Abstract: An exhaust gas cleaning system for an engineering vehicle, such as a hydraulic excavator, is capable of performing manual regeneration control of a regeneration fuel injector 40 that is started only under the following conditions: a manual regeneration starting switch 39 is enabled; an engine control dial 2 commands a low-speed idle revolution speed; and a gate lock lever 22 is switched to a second position B at which generation of control pilot pressures a through f by use of remote control valves 25, 26, and 27 is disabled. Even when the manual regeneration control is being executed, if the gate lock lever 22 is switched to a first position A, the manual regeneration control immediately ends. As a result, the manual regeneration control of a filter for collecting particulate matter included in the exhaust gas and the operation of the work system do not influence each other.

Abstract: This invention provides a traveling system for an engineering machine, adapted to limit a maximum traveling speed of the machine without causing decreases in engineering work efficiency or in accelerating performance during a start of traveling, and to improve fuel efficiency by suppressing a loss of engine output horsepower under the limited state of the maximum traveling speed. During fourth-gear shift control process, capacities of first and second hydraulic motors 23, 24 are controlled in coordinative form and the second hydraulic motor 24 has its minimum tilting amount limited to a tilting amount limit q2cmin. In addition, when a tilting amount of the first hydraulic motor 23 reaches a minimum tilting amount q1min, the engine 10 has its maximum engine speed limited to a first engine speed limit Ncmax1 (e.g., 1,800 rpm).

Abstract: An exhaust gas purification system for an engineering machine is capable of avoiding decreases in working efficiency during regeneration control by burning off a deposit of particulate matter from a filter efficiently during a work pause time. An operating section 17 of a display monitor 16 is used to set a work pause time and a work pause switch 13 notifies a vehicle body control unit 21 that the hydraulic excavator has entered a work pause state. In response, the vehicle body control unit 21 calculates the time required for a regenerating device to burn off the current amount of particulate matter deposited on the filter, and when the calculated time is longer than the preset work pause time, a regeneration controller 4a of an engine control unit 4 is activated, and a solenoid control valve 15 is switched to a closed position during the preset work pause time.

Abstract: Each time a starting process for a diesel engine 2 is conducted and before the diesel engine 2 is started, any differences of the pressures P1 and P2 detected by first and second pressure sensors 21 and 22, respectively, with respect to a predetermined reference pressure value Pref, are computed and stored as first and second correction values ?P1 and ?P2, and then a differential pressure P12 across a particulate filter in the diesel engine 2 is computed using the pressure detection results of the first and second pressure sensors 21, 22 and the first and second correction values ?P1, ?P2. Thus, use of simply constructed and highly durable sensors during the detection of the differential pressure existing across the filter allows accurate measurement of this differential pressure.

Abstract: A work machine gear shifting control device is capable of readily identifying the cause of failure in learning the clutch hydraulic pressure for operating a transmission clutch. A transmission gear shifting control section 46 is provided for each of clutches 61-65, and performs a learning process in which each of a plurality of handling processes learns the clutch hydraulic pressure for each of the clutches 61-65 and determines the clutch hydraulic pressure characteristic values for operating the individual clutches. Further, the transmission gear shifting control section 46 performs a learning monitoring process in each of the plurality of handling processes to formulate an error judgment, which indicates whether learning has failed in each of the plurality of subprocesses, and displays the result of the judgment.

Abstract: A clutch control device includes: a plurality of hydraulic clutches built into a transmission; a clutch switching pattern storage device in which a plurality of clutch switching patterns, each defining engage/release changeover timing with which the plurality of hydraulic clutches are engaged/released are stored in correspondence to individual speed change patterns adopted by the transmission; a clutch switching pattern selection device that selects a clutch switching pattern stored in the clutch switching pattern storage device in correspondence to a speed change pattern for the transmission at a time of speed change; and a hydraulic control device that executes hydraulic control for the plurality of hydraulic clutches in correspondence to the clutch switching pattern selected by the clutch switching pattern selection device.

Abstract: An antenna cable break detector used with a construction machine wireless communication apparatus to detect a break in an antenna cable. The antenna cable 4 includes a central wire 6 and an armor wire 7 that is positioned concentrically outside the central wire. One end of the central wire and the armor wire is connected to a communication device. The other end of the central wire is connected to an antenna 3. The other end of the armor wire is grounded. The antenna cable break detector has a direct current shutoff device that is connected to the armor wire to shut off the flow of direct current 15 from the armor wire to the communication device. There is also a current shutoff detection device that is connected to the armor wire to detect the shutoff of the flow of a direct current the armor wire.

Abstract: A shift control device for a work vehicle that has a stepped automatic transmission includes: a control device that controls an engine rotation rate at the work vehicle and the stepped automatic transmission; a forward/reverse switchover member that outputs a forward/reverse switchover command for the work vehicle; and an operation quantity detection device that detects an accelerator pedal operation quantity in the work vehicle is operated. As the forward/reverse switchover command is output via the forward/reverse switchover member, the control device executes forward/reverse switchover control for the stepped automatic transmission and also controls the engine rotation rate so as to decrease the engine rotation rate gradually to a target lower limit value selected to ensure that a reverse rotation of a turbine runner at a torque converter in the work vehicle does not occur.

Abstract: A work machine gear shifting control system provides gear shifting conditions for an automatic gear shifting mode in accordance with work site conditions. An area 62 of a display device 49 displays a permissible velocity setting range and setup operation guidance, and another area 64 shows guidance to indicate whether the setting is acceptable or unacceptable. When the traveling velocity falls within the permissible velocity setting range, the displayed guidance changes to indicate that the setting is acceptable. When, in this instance, an operator presses a setup switch 23 with desired timing, a transmission gear shifting control section 45 acquires the prevailing vehicle velocity and velocity ratio (or vehicle velocity), and stores adjustment values in an adjustment value storage section 43 so that the vehicle velocity and velocity ratio become the gear shifting control threshold values for normal gear shifting control (steps S535 to S545).

Abstract: A monitoring display system for use within a cab of an automotive vehicular construction machine to display on a monitor screen picture images of a dead angle monitor camera as a through-view in the back ground of superimposed picture images of instrumentation data indicating readings of various instruments on the machine.

Abstract: A monitoring display system for use within a cab of an automotive vehicular construction machine to display on a monitor screen picture images of a dead angle monitor camera as a through-view in the back ground of superimposed picture images of instrumentation data indicating readings of various instruments on the machine.