A control system of electronic thermostat

Abstract

The application discloses a control system of an electronic thermostat, including a minimum system of a single chip microcomputer, a CAN communication circuit, a power supply circuit, a valve stem position detection circuit, a wax bag temperature detection circuit and a wax bag heating circuit, a CAN communication circuit, and a valve stem position detection circuit. The detection circuit, the wax bag temperature detection circuit and the wax bag heating circuit are connected to the minimum system of the single chip microcomputer, and the power circuit is connected to the minimum system of the single chip microcomputer, the CAN communication circuit, the valve stem position detection circuit, the wax bag temperature detection circuit and the wax bag heating circuit. It has the following advantages: realizes the intelligent control and intelligent drive of the electronic thermostat, and makes the electronic thermostat into intelligent hardware. The engine ECU only needs to send an opening command to the electronic thermostat through the CAN bus to control the temperature of the thermostat. The operation of the electronic thermostat does not require the ECU to output control current to the electronic thermostat; by adding a position detection sensor to the output drive shaft of the electronic thermostat, the output position feedback function of the electronic thermostat is realized, thereby achieving a position closed loop functions for control and fault diagnosis.

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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