Electronic Horn Drive Signal Compensation for Temperature and Pressure
Solution Overview
Problem
Conventional electronic horns for motor vehicles and boats face significant challenges due to variations in ambient temperature and air pressure, which affect resonance frequency and sound pressure level, and fluctuations in power supply voltage, leading to reduced service life and sound quality.
Innovation Solution
An intelligent electronic horn that detects operating air pressure and temperature, using a single-chip microcomputer to perform calculations based on pre-established mathematical models and adjust the frequency and pulse width of the drive signal for optimal performance across varying environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electronic horn operates in high temperature environments, then the resonance frequency drifts to lower frequency due to temperature effects on air density and resonant cavity volume, but the sound pressure level is significantly attenuated
Solution Approach 1:
The patent adjusts the drive signal frequency dynamically based on detected temperature and air pressure conditions. When temperature increases causing resonance frequency drift to lower frequencies, the system compensates by modifying the drive signal frequency to maintain optimal sound pressure level and horn performance across varying environmental conditions.
Solution Approach 2:
The system uses sensors to detect temperature and air pressure conditions, processes this information through a microcomputer, and adjusts the drive signal parameters accordingly. This closed-loop feedback mechanism ensures the horn maintains consistent performance despite environmental variations by continuously adapting the drive signal to current operating conditions.
2Temperature
If the electronic horn operates in low temperature environments, then the resonance frequency drifts to higher frequency due to temperature effects on air density and resonant cavity volume, but the sound pressure level is significantly attenuated
Solution Approach 1:
The system dynamically adjusts the drive signal frequency in response to temperature decreases. When temperature drops causing resonance frequency to shift higher, the control system modifies the drive signal frequency to compensate for this drift, thereby maintaining optimal sound pressure level and horn performance across the full temperature range.
Solution Approach 2:
Through continuous temperature detection and processing, the system implements feedback control that adapts the drive signal parameters to counteract temperature-induced frequency drift. This ensures consistent sound pressure level regardless of whether the environment is hot or cold.
3Stress or pressure
If atmospheric pressure decreases as altitude increases, then the fundamental frequencies of the spiral resonant cavity and drive circuit greatly deviate, but the sound pressure level is significantly attenuated and the horn can no longer operate normally
Solution Approach 1:
The system adjusts both the drive signal frequency and pulse width based on detected air pressure conditions. When atmospheric pressure decreases at higher altitudes, the microcomputer processes this information and modifies the drive signal parameters to compensate for the frequency deviation, maintaining normal horn operation across different altitudes.
Solution Approach 2:
The air pressure sensor provides feedback to the control system, which then adapts the drive signal characteristics to compensate for pressure-induced frequency shifts. This closed-loop control ensures the horn operates normally whether at sea level or at high altitudes with lower atmospheric pressure.
4Power
If the power supply voltage varies within the range of 9-16 V, then the driving power changes significantly from 25 W to 79 W, but the sound level is significantly attenuated at low voltage and noise is caused by collision between movable and fixed cores at high voltage
Solution Approach 1:
The system dynamically adjusts the drive signal pulse width based on detected power supply voltage conditions. When voltage is low, the system increases pulse width to maintain adequate driving power and sound level. When voltage is high, the system reduces pulse width to prevent excessive power that would cause core collision and noise, thereby maintaining consistent sound quality across the full voltage range.
Solution Approach 2:
The voltage detection circuit provides feedback to the control system, which then adapts the drive signal pulse width to compensate for voltage variations. This ensures the horn receives appropriate driving power whether the voltage is at the lower end (9V) or upper end (16V) of the operating range, preventing both sound level attenuation and noise from core collision.
5Power
If conventional driving methods are used with constant current source or analog devices to reduce drive pulse width, then the current is reduced, but the driving power cannot be accurately controlled and occurrence of failure modes cannot be eliminated
Solution Approach 1:
The system employs a microcomputer-based closed-loop control that processes voltage detection information and precisely adjusts the drive signal pulse width accordingly. This digital feedback control provides accurate driving power management, eliminating the imprecision of analog methods and effectively preventing failure modes such as core collision while ensuring reliable operation across all voltage conditions.
Solution Approach 2:
The patent replaces conventional analog control methods with a digital microcomputer-based control system. This substitution enables precise calculation and adjustment of drive signal parameters based on detected voltage conditions, providing superior accuracy in driving power control and more reliable elimination of failure modes compared to analog approaches.
Data Source
Figure 1~2
Figure 3
AI summary
Provided are an intelligent electronic horn and an implementation method thereof. The method includes: detecting one or more of a current operating air pressure, operating temperature and power supply voltage of the electronic horn; calculating a compensation control parameter according to a detection result; performing compensation control on a drive signal of the electronic horn according to the compensation control parameter; and using the drive signal after the compensation control to drive the electronic horn to sound. In the present invention, the operating air pressure, temperature and power supply voltage of an electronic horn are detected, calculations are performed on the basis of a pre-established mathematical model according to detected values, and compensation control is performed on the frequency and pulse width of a drive signal of the electronic horn; whereby, the electronic horn can be driven by using a signal power that is most suitable for the current environment of the electronic horn in the case of varying air pressure and temperature, thereby achieving an almost identical optimal sound effect under different environmental conditions.