Explore chapters and articles related to this topic
Control of Motor Vehicle Emissions
Published in Wayne T. Davis, Joshua S. Fu, Thad Godish, Air Quality, 2021
Wayne T. Davis, Joshua S. Fu, Thad Godish
In the 1970s and early 1980s, most SI engines used suction-type carburetors to deliver a mixture of air and gasoline to the engine. These have been replaced with electronic fuel injection/ignition systems which are controlled by an electronic engine control unit (ECU) or as part of the powertrain control module (PCM). The ECU controls the fuel mixture, the idling speed, the ignition or spark timing, and, more recently, the valve timing. These injection systems have become progressively “smarter” at controlling the engine and have transitioned from throttle body injection (TBI) systems to multiple port fuel injection (PFI or MPI) systems to gasoline direct injection (GDI) systems where the fuel is injected directly into the engine rather than into the air being supplied to the engine.
Why Can’t a Building Think Like a Car? Information and Control Systems Opportunities in New Buildings
Published in Barney L. Capehart, Lynne C. Capehart, Paul J. Allen, David C. Green, Web Based Energy Information and Control Systems:, 2021
Barney L. Capehart, Lynne C. Capehart
Much of the technology and operational features of our new cars comes from the use of microprocessors and microcomputers. A new car may have as many as 50 separate microprocessors and 11 major computer-based systems. Some new luxury cars have up to 90 microprocessors. It is often said that a new car has more computer power in it than our first manned space capsule. Computer-based systems are found in the System Modules for new cars, and account for much of the engine performance, reduced emissions, sophisticated diagnostics, and many of our comfort and convenience features. The Engine Control Unit (ECU) is the most powerful computer in the car, and it has the demanding job of controlling fuel economy, emissions from the engine and the catalytic converter, and determining optimum ignition timing and fuel injection parameters. These computers, microprocessors and system modules greatly simplify the diagnostic job of finding problems with the car, and providing information on what kind of repair or replacement work is needed.
Why Can’t a Building Think Like a Car? Information and Control Systems Opportunities in New Buildings
Published in Barney L. Capehart, Timothy Middelkoop, Paul J. Allen, David C. Green, Handbook of Web Based Energy Information and Control Systems, 2020
Barney L. Capehart, Lynne C. Capehart
Much of the technology and operational features of our new cars comes from the use of microprocessors and microcomputers. A new car may have as many as 50 separate microprocessors and 11 major computer-based systems. Some new luxury cars have up to 90 microprocessors. It is often said that a new car has more computer power in it than our first manned space capsule. Computer-based systems are found in the system modules for new cars, and account for much of the engine performance, reduced emissions, sophisticated diagnostics, and many of our comfort and convenience features. The engine control unit (ECU) is the most powerful computer in the car, and it has the demanding job of controlling fuel economy, emissions from the engine and the catalytic converter, and determining optimum ignition timing and fuel injection parameters. These computers, microprocessors and system modules greatly simplify the diagnostic job of finding problems with the car, and providing information on what kind of repair or replacement work is needed.
Design of light weight exact discrete event system diagnosers using measurement limitation: case study of electronic fuel injection system
Published in International Journal of Systems Science, 2018
Piyoosh Purushothaman Nair, Santosh Biswas, Arnab Sarkar
Air enters into the intake manifold through the air cleaner, throttle body and air intake chamber of the ‘ Air Flow Subsystem’. The amount of air entering into the engine can be controlled by adjusting the position of the throttle valve present in the throttle body. This varying air intake volume can be measured by monitoring the pressure in the intake manifold. Fuel is pumped from the tank to the injector through the fuel filter and rail by an electric fuel pump which is controlled by a fuel pump relay (see the block named ‘Fuel Flow Subsystem’ shown in Figure 2). The pressure regulator located at the fuel rail maintains a constant fuel pressure across the fuel injector. The injector injects the fuel into the intake manifold where it is mixed with air and the resulting mixture flows into the engine cylinders for burning. The Electronic Control Unit (ECU) is responsible for monitoring and controlling different engine functions by taking as input, information from various sensors located at different parts of the engine. ECU determines the right ratio for the air-fuel mixture based on the engine's RPM and the volume of air in the intake manifold. It then signals the injector to deliver the correct fuel quantity. The block named ‘ Air-Fuel Ratio Control Subsystem’ shown in Figure 2 depicts this control behaviour of the ECU.
Performance comparison of biomethane, natural gas and gasoline in powering a pickup truck
Published in Biofuels, 2022
Pruk Aggarangsi, James Moran, Sirichai Koonaphapdeelert, Nakorn Tippayawong
The NGV fuel system consisted of a lightweight, durable Type II gas cylinder that came with the truck. The gas tank was placed on the cargo bed. An Electronic Control Unit (ECU) controls the fuel delivery and the appropriate ignition angle timing. This fuel system came as purchased, without any modification and had a full engine warranty.