Hybrid Construction Equipment vs. Automobile Instantaneous Conceptual diagram of capacitor and power battery Capacitor Frequent use of large power
Construction equipment
Battery
Forklift
Automobile
Longer use of small power
Continuous power
Komatsu Hybrid HB205-1
Hydraulic
Electric
Hybrid Construction Equipment vs. Automobile Capacitor charge/discharge pattern （90 degree swing loading to dump truck ）
V e g a t l o v r o t i c a p a C
Time (sec.) Single cycle
Charge/discharge balances in a single cycle
Fuel Efficiency of Hydraulic Excavators (1) Due to the new electric-driven swing: Reduction of oil pressure loss Implementation of swing energy regeneration (2) Due to optimal control of engine and pump as well as engine assistance by generator motor: Low-speed engine matching Achieved super low-speed engine operation at deceleration (700rpm)
25-41% fuel reduction
Hybrid – Generator Motor Engine
r o t a r r e o n t e o G m
Engine Generator motor Pump
e u q r o T
Motor Assist
Engine Speed
Components of the Hybrid System
Electric swing motor & additional decelerator
Inverter and Ultra Capacitor
Fuel Efficiency and Reduction of C0 2
Fuel Consumption Rates by application
Fuel Savings Payback Analysis $25,000
r $20,000 a e Y r $15,000 e P s g n $10,000 i v a S $ $5,000
$19,500 $15,600 $11,700 $7,800
$1000
Diesel = $1.30 /ltr
1500
2000
Hours Per Year
2500
4
Comparison of Reduction in C0 2 (Exhaust Emissions) PC200 = 30 automobiles
