Basics 6 min read
Control modes for fuel control
The engine control system is responsible for controlling fuel and ignition for all possible engine operating conditions. However, there are…
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Basics 3 min read
Digital engine control features
The primary purpose of the electronic engine control system is to regulate the mixture (i.e., air–fuel), the ignition timing, and…
Basics 1 min read
Digital engine control
A typical engine control system incorporates a microprocessor and is essentially a special-purpose computer (or microcontroller). Electronic engine control has…
Basics 1 min read
Digital engine control systems
Traditionally, the term powertrain has been thought to include the engine, transmission, differential, and drive axle/wheel assemblies. With the advent…
Basics 2 min read
Compression-ratio
In an engine cylinder, the gas molecules are moving about at considerable speed in the space occupied by the gas,…
Basics 1 min read
Engine cylinder capacity
Engine sizes are compared on the basis of total cylinder swept volume, which is known as engine cylinder capacity. Thus…
Basics 2 min read
Engine power
Power is the rate of doing work. When applied to engines, power ratings may be calculated either on the basis…
Basics 1 min read
Engine torque
This is the turning-effort about the crankshaft’s axis of rotation and is equal to the product of the force acting…
Basics 1 min read
Engine-performance terminology
To enable intelligent comparisons to be made between different engines’ ability to pull or operate at various speeds, we shall…
Basics 1 min read
Crankcase disc-valve and reed-valve inlet charge control
An alternative to the piston-operated crankcase inlet port is to use a disc-valve attached to and driven by the crankshaft…
Basics 1 min read
Reverse-flow (Schnuerle) scavenging
To improve scavenging efficiency, a loop-scavenging system which became known as the reverse-flow or (after its inventor, Dr E. Schnuerle)…
Basics 1 min read
Piston-engine cycles of operation
The internal-combustion engine The piston engine is known as an internal-combustion heat-engine. The concept of the piston engine is that…