Fuel system
Fuel is supplied by a pump through a filter to each injector under pressure set by the fuel pressure regulator. Fuel is injected into the intake manifold in accordance with signals from the electronic control unit.
Air supply system
The air supply system provides the amount of air required for engine operation.
The amount of air entering the engine is determined by the throttle opening angle and the engine speed. The air flow passes the air filter, the throttle body passage and enters the upper part of the intake manifold, from where it is distributed to the engine cylinders. When the coolant temperature is low, the idle speed control valve opens and air enters the upper part of the intake manifold through the bypass passage in addition to the air passing through the throttle valve. Thus, even if the throttle valve is completely closed, air enters the upper part of the intake manifold, and therefore the idle speed increases. The upper part of the intake manifold reduces air flow pulsations.
Electronic control system
All engines are equipped with an electronic control system from HONDA, which controls fuel injection, ignition timing, diagnostics, etc. using an electronic control unit. The following functions are performed:
1. Fuel injection control. Various sensors detect air flow, engine crankshaft speed, as well as oxygen content in exhaust gases, coolant temperature, intake air temperature, atmospheric pressure, etc., and convert the received information into an electrical signal sent to the electronic control unit:
Based on these signals, the electronic control unit determines the required amount of fuel and controls the injectors. The volume of fuel supplied is regulated by the duration of the raised position of the injector shut-off needle.
2. Control of ignition timing angle.
The electronic control unit memory stores the values of the optimal ignition advance angle for all possible engine operating modes. Using signals from various sensors that monitor engine operating conditions, the electronic control unit generates pulses that control spark formation at strictly defined moments in time.
3. Idle speed control system.
The memory of the electronic control unit contains data on the optimal idle speed, corresponding to various conditions (for example, coolant temperature, air conditioning on/off, etc.). The sensor signals are sent to the electronic control unit, which controls the air flow through the bypass channel (in addition to the throttle valve) and regulates the idle speed in accordance with the specified value
4. Diagnostics.
The electronic control unit warns of a malfunction or abnormal operation via the "MALFUNCTION INDICATOR LAMP" ("CHECK ENGINE") indicator on the instrument panel. The malfunction is identified as a diagnostic code, which is stored by the electronic control unit.
5. Fail-Safe function.
In case of failure of any sensor, an emergency mode of operation is provided (to get to the nearest service station). In this case, the indicator "MALFUNCTION INDICATOR LAMP" lights up on the instrument cluster.
Refer to the original source on the website www.HondaBook.ru