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Ignition and starter systems
Published in M.J. Nunney, Light and Heavy Vehicle Technology, 2007
A manifold absolute pressure (MAP) sensor may be used for signalling engine load to the electronic control unit, by responding either to depression with a naturally aspirated engine or to pressure in the case of a turbocharged one, and supplying this information in the form of a voltage signal. Alternative methods of signalling the engine load are to utilize the air flow and air mass meters employed with electronic fuel injection systems (Section 6.7), as part of a combined fuel and ignition engine management system.
Sensors
Published in Allan W. M. Bonnick, Automotive Computer Controlled Systems, 2007
The accurate measurement of manifold pressure plays an important part in engine control strategies and the MAP sensor is the device that does this. MAP sensors are available in several different forms. However, there are two types that are commonly used. One of these gives a variable voltage output to represent manifold absolute pressure, and the other uses the frequency of a digital signal to represent it.
Engine systems
Published in Tom Denton, Automobile Mechanical and Electrical Systems, 2018
On many systems MAP sensor signals are used by the ECU to calculate the fuel requirements (Fig. 2.244). These systems do not have an air flow meter. The signals from manifold absolute pressure, engine speed, air charge temperature and throttle position sensors are compared in the ECU to calculate the injector pulse width.
Active learning-assisted semi-supervised learning for fault detection and diagnostics with imbalanced dataset
Published in IISE Transactions, 2023
Xiaomeng Peng, Xiaoning Jin, Shiming Duan, Chaitanya Sankavaram
An air intake system is one of the most critical components in an automotive engine. There are three critical embedded sensors in the system for measuring the amount of air and enabling continuous airflow into the engine: Mass Air Flow (MAF) sensor, Throttle Position Sensor (TPS) and Manifold Absolute Pressure (MAP) sensor. The MAF sensor determines the mass flow rate entering the engine. In the air intake system, the throttle body controls the amount of air flow into the engine. A TPS monitors the throttle plate position. An MAP sensor provides the intake manifold pressure information to the electronic control unit.