A power management circuit of a vehicle controller and a control method thereof

Abstract

The invention relates to the technical field of electrical control of automobiles and in particular relates to a power management circuit of a vehicle control unit and a control method of the power management circuit. The power management circuit comprises an ignition lock, a storage battery, a sensor and a vehicle control unit which is connected with the ignition lock, the storage battery, a CAN (controller area network) bus and the sensor respectively, wherein the vehicle control unit enters a normal working mode when detecting an ON signal of the ignition lock, so as to supply power to the sensor; the vehicle control unit enters a power-down working mode when detecting an Off signal of the ignition lock, so as to delay and stop supplying power to the sensor; and when the vehicle control unit in the power-down working mode detects that a CAN message is input, the vehicle control unit is awaked to enter the normal working mode. According to the power management circuit, the functions of power supply, power down and delaying and CAN message waking-up of the vehicle control unit are realized.

Description

technical field [0001] The invention relates to the technical field of automobile electrical control, in particular to a power management circuit of a vehicle controller and a control method thereof. Background technique [0002] In recent years, new energy vehicles have developed rapidly. Compared with traditional vehicle powertrain systems, the powertrain system of new energy vehicles has been transferred from the engine controller to the vehicle control system with the vehicle controller as the core. The main function of the vehicle controller is to realize driver intention recognition (vehicle acceleration, braking), power battery high-voltage contactor control drive, multi-power coupling control (such as hybrid power system power coupling transmission) and vehicle safety and failure. diagnosis. [0003] With the continuous upgrading of new energy vehicle controller microcontroller chips, 32-bit vehicle controller microcontroller chips have become mainstream in some pur...

AI Technical Summary

Problems solved by technology

[0006] 1. An external controller (low-voltage power distribution controller or self-holding circuit, etc.) is required to realize the delayed power-off or wake-up function of the power supply of the vehicle controller, which not only increases the hardware cost, but also some external controllers are mostly composed of relays, which reduces the Reliability and Electromagnetic Compatibility of Vehicle Control System

[0007] 2. The external controller collects the status of various hard-wire signals (charging wake-up, remote wake-up, ignition lock, etc.) as the basis for whether to supply power to the vehicle controller, which increases the cost of the vehicle control low-voltage wiring harness, and also increases the failure path

[0008] 3. When the vehicle controller provides +5V power supply for external sensors (such as accelerator pedal opening sensor, etc.), it is necessary to add additional voltage stabilization and isolation circuits, etc.

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