Ems Injection System; Introduction - Malaguti SPIDER MAX GT 500 Manual Diagnóstico

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B
SPIDER MAX 500

EMS INJECTION SYSTEM

1.

INTRODUCTION

The injection system is of the integrated injection and ignition system type.
The injection is indirect into the intake manifold through electro-injector.
Injection and ignition are timed on the 4-stroke cycle by means of a phonic wheel splined to the camshaft control and a
reluctance change sensor.
Carburetion and ignition are managed according to the motor revolutions and the gas valve opening.
Further corrections are made according to the following parameters:
- Coolant temperature;
- Intake air temperature;
- Room pressure.
The system corrects the fuel supply at idling and cold engine by means of a stepper motor set on a by-pass circuit of the
gas valve. The central unit controls the stepper motor and the injector opening time, thus ensuring stability at idling
speed and correct carburetion.
In all operating conditions, the carburetion control depends on the changing of the injector opening.
The fuel supply pressure is kept constant in relation to the room pressure.
The supply circuit is made of:
- a fuel pump;
- a fuel filter;
- an injector;
- a pressure regulator.
The pump, filter and regulator are assembled inside the fuel tank by means of a single support.
The injector is connected by means of two quick coupling hoses that allows getting a continuous circulation, avoiding
thus that the fuel gets to its boiling point. The pressure regulator is fitted to the end of the circuit.
The fuel pump is operated by the EMS central unit which ensures a safe motorcycle operation.
The ignition circuit components are:
- H.T. coil;
- H.T. cable;
- Shielded cap;
- EMS central unit;
- Spark plug.
The EMS central unit controls the ignition with the optimal spark advance, thus ensuring the 4-stroke timing (ignition
occurs only during the compression phase).
The EMS injection-ignition system controls the engine operation by means of a preset program. Should any of the input
signals miss, a basic engine operation is ensured in order to allow the driver reaching the nearest service centre.
Obviously this is not possible in case the engine rpm/speed signal is missing or when the anomaly inthe control circuits
of the:
- fuel pump
- H.T. coil
- injector.
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