Please select the most similar patent number from A, B, C and D. Which number is?
A motor vehicle and water craft horn, comprising: at least one capacitor (C2) of about 220-10000 μF connected in parallel at the input end of the horn power supply to eliminate electromagnetic interference caused by electromagnetic radiation, conduction, and coupling. Also provided is a method of eliminating motor vehicle and water craft horn electromagnetic interference, an electronic device used on a motor vehicle and water craft, and a motor vehicle and water craft. The present invention solves the problem of ultralimit of conducted emission (CE) and radiated emission (RE) when a motor vehicle or water craft uses a horn for CIRS 25 testing, thus enabling the horn EMC index to meet the standard.
A: Provided are an intelligent electronic horn and an implementation method therefor. The method includes: detecting one or more of the current operating air pressure, operating temperature and power supply voltage of an electronic horn; according to the detection result, calculating a compensation control parameter; according to the compensation control parameter, performing compensation control on a drive signal of the electronic horn; and driving the electronic horn to sound with the drive signal after the compensation control. By detecting the operating air pressure, temperature and power supply voltage of an electronic horn, performing calculations with a pre-established mathematical model according to detected values, and performing compensation control on the frequency and pulse width of a drive signal of the electronic horn, the present method allows that the electronic horn can be driven at a signal power which meets the current environment most in the case of varying air pressure and temperature, achieving almost consistent optimal sounding effects under different environmental conditions.
B: Provided is a motor vehicle giving-way indicator, comprising a controller (1), an indicator, a wireless communication module (2) and a power module. The wireless communication module (2) is installed in the controller (1). The controller (1) is connected with an on-board diagnostic system i.e., motor vehicle OBD system, of the motor vehicle, and the motor vehicle OBD system sends acceleration or deceleration information of the vehicle to the controller (1), so that the controller (1) obtains the driver&#39;s driving intention by analyzing the received acceleration or deceleration information. The power of the controller (1) adopts the power of the motor vehicle. The indicator is connected with power module, to obtain electric energy needed for work. The indicator and the controller (1) are connected through the wireless communication module (2), and the controller (1) transmits giving-way information triggering signal to the indicator through the wireless communication module (2), and the indicator prompts an image and a voice. Through the analysis of the driving intention of the driver of the motor vehicle, the indicator transmits the driving intention to a pedestrian or a non-motorized driver in the form of sound and images for the pedestrian and the non-motorized driver to make a decision, thus improving traffic flow and traffic safety.
C: A boosting device for a non-motor vehicle, and the non-motor vehicle provided with the boosting device. The boosting device comprises a driving motor (1), a transmission module (2), a control module (3), and a power supply (4). The transmission module (2) acts on an edge of a hub of a wheel or a tire of the non-motor vehicle, so that the driving motor (1) for driving the transmission module (2) to work can drive the wheel to rotate by only using a low power, and the driving motor (1) can be a low-power motor of a small size; meanwhile, the power supply (4) for supplying electric energy to the driving motor (1) can also reduce power requirements, so that a low-power battery of a small size can be selected, and accordingly the whole weight of the non-motor vehicle provided with the boosting device is effectively reduced. Furthermore, the boosting device has a simple structure and low manufacturing costs, and is applicable to a variety of non-motor vehicles.
D: A motor vehicle throttle controlling device; for an electronic throttle, a main piece (11) of a motor vehicle hand throttle device is designed and manufactured, and is provided with a movable element (3) thereon; a restriction mechanism is provided on the motor vehicle hand throttle device such that the movable element (3) can move only on the main piece (11) of the motor vehicle hand throttle device; the main piece (11) of the motor vehicle hand throttle device is provided with a spring (4) thereon capable of returning the movable element (3) to an original position; the movable end (2) of a displacement transducer (1) engages the movable element (3) of the hand throttle device or engages a manual component; for a non-electronic throttle, the manual component engages a pull wire or a pull rod connected to a throttle plate. The hand throttle device can be used independantly, and can also be used in conjunction with a foot throttle (20) pedal capable of engaging the movable element (3), the movable end (2) of the displacement transducer (1), and the pull wire or pull rod connected to the throttle plate.
Answer: A