Work vehicle

• US 10,215,117 B2
• Filed: 07/22/2015
• Issued: 02/26/2019
• Est. Priority Date: 07/24/2014
• Status: Active Grant

• Current Assignee: Yanmar Power Technology Co., Ltd. (Yanmar Holdings Co., Ltd.)
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Ueda, Ryouhei
• Primary Examiner(s): Holmes, Justin
• Application Number:
  US15/306,955
• Publication Number:
  US 20170045009A1
• Time in Patent Office: 1,315 Days
• Field of Search: None
• CPC Class Codes: A01B 63/008 Vertical adjustment of tools A01B63/10 takes precedence
• CPC Class Codes: A01B 71/02 Setting or adjusting mechanisms
• CPC Class Codes: B60K 17/08 of mechanical type
• CPC Class Codes: B60K 17/28 characterised by arrangement, location, or type of power take-off
• CPC Class Codes: B60K 23/00 Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for movable cabs having special adaptations of vehicle control devices B62D33/06; such control devices per se F16D, F16H
• CPC Class Codes: B60K 2360/168 Target or limit values
• CPC Class Codes: B60K 2360/61 Specially adapted for utility vehicles
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60K 35/215 characterised by the combination of multiple visual outputs, e.g. combined instruments with analogue meters and additional displays
• CPC Class Codes: B60K 35/28 characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
• CPC Class Codes: B60K 35/60 Instruments characterised by their location or relative disposition in or on vehicles arrangements of lighting devices on dashboards B60Q3/10
• CPC Class Codes: B60R 2300/207 using multi-purpose displays, e.g. camera image and navigation or video on same display
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 2050/0026 Lookup tables or parameter maps
• CPC Class Codes: B60W 2050/0027 Minimum/maximum value selectors
• CPC Class Codes: B60W 2050/146 Display means
• CPC Class Codes: B60W 2510/30 Auxiliary equipments
• CPC Class Codes: B60W 2540/215 Selection or confirmation of options
• CPC Class Codes: B60W 30/1888 Control of power take off [PTO]
• CPC Class Codes: B60W 50/14 : Means for informing the driver, warning the driver or prompting a driver intervention
• CPC Class Codes: B60Y 2200/221 : Tractors
• CPC Class Codes: B60Y 2300/1888 : Control of power take off [PTO]
• CPC Class Codes: B62D 49/0692 : characterised by the particular arrangement of control devices, e.g. having more than one control stand, operable from vehicle extension (control devices or systems characterised by mechanical features only)
• CPC Class Codes: F02D 31/007 : controlling fuel supply
• CPC Class Codes: F02D 41/021 : Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/0215 : in relation with elements of the transmission
• CPC Class Codes: F02D 41/04 : Introducing corrections for particular operating conditions F02D41/14 takes precedence
• CPC Class Codes: F02D 41/3005 : Details not otherwise provided for
• CPC Class Codes: F16H 2059/6815 : Post shift value of gearing, i.e. calculated or estimated parameters after shift is completed, e.g. estimated output torque after shift is performed
• CPC Class Codes: F16H 2061/0218 : Calculation or estimation of the available ratio range, i.e. possible gear ratios, e.g. for prompting a driver with a display
• CPC Class Codes: F16H 2063/426 : with means for advising the driver for proper shift action, e.g. prompting the driver with allowable selection range of ratios
• CPC Class Codes: F16H 63/50 : Signals to an engine or motor

Abstract

In a work vehicle according to the present invention, a control device calculates, for each of a plurality of speed-changing stages in a PTO transmission, an expected maximum rotational speed of PTO rotary power that is output from the PTO shaft when an engine rotational speed changing operation member is operated to a maximum extent, and shows, in a listed manner, the calculated results in a liquid crystal display part of a display device. The present invention can inform an operator of the maximum rotational speed of PTO rotary power that is output from the PTO shaft for each speed-changing stage in the PTO transmission without performing a speed changing operation on the PTO transmission.

Claims

1. A work vehicle, comprising:

an engine configured to output power that has a rotational speed corresponding to an operation on an engine rotational speed changing operation member;

a traveling-system transmission disposed in a traveling-system power transmission path from the engine to travel members and configured to perform a speed change action corresponding to an operation on a traveling-system speed changing operation member;

a multi-stage power take off (PTO) transmission disposed in a working-system power transmission path from the engine to a PTO shaft and configured to perform a speed change action corresponding to an operation on a PTO speed changing operation member; and

a display device having a liquid crystal display part and a control device,

wherein the control device is configured to;

calculate, for each of a plurality of speed-changing stages in the PTO transmission, an expected maximum rotational speed of PTO rotary power that is output from the PTO shaft when the engine rotational speed changing operation member is operated to a maximum extent, and

show the calculated results, so as to correspond to each of the plurality of speed-changing stages, in the liquid crystal display part in a listed manner.

2. The work vehicle according to claim 1, further comprising:

an engine rotational speed upper limit setting member and a traveling-mode switching operation member,

wherein;

the control device is configured to store a plurality of engine rotational speed upper limit values that are set by the engine rotational speed upper limit setting member; and

the control device is configured such that, in a state in which an output rotational speed of the engine when the engine rotational speed changing operation member is operated to a maximum extent is limited to one engine rotational speed upper limit value that is made effective by the traveling-mode switching operation member;

the control device activates and controls a fuel injection device that supplies fuel to the engine to cause an output rotational speed of the engine to arrive at a rotational speed corresponding to an amount of operation on the engine rotational speed changing operation member; and

the control device calculates the expected maximum rotational speed of PTO rotary power for each speed-changing stage in the PTO transmission based on the effective engine rotational speed upper limit.

3. The work vehicle according to claim 1, further comprising:

a PTO clutch that is disposed in the working-system power transmission path and is configured to connect or disconnect power from the engine to the PTO shaft in response to an operation on a PTO ON-OFF operation member,

wherein, when the PTO ON-OFF operation member is operated for ON, the control device is configured to cause the liquid crystal display part to shift to a PTO rotational speed display screen that shows the expected maximum rotational speeds of PTO rotational power of respective speed-changing stages in the PTO transmission in a listed manner.

4. The work vehicle according to claim 1, further comprising:

a display switching operation member that is capable of being manually operated,

wherein, in response to a predetermined operation on the display switching operation member, the control device causes the liquid crystal display part to shift to a PTO rotational speed display screen that shows the expected maximum rotational speeds of PTO rotational power of respective speed-changing stages in the PTO transmission in a listed manner.

5. The work vehicle according to claim 1, further comprising:

a PTO rotational speed sensor that detects an actual rotational speed of the PTO shaft, wherein

the control device causes the liquid crystal display part to also show the actual rotational speed of the PTO shaft based on the PTO rotational speed sensor when showing the expected maximum rotational speeds of PTO rotational power of respective speed-changing stages in the PTO transmission.

6. A work vehicle, comprising:

an engine rotational speed changing operation member;

an engine configured to have a rotational speed corresponding to an operation on the engine rotational speed changing operation member;

a multi-stage power take off (PTO) transmission disposed in a working-system power transmission path from the engine to a PTO shaft and configured to perform a speed change action corresponding to an operation on a PTO speed changing operation member; and

a control device configured to calculate a plurality of expected maximum rotational speed values, the plurality of expected maximum rotational speed values include, for each of a plurality of speed-changing stages in the PTO transmission, a corresponding expected maximum rotational speed of PTO rotary power that is expected to be output from the PTO shaft responsive to maximum operation of the engine rotational speed changing operation member, and

a display device configured to concurrently display each value of the plurality of expected maximum rotational speed values.

7. A work vehicle, comprising:

an engine rotational speed changing operation member;

an engine configured to have a rotational speed corresponding to an operation on the engine rotational speed changing operation member;

a multi-stage power take off (PTO) transmission disposed in a working-system power transmission path from the engine to a PTO shaft and configured to perform a speed change action corresponding to an operation on a PTO speed changing operation member; and

a display device configured to concurrently display each value of a plurality of expected maximum rotational speed values,

wherein the plurality of expected maximum rotational speed values include, for each of a plurality of speed-changing stages in the PTO transmission, a corresponding expected maximum rotational speed of PTO rotary power that is expected to be output from the PTO shaft responsive to maximum operation of the engine rotational speed changing operation member.