CN112937289B - Device for utilizing automobile windward resistance to change power - Google Patents

Abstract

The invention discloses a device for utilizing the variable power of windward resistance of an automobile, which mainly relates to the technical field of vehicle engineering; comprising the following steps: a vehicle speed sensor; an ECU; the front end of the automobile is provided with a front air inlet communicated with the front air channel, a front air inlet grille is arranged in the front air inlet, the bottom of the automobile is provided with a front air outlet communicated with the front air channel, a front air outlet grille is arranged in the front air outlet, and a front fan is arranged in the front air channel; a generator; the top of the automobile is provided with a rear air inlet communicated with the rear air channel, a rear air inlet grille is arranged in the rear air inlet, the rear end of the automobile is provided with a rear air outlet communicated with the rear air channel, a rear air outlet grille is arranged in the rear air outlet, and a rear fan is arranged in the rear air channel; a motor; a transformer; the invention can convert part of head-on airflow energy in the running process of the automobile into the kinetic energy of the automobile, reduces wind resistance, improves a negative pressure area in high-speed running, and can improve the utilization rate of energy.

Description

The Utilization Device of Automobile Winding Resistance Variation Power

technical field

The invention relates to the technical field of vehicle engineering, in particular to a device for utilizing variable force of wind resistance of an automobile.

Background technique

The driving resistance of a car is composed of mechanical resistance and air resistance. The resistance composition of a car is not static when it is running. When a car is running at a low speed, it is mainly mechanical resistance, and when the car is running at a high speed, the proportion of air resistance is greatly increased. For example , when the car is running at a speed of 90km/h, the air resistance accounts for about 55% of the total driving resistance, that is, 55% of the total power emitted by the engine is consumed by the air resistance. Therefore, when the car is running, the oncoming airflow energy The recovery of energy will greatly improve the utilization rate of energy, and most of the existing energy recovery devices for the oncoming airflow on some running vehicles are in the form of wind turbines, which convert the windward resistance into electrical energy and store it for secondary use. It is often impossible to directly convert the energy of the oncoming airflow into the kinetic energy of the vehicle, resulting in a certain amount of energy loss.

Contents of the invention

The purpose of the present invention is to solve the problems existing in the prior art, to provide a device for utilizing the variable power of the wind resistance of the automobile, which can convert a part of the energy of the oncoming airflow during the running of the automobile into the kinetic energy of the automobile, thereby reducing the wind resistance and improving high-speed driving The negative pressure zone can reduce the energy consumption of the vehicle and improve the utilization rate of energy.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

A device for utilizing wind resistance variable force of automobiles, including:

A vehicle speed sensor, the vehicle speed sensor is installed at the wheel of the vehicle for measuring the vehicle speed of the vehicle;

ECU;

The front air duct, the front air duct is located at the front end of the car body of the car, the front end of the car is provided with a front air intake connected to the front air duct, the front air intake is provided with a front air intake grille, and the bottom of the car is provided with a front air intake. There is a front exhaust port connected with the front air channel, the front exhaust port is provided with a front exhaust grille, and the front air channel is provided with a front fan;

A generator, the generator is installed in the car body of the car, and the rotor of the generator is connected to the front fan by transmission;

The rear air duct, the rear air duct is located at the rear end of the car body of the car, the top of the car is provided with a rear air intake connected to the rear air duct, and the rear air intake is provided with a rear air intake grille. The rear end is provided with a rear exhaust port communicating with the rear air duct, the rear exhaust port is provided with a rear exhaust grille, and the rear air duct is provided with a rear fan;

An electric motor, the electric motor is installed in the car body of the automobile, and the rotating shaft of the electric motor is connected to the rear fan through transmission;

A transformer, the input end of the transformer is connected to the generator, and the output end is connected to the motor;

The vehicle speed sensor, the front air intake grill, the front exhaust grill, the rear air intake grill, the rear exhaust grill, the generator, the transformer, and the electric motor are all connected with the ECU signal.

Preferably, both the front air intake grille and the rear air intake grille are active air intake grilles, and the front exhaust grille and the rear exhaust grille are both active air exhaust grilles.

Preferably, the transformer includes a closed iron core, the closed iron core is provided with a fixed coil winding connected to the generator, and a variable coil winding connected to the motor, and the variable coil winding is provided with a sliding contact, The sliding contact is connected with a control motor for adjusting the position of the sliding contact, and the control motor is connected with the ECU for signals.

Preferably, both the generator and the motor are provided with speed sensors, and the speed sensors are connected to the ECU for signals.

Preferably, the output end of the transformer is connected to a rectifier, the rectifier is connected to a storage battery, and the ECU is connected to a brake pedal sensor.

Preferably, both the front fan and the rear fan are vertical-axis fans.

Compared with the prior art, the beneficial effects of the present invention are:

1. The vehicle speed sensor of the present invention is used to measure the vehicle speed of the automobile and send the measurement result to the ECU, and the ECU judges whether the vehicle speed reaches the opening condition of the present invention. For example, the opening condition can be set as the vehicle speed reaches 90km/h and above; when When the ECU judges that the speed of the vehicle reaches the opening condition of the present invention, the ECU controls to open the front air intake grill, the front exhaust grill, the rear air intake grill, and the rear exhaust grill. Electric energy is generated, and the electric motor turns the electric energy into the rotational kinetic energy of the rear fan. As the rear fan rotates, the airflow flows from the rear air intake grille into the rear air duct, and then flows out from the rear exhaust grille, generating backward thrust, which can complete the Vehicles at a constant speed and acceleration at high speed recover the wind resistance, and convert a part of the energy of the oncoming airflow during the driving process into the kinetic energy of the car, which reduces the wind resistance, improves the negative pressure area when driving at high speed, and can reduce the energy consumption of the car , Improve energy utilization.

2. The present invention can shorten the braking distance when the car brakes, and recover the braking energy. The brake pedal sensor detects the position of the brake pedal and sends the detection result to the ECU. The ECU judges whether the brake pedal is stepped on. If it is stepped on, it will be closed. The electric energy generated by the rear intake grille, rear exhaust grille, electric motor and generator is stored in the battery.

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention;

Accompanying drawing 2 is the control schematic diagram of ECU of the present invention;

Accompanying drawing 3 is the control flowchart of the present invention;

Accompanying drawing 4 is the schematic diagram of transformer of the present invention;

Accompanying drawing 5 is transformer control flowchart of the present invention;

Accompanying drawing 6 is the energy storage schematic diagram under the high-speed braking state of the present invention;

Accompanying drawing 7 is the control flowchart under the high-speed braking state of the present invention.

Labels shown in the accompanying drawings:

1. Vehicle speed sensor; 2. ECU; 3. Front air intake grille; 4. Front exhaust grille; 5. Rear air intake grille; 6. Rear exhaust grille; 7. Front fan; 8. Alternator ;81, fixed coil winding; 82, variable coil winding; 83, sliding contact; 84, control motor; 85, speed sensor; 9, transformer; 10, motor; 11, rear fan; 12, front air duct; 13 1. Rear air duct; 14. Rectifier; 15. Battery; 16. Brake pedal sensor.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined in the present application.

Embodiment: As shown in accompanying drawings 1-7, the present invention discloses a utilization device for variable power of windward resistance of automobiles. Starting from reducing the maximum windward area, through the design of air ducts and the addition of energy recovery devices, a part of the energy of the oncoming airflow is converted into The kinetic energy of the car, including:

Vehicle speed sensor 1, described vehicle speed sensor 1 is installed at the wheel place of automobile, is used for measuring the speed of automobile;

ECU2, ECU2 can directly use the ECU of the vehicle itself;

Front air passage 12, described front air passage 12 is positioned at the front end of the car body of automobile, and the front end of automobile is provided with the front air inlet that communicates with front air passage 12, and described front air inlet is provided with front air intake grille 3, in The bottom of the car is provided with a front air outlet connected to the front air duct 12, the front air outlet is provided with a front exhaust grille 4, and the front air duct 12 is provided with a front fan 7. When the vehicle is running, the air flow from the front The air intake grille 3 enters the front air duct 12, and then the front exhaust grille 4 discharges the front air duct 12. The rear wall of the front air duct is arc-shaped, and the blades of the front fan 7 face the front air inlet. Fixed with a rotating shaft;

Generator 8, described generator 8 is installed in the car body of automobile, and generator 8 can be installed in front air channel 12, also can be installed in other positions of car body, and the rotor of generator 8 and the rotating shaft of front fan 7 are connected through a coupling transmission;

Rear air passage 13, described rear air passage 13 is positioned at the rear end of the car body of automobile, and the top of automobile is provided with the rear air inlet that communicates with rear air passage 13, and described rear air inlet is provided with rear air intake grille 5. The rear end of the car is provided with a rear exhaust port connected to the rear air passage 13, the rear exhaust grille 6 is provided in the rear air passage 13, and the rear fan 11 is provided in the rear air passage 13. The fan blade of the fan 11 faces the rear exhaust port, and the front side of the fan blade is fixed with a rotating shaft;

The front fan 7 and the rear fan 11 can adopt the fans of the horizontal axis or the fans of the vertical axis. Preferably, the front fan 7 and the rear fan 11 both adopt the fans of the vertical axis.

Preferably, the front air intake grille 3 and the rear air intake grille 5 are both active air intake grilles, and the front exhaust grille 4 and the rear exhaust grille 6 are all active exhaust grilles, which is convenient Grille opening and closing control.

Motor 10, described motor 10 is installed in the vehicle body of automobile, and motor 10 can be installed in rear air channel 13, also can be installed in other positions of vehicle body, and the rotating shaft of motor 10 and the rotating shaft of rear fan 11 are connected Shaft drive connection;

A transformer 9, the input end of the transformer 9 is connected to the generator 8, and the output end is connected to the motor 10;

The vehicle speed sensor 1 , the front air intake grill 3 , the front exhaust grill 4 , the rear air intake grill 5 , the rear exhaust grill 6 , the generator 8 , the transformer 9 , and the electric motor 10 are all signally connected to the ECU 2 .

Because the composition of the resistance when the car is running is not static, the car is mainly subjected to mechanical resistance when driving at low speed, and the proportion of air resistance increases sharply when the car is running at high speed. When the car is running at a speed of 90km/h, the air Resistance accounts for about 55% of the total running resistance, that is, 55% of the total power that the engine sends is consumed by air resistance at this moment, so when to start the present invention is very important.

When the present invention is in use, the vehicle speed sensor 1 is used to measure the vehicle speed of the automobile and sends the measurement result to the ECU2, and the ECU2 judges whether the vehicle speed reaches the opening condition of the present invention, for example, the opening condition can be set as the vehicle speed reaches 90km/h and above ; When ECU2 judged that the speed of the vehicle reached the opening condition of the present invention, ECU2 controlled and opened the front air intake grille 3, the front exhaust grille 4, the rear air intake grille 5, the rear exhaust grille 6, and the front fan 7 was in the resistance wind. Rotating under the action of the generator 8, electric energy is generated on the generator 8, and the generator 8 is connected to the transformer 9 through a wire. As the car moves forward, the airflow flows in from the front air intake grille 3, and the front exhaust grille 4 flows out; the transformer 9 is connected to the transformer 9 through a wire. The motor 10, the motor 10 turns the electric energy into the rotational kinetic energy of the rear fan 11, because the rear fan 11 rotates, the air flow flows from the rear air intake grille 5 into the rear air channel 13, and then flows out from the rear exhaust grille 6, resulting in a backward The thrust, the detailed flow chart is shown in Figure 3, can complete the recovery of the windward resistance of the vehicle at a constant speed and acceleration at high speed, and convert a part of the energy of the oncoming airflow during the driving process of the vehicle into the kinetic energy of the vehicle, which can reduce the energy consumption of the vehicle. Energy consumption, improve energy utilization.

The installation of the front air duct 12 and the rear air duct 13 is to make better use of wind energy and reduce the generation of additional internal circulation resistance, specifically:

When the car is running at a speed greater than or equal to 90km/h, the air at the front of the car flows into the car through the opened front air intake grille 3 at a speed of _V1 ;

The air entering the interior of the car is rectified and blown to the front fan 7 through the front air duct 12, and flows out of the car through the opened front exhaust grille 4;

The air at the rear of the car flows into the rear air duct 13 from the rear air intake grille 5 under the action of the rear fan 11;

The air is accelerated in the rear air passage 13, rectified and discharged out of the vehicle at a speed of _V2 through the opened rear exhaust grille 6, as shown in Figures 1 and 3 in detail.

According to ideal conditions, the following formula can be obtained from the law of energy conservation:

W ₁ =W ₂ ;

ω ₁ T ₁ = ω ₂ T ₂ = W;

F ₁ V ₁ =F ₂ V ₂ ;

In the above formula: W is the wind power, S is the swept area of the fan, ρ is the air density, V is the speed of the vehicle, V ₁ and V ₂ are the wind speed, F ₁ and F ₂ are the resistance and thrust of the wind. It can be seen from the above formula that under ideal conditions, the power of the front fan 7 is equal to the power of the rear fan 11 . If V ₁ >V ₂ , F ₁ <F ₂ can be made. In this case, the wind resistance received by the front fan 7 of the car is smaller than the thrust provided by the rear fan wind 11, so that the air resistance during the running of the car can be changed to Extra driving dynamics.

In order to achieve the condition of V ₁ >V ₂ , it is necessary to make the fan torque T ₁ <T ₂ . The present invention uses the transformer 9 to change the voltage and current of the motor 10 to change the speed of the rear fan 11, thereby satisfying the condition of T ₁ < T ₂ .

Preferably, as shown in FIG. 4 , the transformer 9 includes a closed iron core, and the closed iron core is provided with a fixed coil winding 81 connected to the generator 8 and a variable coil winding 82 connected to the motor 10. The variable coil winding 82 is provided with a sliding contact 83, and the sliding contact 83 is connected with a control motor 84 for adjusting the position of the sliding contact 83, and the control motor 84 is connected with the ECU2 for signals. Further, both the generator 8 and the motor 10 are provided with a rotational speed sensor 85, and the rotational speed sensor 85 is connected to the ECU2 for signals.

When the present invention was started, the rotational speed sensor 85 positioned in the car measured the rotational speed of the corresponding generator 8 and the motor 10, and the signal was delivered to the ECU2; whether the ratio of the rotational speed of the generator 8 and the motor 10 met the preset ratio by the ECU2, If not, control the control motor 84 to drive the sliding contact 83 to move to meet the preset ratio of the rotational speed _ω1 and _ω2 of the rear fan 11, so that the torque of the front and rear fans can meet _T1 and _T2 in real time. A certain ratio, the control flow chart is as shown in accompanying drawing 5.

Preferably, as shown in accompanying drawing 6, the output end of described transformer 9 is connected with rectifier 14, and described rectifier 14 is connected with storage battery 15, and described ECU2 is connected with brake pedal sensor 16, makes the present invention not only can finish to high-speed state Vehicles at a constant speed and acceleration can recover windward resistance. When the vehicle brakes, it can also shorten the braking distance and recover braking energy.

It is determined by ECU2 whether the device for utilizing the variable power of automobile wind resistance of the present invention is activated. If the device is activated, the position of the brake pedal is detected by the brake pedal sensor 16, and the ECU2 determines whether the brake pedal is stepped on. If so, the rear air intake grill is closed Grille 5, rear exhaust grille 6, generator 8; front fan 7 continues to rotate under the effect of resistance wind, generator 8 generates electric energy, and generator 8 is connected to transformer 9 through wires to process the electric energy; the two ends of rectifier 14 Connected to the transformer 9 and the storage battery 15 respectively, the rectifier 14 converts the alternating current into direct current that can be stored by the storage battery 15, and the specific control flow is shown in FIG. 7 .

Claims (6)

1. The utility model provides a car windward resistance becomes power utilization device which characterized in that includes:

a vehicle speed sensor (1), wherein the vehicle speed sensor (1) is arranged at a wheel of an automobile and is used for measuring the speed of the automobile;

ECU(2)；

the automobile comprises a front air duct (12), wherein the front air duct (12) is positioned at the front end in the automobile body of the automobile, a front air inlet communicated with the front air duct (12) is formed in the front end of the automobile, a front air inlet grille (3) is arranged in the front air inlet, a front air outlet communicated with the front air duct (12) is formed in the bottom of the automobile, a front air outlet grille (4) is arranged in the front air outlet, and a front fan (7) is arranged in the front air duct (12);

the generator (8) is arranged in the body of the automobile, and a rotor of the generator (8) is in transmission connection with the front fan (7);

the automobile comprises a rear air duct (13), wherein the rear air duct (13) is positioned at the rear end of an automobile body of the automobile, a rear air inlet communicated with the rear air duct (13) is formed in the top of the automobile, a rear air inlet grille (5) is arranged in the rear air inlet, a rear air outlet communicated with the rear air duct (13) is formed in the rear end of the automobile, a rear air outlet grille (6) is arranged in the rear air outlet, and a rear fan (11) is arranged in the rear air duct (13);

the motor (10) is arranged in the body of the automobile, and the rotating shaft of the motor (10) is in transmission connection with the rear fan (11);

the input end of the transformer (9) is connected with the generator (8), and the output end of the transformer is connected with the motor (10);

the transformer (9) changes the output voltage and current of the motor (10) and further changes the rotating speed of the rear fan (11), so that the torque of the front fan (7) is smaller than that of the rear fan (11), the resistance of wind borne by the front fan (7) of the automobile is smaller than the thrust provided by the wind of the rear fan (11), and the air resistance in running of the automobile can be changed into additional running power;

the vehicle speed sensor (1), the front air inlet grille (3), the front air outlet grille (4), the rear air inlet grille (5), the rear air outlet grille (6), the generator (8), the transformer (9) and the motor (10) are all in signal connection with the ECU (2).

2. The device for utilizing the power of changing the resistance to the wind of the automobile according to claim 1, wherein: the front air inlet grille (3) and the rear air inlet grille (5) are active air inlet grille, and the front air outlet grille (4) and the rear air outlet grille (6) are active air outlet grille.

3. The device for utilizing the power of changing the resistance to the wind of the automobile according to claim 1, wherein: the transformer (9) comprises a closed iron core, a fixed coil winding (81) connected with a generator (8) and a variable coil winding (82) connected with a motor (10) are arranged on the closed iron core, a sliding contact (83) is arranged on the variable coil winding (82), a control motor (84) for adjusting the position of the sliding contact (83) is connected with the sliding contact (83), and the control motor (84) is in signal connection with an ECU (2).

4. The device for utilizing the variable power of the windward resistance of the automobile according to claim 3, wherein: and the generator (8) and the motor (10) are respectively provided with a rotating speed sensor (85), and the rotating speed sensors (85) are in signal connection with the ECU (2).

5. The device for utilizing the power of changing the resistance to the wind of the automobile according to claim 1, wherein: the output end of the transformer (9) is connected with a rectifier (14), the rectifier (14) is connected with a storage battery (15), and the ECU (2) is connected with a brake pedal sensor (16).

6. The device for utilizing the power of changing the resistance to the wind of the automobile according to claim 1, wherein: the front fan (7) and the rear fan (11) are vertical-axis fans.

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