...BTW your Bieber avatar is awesome.-Malone
No tach needed... the IP spits fuel with each revolution: with no pedal, a little at idle (e.g. 800rpm), same pedal at 2400rpm (engine braking)... 3x as much. The cc per injection doesn't change, but the number of spits does, and for nothing since you're braking.
OverrunWhen the vehicle descends a steep gradient, or when the accelerator pedal is released at high speeds (overrun), the engine is driven by the vehicle's inertia. The sliding sleeve responds by pressing against the starting and tensioning levers. Both levers move the shift the control collar to decrease delivery quantity; this process continues until the fuel-delivery quantity reflects the requirements of the "new" load factor, or zero in extreme cases. The response pattern of the variable speed governor described here is valid at all flow control lever positions, and occurs whenever any factor causes load or rpm to vary so substantially as to shift the control collar all the way to its WOT or "stop" end position.
Ok, that makes sense, but that would also mean that fuel consumption might not differ much between coasting and engine braking.From the Bosch book:QuoteOverrunWhen the vehicle descends a steep gradient, or when the accelerator pedal is released at high speeds (overrun), the engine is driven by the vehicle's inertia. The sliding sleeve responds by pressing against the starting and tensioning levers. Both levers move the shift the control collar to decrease delivery quantity; this process continues until the fuel-delivery quantity reflects the requirements of the "new" load factor, or zero in extreme cases. The response pattern of the variable speed governor described here is valid at all flow control lever positions, and occurs whenever any factor causes load or rpm to vary so substantially as to shift the control collar all the way to its WOT or "stop" end position.