, the invention discloses a range extender for improving efficiency by reducing air pressure of a generator, which comprises an engine-generator system, wherein the engine-generator system comprises a relatively fixed engine 1 and a generator 2, the engine 1 comprises a piston chamber 11 and a piston 15 which reciprocates in the piston chamber, an air inlet manifold 12 for ventilating into the piston chamber 11 and an engine output shaft 13, and an air inlet 10 of the air inlet manifold 12 is provided with a throttle valve 14. For clarity of illustration, only one piston chamber 11 and piston 15 reciprocating therein are shown. As is well known to those skilled in the art, the engine-generator system may have a plurality of piston chambers 11.
The generator 2 includes a generator housing 20, a stator portion 21 disposed inside the generator housing 20, and a rotor portion 22, and the rotor portion 22 is coupled to the engine output shaft 13 and receives rotational power. The arrangement and the working principle of the structures are completely the same as those of the prior art, and are not described in detail herein.
The present invention improves the principle of using engine manifold air pressure to reduce the air pressure inside the generator, which in turn reduces windage losses inside the generator, thereby increasing the efficiency of the engine-generator system.
In the present invention, the intake manifold 12 of the engine and the generator case 20 are connected by the air pipe 3. In the preferred embodiment, the first end of the air tube 3 is located on the intake manifold and is disposed between the throttle valve 14 and the piston chamber 11, which reduces the air pressure between the throttle valve and the engine piston chamber. The second end of the air tube extends into the generator housing 20.
Through this air duct 3 the air pressure in the generator 2 will be equal to the air pressure in the intake manifold 12. At part-load (between idle and full power) conditions, the absolute value of the air pressure in the intake manifold 12 is between 0bar and 1bar, depending on the load. Thus, the internal pressure of the generator becomes small (less than atmospheric pressure), the internal windage loss thereof is reduced, and the efficiency of the engine-generator system is improved because the windage loss is proportional to the air pressure.
The invention also has better effect on cooling the engine-generator system.
The air inside the generator 2 transfers heat from the rotor parts (rotor and windings) to the cooling system. As the current increases, the cooling requirement increases as the generator load increases. As the power of the engine and generator increases, the current also increases. These currents heat the conductors that need to be cooled. As can be seen from fig. 2, the increase in cooling demand is the same as the increase in system power.
As is well known to those skilled in the art, air pressure in the intake manifold 12 is used to regulate engine torque. With reference to the following table, when the air pressure of the intake manifold 12 is low, the output torque is low; when the air pressure of the intake manifold 12 is high, the output torque is high. By using the technical scheme of the invention, the air pressure in the generator 2 can be changed along with the change of the engine load. This means that cooling can be performed when required and efficiency increased where possible.
Figure 180615DEST_PATH_IMAGE001
For better cooling, in the preferred embodiment, the second end of the air tube is aligned with the opposite faces of the stator and rotor portions 21, 22.
To further improve the cooling of areas with higher cooling requirements, ventilation ducts 4 may also be added in the preferred embodiment. The outlet of the ventilation duct 4 extends into the generator housing 20, by which fresh air is supplied to areas that require more cooling. Of course, the areas where more cooling is needed may be determined based on the engine-generator system specifics.
The intake of the ventilation duct 4 communicates with the intake manifold 12 and is arranged between the throttle valve 14 and the intake 10. The throttle valve 14 has atmospheric pressure on the intake side, in such a way that the pressure difference over the valve is used to generate an air flow. The air pipe 3 and the ventilation pipe 4 are symmetrically arranged on a connecting channel of the generator housing 20. The ventilation tube 4 is opposite to the air flow direction in the air tube 3.
The invention also discloses a method for improving efficiency by reducing the air pressure of the generator, which comprises the following steps:
step 1, an air pipe 3 is configured in an engine-generator system, the engine-generator system is an engine 1 and a generator 2 which are relatively fixed, the engine 1 comprises a piston chamber 11 and a piston 15 reciprocating therein, an intake manifold 12 venting into the piston chamber 11, an engine output shaft 13, the air intake 10 of the intake manifold 12 is provided with a throttle valve 14, the generator 2 comprises a generator housing 20, a stator part 21 and a rotor part 22 arranged within the generator housing 20, the rotor part 22 is coupled to the engine output shaft 13 and receives rotational power, the air pipe 3 communicates the intake manifold 12 with the generator 2, a first end of the air pipe 3 is positioned on the intake manifold and is arranged between the throttle valve 14 and the piston chamber 11, and a second end of the air pipe extends into the generator housing 20;
and 2, controlling the absolute value of the air pressure of the intake manifold 12 to be 0bar-1 bar.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is merely a detailed description of possible embodiments of the present invention, and it is not intended to limit the scope of the invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. A range extender for improving efficiency by reducing air pressure of a generator, comprising an engine-generator system, wherein the engine-generator system comprises an engine (1) and a generator (2) which are fixed relatively, the engine (1) comprises a piston chamber (11) and a piston (15) which reciprocates in the piston chamber, an air inlet manifold (12) for ventilating air into the piston chamber (11), and an engine output shaft (13), an air inlet (10) of the air inlet manifold (12) is provided with a throttle valve (14), the generator (2) comprises a generator housing (20), a stator part (21) arranged in the generator housing (20) and a rotor part (22), and the rotor part (22) is coupled with the engine output shaft (13) and receives rotary power, and is characterized in that: still be configured with an air pipe (3), air pipe (3) intercommunication air intake manifold (12) with generator (2), the first end of air pipe (3) is located air intake manifold is last and set up in throttle valve (14) with between piston chamber (11), the second end of air pipe stretch into in generator housing (20).
2. The range extender utilizing reduced generator air pressure to improve efficiency of claim 1, wherein: the absolute value of the air pressure of the intake manifold (12) is between 0bar and 1 bar.
3. The range extender utilizing reduced generator air pressure to improve efficiency of claim 1, wherein: the second end of the air tube is aligned with the opposite faces of the stator portion (21) and rotor portion (22).
4. The range extender utilizing reduced generator air pressure to improve efficiency of claim 1, wherein: and the air outlet of the ventilation pipe (4) extends into the generator shell (20), and the air inlet of the ventilation pipe (4) is communicated with the air inlet manifold (12) and arranged between the throttle valve (14) and the air inlet (10).
5. The range extender utilizing reduced generator air pressure to improve efficiency according to claim 4, wherein: the air pipe (3) and the ventilation pipe (4) are symmetrically arranged on a connecting channel on the generator shell (20).
6. The range extender utilizing reduced generator air pressure to improve efficiency according to claim 5, wherein: the air flow direction in the ventilation pipe (4) is opposite to that in the air pipe (3).
7. A method for increasing efficiency by reducing generator air pressure, comprising: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
step 1, configuring an air pipe (3) in an engine-generator system, wherein the engine-generator system comprises an engine (1) and a generator (2) which are relatively fixed, the engine (1) comprises a piston chamber (11) and a piston (15) which is positioned in the piston chamber for reciprocating motion, an air inlet manifold (12) which is ventilated into the piston chamber (11), and an engine output shaft (13), an air inlet (10) of the air inlet manifold (12) is provided with a throttle valve (14), the generator (2) comprises a generator housing (20), a stator part (21) and a rotor part (22) which are arranged in the generator housing (20), the rotor part (22) is matched and connected with the engine output shaft (13) to rotate, and the air pipe (3) receives rotary power which is communicated with the air inlet manifold (12) and the generator (2), a first end of the air pipe (3) is located on the intake manifold and is arranged between the throttle valve (14) and the piston chamber (11), and a second end of the air pipe extends into the generator housing (20);
and 2, controlling the absolute value of the air pressure of the intake manifold (12) to be 0bar-1 bar.
CN202210650122.XA 2022-06-10 2022-06-10 Range extender and method for improving efficiency by reducing air pressure of generator Pending CN114750611A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6823840B1 (en) * 2003-08-21 2004-11-30 General Motors Corporation Manifold absolute pressure control system and method for a hybrid electric vehicle
CN105545411A (en) * 2014-10-28 2016-05-04 福特环球技术公司 Crankcase ventilation for turbocharged engine
CN107044367A (en) * 2016-01-22 2017-08-15 株式会社日气 The fuel supply system of V-type twin cylinder formula general purpose engine
CN108699962A (en) * 2016-02-08 2018-10-23 雷诺股份公司 Air pressurizer for internal combustion engine
CN109515215A (en) * 2018-11-09 2019-03-26 广西玉柴机器股份有限公司 Range extender system
CN112550003A (en) * 2020-12-01 2021-03-26 武汉理工大学 Range extender for electric automobile
CN113982804A (en) * 2021-11-15 2022-01-28 中国第一汽车股份有限公司 Start-up system and control method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6823840B1 (en) * 2003-08-21 2004-11-30 General Motors Corporation Manifold absolute pressure control system and method for a hybrid electric vehicle
CN105545411A (en) * 2014-10-28 2016-05-04 福特环球技术公司 Crankcase ventilation for turbocharged engine
CN107044367A (en) * 2016-01-22 2017-08-15 株式会社日气 The fuel supply system of V-type twin cylinder formula general purpose engine
CN108699962A (en) * 2016-02-08 2018-10-23 雷诺股份公司 Air pressurizer for internal combustion engine
CN109515215A (en) * 2018-11-09 2019-03-26 广西玉柴机器股份有限公司 Range extender system
CN112550003A (en) * 2020-12-01 2021-03-26 武汉理工大学 Range extender for electric automobile
CN113982804A (en) * 2021-11-15 2022-01-28 中国第一汽车股份有限公司 Start-up system and control method

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Application publication date: 20220715