VEHICLE SPEED CONTROL APPARATUS OF INDUSTRIAL VEHICLE

• US 20150081191A1
• Filed: 09/16/2014
• Published: 03/19/2015
• Est. Priority Date: 09/18/2013
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki (Toyota Motor Corporation)
• Inventors: KATO, Norihiko, KOIDE, Yukikazu
• Granted Patent: US 9,897,018 B2
• Time in Patent Office: Days
• US Class Current: 701/99
• CPC Class Codes: F02D 2041/0022 for diesel engines by throttle control
• CPC Class Codes: F02D 2041/1409 using at least a proportional, integral or derivative controller
• CPC Class Codes: F02D 31/001 Electric control of rotation speed
• CPC Class Codes: F02D 31/006 for maximum speed control
• CPC Class Codes: F02D 31/009 for maximum speed control
• CPC Class Codes: F02D 41/10 for acceleration

Abstract

A vehicle speed control apparatus of an industrial vehicle has a controller that determines a target engine speed by PI control based on a deviation between a target vehicle speed and an actual vehicle speed. The controller controls an upper limit of the target engine speed according to an actual engine speed.

Claims

1. A vehicle speed control apparatus of an industrial vehicle, comprising:

a controller that determines a target engine speed by PI control based on a deviation between a target vehicle speed and an actual vehicle speed, the controller controlling an upper limit of the target engine speed according to an actual engine speed.

2. The vehicle speed control apparatus of an industrial vehicle according to claim 1, further comprising:

a P gain increase calculation section that calculates a P gain increase value;

a P term calculation section that calculates a P term based on the P gain increase value and the deviation between the target vehicle speed and the actual vehicle speed; and

an I term calculation section that calculates an I term based on the deviation between the target vehicle speed and the actual vehicle speed.

3. The vehicle speed control apparatus of an industrial vehicle according to claim 1, wherein the industrial vehicle includes a diesel engine.

4. A vehicle speed control apparatus of an industrial vehicle, comprising:

a controller that determines a target engine speed by PI control based on a deviation between a target vehicle speed and an actual vehicle speed, the controller setting a sum of the actual engine speed and a value α

as the target engine speed, the value α

being set to 10% of the actual engine speed or less.

5. The vehicle speed control apparatus of an industrial vehicle according to claim 4, wherein the industrial vehicle includes a diesel engine.