Abstract: A power system including a stoichiometric compression ignition engine in which a roots blower is positioned in the air intake for the engine to control air flow. Air flow is decreased during part power conditions to maintain the air-fuel ratio in the combustion chamber of the engine at stoichiometric, thus enabling the use of inexpensive three-way catalyst to reduce oxides of nitrogen. The roots blower is connected to a motor generator so that when air flow is reduced, electrical energy is stored which is made available either to the roots blower to temporarily increase air flow or to the system electrical load and thus recapture energy that would otherwise be lost in reducing air flow.

Abstract: The invention concerns a drive arrangement of a crop conveying and/or processing mechanism of a harvesting machine with an internal combustion engine (25) that is arranged to drive the crop conveying and/or processing mechanism through power transmission elements in a first operating mode in a first direction at a first speed, and a reversible motor (86) that is arranged to drive the crop conveying and/or processing mechanism in a second operating mode at a second speed in a second direction that differs from the first direction. The drive arrangement is also able to be driven in one or both of third and fourth operating modes.

Abstract: A baling machine for forming large cylindrical bales of hay has a gate which can be raised to enable a campleted bale to pass under it for discharge. The bale initially rests on a horizontal support which is biased by a compression spring to swing to a discharge position in which it forms a ramp down which the bale rolls onto the ground. The support is maintained in the horizontal position by a abutment bar on the gate during the time that the gate is closed, but is released on the gate opening. In this way energy from the bale is not used for swinging the ramp, so the bale tends to roll further so that it is properly clear of the gate so as not to interfere with the closing of the gate.