Yanmar Holdings

A work machine capable of preventing a display device from obstructing a forward visual field of an operator and an operation of a console part by the operator is provided. A hydraulic excavator as the work machine includes a driving section and a display device. The driving section includes a driver seat, a side window disposed on one side in a width direction of the driving section relative to the driver seat, and a console part disposed between the driver seat and the side window in the width direction. The display device is disposed facing the side window at a position at a predetermined distance above the console part.

A work machine capable of surely disposing a control device in limited space inside a driving section, improving accessibility from the driving section to the control device, and preventing a visual field of an operator sitting in a driver seat from being obstructed by the control device is provided.A hydraulic excavator as the work machine includes the driving section and the control device. The driving section includes a base part and the driver seat disposed on the base part. The control device is disposed in the base part on a front side of the driver seat.

[Problem] To avoid deterioration of an exhaust gas purification catalyst by suppressing influence of responsiveness of an apparatus. [Solution] An engine system comprises: an engine including a first fuel supplying portion that supplies a first fuel to a combustion chamber and a second fuel supplying portion that supplies a second fuel to the combustion chamber; an exhaust gas purification catalyst that is disposed in an exhaust passage of the engine and purifies components derived from the second fuel; a bypass passage that is connected to the exhaust passage and bypasses the exhaust gas purification catalyst; a control valve that adjusts a passage ratio of an exhaust gas of the engine through the exhaust gas purification catalyst and through the bypass passage; and a controller that controls the control valve; wherein a first mode in which the first fuel supplying portion is operated and a second mode in which operation of the first fuel supplying portion is stopped and the second fuel supplying portion is operated are provided to be selectable, and the controller controls the control valve to increase a passage ratio of the exhaust gas through the bypass passage when selection of the first mode is detected during operation in the second mode.

[Problem] To provide a travel control method for a work vehicle, a travel control program, a travel control system, and a work vehicle that can easily alleviate restrictions on a work site where a recovery process can be performed. [Solution] A travel control method for a work vehicle 1 includes causing a work vehicle 1 to automatically travel along a target path R10 in a work site, and performing a recovery process in a case where a deviation including at least one of a position deviation and an azimuth deviation of the work vehicle 1 with respect to the target path R10 exceeds a threshold when the work vehicle 1 enters the target path R10 from an entry position Pa1 of the target path R10. The recovery process is a process of moving the work vehicle 1 to a recovery position Pr1 where entry into the target path R10 can be started by reducing the deviation. In the recovery process, the distance from the entry position Pa1 of the target path R10 to the recovery position Pr1 is designated as a recovery distance L1, and the recovery position Pr1 is determined according to the recovery distance L1.

[Problem] To provide an aftertreatment system and an engine system in which exhaust gas purification performance is less likely to deteriorate. [Solution] An aftertreatment system 5 includes a connection path 71. The connection path 71 connects an exhaust port through which exhaust gas is discharged in an engine main body 2 and an SCR device 51. The connection path 71 includes a first path 711 and a second path 712 that have lengths in directions intersecting each other, and a coupling portion 713 that couples the first path 711 and the second path 712.

[Problem] To provide a control method of an aftertreatment system in which exhaust gas purification performance is less likely to deteriorate, a control program, an aftertreatment system, and an engine system. [Solution] A control method of an aftertreatment system 5 is a control method of the aftertreatment system 5 including a first SCR device 51, a second SCR device 52, a first reducing agent supply device 56, and a second reducing agent supply device 57. The first SCR device 51 is located on the exhaust path 28 through which the exhaust gas discharged from the engine main body 2 passes. The second SCR device 52 is located on the exhaust path 28 and on the downstream side of the first SCR device 51 in a flow direction of the exhaust gas. The first reducing agent supply device 56 supplies the reducing agent to the first SCR device 51. The second reducing agent supply device 57 supplies the reducing agent to the second SCR device 52. The control method of the aftertreatment system 5 includes individually controlling the supply amount of the reducing agent of each of the first reducing agent supply device 56 and the second reducing agent supply device 57.

[Problem] To provide an exhaust gas recirculation system in which engine deposits are less likely to be generated, an engine system, a control method of an exhaust gas recirculation system, and a control program.[Solution] An exhaust gas recirculation system 4 recirculates, as EGR gas, at least part of exhaust gas discharged from an engine main body 2 from an exhaust port 202 to an intake port 201 of the engine main body 2. The exhaust gas recirculation system 4 includes an EGR path 41, a cooling unit 43, a bypass path 44, and a control unit. The EGR path 41 connects the exhaust port 202 and the intake port 201 and allows the EGR gas to pass through the EGR path 41. The cooling unit 43 includes a cooling path 431 included in the EGR path 41 and cools the EGR gas passing through the cooling path 431. The bypass path 44 connects an inlet and an outlet of the cooling path 431. The control unit recirculates the EGR gas in a bypass mode in which the EGR gas is caused to flow through the bypass path 44 to bypass the cooling path 431 when a determination condition is satisfied.

[Problem] Provided is a control method, a control program, and a control system of a working machine, and a working machine capable of easily reducing time and effort of a user.[Solution] A control method of a working machine (working vehicle 1) is a control method of a working machine including a connection unit 80, the working machine that performs work in a work field. The connection unit 80 can connect a wired device 81 by wire, and can connect a wireless device 82 via an adapter 83 in place of the wired device 81. The control method includes discriminating whether a connected device connected to the connection unit 80 is the wired device 81 or the wireless device 82.

[Problem] To provide a working machine control method, a working machine control program, a working machine control system, and a working machine, in which operation is less likely to be hindered even in a low temperature environment.[Solution] A control method of a working machine 3 is a control method of the working machine 3 including an electric motor 41 driven by electric power of a battery 50 and a hydraulic pump 42 driven by the electric motor 41 and configured to supply hydraulic oil to a hydraulic actuator. This control method includes: driving the electric motor 41 at a steady rotation speed when a monitored temperature is in a normal temperature region; and setting an upper limit value of a rotation speed of the electric motor 41 to a regulated rotation speed lower than the steady rotation speed when the monitored temperature is in a low temperature region lower than the normal temperature region.

[Problem] Provided are a control method, a control program, and a control device capable of preventing occurrence of charge run-out in a work vehicle driven by electric power supplied from a power supply source.[Solution] A control device 113 includes: a travel processing unit 113d that causes a work vehicle 10 to travel by electric power charged in a battery 111e; and a work processing unit 113e that drives a work machine 12, provided in the work vehicle 10, by the electric power charged in the battery 111e, and stops the driving of the work machine 12 when the remaining charge of the battery 111e becomes less than a first threshold.