A method for improving the stability of the dimming signal of the vehicle
A dimming signal and stability technology, applied in the field of improving the stability of the dimming signal of the vehicle, can solve the problems of abnormal function, input PWM frequency difference, and voltage fluctuation of the vehicle battery, so as to achieve the effect of improving the stability.
Active Publication Date: 2019-06-11
FORYOU GENERAL ELECTRONICS
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[0003] Using the A / D sampling method to design the dimming function can be compatible with more dimming devices and has stronger versatility. However, there are many factors to be considered in the design of the dimming function using the A / D sampling method, such as input PWM Frequency difference, car battery voltage fluctuation, etc.
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[0035] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. The accompanying drawings are only for reference and description, and do not constitute a limitation to the protection scope of the present invention.
[0036] Such as figure 1 As shown, the embodiment of the present invention provides a method for improving the stability of the vehicle dimming signal, including:
[0037] Step 1. Determine whether the voltage of the car battery exceeds the preset voltage range. If yes, block the dimming signal sampling, otherwise go to the next step.
[0038] In this embodiment, the dimming signal is a voltage signal, which is output by the dimmer.
[0039] When the car engine is started, the lights and other high-power consumption devices are started when the car battery is low, the voltage of the car battery will change transiently and be lower than the working voltage range of the car (for example, for a car w...
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The invention provides a method for improving vehicle light modulation signal stability. The method comprises steps that whether a voltage of a vehicle storage cell surpasses a preset voltage scope is determined, if yes, light modulation signal sampling is shielded, if not, the process enters a next step; whether a light modulation signal sampling value is stable is determined, if yes, the process enters a next step, if not, the light modulation signal sampling value is discarded, and re-sampling is carried out; whether a light modulation decision voltage needs calibration is determined, if yes, fluctuation compensation correction for the light modulation decision voltage is carried out, if not, the process enters a next step; the light modulation decision voltage is compared with a preset light modulation reference voltage to acquire a pre-light-modulation value; whether a light modulation signal mean value corresponding o the pre-light-modulation value is at a critical point of the decision voltage is determined, if yes, hysteresis judgment for the light modulation signal mean value is carried out, a final light modulation value is determined according to the hysteresis judgment result, if not, the pre-light-modulation value is taken as the final light modulation value; a brightness value of a display screen is determined according to the final light modulation value. The method is advantaged in that backlight brightness stability is realized.
Description
technical field [0001] The invention relates to the technical field of backlight adjustment, in particular to a method for improving the stability of a dimming signal of a vehicle. Background technique [0002] With the development of automotive electronics technology, cars now have the function of steplessly adjusting the backlight brightness of components (such as instruments and buttons), making it more suitable for users' needs and improving the driving experience. As an important part of the car cockpit, the in-vehicle information system (hereinafter referred to as the car machine) has gradually become the standard configuration of the car. The brightness of the backlight of the car display screen also needs to be adjusted according to the brightness of the backlight of other parts in the car. At present, there are many ways to adjust the brightness of the background light of the car display screen. [0003] Using the A / D sampling method to design the dimming function...
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IPC IPC(8): H05B37/02
CPCH05B47/105
Inventor 张超
Owner FORYOU GENERAL ELECTRONICS