Abstract: A rotation display method and apparatus for the screen of an on-board unit. The method comprises: obtaining first acceleration data of the screen of an on-board unit in the current cycle, and determining a screen display direction matching the first acceleration data as a first screen display direction according to a preset matching strategy (101); obtaining second acceleration data of the screen of the on-board unit in the next cycle, determining, according to the preset matching strategy, a screen display direction matching the second acceleration data, and if the screen display direction matching the second acceleration data is a second screen display direction, determining that the next cycle is a screen rotation effective cycle (102); and determining whether the number of continuous screen rotation effective cycles exceeds a preset number, and yes, controlling the screen of the on-board unit to rotate from the first screen display direction to the second screen display direction (103).

Abstract: An internal resistance testing device includes an excitation source and a battery pack, an adjustable resistance R, a sampling unit, and a control unit. The excitation source and the battery pack form a loop circuit. The adjustable resistance R may be located at the loop circuit formed by the excitation source and the battery pack. The sampling unit samples the voltage between two sides of the battery pack, the voltage between two sides of the adjustable resistance R, and the value of the adjustable resistance R. The control unit calculates internal resistance of the battery pack according to the signal value collected by the sampling unit. The internal resistances of different voltage-ranges the battery pack are determined by adjusting the value of the adjustable resistance R to cause the actual excitation voltage to be equal to the range voltage of the sampling unit.

Abstract: An internal resistance testing device includes an excitation source and a battery pack, an adjustable resistance R, a sampling unit, and a control unit. The excitation source and the battery pack form a loop circuit. The adjustable resistance R may be located at the loop circuit formed by the excitation source and the battery pack. The sampling unit samples the voltage between two sides of the battery pack, the voltage between two sides of the adjustable resistance R, and the value of the adjustable resistance R. The control unit calculates internal resistance of the battery pack according to the signal value collected by the sampling unit. The internal resistances of different voltage-ranges the battery pack are determined by adjusting the value of the adjustable resistance R to cause the actual excitation voltage to be equal to the range voltage of the sampling unit.