Introduction of ME1788-Motronic System

2.Introduction of ME1788-Motronic System

The biggest characteristic of ME1788-Motronic engine electronic control managerial system is to use the control strategy based on the torque and it is an updated platform based on Bosch ME7971 system.The main purpose of the control strategy based on the torque is to connect with a lot of different control objects together.The structure of ME1788 engine managerial system is shown in Fig.4.2.

1)Function Introduction

(1)Basic managerial functions of the engine using physical models

·System Structure Based on the Torque;

·Confirm the Cylinder Load by Intake Air Pressure Sensor/Air Flow Sensor;

·Improved Mixture Control Function Under Static and Dynamic Condition;

·Close-loop Control;

·Fuel Injection Cylinder by Cylinder;

·Ignition Timing,Including Control of Detonation Cylinder by Cylinder.

Fig.4.2 Schematic Diagram of ME1788 Engine Managerial System Structure

·Emission Control Function;

·Heating of Catalytic Converter;

·Carbon Canister Control;

·Idling Control;(https://www.daowen.com)

·Limp Home;

·Speed Transfer by Incremental System.

（2）Additional Function.

·Anti-theft Function;

·Connection Between the Torque and External System(Such as Transmission Mechanism or Vehicle Dynamic Control);

·Control Several Engine Parts;

·Provide the Interface of Matching,EOL-Program Tool and Maintenance Tool.

（3）OBD.

·Finish a Series of OBD Functions;

·A Managerial System Used to Diagnose the Functions.

2)Control Model Based on the Torque

In the ME1788 engine managerial system based on the torque,all the internal and external requirements of the engine are defined by the torque or efficiency of the engine,as shown in Fig.4.3.Transfer various requirements of the engine to the control variable of the torque or efficiency,which are first processed in the central module of torque requirement coordinator,and then ME1788 system prioritizes these contradictory requirements,performs the most important one,and gets the needed engine control parameters such as oil injection time and ignition timing by torque transfer module.The action of that control variable has no effect on other variables,which is the advantage of control system based on the torque.

Fig.4.3 ME1788 System Structure Based on the Torque

Similarly,when matching the engine,due to the variable independence of control system based on the torque,it’s only up to the engine data when matching the engine characteristic curve and MAP,and without interference of other functions and variables,the repeated demarcation is avoided,the matching process is simplified and the matching cost is lowered.