Write protection method of vehicle-mounted external memory

A technology of external memory and write protection, applied in electric vehicles, vehicle components, and response errors, etc., can solve problems such as data loss and NANDFlash data damage, and achieve the effect of ensuring safety.

Active Publication Date: 2012-07-04
HUIZHOU DESAY SV AUTOMOTIVE
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  • Claims
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AI Technical Summary

Problems solved by technology

For vehicle-mounted electronic equipment that uses NAND Flash as a data storage device, since the critical voltage of NAND Flash memory is 2.8 volts, when the instantaneous voltage of the car battery is below 2.8 volts, if the vehicle-mounted electronic equipment just writes data into NAND Flash at this time, It will cause damage to the data in the NAND Flash and even cause the loss of the data stored in the entire NAND Flash.

Method used

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  • Write protection method of vehicle-mounted external memory
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Embodiment Construction

[0019] To facilitate the understanding of those skilled in the art, the present invention will be further described in detail below by taking the NAND Flash memory in the vehicle navigation system as an example in conjunction with the accompanying drawings.

[0020] After the car navigation system is turned on, when the user operates the navigation system, the data will be saved to the file of the NAND Flash memory (for the convenience of description, hereinafter referred to as the external memory).

[0021] Such as figure 1 As shown, in one embodiment, when the car navigation system confirms that there is data change that needs to be stored, the write protection method of the external memory specifically includes the following steps:

[0022] Step S1, start vehicle speed detection.

[0023] Step S2, judging whether the current vehicle speed is greater than or equal to a preset speed. In the background technology section, it was mentioned that the on-board power supply (batt...

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Abstract

The invention relates to a write protection method of a vehicle-mounted external memory. Before data are stored in the external memory, the following steps are executed: step S2, judging whether a current car speed is more than or equal to a pre-set speed; step S3, writing the data into the external memory when the current car speed is more than or equal to the pre-set speed; and step S4, storing the data into an internal memory when the current car speed is less than the pre-set speed. According to a safe writing-in method of the vehicle-mounted external memory, provided by the invention, whether the car speed is more than the pre-set value is judged; when the car speed is more than the pre-set speed, the voltage of a car battery is stable, a car does not ignite again and the memory works at a safe and stable voltage; and therefore, the safety of data written into the memory can be ensured.

Description

technical field [0001] The invention relates to the field of vehicle-mounted electronic equipment, in particular to a write protection method for a vehicle-mounted external memory. Background technique [0002] The power supply of on-board electronic equipment comes directly from the battery of the car. When the car is ignited and started, because the engine consumes a lot of power at the moment of starting, the battery will have an instantaneous low voltage. The level and duration of this voltage have a lot to do with the state of the battery. Relationship. [0003] If the battery is seriously low, the voltage of the car battery may momentarily drop below 2.8 volts when the engine is started. For vehicle-mounted electronic equipment that uses NAND Flash as a data storage device, since the critical voltage of NAND Flash memory is 2.8 volts, when the instantaneous voltage of the car battery is below 2.8 volts, if the vehicle-mounted electronic equipment just writes data into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14B60L3/00
Inventor 陈定柱程时宋陈文炜
Owner HUIZHOU DESAY SV AUTOMOTIVE
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