Controles eletrônicos do motor – Funcionamento do sistema e componentes

Electronic Engine Controls – 2.5L Duratec-HE (122kW/165PS) 303-14A-8 303-14A-8 - MI4 DESCRIPTION AND OPERATION for the prevailing manifold absolute pressure at the various load states. The IAT sensor element also sends an analog voltage signal to the PCM. The temperature range (falling temperature characteristic) of the IAT sensor is from -40 ºC (nominal resistance approx. 48 kOhms) to 130 ºC (nominal resistance approx. 85 Ohms). At an intake air temperature of 20ºC, the nominal resistance is 2.5 kOhm +/- 5%. The analog voltage signals are digitized in the analog-to-digital converter and transmitted to the microprocessor as numerical values (counts). Use of the MAPT signal: Electronic Throttle E135525 The ECM uses the electronic throttle to help regulate engine torque. The electronic throttle is attached to the intake manifold. For additional information, refer to: Intake Air Distribution and Filtering (303-12 Intake Air Distribution and Filtering - 5.0L NA V8 - AJ133, Description and Operation). The throttle plate is operated by an electric DC (direct current) motor integrated into the throttle body. The ECM uses a PWM signal to control the DC motor. The ECM compares the APP sensor inputs against an electronic request or value to determine the required position of the throttle plate. The ECM and electronic throttle are also required to: • Monitor requests for cruise control operation • Automatically operate the electronic throttle for accurate cruise control • Perform all dynamic stability control engine interventions • Monitor and carry out maximum engine speed and road speed cut outs • Provide different engine maps for the ride and handling optimization system. A software strategy within the ECM calibrates the position of the throttle plate at the beginning of each ignition cycle. When the ignition is turned on, the ECM performs a self test and calibration routine by fully closing the throttle plate and then opening it again. This tests the default position springs and allows the ECM to learn the fully closed position. Camshaft position (CMP) sensor E135526 A sensor is installed for the intake camshaft. The CMP sensor is used by the PCM for cylinder number one recognition so that the injection sequence can be determined. Based on the calculated camshaft position and information about the crankshaft position, the PCM is able to determine the correct ignition timing and the correct injection timing for each individual cylinder. Also it can accurately identify a cylinder that is showing a tendency to knocking combustion The CMP sensor is realized as a Hall effect sensor and is provided by the PCM with a 5 volt supply. The Hall effect sensor emits a signal when the pulse segments incorporated into the sensor wheel rotate past the tip of the sensor. Thanks to the composition of the pulse segments, and combined with the signals from the CKP sensor, the PCM is able to calculate the position of the individual camshafts at any time. If an increase occurs in the area of the sensor, the PCM receives a 'low' signal with a maximum voltage of 0.5V. If a gap occurs in the area of the sensor, a 'high' signal is sent to the PCM. In this case the voltage is approx. 4.5V. If the CMP sensor fails, the fault is stored in the fault memory of the PCM and knock control is deactivated.