1. What is Injector Pulse Width?

Injector Pulse Width (PW) is the duration in milliseconds that a fuel injector remains open to deliver fuel to the engine. It's a critical parameter in engine management systems that affects fuel delivery and engine performance.

2. How Does the Calculator Work?

The calculator uses the injector pulse width equation:

Where:

• \( duty\_cycle \) — Fraction of time injector is open (0-1)
• \( RPM \) — Engine speed in revolutions per minute
• 120000 — Conversion factor (ms per minute divided by 2 for 4-stroke cycle)

Explanation: The equation calculates how long the injector should stay open based on engine speed and desired fuel quantity.

3. Importance of Pulse Width Calculation

Details: Accurate pulse width calculation ensures proper fuel delivery, optimal engine performance, fuel efficiency, and emissions control.

4. Using the Calculator

Tips: Enter duty cycle as a fraction (0-1) and engine RPM. Typical duty cycles range from 0.2 to 0.9 depending on engine load.

5. Frequently Asked Questions (FAQ)

Q1: Why is pulse width important?
A: It directly controls fuel quantity delivered to the engine, affecting air-fuel ratio, power output, and emissions.

Q2: What's a typical pulse width range?
A: Typically 1-20ms, varying with engine speed and load. Idle might be 1-3ms while WOT could be 10-20ms.

Q3: How does RPM affect pulse width?
A: Higher RPM means less time available per cycle, so pulse width generally decreases as RPM increases at constant load.

Q4: What's maximum safe duty cycle?
A: Generally 80-90% (0.8-0.9) to allow time for injector closing and prevent overheating.

Q5: How does this relate to fuel pressure?
A: Higher fuel pressure requires shorter pulse width for same fuel quantity. This calculator assumes constant pressure.