| 摘要 |
PROBLEM TO BE SOLVED: To change exhaust gas into clean state by injecting urea water in response to work state of a tractor.SOLUTION: A tractor having a Diesel engine E and urea selection catalyst reduction [SCR] system is constituted in such a way that there is provided harvesting depth detection means 86 of a rotary 21 installed at a rear part of the tractor and an injection amount of urea water is increased as a harvesting depth of the rotary 21 becomes deep. In addition, the tractor having the Diesel engine E and urea selection catalyst reduction [SCR] system is also constituted in such a way that there is provided PTO speed change position detection means 87 for selecting the number of rotation of PTO shaft of the rotary 21 installed at the rear part of the tractor and an injection amount of urea water is increased as a speed change position of the PTO speed change position detection means 87 becomes a high speed side.SELECTED DRAWING: Figure 10 |
