Info on the Electronic Power Steering (EPS) system:
Operativity and the linearity were raised rapidly,
Worldwide beginning, "new EPS*(electromotive power steering)
+VGR*(variable steering gear ratio)".
The steering wheel is the part where it has always touched when driving, because of that without having an influence on the disturbance and the like being faithful to only the will of the driver is most required. HONDA so far, although maturing the hydraulic power steering is advanced adopted EPS which aims toward handling and steering feeling which in NSX are suitable in the midship sport car. EPS of this new development while considering the quality of the FF car in the base, the technology which is cultivated so far as a system for the car promoting improvement. Completing the world first new EPS+VGR combining new mechanism VGR, as a car. Furthermore the system which to the last assists steering wheel operation faithfully to the will of the driver was actualized e.g., you can obtain the steering quality of the taste with mode change function.
* EPS=Electric POWER Steering
* VGR=Variable Gear Ratio
* New EPS which achieves the substantial evolution and the energy conservation of steering feeling.
Assisting handling vis-a-vis the steering wheel operation of the driver, with the driving force of the rack axis and the electric motor which is installed in the same axis. The computer to be fast and controls the assist quantity which responds to vehicle speed and steering state in high accuracy, optimizing the driving force of the motor. Linear assist power is generated the speed which cuts the steering wheel (revolution rudder speed) vis-a-vis, furthermore it is smooth and steering feeling whose responsiveness is high is actualized. In addition, after making simple and lightweight hard part constitution, because the motor directly assists the rack axis with computer control, the power loss due to engine drive in comparison with the hydraulic pump system quite is little, high efficiency the system is actualized.
Preservation rudder power change on the steering wheel by the kick back
- To make fine control possible at the high speed by the computer, improvement the smoothness of control force.
- External force from the tire to be difficult to be transmitted to the steering wheel by the fact that it denies by assist power of the motor, the kick back substantially decrease.
Simultaneously decreasing torque steering which makes the FF car peculiar.
The high-speed travelling time and decreasing the steering wheel rotational oscillation when braking.
Controlling taking the steering wheel which it occurs on the wheel track road and the snow-covered road etc..
- Return characteristic of the steering wheel is optimized, achieving comfortable steering feeling e.g., even at when accelerating after the revolving smooth handling is made possible.
[ Energy-saving environmental correspondence/relieved function ]
- Be able to delete the hydraulic pump and oil, because it can decrease also engine load loss substantially, fuel economy 3 - 5% improvements (company internal test value).
- With simple structure, achieving the light weight conversion of the system.
- Guaranteeing power assist even at the abrupt engine stall time.
- Engine starting characteristic improvement at time of low temperature.
- Warning function and self diagnostic function, self protection functional attaching
* Furthermore adopting VGR where you can obtain steering feeling which feeling is good.
VGR which converts the feed per revolution of the rack & the pinion variably by the fact that it changes angle of obliquity of action and angle of torsion and module of rack tooth profile to linear, changes gearing pitch circle diameter. It provides usual ratio in the center section of the rack gear, the steering wheel starts cutting smoothly, at the time of the large position of a vessel's helm quick as a ratio setting the lock to lock decreasing. As a result, lane modification and the like with high-speed travelling being smoother, acquiring steering feeling which has the sense of relief. In addition, with low-speed travelling, actualizing the easy routing characteristic at maneuverability and the time etc. of the garage inserting when it makes brisking. By the fact that it combines to new EPS, a higher quality is shown.
*gear ratio quality
It can select steering feeling according to taste of the driver and travelling circumstance,
EPS mode change function.
As for new EPS because it is possible, to set control force quality freely, being able to give the various qualities which are agreeable to the taste of the driver it is possible. Then, the ‚ß, setting the mode of the ‚ß heavily lightly in addition to usual mode. By the fact that the selector switch which is installed in the instrument panel is operated, it can obtain the control force quality which responds to the taste of the driver.
Mode switch
+: Plus mode... the response which is done a little heavily securely with the ‚ß
-: Normal mode... linear balance comes off responsiveness
-: Negative mode... being light, pliant Æ’eÆ’CÆ’XÆ’g
Linear Mode
