Enhanced aftertreatment apparatus regeneration using spatially controlled hydrogen-rich gas

1) Regeneration system comprising:

• an exhaust aftertreatment unit fitted to the exhaust of an internal combustion engine;
• and
• a fuel reformer providing hydrogen-rich gas to the aftertreatment unit so as to obtain spatially selective regeneration of the aftertreatment unit;
• and
• including a hydrogen-rich gas switchbox having associated valves and plumbing for controlling the flow of hydrogen-rich gas, wherein the valves in the switchbox are used to direct the flow of hydrogen-rich gas to the appropriate plumbing to regenerate the associated section of the aftertreatment unit.