A method and system for defogging an automobile front windshield

Abstract

The invention provides a method for defogging the front windshield of an automobile. The defogging operation command input by the user when the automobile is powered on and the engine is in normal operation is obtained through the automobile front windshield defogging system, and a switch state signal is generated; the switch state is to be determined After the signal is valid, a defogging request command is generated; according to the defogging request command, after the preset starting conditions of the air conditioner compressor are detected and passed, an air conditioner compressor pull-in start command is generated; according to the air conditioner compressor pull-in start command, the air conditioner is turned on The compressor refrigerates and defoggs, and collects the current speed of the engine. After the current speed of the engine is determined to be greater than the speed threshold, a relay pull-in start command is generated; according to the relay pull-in start command, the connection between the battery inside the car and the electric heating wire is realized. Electric conduction to drive the electric heating wire to heat and defog. The implementation of the present invention integrates the windshield air conditioner defogging and electric heating defogging methods, which can not only effectively prevent the risk of battery power loss, but also reduce independent equipment, thereby saving input costs.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and system for defogging an automobile windshield. Background technique [0002] In winter when the temperature is relatively low, due to the large temperature difference between day and night, it is easy to condense into fog, even freeze and frost on the car windows, which will affect the line of sight. Electric heating defogging. Air conditioner defogging requires the best effect when the engine heating water temperature reaches 60°. However, the water temperature of cars in low temperature areas (such as northern regions) often does not reach 60° when starting, resulting in a certain increase in the windshield when using the air conditioner to defog. Fuel consumption, poor economical practicability. Therefore, how to realize the heating control of the windshield of the automobile is of great significance. [0003] At present, many manufacturers have carried out...

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Problems solved by technology

[0003] At present, many manufacturers have carried out research on the use of electric heating to defog the front windshield. Usually, many independent devices are added to the bus communication of the car to realize it. If the user does not start the engine, there will be a risk of power loss, which will affect the battery life. At the same time, due to the addition of too many independent devices, the input cost will increase

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