TTEC4843 Report:Inputs,outpits,closed loop,

REPORT


1 )Sensor inputs.

• Throttle Position Sensor (TPS)Its measured in Dc volts on multimeter . its measured when the engine is of but the key is still in the on position.   It measured the outputs of the voltage when the throttle closed. and when the throttle is wide open.  this shows that the TPS tells the computer how much air is flowing into the engine and what measurements its given

• MAP sensor: The MAP sensor provides readings to the E.C.U of the pressures inside the manifold which help to calculate air density and the engine's air flow mass.

• HO2S: The oxygen sensors supply the computer with a signal that indicates a rich or lean condition during engine operation. This input information assists the computer in determining the proper air/fuel ratio

• Coolant Tempature (THW or ECT):  Its Measured in DC volts on a multimeter, the THW (thermister water) measures the tempature of the coolant or water that is running through the engine.

• Crank Sensor (CKP):  The crank sensor is used to monitor the position or rotational speed of the crankshaft,  And this information is used by engine management systems to control ignition system timing and other engine parameters measured in AC

.

• MAF: ( Mass Air Flow Sensor) : the mass air flow sensors converts the amount of air drawn into the engine into a voltage signal. And the ECM needs to know intake air volume to calculate engine load. measured in ohms

• Camshaft position (CMP ) sensor:   The camshaft position is a sensor provides the camshaft position information and the signal, which is used by the Powertrain Control Module (PCM) powertrain control module   for fuel and timekeeping. measured in volts.

2) Actuators outputs

• Electronic spark timing ( EST ) The electronic spark timing control system is a reference timing pulse generated in going hand in hand with engine revolutions is delayed in accordance with a voltage supplied from a function generator and its desired spark timing to the engine. Measured in volts
• Echaust Gas Recirculation ( EGR ) Is a system is desgined to reduce the amount of oxides of nitrgen ( nox) created to the engine during operating periods that usually in high combustion tempertures. measured in ohms
• Idle Air Control ( IAC ):    The (ICA) idle air control on fuel injection vehicle. this valve is made that it allows air to bypass the throttle plate by increasing the idle speed. this valve is operated by an electric solenoid or motor. so the vehicle computer controls the amount of opening to regulate idle speed for varying the conditions such as cold air string and air conditioner compressor load. This measured by a multimeter ( ohms )
  

3)Relationship Between Inputs and Outputs:

•  when the TPS goes Up then the fuel injectors start spraying more fuel. 

4)Closed loop fuel control:        

• The fuel loop fuel control is a closed loop that’s operates by using one or more oxygen sensor to adjust the fuel mixture in the engine. By balancing the Air/fuel ratio to an ideal which is 14.7/1 that depends on the load and speed. for example if the ( throttle position sensor ) letting in more air that could affect the closed loop by letting it think the Air/fuel ratio is at a stable where it can actually be running more leaner.