Vehicle power supply system and power supply control method

Abstract

The invention discloses a vehicle power supply system and a power supply control method. The vehicle power supply system comprises a first power supply module, a second power supply module, a controlmodule and a power switch module, wherein the second power supply module is externally connected with a load through the power switch module, the first power supply module is externally connected withthe load, and the control module is connected with the load and the power switch module; the first power supply module is used for supplying power to the load; the control module is used for detecting the power supply condition of the first power supply module to the load, generating a switching signal based on the load power supply condition and sending the switching signal to the power switch module; the power switch module is used for determining a switching state of the power switch module based on the received switching signal; and the second power supply module is used for supplying power to the load based on the switching state of the power switch module. According to the embodiment of the invention, the control module detects the power supply conditions of the power supply modulesto the load, generates the switching signal according to the power supply conditions to control the state of the power switch modules, realizes mutual independence and no mutual influence of the twopower supply modules, and meets power supply requirements of automatic driving.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of intelligent vehicles, and in particular to a vehicle power supply system and a power supply control method. Background technique [0002] With the development of automobile intelligence and electrification, the intelligence of vehicles is getting higher and higher. While gradually realizing automatic driving and liberating the driver's hands, more stringent requirements are put forward for the functional safety of vehicles. Higher functional safety requirements This means that the power supply system of intelligent driving vehicles must have the ability to back up redundant power supply. [0003] figure 1 It is a circuit structure diagram of parallel connection of a storage battery to provide redundant power supply in the prior art; figure 1 As shown, the direct parallel connection of two batteries will lead to long-term mutual charging and discharging between the two batteries, an...

AI Technical Summary

Problems solved by technology

[0003] figure 1 It is a circuit structure diagram of parallel connection of a storage battery to provide redundant power supply in the prior art; figure 1 As shown, the direct parallel connection of two batteries will lead to long-term mutual charging and discharging between the two batteries, and the life decay will be accelerated, which will directly lead to shortening the battery replacement cycle.

[0004] figure 2 It is a circuit structure diagram of redundant power supply provided by dual DC-DC (Direct Current-Direct Curren, DC-DC) converters in the prior art, as shown in figure 2 As shown, two high-voltage to low-voltage DC-DC converters, one of which is high-power as the main power supply output of the low-voltage system, and the other low-power one is used as the backup power supply output of intelligent driving loads and safety-related loads. This solution can Realize the natural isolation of the two power supply circuits and avoid the mutual influence of the two batteries. However, the backup battery of this structure is still in the state of charging and discharging for a long time. As a backup power supply, its life is not long enough. For new energy vehicles

[0005] image 3 It is a circuit structure diagram of a redundant power supply provided by multiple switching devices in the prior art, such as image 3 As shown, switch S1 is normally closed and switch S2 is normally open. When there is a problem with the main power supply circuit, S1 is disconnected and S2 is closed, but the two batteries are not truly isolated. The problem of discharge will shorten the service life of the battery

Images