Relay control circuit of hybrid vehicle

Abstract

The invention provides a relay control circuit which can avoid arc discharge of relays and timely disconnect high tension loops when vehicles collide. The control circuit comprises a power supply (1), an output end of a main relay (2) and a load (3); wherein, the components are sequentially connected in series; an input end of the main relay (2) is connected with a switch (4) capable of controlling pull-in of the main relay (2). The key lies in that the output end of the main relay (2) is connected with a precharging circuit in parallel; the precharging circuit is formed by series connection of a precharging relay (5) and current-limiting resistance (6); the precharging relay (5) is connected with a switch (11) which controls pull-in of the precharging relay (5); the output end of the main relay (2) is connected with a charging capacitor (7) in series; the charging capacitor (7) is connected with the load (3) in parallel; the input end of the main relay (2) is also connected with a protective circuit (8) which can control the disconnection of the main relay (2) when vehicles collide.

Description

technical field [0001] The invention belongs to the technical field of manufacturing hybrid electric vehicles, and in particular relates to a control circuit of a hybrid electric vehicle. Background technique [0002] In today's increasingly tense oil energy, hybrid vehicles with less fuel consumption are getting more and more attention. A hybrid vehicle is equipped with a large-capacity battery as an energy source, and a high-voltage relay is installed between the battery and the load. The driver selects the power source as the internal combustion engine or the battery by controlling the on / off of the relay. It can be said that the relay is connected to the low-voltage control system. As a bridge between the electric circuit and the high-voltage power circuit, the current passing through the relay is sometimes as high as several hundred amperes. In such a large current and high voltage environment, the contacts of the relay are prone to arcing, resulting in sintering of the...

AI Technical Summary

Problems solved by technology

A hybrid vehicle is equipped with a large-capacity battery as an energy source, and a high-voltage relay is installed between the battery and the load. The driver selects the power source as the internal combustion engine or the battery by controlling the on / off of the relay. It can be said that the relay is connected to the low-voltage control system. As a bridge between the electric circuit and the high-voltage power circuit, the current passing through the relay is sometimes as high as several hundred amperes. In such a large current and high voltage environment, the contacts of the relay are prone to arcing, resulting in sintering of the contacts and affecting the normal use of the car. , and even cause security problems

In addition, when the vehicle collides, the high-voltage circuit must be disconnected in time to avoid deformation of the vehicle body and cause the vehicle body to be connected to high voltage, causing secondary damage to the driver and passengers.

At present, there is no perfect relay control circuit for hybrid vehicles

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