Komatsu Corporation

Kazuyoshi Morimoto

Hiroshi Yamashita

Kozo Okuda

Tadashi Mori

Hiroshi Sawada

Hayato Matsumoto

Jin Yogita

Eiji Morinaga

Takanori Hata

Huzhe Yang

Gary Ryan

A work vehicle having a plurality of working modes allowing working in accordance with a load state includes an engine, an exhaust gas purification apparatus, a reducing agent tank, a state determination portion, and an engine control unit. The exhaust gas purification apparatus purifies a nitrogen oxide in an exhaust gas. The reducing agent tank stores a reducing agent. The state determination portion determines a state of the reducing agent. The engine control unit controls output of the engine with the use of a restricted-operation engine output torque curve in which horsepower output from the engine is lower than horsepower output from the engine at the time when each of the plurality of working modes is selected, when a state of the reducing agent is equal to or lower than a reference value.

Work vehicle

A work vehicle includes an engine, an exhaust gas purification apparatus, a reducing agent tank, an engine coolant circuit, a branch path, a valve, an accepting portion, and a valve control unit. The exhaust gas purification apparatus purifies a nitrogen oxide in an exhaust gas. The reducing agent tank stores a reducing agent to be supplied to the exhaust gas purification apparatus. The engine coolant circuit includes a water pump for circulating a engine coolant through a circulation path as the engine is driven. The branch path is provided for heat exchange between the engine coolant and the reducing agent in the reducing agent tank. The valve controls supply of the engine coolant into the branch path. The accepting portion accepts an operation instruction from an operator. The valve control unit gives an instruction for an opening operation of the valve in response to the operation instruction from the operator.

An exhaust processing unit includes a selective catalytic reduction apparatus which processes exhaust from an engine. A reducing agent injection apparatus is attached to the exhaust processing unit. The reducing agent injection apparatus injects a reducing agent which is supplied to the selective catalytic reduction apparatus. The reducing agent tank and the reducing agent supply pump are arranged outside the engine compartment. The reducing agent tank retains the reducing agent. The reducing agent supply pump supplies the reducing agent from the reducing agent tank to the reducing agent injection apparatus. The reducing agent pipe connects the reducing agent supply pump and the reducing agent injection apparatus. The revolving frame includes a pipe frame. The reducing agent pipe is arranged from the reducing agent supply pump to the reducing agent injection apparatus so as to pass through the inner space of the pipe frame.

Hydraulic excavator

In a crawler construction machine including an engine and a fuel adjustment dial that adjusts a speed of the engine according to operation loads of the working equipment, the fuel adjustment dial is a rotary notchless dial that is continuously variably adjustable. The crawler construction machine includes: an adjustment position detector that detects a rotation adjustment position of the fuel adjustment dial; an engine controller that is connected to the adjustment position detector and controls the speed of the engine based on an adjustment position of the fuel adjustment dial; and a display device that is connected to the engine controller and displays on a screen a percentage value of the adjustment position of the fuel adjustment dial in which the maximum rotation position of the fuel adjustment dial is defined as 100%.

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Hirakata, Japan

Kazuyoshi Morimoto