Exhaust gas cleaning system for engineering vehicle

During automatic regeneration, the gate lock lever (5) may be in a locked state and work may be not performed. In such a case, when exhaust gas temperature is lower than the threshold value, temperature-rising assistance is started. The minimum engine output PS1 (pump discharge pressure P1 and pump discharge amount Q1) is brought to engine output PS2 (pump discharge pressure P2 and pump discharge amount Q2). In this way, a hydraulic load is applied to an engine to thereby increase exhaust gas temperature. In a case where the work is resumed during the regeneration, when an operator pulls down the gate lock lever (5) to the first position A, the engine output PS2 is returned to the minimum engine output PS1 (pump discharge pressure P1 and pump discharge amount Q1). Thus, the temperature-rising assistance is stopped. Even if the temperature-rising assistance is stopped, the automatic regeneration is continued.