For pilot injection, the control valve closes, as shown in FIG. Due to the limited amount of force applied to the valve by the solenoid and the elastic forces involved when the valve surface 30 engages the seat 28, the valve 26 tends to bounce, as illustrated between times t a and t b in FIG. Accordingly, the pilot injection charge is adversely affected. At time t b , the solenoid is de-energized so that the valve may open, and a spring not shown is operative to move the valve from its closed position to its normally open position shown in FIG.
However, when the valve reaches its open position at time t c , the lower surface 32 of the valve 26 will typically bounce against the top surface 34 of the valve stop 16 as a result of the limited force applied by the spring, and the elasticity of the contact between the valve 26 and the valve stop Accordingly, as shown in FIG. Once the bounce or rebound has stabilized, the control valve 26 will be re-closed between times td and te, as shown in FIG.
The valve bounce between times ta and tb, and between times tc and td, creates an undesirable delay between pilot injection and main injection. For example, between times tc and td, the valve must be stabilized prior to initiating re-closing for main injection, and this delay creates a large gap between pilot and main injection, which decreases the effectiveness of the pilot injection charge.
This time delay can involve an 11 degree cam rotation, as illustrated in FIG. Accordingly, waiting for a stable position of the valve at its closure and waiting until the rebound dies out before starting the second valve movement makes both pilot output and separation between pilot and main injection unacceptably long.
It is desirable to provide a method of reducing or eliminating valve bounce in a fuel injection system in a manner which enables reduction of separation between pilot and main injection for more efficient fuel burning.
The present invention overcomes the above-referenced shortcomings of prior art injection methods by re-energizing the solenoid immediately prior to the valve reaching the fully open position after pilot injection, whereby to facilitate movement of the valve toward the fully closed position for main injection immediately after the valve reaches the fully open position, thus preventing subsequent valve bounces and decreasing time lag between pilot and main injection.
More specifically, the present invention provides a method of preventing valve bounce in a diesel engine having a solenoid valve controlled fuel injection system, wherein the solenoid-actuated valve is movable between a fully closed position for injection and a fully open position preventing injection. The method includes: 1 energizing the solenoid for valve movement to the fully closed position for commencing pilot injection; 2 de-energizing the solenoid for valve movement toward the fully open position for discontinuing pilot injection; and 3 re-energizing the solenoid immediately prior to the valve reaching the fully open position, whereby to facilitate movement of the valve toward the fully closed position for main injection immediately after the valve reaches the fully open position, thus preventing subsequent valve bounces and decreasing time lag between pilot and main injection.
Alternatively, the present invention provides a method of preventing valve bounce including: 1 energizing the solenoid for valve movement toward the fully closed position for commencing pilot injection; 2 de-energizing the solenoid immediately prior to the valve reaching the fully closed position for pilot injection in order to facilitate movement of the valve toward the fully open position immediately after the valve has reached the fully closed position, thereby preventing subsequent valve bounces; and 3 re-energizing the solenoid to facilitate return movement of the valve toward the fully closed position for main injection after pilot injection.
In a further alternative embodiment, the method comprises both de-energizing the solenoid immediately prior to the valve reaching the fully closed position for pilot injection, and re-energizing the solenoid immediately prior to the valve reaching the fully open position.
Accordingly, an object of the present invention is to provide a method of reducing valve bounce in a solenoid-actuated fuel injection control valve. Another object of the present invention is to provide a method of reducing separation between pilot and main injection in a solenoid-actuated fuel injection control valve. The above objects and other objects, features, and advantages of the present invention are readily apparent from the following detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
The present invention is herein described with reference to FIGS. At time t 1 or earlier, depending on the delay time of the valve and the time required to build up the magnetic field, the control valve solenoid is energized for moving the control valve from the open position to the closed position for pilot injection. By leaving a comment you agree with the storage and handling of your data by this website.
You can learn more about how we handle you comment information in our Privacy Policy. We are using Akismet to reduce comment spam. Learn how they process your comment data. View All Events. Warning But there is a big problem; seat bouncing can kick your rear wheel higher than the front, which is where even the most adamant land lubber can learn from the timing you will need to have. Sweet Swing Now we are not talking about a big body movement; for a seat bounce your head might only move rearwards by less than a hands breadth.
Longer Legs Try to feel your rear suspension staying engaged all the way into the air. One Skill Fits All So where does this come in useful for the average punter. Leave a Reply Cancel reply Your email address will not be published. Thank you for Signing Up. All fields are required. Please correct the marked field s below. We respect your privacy and will never share your information.
Britannica English: Translation of bounce for Arabic Speakers. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of bounce Entry 1 of 2. E-mails got bounced back, and many phone calls never went through. Definition of bounce Entry 2 of 2. Examples of bounce in a Sentence Verb He was bouncing a tennis ball against the garage door. The winner bounced up and down with delight.
Her curls bounced as she jumped. He bounced the baby on his knee. She gave me a check for 20 dollars, but the check bounced , and I never got the money. He bounced a dollar check at the grocery store. Save This Word! Slang : Vulgar. Compare broad jump , high jump.
Also called breakover. Verb Phrases. We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms. Idioms about jump. Jump, leap, vault imply propelling oneself by a muscular effort, either into the air or from one position or place to another.
Jump and leap are often used interchangeably, but jump indicates more particularly the springing movement of the feet in leaving the ground or support: to jump up and down.
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