Electronic thermostat control system

Abstract

The invention discloses an electronic thermostat control system which comprises a single-chip microcomputer minimum system, a CAN communication circuit, a power circuit, a valve rod position detectioncircuit, a wax packet temperature detection circuit and a wax packet heating circuit. The CAN communication circuit, the valve rod position detection circuit, the wax packet temperature detection circuit and the wax packet heating circuit are connected with the single-chip microcomputer minimum system. The power supply circuit are connected with the single-chip microcomputer minimum system, the CAN communication circuit, the valve rod position detection circuit, the wax package temperature detection circuit and the wax package heating circuit. The electronic thermostat control system has thefollowing advantages that intelligent control and intelligent driving of an electronic thermostat are achieved, the electronic thermostat is made into intelligent hardware, an engine ECU can control operation of the electronic thermostat only by sending an opening degree command to the electronic thermostat through a CAN bus, and the ECU does not need to output control current to the electronic thermostat any more; and by additionally arranging a position detection sensor on an output driving shaft of the electronic thermostat, the output position feedback function of the electronic thermostatis achieved, and therefore the functions of position closed-loop control and fault diagnosis are achieved.

Description

technical field [0001] The invention relates to an engine control system, in particular to a control system of an intelligent electronic thermostat. Background technique [0002] The car thermostat automatically adjusts the amount of water entering the radiator according to the temperature of the cooling water, and changes the water circulation range to adjust the heat dissipation capacity of the cooling system to ensure that the engine works within a suitable temperature range. The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal operation of the engine. [0003] The current electronic thermostat is integrated with a heating resistance wire inside the thermostat. The engine ECU directly heats the resistance wire, and the ECU integrates a chip circuit that drives the resistance wire heating. In this way, when the ECU heats the thermostat, there will be a Larger current is not conducive to the stability of ECU, and larger cur...

AI Technical Summary

Problems solved by technology

[0003] The current electronic thermostat is integrated with a heating resistance wire inside the thermostat. The engine ECU directly heats the resistance wire, and the ECU integrates a chip circuit that drives the resistance wire heating. In this way, when the ECU heats the thermostat, there will be a Larger current is not conducive to the stability of ECU, and larger current will cause signal interference

The second problem with the electronic thermostat is that the electronic thermostat is controlled in an open loop. There is no feedback mechanism for the temperature and stroke of the electronic thermostat itself. After the resistance wire is heated, does the electronic thermostat perform to the specific None of the commands have detection and feedback

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