DIFF Subgroup
F02D 1/122 Full Title
Controlling fuel-injection pumps, e.g. of high pressure injection type (F02D3/00 takes precedence) > not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered > Transmission of control impulse to pump control, e.g. with power drive or power assistance > non-mechanical, e.g. hydraulic
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.