Foreword
How can we make the car cab have more functions, make the engine have more power, and at the same time can meet the requirements of the government for driving distances per gallon? Only a new generation of low on-resistance power MOSFETs are used in the traditional car The electric power system and hydraulic system are changed to electronic systems. These MOSFETs can not only improve the comfort and safety of the car, but also improve the distance traveled by fuel.
The engine must not only drive the car on the road, but also power the entire car system. Now people have higher and higher requirements on the entertainment, comfort and safety of cars. Through in-depth analysis, it is found that for an ordinary car, the energy generated by each gallon of gasoline is ultimately used for less than 15% of the wheels, and most of the energy is wasted by heat. American law requires that passenger cars must travel an average of 27.5 miles per gallon, and for cars that account for more than half of new car sales, such as SUVs, small passenger cars, and light trucks, it is required to reach the new standard of 22.2 miles per gallon in 2007.
People are asking automakers to provide a more efficient and functional car, and its cost is within the range acceptable to the public. In order to do this, many systems are making great improvements, for example, to improve the fuel efficiency of the engine, the hydraulic system is changed to an electronic system (this can reduce the energy consumption of the engine in many ways). In terms of reducing energy waste, almost every system receives attention.
Power supply system and cooling fan
In terms of power generation, the traditional method of generating DC power in automobiles is to use an alternator and install a pulley on the shaft of the generator. The fan belt is driven by the crankshaft. The alternating current generated by the alternator is converted into direct current through a diode three-phase rectifier bridge. At the rated current, there is generally a voltage drop of about 1V across the diode. If the car uses 1kW (approximately 70A) of power, the power consumed by the diode is about 140W. Based on the 80% efficiency, the engine needs to provide 175W more power to offset the influence of the diode rectifier bridge. . After replacing the diode with MOSFET, the power loss will be reduced to below 2W, and the energy saved can be used to increase the unit fuel travel distance by 1% to 3%, and can also be used to drive other systems.
The cooling fan of the engine can be changed from a traditional engine crankshaft to an electronic fan. The electronic fan only runs when necessary, and is controlled by only one MOSFET, which can save at least 100W of power.
Start the motor
Imagine that when you turn the key to start the car, the starting motor will drive the engine to start the car. The alternator then charges the battery to supply power to the entire electrical system. At other times, starting the motor has no effect, but a burden.
The basic design of the engine and the motor are the same. The main difference between them is the flow of electrical energy. At present, the starter motor is a DC motor, which can easily use a power MOSFET inverter bridge circuit to convert a DC power source (such as a battery) into an AC power source, and use it to drive the AC motor as a starter motor to rotate. Once the engine is running, the rectified state of the power MOSFET inverter bridge circuit can also be used to convert AC power to DC power to power the electrical system. All this can be achieved by using an alternator starter and a power MOSFET inverter bridge circuit. When driving a 3kW load, the loss of this power MOSFET inverter bridge is less than 10W.
Power steering system
The power steering system is a good idea for system transformation. The traditional power steering system uses an amplification method to reduce the power required to turn the steering wheel. This method uses a hydraulic power steering pump to achieve the goal. The use of a power steering system with a fixed magnification has a major disadvantage. If the system is designed to reduce the power required for the car to turn the steering wheel when it is stationary, the steering wheel will appear looser at high speeds. A conventional system has a liquid pump, which is mechanically connected to the engine. When running, even if the car is moving in a straight line, it will consume energy.
The application of a complete electronic power steering (EPS) system can remove the fixed load placed on the engine. In an electronic steering system, the motor is directly mounted on the rack and pinion steering component, such as in a car, directly mounted on the steering column. These motors are controlled by power MOSFETs with very small RDS (ON) for high efficiency. These systems absorb less power from the engine, but can provide more energy and fuel efficiency. In addition to lower energy consumption during operation, these systems are less expensive than traditional hydraulic power steering systems. The complete EPS system is lighter than the traditional system, which also helps to improve fuel efficiency.
Transmission system
In the transmission process, the conventional automatic transmission using a torque converter will increase fuel consumption by 5% to 10% compared to manual transmission. Now, the electro-hydraulic system is driven by advanced power semiconductor technology, and the torque converter is eliminated, which reduces energy loss. However, all the weight of the liquid pump and the hydraulic system are still there. When the clutch and the transmission controlled by the advanced channel power MOSFET are fixed in the manual transmission, the automated manual transmission will increase fuel utilization. This technology was originally developed for Formula One racing. This kind of car drives like a traditional automatic car. The driver does not need to change gears, which reduces fuel consumption by 5% to 10%.
Braking System
We have already discussed the electro-hydraulic brake system, which has now replaced the original auxiliary vacuum brake with a motor controlled by advanced power semiconductors (such as slot-gate MOSFETs). However, where the electric brake is fixed on the fixed caliper disc or brake drum, the electric brake can be installed. The electric brake can perform stable control, brake each wheel, and correct any tendency of its rotation. Our existing ABS system uses power MOSFETs. If the computer on the car detects that the car is out of control, the system will issue a pulse-triggered brake action.
in conclusion
Comprehensively considering the above energy-saving schemes, the application of automotive electronic systems can not only significantly improve the efficiency of automobile engines and reduce fuel consumption, but also improve the performance of automobiles and further reduce costs.
Housed in compact packages with profiles as low as 0.95 mm, our range of electret condenser Microphones and MEMS microphones offers a variety of performance options to meet the voice capture and audio recording needs of your next design. Our microphones are available with omnidirectional, unidirectional, and Noise Cancelling directivity, while featuring sensitivity ratings from -54 up to -24 dB and signal to noise ratios from 56 up to 72 dBA.
Microphones
Mic Wireless,Wireless Microphone,Bluetooth Microphone,Condenser Microphone
NINGBO SANCO ELECTRONICS CO., LTD. , https://www.sancobuzzer.com