Operation control system for automotive working vehicles

• US 5,103,951 A
• Filed: 09/13/1991
• Issued: 04/14/1992
• Est. Priority Date: 09/20/1990
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Osawa, Shigeru, Inui, Tsutomu
• Primary Examiner(s): Braun, Leslie A.
• Assistant Examiner(s): Whitelaw, Nicholas
• Application Number:
  US07/759,471
• Time in Patent Office: 214 Days
• Field of Search: 192/0.042, 192/0.044, 192/0.045, 192/0.046, 192/0.062, 192/0.09, 192/0.092, 180/53.1, 180/53.6, 180/273
• US Class Current: 477/36
• CPC Class Codes: B60K 17/28 characterised by arrangement, location, or type of power take-off
• CPC Class Codes: B60K 28/00 Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions for electrically-propelled vehicles B60L3/00; road vehicle drive control systems for purposes not related to the control of a particular sub-unit B60W30/00; drive control systems specially adapted for autonomous road vehicles B60W60/00
• CPC Class Codes: B60K 28/04 responsive to presence or absence of the driver, e.g. to weight or lack thereof

Abstract

An operation control system of an automotive working vehicle has a self-resetting switch as a switch for stationary operation and a self-holding circuit. The self-holding circuit is set by operating the self-resetting switch to a predetermined set state when the following predetermined conditions are satisfied: detection of a driver'"'"'s seat being unoccupied, detection of a transmission being in neutral, and detection of a PTO shaft for stationary operation being selected. In the predetermined set state of the self-holding circuit, the engine of the automotive working vehicle can operate even when a PTO clutch is engaged, provided that the above predetermined conditions are satisfied. In another form of the invention, the predetermined conditions further include detection of a parking brake being locked.

Claims

1. In an operation control system for an automotive working vehicle having an engine, a transmission, a plurality of PTO shafts including a PTO shaft for stationary operation, a PTO selector for selecting one of said plurality of PTO shafts, a PTO clutch which transmits, when it is engaged, a driving force from said engine to one of said plurality of PTO shafts selected by said PTO selector, and a driver'"'"'s seat, said operation control system having first detecting means for detecting whether or not said driver'"'"'s seat is occupied, second detecting means for detecting whether or not said transmission is in a neutral position, third detecting means for detecting whether or not said PTO clutch is engaged, fourth detecting means for detecting whether or not said PTO shaft for stationary operation has been selected out of said plurality of PTO shafts by said PTO selector, and engine operation-holding means for holding said engine in operation, when said first detecting means detects that said driver'"'"'s seat becomes unoccupied at least under conditions that said third detecting means has detected that said PTO clutch is disengaged and said second detecting means has detected that said transmission is in said neutral position,

the improvement comprising:

a self-resetting switch as a switch for stationary operation; and

a self-holding circuit which is set, when said self-resetting switch is operated in a state where a first condition that said first detecting means has detected that said driver'"'"'s seat is unoccupied, a second condition that said second detecting means has detected that said transmission is in said neutral position, and a third condition that said fourth detecting means has detected that said PTO shaft for stationary operation has been selected out of said plurality of PTO shafts by said PTO selector, are satisfied, to a predetermined set state which enables said engine to operate even when said third detecting means detects that said PTO clutch is engaged in said state where said first to third conditions are satisfied, said predetermined set state of said self-holding circuit being cancelled when at least one of said first to third conditions ceases to be satisfied.

2. In an operation control system for an automotive working vehicle having an engine, a transmission, a plurality of PTO shafts including a PTO shaft for stationary operation, a PTO selector for selecting one of said plurality of PTO shafts, a PTO clutch which transmits, when it is engaged, a driving force from said engine to one of said plurality of PTO shafts selected by said PTO selector, a driver'"'"'s seat, and a parking brake, said operation control system having first detecting means for detecting whether or not said driver'"'"'s seat is occupied, second detecting means for detecting whether or not said transmission is in a neutral position, third detecting means for detecting whether or not said PTO clutch is engaged, fourth detecting means for detecting whether or not said PTO shaft for stationary operation has been selected out of said plurality of PTO shafts by said PTO selector, fifth detecting means for detecting whether or not said parking brake is locked, and engine operation-holding means for holding said engine in operation, when said first detecting means detects that said driver'"'"'s seat becomes unoccupied at least under conditions that said third detecting means has detected that said PTO clutch is disengaged and said second detecting means has detected that said transmission is in said neutral position,

the improvement comprising:

a self-resetting switch as a switch for stationary operation; and

a self-holding circuit which is set, when said self-resetting switch is operated in a state where a first condition that said first detecting means has detected that said driver'"'"'s seat is unoccupied, a second condition that said second detecting means has detected that said transmission is in said neutral position, a third condition that said fourth detecting means has detected that said PTO shaft for stationary operation has been selected out of said plurality of PTO shafts by said PTO selector, and a fourth condition that said fifth detecting means has detected that said parking brake is locked, are satisfied, to a predetermined set state which enables said engine to operate even when said third detecting means detects that said PTO clutch is engaged in said state where said first to fourth conditions are satisfied, said predetermined set state of said self-holding circuit being cancelled when at least one of said first to fourth conditions ceases to be satisfied.