The valves open a small amount during low engine speeds to achieve maximum fuel efficiency. The valves will open wider at higher engine speeds to achieve higher performance. What is this referring to: The new mechanism debuted in with the V6 3. The high power output with low emissions and fuel economy is largely contributed by the improvements in several areas:.
The i-VTEC technology is also integrated in Honda's hybrid vehicles to work in tandem with an electric motor. In Honda's Civic Hybrid, the 1. Aside from weight and friction reduction, the engine operates on either low-speed timing, high-output timing or 4-cylinder idling when the VCM system is engaged, each yielding better engine output upon varying driving conditions.
The Integrated Motor Assist, or IMA as it is commonly known, is Honda's hybrid car technology that uses a gasoline-electric drive system developed to achieve higher fuel economy and low exhaust emissions without compromising engine efficiency.
The IMA system uses the engine as the main power source and an electric motor as an assisting power during acceleration. It was first designed for the Honda Insight in , which combined the electric motor with a smaller displacement VTEC engine and a lightweight aluminum body with improved aerodynamics. Low emissions target was realized when the car achieved the EU The development of the IMA system is a result of optimizing the various technologies that Honda has built over the years, including the lean-burn combustion, low-emission engines, variable valve timing, high-efficiency electric motors, regenerative braking, nickel-metal hydride Ni-MH battery technology and the microprocessor control.
With the IMA system, the amount of energy regeneration during deceleration is optimized and friction is reduced. The recovered energy is used to supplement the engine's output during acceleration.
The IMA supports the engine during a low rpm normal driving range by utilizing the electric motor to generate a high-torque performance.
When the gasoline engine enters a higher rpm range, the electric motor ceases and power output is supplied by the VTEC engine. The assistance from the electric motor reduces the work of the gasoline engine, allowing the engine to be downscaled. This results in better mileage and reduces fuel consumption. The power from the electric motor is generated and conserved when the vehicle moves forward. When brakes are applied, the IMA system shuts off the engine and conserved power from the electric motor is utilized.
This minimizes vibration of the car body and saves fuel when the engine is idling. When the brakes are released, the electric motor will restart the engine. Honda operates two crash test laboratories to improve safety designs and technologies in their vehicles, [ citation needed ] resulting in the cars scoring five-star ratings in front and side crash tests.
The term is Honda's version of Electronic Stability Control ESC , [18] an active safety feature developed to correct oversteer and understeer by using several sensors to detect loss of steering control and traction while simultaneously braking individual wheels to help the vehicle regain stability.
ABS is an existing system that prevents the vehicle's wheels from locking up under braking, especially in slippery road conditions.
For the ABS to work, the system relies on the computed input from a steering angle sensor to monitor the driver's steering direction, the yaw sensor to detect the momentum of which the wheels are steering yaw rate , and a lateral acceleration g-force sensor to signal the changes in speed. At the same time, the TCS will prevent wheel slip during acceleration while the side-slip control stabilizes cornering when the rear or front wheels slip sideways during oversteer and understeer.
Controlling oversteer — During an oversteer, the rear end of the vehicle will spin out because the rotational speed of the rear wheels exceeds the front wheels. VSA will prevent the vehicle from spinning by braking the outer front wheel to produce an outward moment and stabilize the vehicle. Controlling understeer - During an understeer, the front wheels lose traction during cornering due to excessive throttle and this causes the speed difference between the left and front wheels to decrease.
When the vehicle steers outwards from the intended trajectory, VSA intervenes by reducing engine power and if necessary, also braking the inner front wheel [19]. Such collision safety is a result of specific impact absorption by the vehicle's body and frame. The structure of the car body is designed to absorb and disperse crash energy throughout the energy compartment. When impact absorption is maximised, the cabin intrusion is automatically minimised to effectively lessen injuries to both occupants and pedestrians.
To optimize front collision performance and reduce the impact when different sized vehicles collide, the G-CON technology is further developed to incorporate Advanced Compatibility Engineering, Honda's term for crash compatibility.
Honda Tuning Magazine. Free Shipping. Email address below and we'll send you a link to download the free Kindle. Dec 18, In a world of every increasing engine output, 1,plus horsepower is still big news; and from a 4 cylinder no less.
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