CN201478863U - On-board auxiliary power for improved fuel efficiency and reduced emissions - Google Patents

Abstract

The on-board auxiliary power supply that can improve the fuel efficiency of the car and reduce exhaust emissions relates to an auxiliary power supply for hybrid electric vehicles based on waste heat and photovoltaic power generation. The output terminal of the roof solar panel (1) of the power supply is connected to the first Boost converter ( 8) The input terminals are connected; the first thermoelectric generator (2) is installed beside the radiator (4), and the output terminal of the first thermoelectric generator (2) is connected with the input terminal of the second Boost converter (9); the second thermoelectric generator (2) is connected to the input terminal of the second Boost converter (9). The electric appliance (3) is installed beside the exhaust pipe (6), and the output end of the second thermoelectric generator (3) is connected with the input end of the third Boost converter (10); in the energy regulation circuit (7), the first Boost converter (8) After the output terminal, the output terminal of the second Boost converter (9) and the output terminal of the third Boost converter (10) are connected in parallel, the electric energy is transmitted to the input terminal of the fourth Buck converter (11); the fourth Buck converter (11) The output terminal is connected with the positive pole of the storage battery (12).

Description

On-board auxiliary power for improved fuel efficiency and reduced emissions

technical field

The utility model relates to an auxiliary power supply device for a hybrid electric vehicle based on waste heat and photovoltaic power generation, which belongs to the field of vehicle power supplies.

Background technique

As the world's crude oil consumption continues to increase and environmental problems become increasingly prominent, energy saving and the development and utilization of renewable energy are showing a trend of accelerated development. Automobiles are currently the main product that consumes crude oil. With the rapid growth of the national economy, the number of automobiles in our country is also increasing rapidly. Only 25% of the combustion energy of a typical automotive internal combustion engine is used to drive the vehicle, and about 40% of the energy is wasted in the form of heat. According to the Seebeck effect, thermoelectric materials can directly convert thermal energy into electrical energy. On the other hand, solar energy has also been proposed to be applied to hybrid electric vehicles along with the promotion of the concept of renewable energy. Hybrid electric vehicle is a new type of vehicle that has emerged in recent years, and it uses a mechanical-electric hybrid power source. The on-board power supply can recover the energy when the whole vehicle brakes, and use this part of energy to drive the car, so it has higher fuel efficiency and lower emissions. In hybrid electric vehicles, the traditional on-board power supply is mainly composed of batteries and generators. When the engine is running normally (above idling speed), the engine drives the generator to run, and supplies power to all electrical equipment (except the starter), and at the same time supplies Battery charging. On the one hand, this auxiliary power supply needs to consume fuel; on the other hand, with the advancement of automobile technology, the increase of electrical equipment and electronic devices in modern automobiles, such as air conditioners, ABS, car phones, etc. Continue to increase, generator power increases with the increase of electrical equipment on the vehicle. At present, the generators on automobiles are all air-cooled generators. Under the limitation of the structure of the existing air-cooled generators, the increase of power will inevitably lead to the increase of generator volume, and the space for installing generators in automobiles is limited.

Therefore, there is an urgent need to develop a power supply that can meet the performance requirements of the vehicle and has energy-saving and environmental protection characteristics as an on-board power supply for hybrid electric vehicles.

Contents of the invention

Technical problem: The purpose of this utility model is to propose a vehicle-mounted auxiliary power supply that can improve the fuel efficiency of automobiles and reduce exhaust emissions, so as to overcome the shortage of existing vehicle-mounted power supplies, improve the fuel efficiency of automobiles and reduce exhaust emissions.

Technical solution: The utility model discloses a vehicle-mounted auxiliary power supply that can improve the fuel efficiency of automobiles and reduce exhaust emissions. The output end of the solar panel on the roof of the device is connected to the input end of the first Boost converter; the first thermoelectric generator is installed Next to the radiator, the output end of the first thermoelectric generator is connected to the input end of the second Boost converter; the second thermoelectric generator is installed next to the exhaust pipe, and the output end of the second thermoelectric generator is connected to the input end of the third Boost converter ; In the energy regulation circuit, after the output terminal of the first Boost converter, the output terminal of the second Boost converter and the output terminal of the third Boost converter are connected in parallel, the electric energy is transmitted to the input terminal of the fourth Buck converter; the output of the fourth Buck converter connected to the positive terminal of the battery.

The first inductance in the first Boost converter is connected in series with the first diode, and the first power switch is connected in parallel between the connection point of the first inductance and the first diode and the negative pole; The second inductor is connected in series with the second diode, and the second power switch is connected in parallel between the connection point of the second inductor and the second diode and the cathode; the third inductor of the third Boost converter is connected to the third diode The tubes are connected in series, and the third power switch is connected in parallel between the connection point of the third inductor and the third diode and the negative pole; the first stabilizing capacitor is connected in parallel between the output terminals of the three Boost converters and the negative pole.

The fourth power switch in the fourth Buck converter is connected in series with the fourth inductance, the fourth diode is connected in parallel between the connection point between the fourth power switch and the fourth inductance and the anode, and the output terminal is connected in parallel with the second regulator capacitance.

Beneficial effects: the utility model can improve the fuel efficiency of automobiles and reduce exhaust emissions, and the vehicle-mounted auxiliary power supply has the following advantages:

(1) Comprehensive utilization of energy, improved fuel efficiency and reduced emissions, energy saving and environmental protection.

(2) The excess energy generated by the new auxiliary power supply device can continuously supplement energy for the battery unit of the hybrid electric vehicle, thereby improving the utilization rate of the battery.

(3) Multiple input sources, non-rotating generators can improve the reliability, maintenance performance and system control flexibility of the power supply unit.

(4) The automobile generator can be canceled to improve the power layout of the hybrid electric vehicle.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Among them are: roof solar panel 1, first thermoelectric generator 2, second thermoelectric generator 3, radiator 4, engine 5, exhaust pipe 6, energy regulation circuit 7, first Boost converter 8, second Boost converter 9 , third Boost converter 10 , fourth Buck converter 11 , storage battery 12 .

Figure 2 is a circuit diagram of energy regulation.

Detailed ways

Below is the specific embodiment of the utility model to further describe:

In the vehicle-mounted auxiliary power supply that can improve the fuel efficiency of the car and reduce exhaust emissions, the energy regulation circuit is composed of a first Boost converter, a second Boost converter, a third Boost converter and a fourth Buck converter, and the energy regulation circuit And cooperate with the energy management strategy to control the above-mentioned converters. The thermoelectric generator uses the waste heat of the car to generate electricity, and the photovoltaic generator uses solar energy to generate electricity, which is then connected to the battery through an energy conditioning circuit.

Among them, there are two thermoelectric generators, which are respectively installed next to the engine exhaust pipe and radiator, and use the Seebeck effect of thermoelectric materials to directly convert heat energy into electrical energy. Convert solar energy into electrical energy by installing solar panels on the roof of the car. The energy regulation circuit connects multiple input power sources by multiple Boost converter circuits to charge the load or the storage battery.

The device consists of a solar panel, a thermoelectric generator, an energy regulating circuit and a storage battery. The output end of the roof solar panel 1 is connected to the input end of the first Boost converter 8; the first thermoelectric generator 2 is installed next to the radiator 4, and the output end of the first thermoelectric generator 2 is connected to the input end of the second Boost converter 9 ; The second thermoelectric generator 3 is installed beside the exhaust pipe 6, and the output end of the second thermoelectric generator 3 is connected with the input end of the third Boost converter 10; the output end of the first Boost converter 8 and the output of the second Boost converter 9 After connecting in parallel with the output terminal of the third Boost converter 10, the electric energy is transmitted to the input terminal of the Buck converter 11, and the output terminal of the fourth Buck converter 11 is connected with the storage battery 12.

In FIG. 1 , a roof solar cell panel 1 is installed on the roof to convert light energy into DC electric energy, and the output end of the solar cell panel 1 is connected to a first Boost converter 8 . The thermal energy of the radiator 4 is converted into DC electric energy after passing through the first thermoelectric generator 2 , and the output end of the first thermoelectric generator 2 is connected with the second Boost converter 9 . The thermal energy of the exhaust pipe 6 is converted into DC electric energy after passing through the second thermoelectric generator 3 , and the output end of the second thermoelectric generator 3 is connected with the third Boost converter 10 . The output terminal of the first Boost converter 8 , the output terminal of the second Boost converter 9 and the output terminal of the third Boost converter 10 are connected in parallel to transmit electric energy to the fourth Buck converter 11 . The first Boost converter 8, the second Boost converter 9, the third Boost converter 10, and the Buck converter 11 form a three-input two-stage Boost-Buck DC converter structure, and cooperate with the energy management strategy to control the power switches of each converter. The duty cycle of the device is controlled to form the energy regulation circuit 7 . The output end of the Buck converter 11 is connected to the storage battery 12 .

In Fig. 2, the energy regulation circuit 7 is composed of a first Boost converter 8, a second Boost converter 9, a third Boost converter 10 and a Buck converter 11, and the energy regulation circuit 7 cooperates with the energy management strategy to control the above-mentioned each converter. The first inductor L1 of the first Boost converter 8 is connected in series with the first diode D1, and the first power switch T1 is connected in parallel in the middle; the second inductor L2 of the second Boost converter 9 is connected in series with the second diode D2, and the second diode D2 is connected in parallel in the middle. The power switch T2; the third inductor L3 of the third Boost converter 10 is connected in series with the third diode D3, and the third power switch T3 is connected in parallel in the middle; the output terminals of the three Boost converters are connected in parallel with the first stabilizing capacitor C1. The fourth power switch T4 of the Buck converter 11 is connected in series with the fourth inductor L, the middle of the fourth diode D4 is connected in parallel, and the output terminal is connected in parallel with the second voltage stabilizing capacitor C2.

The roof solar cell panel adopted in the utility model can select the monocrystalline silicon cell panel of power 200W according to the size of the roof. The two thermoelectric generators can be composed of several flat or cylindrical thermoelectric modules according to the space of the engine and the exhaust pipe. Because the optimal performance of different thermoelectric materials is closely related to the operating temperature, the coolant inlet and outlet temperatures of the engine radiator are about 90°C and 120°C, respectively, while the temperature of the exhaust gas pipe varies from 200°C to 500°C, Therefore, the operating temperature of the thermoelectric module of the first thermoelectric generator is limited between 90°C and 120°C, and the operating temperature of the thermoelectric module of the second thermoelectric generator is limited between 200°C and 500°C. The power switching device can be an insulated gate bipolar transistor or a power field effect transistor or other power switching devices.

Combined with specific conditions, the device can be divided into the following two implementations:

Solution 1: Each power source supplies power to the load independently. At night, in rainy weather or in case of failure, if a generator stops working, the remaining generators can supply power to the load individually or simultaneously. The structure of multiple input sources greatly improves the reliability of power supply.

Solution 2: Multiple power sources supply power to the load at the same time. Under most normal working conditions, the device can realize multiple power sources supplying power to the load at the same time. In this way, waste heat and solar energy can be fully utilized to provide sufficient electric energy for the car, and the excess electric energy will be stored by charging the battery.

Claims (3)

1. the vehicle-mounted accessory power supply that can improve the fuel efficiency of automobile and reduce exhaust emissions is characterized in that roof solar panel (1) output of this device links to each other with Boost converter (a 8) input; It is other that first thermoelectric generator (2) is installed in radiator (4), and first thermoelectric generator (2) output links to each other with the 2nd Boost converter (9) input; It is other that second thermoelectric generator (3) is installed in blast pipe (6), and second thermoelectric generator (3) output links to each other with the 3rd Boost converter (10) input; In the energy conditioning circuit (7), after Boost converter (a 8) output, the 2nd Boost converter (9) output and the 3rd Boost converter (10) the output parallel connection, with electric energy transmitting to the four Buck converter (11) inputs; The 4th Buck converter (11) output links to each other with storage battery (12) is anodal.

2. the vehicle-mounted accessory power supply that improves the fuel efficiency of automobile and reduce exhaust emissions according to claim 1, it is characterized in that first inductance (L1) and first diode (D1) in the Boost converter (8) are connected in series, first power switch (T1) is connected in parallel between the tie point of first inductance (L1) and first diode (D1) and negative pole; Second inductance (L2) in the 2nd Boost converter (9) and second diode (D2) are connected in series, and second power switch (T2) is connected in parallel between the tie point of second inductance (L2) and second diode (D2) and negative pole; The 3rd inductance (L3) of the 3rd Boost converter (10) and the 3rd diode (D3) are connected in series, and the 3rd power switch (T3) is connected in parallel between the tie point of the 3rd inductance (L3) and the 3rd diode (D3) and negative pole; First electric capacity of voltage regulation in parallel (C1) between three Boost converter output terminals and the negative pole.

3. the vehicle-mounted accessory power supply that improves the fuel efficiency of automobile and reduce exhaust emissions according to claim 1, it is characterized in that the 4th power switch (T4) in the 4th Buck converter (11) is connected in series with the 4th inductance (L4), the 4th diode in parallel (D4) between tie point between the 4th power switch (T4) and the 4th inductance (L4) and the positive pole, output second electric capacity of voltage regulation (C2) in parallel.

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