A method of waking up obd equipment through voltage fluctuation

Abstract

The invention relates to a method waking up OBD equipment through voltage fluctuation. The method comprises steps that, a constant electricity voltage on an OBD interface of a vehicle is measured by OBD equipment through a single-chip microcomputer; whether the vehicle is in a start state is determined, if yes, the OBD equipment is waken up; the waken-up OBD equipment enters a work state; when the OBD equipment enters the work state, whether equipment waking up is normal is determined; if engine rotating speed information can not be read or the read engine rotating speed information is 0 circle / second, equipment waking up is an error, and the OBD equipment enters a dormant state after 30 seconds; when the engine rotating speed information can be read and is not 0 circle / second, equipment waking up is normal, and the OBD equipment continuously enters the work state. According to the method, the voltage fluctuation at the OBD interface in a start process of the vehicle, voltage fluctuation of constant electricity row needles at the OBD interface of the vehicle is monitored through the single-chip microcomputer of the OBD equipment, dormancy and waking up of the OBD equipment are realized, and influence of a technical problem on design of the OBD equipment is avoided.

Description

technical field [0001] The invention belongs to the field of automotive OBD applications, and in particular relates to a method for waking up OBD equipment through voltage fluctuations. Background technique [0002] In recent years, with the rapid development of Internet of Vehicles technology, vehicle-based big data collection, data return, data analysis and data application have been widely used in the service industry related to automobiles, and the OBD interface is a dedicated interface provided by automobile manufacturers. The only interface for data exchange between the car body and the outside world, and this interface can also provide 12V uninterrupted power supply for external electronic devices based on the OBD interface. , It does not need to destroy the characteristics and advantages of the original car line. Therefore, OBD devices based on OBD interfaces have been rapidly developed and applied in the field of Internet of Vehicles. The device can transmit the ve...

AI Technical Summary

Problems solved by technology

Therefore, the design of the OBD device usually does not design the switch button. It is not necessary for the user to turn on the device when starting the vehicle, and it is not necessary for the user to turn off the device when getting off the car. The OBD device does not need to destroy the original car circuit when installing it. It should be an adaptive mode, that is, the OBD device can work by itself when the vehicle is turned on, and can sleep by itself when the vehicle is turned off. It should not be greater than 20mAh), otherwise, when the car is turned off, the battery power of the car will be easily consumed by the OBD device, which will cause the problem that the next car cannot be started.

[0004] To sum up, it can be concluded that since the installation of OBD equipment is realized through the plug-in of the OBD interface, it is the inherent property of OBD equipment to be easy to install and not to damage the original vehicle circuit, but how to make the OBD equipment work when the vehicle is turned off? Entering the low power consumption mode, the OBD device can automatically enter the working mode when the vehicle is ignited. The signal can be used by the OBD device for signal collection and judgment, that is to say, as long as the OBD device is inserted into the OBD interface of the car, the device will be connected to the long power supply and enter the working mode. When the OBD device is in the working mode, its built-in GPS module, The GSM module, OBD module and MCU module will all be in working state, and the peak power consumption is about 600mAh, or even higher. If the vehicle is turned off and the OBD device is in the working mode, the battery power of the car will be exhausted quickly. , so as to bring troubles to the user that the vehicle cannot be started next time, so how to make the OBD device enter the standby state when the vehicle is turned off to reduce power consumption without unplugging the OBD device, and how to make the OBD device enter the standby state when the vehicle is ignited? Wake up to enter the working mode is the core technology that OBD device design needs to break through

[0005] However, most of the OBD devices sold in the market now use the built-in three-axis acceleration sensor method to realize the sleep and wake-up of the OBD device. Low-power sleep mode, when the vehicle is moving, the built-in three-axis acceleration sensor of the OBD device can monitor the vibration signal, so the OBD device enters the continuous working mode. According to the working principle of the OBD device, we can easily infer that, When the vehicle is parked in place, or the vibration signal value collected by the vehicle is not enough during driving, the OBD device will always be in a dormant state and cannot enter the working state. From this analysis, we can see that the design scheme of using the built-in three-axis acceleration sensor of the OBD device to monitor the vehicle vibration to allow the OBD device to enter the working and sleeping modes does not truly reflect the vehicle. Ignition and flameout status, so the biggest flaw in this design is that the OBD device does not wake up when it should be woken up, and it does not sleep when it is time to sleep

Images