What is combustion in an engine?

Combustion is the controlled burning of fuel inside the engine's cylinders.

How does hydrogen participate in combustion?

Hydrogen mixes with intake air and participates in the flame front during combustion.

Hydrogen Combustion — Neutral Engineering Overview

Combustion is the controlled burning of fuel inside an engine's cylinders, producing heat and expanding gases that drive the piston. This page is a neutral overview of how hydrogen interacts with diesel combustion, presented in a compatibility-only context.

Definition

What Is Combustion?

Combustion is the chemical process of fuel oxidation inside the combustion chamber. Fuel reacts with oxygen from the intake air, releasing heat. The resulting gas expansion acts on the piston through the power stroke.

In a diesel engine the process is compression ignition: air is drawn in and compressed until its temperature is high enough that injected fuel ignites without a spark. Fuel and air form a heterogeneous air–fuel mixture, a flame front develops through that mixture, and the burn generates the cylinder pressure that the engine converts into rotational work.

Compression ignition
Intake air is compressed until fuel injected near top dead centre ignites without a spark.
Air–fuel mixture
Diesel fuel and air mix inside the chamber rather than being premixed upstream.
Flame front
Ignition begins at multiple sites and the flame front travels through the mixture.
Pressure generation
Heat release raises cylinder pressure, which acts on the piston during the power stroke.

Neutral description

Hydrogen in Combustion

Hydrogen mixes with intake air

Gas introduced into the intake air path is carried into the cylinder with the intake charge.

Hydrogen participates in the flame front

Once ignition occurs, hydrogen present in the charge takes part in the flame front alongside the injected fuel.

Hydrogen is consumed during combustion

The hydrogen is consumed in the combustion event. Nothing is stored on board and no gas is accumulated.

This is a compatibility explanation only. No statement is made about performance, emissions, efficiency or fuel use.

Hardware format

PEM / SPE Pure-Water Electrolysis

Hydrogen from pure water

Proton-exchange-membrane (solid polymer electrolyte) electrolysis generates gas from purified water on demand.

No chemicals, no KOH

No potassium hydroxide, sodium hydroxide or other caustic electrolyte is used or handled. The consumables are purified water and a replaceable resin filter.

Diesel-only compatibility

The format described here applies to diesel engines. Petrol, gas and hybrid drivetrains are outside the scope of this overview.

No ECU changes

The unit is fitted as standalone hardware with its own supply and control. Engine management, ECU calibration and factory wiring looms are not altered.

No claims are made here about what fitting such hardware does to an engine. See how PEM/SPE electrolysis works for the process description.

Compatibility overview

Compatible Vehicle Categories

Safety & neutrality

Safety & Neutrality

This page provides compatibility information only. No performance, emissions, or efficiency claims are made.

Installation is hardware-only supply. Owners and operators remain responsible for how any fitted equipment is installed, inspected and used on their own vehicles, including any applicable state, territory or site requirements.

FAQ

Combustion FAQ.

What is combustion in an engine?: Combustion is the controlled burning of fuel inside the engine's cylinders.
How does hydrogen participate in combustion?: Hydrogen mixes with intake air and participates in the flame front during combustion.
Does this page make performance claims?: No. This page provides compatibility information only.
Is this diesel-only?: Yes.

4WD compatibility cluster

Hydrogen Combustion — Neutral Engineering Overview

What Is Combustion?

Compression ignition

Air–fuel mixture

Flame front

Pressure generation