2.5.1. General information
Main characteristics of system
The system of the distributed injection of fuel consists of sensors by means of which the condition of the engine, the electronic control unit the engine (engine-ECU) which is carrying out functions of management on the basis of signals of sensors, and the actuation mechanisms working on commands of the control unit is registered.
Management of injection of fuel (toplivopodachy)
The system of supply of the fuel, used on Mitsubishi Motors cars, is designed so that to provide an exact dosage of fuel which provides the best combination between the received capacity, fuel profitability and low level of toxicity of the fulfilled gases.
In systems of supply of fuel, the electronic control unit the engine receives signals from the corresponding sensors and operates fuel nozzles so that to provide the best structure of an air and fuel mix on various modes of the engine. At change of operating modes, the fuel system immediately to them is arranged.
The moment of the beginning of opening of a nozzle and duration of its open condition are set so that in the engine the toplivovozdushny mix of optimum structure corresponding to continuously changing operating conditions of the engine arrived. The nozzle is established on an inlet branch pipe of each cylinder. Fuel moves the fuel pump from a fuel tank in a fuel collector under the pressure which size is supported by a pressure regulator. In a fuel collector fuel, under a certain pressure, is distributed to each nozzle. In normal conditions injection of fuel is carried out once for two turns of a cranked shaft for each cylinder.
The control unit makes management of fuel injection, frequency of rotation idling and a corner of an advancing of ignition. Besides, the control unit has a number of the diagnostic operating modes, allowing to simplify search of malfunctions.
Operating procedure of cylinders 1-3-4-2. This mode is called as consecutive injection of fuel. The electronic control unit provides enrichment of a toplivovozdushny mix at engine warming up, and also at work with the maximum loading, exercising administration without feedback on structure of a mix («open-loop»).
If the engine is heated-up or works at partial modes, the control unit provides maintenance stekhiometrichesky (fuel theoretically necessary for full combustion) structure fuel - an air mix, carrying out feedback control («closed-loop») on mix structure with use of signals of the oxygen sensor. Thanks to it maximum efficiency of work of three-componental catalytic converter is provided.
Regulation of additional air (management of frequency of rotation of idling)
The electronic control unit the engine supports optimum turns of idling depending on external conditions and load of the engine, regulating amounts of the air arriving in the engine through the bypass channel bypassing a butterfly valve. The control unit the engine operates the servo-driver of a regulator of idling (ISC), providing maintenance
the set frequency of rotation depending on temperature of cooling liquid and loading from the conditioner. Besides, at inclusion and the switching off of the conditioner made on a mode of idling, the step-by-step electric motor of a regulator of idling (ISC) doses out amount of additional air so that to exclude fluctuations of frequency of rotation of a cranked shaft.
Regulation of a corner of an advancing of ignition
Connected to primary chain of the coil of ignition the power transistor closes and disconnects a chain. Thus, optimum administration of a corner of an advancing of ignition according to power setting is exercised.
The electronic control unit determines by the engine an optimum angle of an advancing of ignition depending on frequency of rotation of a cranked shaft of the engine, a volume consumption of the air arriving in the engine, temperatures of cooling liquid and atmospheric pressure.
At emergence of malfunctions in work of one of sensors or the drives relating to systems of decrease in toxicity of fulfilled gases, on a guard of devices the control lamp of indication of malfunction of the engine («CHECK ENGINE») lights up, warning the driver about malfunction.
If the electronic control unit registers malfunction in work of one of sensors or drives, the block gives out the corresponding diagnostic code of malfunction.
Written down in random access memory (RAM) of the electronic control unit the data relating to sensors and drives (malfunction codes), it is possible to consider by means of MUT-II. Besides on a certain operating mode of MUT-II, probably compulsory management of drives.
Other functions of management
Management of the fuel pump turns on the relay of the fuel pump which submits a current to the pump electric motor.
The management of the relay of the conditioner switches on and off the relay of the electromagnetic coupling of the compressor of the conditioner.
The management of the relay of the fan regulates frequency of rotation of the fan of a radiator of system of cooling and the fan of a kondensor of the conditioner depending on temperature of cooling liquid and speed of the car.
For ensuring effective combustion, the system of ignition should set fire to an air and fuel mix in the engine cylinder at some point. Chosen the right time ignitions guarantees that being allocated thermal energy and pressure developed in the cylinder as result of combustion, are liberated during the optimum moment according to position of the piston. The electronic control unit the engine receives signals from the corresponding sensors and operates the ignition moment.
Control system of a consumption of air
The control system of a consumption of air consists of system of measurement of a consumption of air and a control system of idling turns. The system of measurement of a consumption of air provides optimum adjustment of a stream of air at car movement in usual conditions with a way of change of provision of a butterfly valve.
The control system of turns of idling regulates a consumption of air through admission system at completely closed butterfly valve. This system supervises frequency of rotation of the engine and the provision of a butterfly valve along with other entrance sizes.
Control system of toxicity of the fulfilled gases
Control systems of toxicity of the fulfilled gases are necessary for control of the content of hydrocarbons (SN), моноксида carbon (WITH), and nitrogen (NOx) oxides. On cars of Mitsubishi Motors firm the following systems reducing emission of harmful components in fulfilled gases are established.
System of compulsory ventilation of a case (PCV)
Gases from the combustion chamber through piston rings get to an engine case. These filtered gases (bloW-by gases) are harmful, at hit in the air atmosphere.
The valve of compulsory ventilation of a case (PCV valve) is a basic element of this system, it passes karterny gases in an inlet collector where they, mixing up with an air and fuel mix, go to the chamber of combustion of the engine.
Catching system паров fuels
The catching system паров fuels accumulates pairs of fuel which contain high concentration of hydrocarbons (SN) and arrive from a fuel tank in an accumulative adsorber.
Pairs of fuel keep in it until they will not mix up with air on an admission and will not burn down in the chamber of combustion of the engine.
System of a retsirkulyatsiya of the fulfilled gases (EGR)
The system of a retsirkulyatsiya of the fulfilled gases on some power setting selects a part of the fulfilled gases from a final collector and sends them to an inlet collector for decrease in temperature in the combustion chamber.
Oxides of nitrogen (NOx) are formed in gases as result of combustion of mixes at high temperatures.
Catalytic converter helps to lower the maintenance of harmful components, being, in fact, the second chamber of combustion. The catalyst helps to carry out chemical reactions to prolong dogoraniye processes in the fulfilled gases that essentially reduces the maintenance of harmful components in them. Catalytic converter works especially effectively at observance of certain proportions of an air and fuel mix.
For control of work of a control system by toxicity of the fulfilled gases, on some models the car the system of onboard diagnostics (OBD) is established.