Speed change control system for a vehicle
A speed change control system includes a speed change control section for setting a speed change value of a stepless speed change device; a speed change operational tool for providing the speed change control section with a speed change command the stepless speed change device; a constant speed travel operational device for providing the speed change control section with a changing command for changing a constant speed mode speed change value which is a speed change value at the time of the constant speed mode, a shifting command for shifting to the constant speed mode and a departing command for departing from the constant speed mode; and a constant speed travel management section which causes the speed change control section to execute the constant speed mode with the constant speed mode speed change value, based on the shifting command from the constant speed travel operational device.
1. A speed change control system having a constant speed mode for causing a vehicle to travel at a constant speed, comprising:
a stepless speed change device for steplessly speed-changing a rotational power from an engine and outputting the speed-changed power;
a speed change control section for setting a speed change value of the stepless speed change device;
a speed change operational tool for providing the speed change control section with a speed change command;
a constant speed travel management section for causing the speed change control section to execute the constant speed mode; and
a constant speed travel operational device for providing the speed change control section with, as operational commands relating to the constant speed mode, a first operational command for shifting to the constant speed mode with using a current speed change value by the speed change operational tool as a constant speed mode speed change value, and a departing command for departing from the constant speed mode,
wherein the constant speed travel operational device provides the speed change control section with:
a third command for executing fine speed increase adjustment of the constant speed mode speed change value;
a fourth command for executing normal speed increase adjustment which provides a greater speed increase than the fine speed increase adjustment;
a fifth command for executing fine speed decrease adjustment of the constant speed mode speed change value; and
a sixth command for executing normal speed decrease adjustment which provides a greater speed decrease than the fine speed decrease adjustment.
2. A speed change control system according to claim claim 1 , wherein
the constant speed travel operational device is constituted of a single constant speed travel operational instrument that allows evaluation of at least six distinct operational states.
3. A speed change control system according to claim 2 , wherein
the constant speed travel operational instrument has four operational switch positions, and
wherein at least two levels of operational period are evaluated at each one of the operational switch positions.
4. A speed change control system according to claim 3 , wherein
the constant speed travel operational instrument comprises a seesaw type switch which provides two levels of operational positions in one direction, and further two levels of operational positions in the other direction, across and relative to a neutral position as a reference point to which the instrument is urgedly maintained.
5. A speed change control system having a constant speed mode for causing a vehicle to travel at a constant speed, comprising:
a stepless speed change device for steplessly speed-changing a rotational power from an engine and outputting the speed-changed power;
a speed change control section for setting a speed change value of the stepless speed change device;
a speed change operational tool for providing the speed change control section with a speed change command;
a constant speed travel management section for causing the speed change control section to execute the constant speed mode; and
a constant speed travel operational device for providing the speed change control section with, as operational commands relating to the constant speed mode, a changing command for changing a constant speed mode speed change value which is a speed change value at the time of the constant speed mode, a first operational command for shifting to the constant speed mode with using a current speed change value by the speed change operational tool as the constant speed mode speed change value, and a departing command for departing from the constant speed mode,
wherein the constant speed travel operational device is constituted of a single constant speed travel operational instrument, and
the constant speed travel operational instrument has a changing operational position for providing the speed change control section with the changing command by a predetermined speed change value unit, a shifting operational position for providing the speed change control section with the first operational command, and a departing operational position for providing the speed change control section with the departing command; and
wherein the constant speed travel operational instrument is capable of operational displacements in one direction and in the other direction, across and relative to a neutral position as a reference point to which the instrument is urgedly maintained,
a terminal end operational displacement position in the one direction is the shifting operational position,
a terminal end operational displacement position in the other direction is the departing operational position, and
a unit operational displacement position to the terminal operational displacement positions in the one direction and the other direction is the changing operational position.