CN108545020A - Automobile engine alarm system based on voice signal - Google Patents

Abstract

The invention discloses an automobile engine alarm system based on sound signals, comprising: a signal acquisition module, which is arranged on the engine and used for collecting audio signals of the engine; The connection is used to receive the audio signal, and compare the frequency domain amplitude of the audio signal with the set frequency domain amplitude, if it is detected that the frequency domain amplitude of the audio signal exceeds the set frequency domain amplitude for a predetermined number of times within the set time , then the main control module transmits the alarm signal to the alarm module; the signal input port of the alarm module is connected with the signal output port of the main control module by a wire, and is used to receive the alarm signal and send out an alarm prompt; the power module is used to collect the signal The normal operation of the module, the alarm module and the main control module provides voltage, and the present invention can monitor the current running state of the engine according to the change of the sound signal parameters of the engine, so as to quickly judge whether the engine fails.

Description

Alarm system of automobile engine based on sound signal

technical field

The invention relates to an automobile engine alarm system based on sound signals, belonging to the technical field of engine safety.

Background technique

The engine is the power plant of the vehicle, and its running status directly affects the performance of the entire vehicle. The structure of the engine is complex and the working conditions are harsh, so the possibility of failure is greater, so it is necessary to monitor the engine of the car. At present, there are many testing technologies for engines in foreign countries, and the accuracy is also high, but the system is complicated and the cost is high. Domestically, there are few means of diagnosing engine faults. For engines in operation, the driver or maintenance personnel basically rely on human judgment and repair of faults after discovering abnormalities. This method is not only inefficient, but also depends on human subjectivity. , with poor accuracy. The sound signal of the engine contains a wealth of engine state information, so it is theoretically feasible to know the current state of the engine by monitoring and analyzing the sound signal.

Contents of the invention

The technical problem to be solved by the present invention is to provide an automobile engine alarm system based on sound signals, to monitor the current running state of the engine according to the change of the sound signal parameters of the engine, so as to judge whether the engine fails.

The technical scheme of the present invention is: a kind of automobile engine warning system based on sound signal, comprises:

The signal collection module is arranged on the engine and is used for collecting the audio signal of the engine;

The main control module, whose signal input port is connected with the signal output port of the signal acquisition module, is used to receive the audio signal, and compares the frequency domain amplitude of the audio signal with the set frequency domain amplitude, if within the set time Detecting that the frequency domain amplitude of the audio signal exceeds the set frequency domain amplitude for a predetermined number of times, the main control module transmits the alarm signal to the alarm module;

The alarm module, whose signal input port is connected with the signal output port of the main control module, is used to receive the alarm signal and issue an alarm prompt;

The power module is used to provide voltage for the normal operation of the signal acquisition module, the alarm module and the main control module.

It also includes a communication module, the signal input port of the communication module is connected with the signal output port of the main control module, and the signal output port of the communication module is connected with the user terminal in order to send the alarm signal to the user terminal.

The signal acquisition module is an audio sensor.

The beneficial effects of the present invention are: the alarm mechanism based on the sound signal sent by the engine when the present invention is working, compared with the prior art, the sound signal is a parameter that is easy to collect and analyze, and introducing it into the engine monitoring system will make The development and operation of the whole system is simplified, and the current running state of the engine can be monitored according to the sound signal, and whether the engine is faulty can be quickly judged, which is convenient for timely processing and adjustment of the engine, and avoids catastrophic accidents.

Description of drawings

Figure 1 is a block diagram of the system;

Fig. 2 is the system flowchart of this system.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the invention is further introduced:

With reference to Fig. 1, a kind of car engine warning system based on sound signal according to the present invention comprises:

The signal collection module is arranged on the engine and used for collecting the audio signal of the engine. The signal acquisition module is preferably an audio sensor, such as the MP45DT02 digital audio sensor, which can directly output digital signals to simplify system circuit design.

The main control module, whose signal input port is connected with the signal output port of the signal acquisition module, is used to receive the audio signal. After frequency domain processing, the frequency domain amplitude of the audio signal is compared with the set frequency domain amplitude. If it detects that the frequency domain amplitude of the audio signal exceeds the set frequency domain amplitude for a predetermined number of times within the set time, the main control module judges that the engine is faulty, and transmits an alarm signal to the alarm module. In one example, the core chip of the main control module is STM32F407. This module needs to complete tasks such as data processing, signal filtering, frequency value detection, etc., and at the same time judge whether to enable the alarm module.

The alarm module, whose signal input port is connected with the signal output port of the main control module, is used to receive the alarm signal and issue an alarm prompt. The alarm module uses a buzzer.

A communication module, the signal input port of the communication module is connected to the signal output port of the main control module, and the signal output port of the communication module is connected to the user terminal for communication, so as to send the alarm signal to the user terminal. The communication module adopts GSM communication mechanism. Because the environment of the automobile engine is changing frequently during operation, the alarm sound of the buzzer installed around the engine may be submerged by the environmental noise, making it difficult for the user to detect. Therefore, when an abnormal situation occurs by using GSM communication, the main control module controls to send an alarm message to the user terminal, such as a mobile phone, so that the user can check it at any time without being affected, and the double insurance setting improves the reliability of the system.

The power module is used to provide voltage for the normal operation of the signal acquisition module, alarm module, communication module and main control module. The voltage module can use the storage battery on the car, and can also be connected to an external power supply.

The software program flow chart of this system is shown in Figure 2. When the engine starts to work, the system is powered on, and the audio sensor starts to collect the sound signal under the working state of the engine, and converts it into an audio spectrum signal and filters it for noise reduction. According to the previous According to experience, engine faults tend to be concentrated in the low frequency band, so focus on extracting the maximum value of the signal amplitude in the low frequency band of the sound. If the consecutive times, such as 3 times, exceed the preset value, the system will start an alarm program, and first send a message to the user's mobile phone through the GSM communication module. Send an alarm reminder text message, and then start the buzzer. When the alarm sounds, the user can stop and overhaul the engine. In one example, the number of comparisons can be set to 3, in order to prevent the occurrence of accidental situations and improve system reliability.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (3)

1. a kind of automobile engine alarm system based on voice signal, which is characterized in that including：

Signal acquisition module, the audio signal on engine and for acquiring engine；

The signal output port conducting wire of main control module, signal input port and signal acquisition module connects, for receiving audio Signal, and audio signal frequency domain amplitude is compared with setting frequency domain amplitude, if detecting within the set time, audio is believed Number frequency domain amplitude is more than setting frequency domain amplitude pre-determined number, then alarm signal is transferred to alarm module by main control module；

The signal output port conducting wire of alarm module, signal input port and main control module connects, for receiving alarm signal, And send out alarm；

Power module provides voltage for the normal work to signal acquisition module, alarm module and main control module.

2. the automobile engine alarm system according to claim 1 based on voice signal, it is characterised in that：Further include leading to Believe that module, the signal input port of communication module and the signal output port of main control module connect, the signal output of communication module Port is connect with user terminal communication, and alarm signal is sent to user terminal.

3. the automobile engine alarm system according to claim 1 based on voice signal, it is characterised in that：The letter Number acquisition module is audio sensor.