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Honda Announces Development of New Honda Hybrid System Featuring 3-Stage i-VTEC + IMA
 Date: July 05, 2005 10:41
 Submitted by:  JeffX
 Source: Honda PR
 Credibility Rating: Not Specified

New Civic Hybrid powerplant scheduled for fall 2005 introduction

TOKYO, Japan, July 5, 2005 - Honda Motor Co., Ltd. announced that it has developed a New Honda Hybrid System, which features a 3-stage i-VTEC engine that employs Honda’s intelligent VTEC (Variable Valve Timing and Lift Electronic Control) system to provide three stages of valve timing (low-rpm, high-rpm, and cylinder idle mode), combined with Honda’s IMA (Integrated Motor Assist) system that has been made significantly more compact and efficient. The New Honda Hybrid System will be introduced in the all-new Civic Hybrid, to be launched this fall.

New Honda Hybrid System
(3-stage i-VTEC + IMA)
cut-away model

The New Honda Hybrid System employs intelligent engine functions and a more efficient IMA system to achieve an approximate 20% increase in system output over the current system1 and the powerful performance of a 1.8-liter engine while improving fuel economy by 5%2, reducing the system size by 5% and attainting a world-leading level of emissions performance. The system offers significantly improved performance and fuel economy over the current system.
1 Current Civic Hybrid system
2 Compared to current Civic Hybrid when driven in 10-15 mode

The 3-stage i-VTEC engine employs three hydraulic pathways to couple and uncouple five rocker arm assemblies, providing three stages of valve control depending on the driving conditions to achieve a combination of responsive driving and fuel economy. During deceleration when the cylinders are idle, combustion in all four cylinders is halted and the cylinders sealed shut, reducing pumping losses caused by engine aspiration for a 10% improvement in recovery of braking energy compared to the current model3. Virtually everything possible has been done to reduce friction as well, including the use of aluminum die-cast pistons, which feature low thermal expansion for less friction under high-temperature conditions, ion-plated piston rings, and plateau honing of the cylinder walls for a smoother surface.
3 Current Civic Hybrid

Honda’s independently developed electric motor employs coils with high-density windings and high-performance magnets to attain output 1.5 times that of the current model while maintaining the same size. The inverter used to control motor speed—also independently developed and manufactured by Honda—is integrated with the motor’s ECU for more precise digital control, contributing to even greater motor efficiency and fuel economy. Battery output has been increased by around 30% over the current model3, while a more compact, custom designed battery storage box offers increased cooling performance and vibration resistance for improved long-term reliability.

Also, a dynamic regenerative braking system is employed that hydraulically controls the brakes based on the amount of brake regeneration. This permits maximum braking regeneration along with smooth deceleration that conforms to brake-pedal pressure. The air conditioner features a hybrid compressor that is powered by both the engine and the motor. When the engine is in Idle Stop mode the compressor is powered by the motor; if rapid cooling is required it is powered by the engine and motor combined. When the temperature is stable it runs off the motor alone, for both improved comfort and fuel savings.

New Honda Hybrid System Modes of Operation

  • Vehicle stationary
    The engine is turned off and fuel consumption is zero.
  • Startup and acceleration
    The engine operates in low-speed valve timing mode, with motor assist.
  • Rapid acceleration
    The engine operates in high-speed valve timing mode, with motor assist.
  • Low-speed cruising
    The valves of all four of the engine’s cylinders are closed and combustion halted. The motor alone powers the vehicle.
  • Gentle acceleration and high-speed cruising
    The engine operating in low-speed valve timing mode powers the vehicle.
  • Deceleration
    The valves of all four of the engine’s cylinders are closed and combustion halted. The motor recovers the maximum amount of energy released during deceleration and stores it in the battery.

Specifications for the New Honda Hybrid System

Power source Engine Engine type and
number of cylinders
Water-cooled in-line 4-cylinder
Displacement (cc) 1,339
Bore × stroke(mm) 73.0 × 80.0
Electric motor Electricmotor type AC synchronous drive (Ultra-thin DC brushless motor)
Rated voltage (v) 158
Performance Engine Max. output
(kW [PS]/rpm)
Max. torque
(N·m [kg·m]/rpm)
Electric motor Max. output
(kW [PS]/rpm)
Max. torque
(N·m [kg·m]/rpm)
Max. output
(kW [PS])
70+15[95+20] (=~115hp)
Max. torque
(N·m [kg·m])
167[17.0] (=~123 lb-ft)

*All values are based on Honda in-house calculations

Specifications* for the New Honda Hybrid System (from US Honda PR, released 6 July 2005)

Power source Engine Engine type and Number of cylinders Water-cooled in-line 4-cylinder
Displacement (cc) 1,339
Bore x stroke (mm) 73.0 x 80.0
Electric motor Electric motor type AC synchronous drive (Ultra-thin DC brushless motor)
Rated voltage (v) 158
Performance Engine Max. output
Max. torque
Electric motor Max. output
Max. torque
(Engine +
Electric Motor)
Max. output
(horsepower /rpm)
Max. torque
(lb-ft. @ rpm)

*All values according to Honda in-house calculations
**Horsepower and torque calculations reflect new SAE J1349 procedures revised August, 2004

Honda Dreamers TV Video Clip
NOTE: It seems that a bandwidth cap on the Honda site makes smooth playback of these latest video clips impossible

Last edited by JeffX on July 06, 2005 15:16

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Date Subject User
07-05-2005 17:13 Honda Hybrid now a "Full Hybrid?"   (Score: 1, Normal) mentaloriental
07-05-2005 17:23 corey415
07-09-2005 06:45 watermelonman
07-05-2005 17:28 penguin
07-05-2005 23:09 Varmint
07-06-2005 00:46 WongKN
07-06-2005 13:31 Jonavin
07-06-2005 13:47 Varmint
07-11-2005 18:13 Sledge
07-12-2005 01:41 Wizard
07-09-2005 06:54 watermelonman
07-06-2005 09:45 FNJ
07-06-2005 13:01 Trip
07-06-2005 19:43 2 spark plugs?   (Score: 1, Normal) ipribadi
07-06-2005 23:29 Wizard
07-11-2005 13:38 bref
07-11-2005 16:23 Wizard
07-06-2005 00:41 Available in 5-speed?   (Score: 1, Normal) runman27
07-06-2005 11:05 Paulbrownz
07-07-2005 10:35 runman27
07-07-2005 11:55 mininsx
07-08-2005 11:58 Dren
07-08-2005 12:19 crv16
07-08-2005 16:03 runman27
07-11-2005 14:49 jcn02acc
07-11-2005 15:49 Jerry Murray
07-09-2005 08:24 Torque Comparison with other 1.3 l. rotory in RX8   (Score: 1, Normal) voyageur
07-09-2005 12:45 Blak_CRX_VT
07-09-2005 13:13 voyageur
07-09-2005 17:41 Dren
07-10-2005 10:25 voyageur
07-05-2005 13:54 Worried about Acceleration for Safety sake.......please help..   (Score: 1, Normal) Acura Type S'in
07-05-2005 14:11 Paulbrownz
07-05-2005 14:21 Acura Type S'in
07-05-2005 17:09 mentaloriental
07-05-2005 17:21 Acura Type S'in
07-05-2005 17:44 mentaloriental
07-05-2005 22:02 Acura Type S'in
07-05-2005 22:20 WongKN
07-06-2005 13:43 TonyEX
07-06-2005 17:36 JeffX
07-07-2005 10:00 Acura Type S'in
07-07-2005 10:51 Wizard
07-06-2005 16:25 HXer
07-06-2005 18:51 Wizard
07-06-2005 20:08 WongKN
07-07-2005 01:34 ipribadi
07-07-2005 08:19 WongKN
07-07-2005 15:23 HXer
07-07-2005 16:25 6SPDTL
07-07-2005 18:29 Wizard
07-08-2005 11:57 Dren
07-06-2005 10:33 anybody else having playback problems with the movie clip?   (Score: 1, Normal) JeffX
07-06-2005 10:47 Blak_CRX_VT
07-06-2005 11:07 Paulbrownz
07-06-2005 11:10 argod
07-06-2005 12:20 JeffX
07-06-2005 13:33 Varmint
07-06-2005 15:38 argod
07-06-2005 21:09 kiwikungfu
07-07-2005 22:34 WongKN
07-07-2005 23:02 argod
07-08-2005 01:27 WongKN
07-08-2005 02:30 WongKN
07-08-2005 10:46 argod
07-07-2005 10:16 Please explain torque numbers?? 88 engine, 103 electric = 191 right??   (Score: 1, Normal) Acura Type S'in
07-07-2005 10:21 WongKN
07-07-2005 10:32 Acura Type S'in
07-05-2005 14:50 Storage of battery pack   (Score: 1, Normal) tmkarab
07-05-2005 15:27 garfield134
07-05-2005 17:54 Paulbrownz
07-05-2005 22:42 garfield134
07-05-2005 22:56 Varmint
07-05-2005 23:01 kiwikungfu
07-06-2005 12:40 tmkarab
07-06-2005 12:44 tmkarab
07-06-2005 12:50 tmkarab
07-06-2005 13:36 Varmint
07-06-2005 18:42 tmkarab
07-06-2005 18:53 Wizard
07-07-2005 09:39 Varmint
07-07-2005 08:18 Sledge
07-05-2005 22:22 insight?   (Score: 1, Normal) kiwikungfu
07-06-2005 11:28 Dren
07-06-2005 12:02 JeffX
07-06-2005 12:40 carquaker
07-06-2005 21:15 kiwikungfu
07-06-2005 15:18 Notice higher torque figure in US specifications   (Score: 1, Normal) JeffX
07-06-2005 15:48 Wizard
07-05-2005 11:40 MPG?   (Score: 1, Normal) Dren
07-05-2005 12:14 notyper
07-05-2005 12:35 enemy
07-05-2005 13:50 Varmint
07-05-2005 14:29 enemy
07-05-2005 14:51 Dren
07-05-2005 22:40 Varmint
07-06-2005 11:27 Dren
07-05-2005 13:04 zapata
07-05-2005 13:44 Varmint
07-06-2005 01:19 Why no i-VTEC I   (Score: 1, Normal) ipribadi
07-06-2005 09:33 RayChuang
07-05-2005 12:22 Convert to HP and TQ?   (Score: 1, Normal) mininsx
07-05-2005 12:40 Paulbrownz
07-05-2005 12:50 seasofcheese
07-05-2005 13:05 mininsx
07-05-2005 13:02 zapata
07-05-2005 13:07 Danielrh
07-05-2005 13:05 Danielrh
07-05-2005 13:09 JeffX
07-05-2005 13:20 mininsx
07-05-2005 13:39 Varmint
07-05-2005 13:45 tmkarab
07-05-2005 13:47 Szklanny
07-05-2005 14:02 notyper
07-05-2005 17:57 Paulbrownz
07-05-2005 23:46 mininsx
07-05-2005 13:21 Share the wealth!   (Score: 1, Normal) morph1ne
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