Swing control system for hybrid construction machine

• US 8,666,613 B2
• Filed: 12/15/2010
• Issued: 03/04/2014
• Est. Priority Date: 12/15/2010
• Status: Active Grant

• Current Assignee: Volvo Construction Equipment AB (Volvo AB)
• Original Assignee: Volvo Construction Equipment AB (Volvo AB)
• Inventors: Choi, Dong-Uk
• Primary Examiner(s): Mawari, Redhwan k
• Application Number:
  US13/993,155
• Publication Number:
  US 20130311054A1
• Time in Patent Office: 1,175 Days
• Field of Search: 701/50, 701/124, 180/336, 180/337
• US Class Current: 701/50
• CPC Class Codes: E02F 9/123 Drives or control devices specially adapted therefor E02F9/125 and E02F9/128 take precedence
• CPC Class Codes: E02F 9/2058 Electric or electro-mechanical or mechanical control devices of vehicle sub-units for vehicles in general B60W
• CPC Class Codes: E02F 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: E02F 9/265 with follow-up actions (e.g. control signals sent to actuate the work tool)

Abstract

A swing control system for a hybrid construction machine has a swing operating lever, an electric swing motor, a speed detection sensor which detects the rotary speed of a swing motor, a controller that calculates the driving speed of the swing motor by a swing operating signal created by the operation of the swing operating lever and by a detecting signal of the rotary speed, an inverter which drives the swing motor by a control signal from the controller, a swing inertia detector that detects the swing inertia of equipment and an inertia torque compensator which compares the torque compensation value in accordance with the equipment inertia, and outputs a calculated torque value for controlling the swing motor to the inverter.

Claims

1. A swing control system for a hybrid construction machine comprising:

a swing manipulation lever configured to output a swing manipulation signal that is proportional to a manipulation amount of the swing manipulation lever by an operator;

an electric swing motor configured to be driven in response to an electric control signal corresponding to the manipulation amount of the swing manipulation lever;

a speed detection sensor configured to detect a rotational speed of the swing motor;

a controller configured to calculate a driving speed of the swing motor based on the swing manipulation signal by the manipulation of the swing manipulation lever and a rotational speed detection signal, which is fed back thererto from the speed detection sensor;

an inverter configured to drive the swing motor based on a current value for control, which is applied thereto from the controller;

a swing inertia detector configured to detect a swing inertia of the machine, which varies depending on a change in position of a work apparatus and output a torque compensation value or a swing inertia detection signal corresponding to the torque compensation value according to the detected swing inertia of the machine; and

an inertia torque compensator configured to compare the torque compensation value according to the machine inertia that is outputted from the swing inertia detector with a torque value outputted from the controller, and output a calculated torque value for controlling the swing motor to the inverter.

2. The swing control system according to claim 1, wherein the swing inertia detection signal outputted from the swing inertia detector is transmitted to the inertia torque compensator by any one selected from an analog signal, a digital signal, a wire communication signal, and a wireless communication signal.

3. The swing control system according to claim 1, wherein the swing inertia detector (15) detects a position change value of each of hydraulic cylinders for the work apparatus in real time and detects the swing inertia of the machine using a combination of the detected position change values of the hydraulic cylinders.

4. The swing control system according to claim 1, wherein the swing inertia detector compares a speed feedback value and a current feedback value of the swing motor, which is fedback thereto from the rotational speed detection sensor to predict an acceleration value and a torque value of the swing motor, and then, transmits an inertia value to the inertia torque compensator while detecting the values in real time.