ERROR CANCEL METHOD AND ERROR CANCEL DEVICE OF ANALOG DATA TRANSMISSION BETWEEN CONTROLLERS OF CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To provide always correct data by sending error canceling voltage to a receiving side controller from a transmitting side controller, and performing ratio converting processing by using this error canceling voltage.;SOLUTION: Analog data S1 outputted by conversion of a D/A converter 102 of a transmitting side main controller 100 is related to reference voltage V0 outputted from a reference voltage source 103 and a digital quantity of an engine speed, and reference voltage V1 outputted from a distributing circuit 104 is also related to the reference voltage V0 and the voltage dividing ratio (c). While, in a receiving side sub-controller 200, when the analog data S1 and the reference voltage V1 are inputted, these are respectively converted into a digital value by an A/D converter 201. A CPU circuit 101 performs operation processing (ratio operation processing) for canceling a transmission error contained in transmission data from the analog data S1, a digital value corresponding to the reference voltage V1 and the voltage dividing ratio (c) prestored in a ROM of the CPU circuit 101 to provide data on a correct engine speed.;COPYRIGHT: (C)2000,JPO