What causes weak injector pulse?
You could have bad injectors, a bad resistor box (unlikely as I haven’t ever seen a bad one unless someone else has), or a wiring issue. Like stated before the ECU controls the grounds. Meaning the ground circuit for the injectors goes directly to the ecu.
Can fuel injectors cause car not to start?
Vehicle Won’t Start or Struggles When Starting If the fuel injector is not delivering enough fuel to the engine system, this can cause the car to struggle when trying to turn over or not turn over at all (just cranks with no result). This can also cause the engine to stall due to the air-fuel ratio not being correct.
What determines injector pulse width?
Injector pulse width is the amount of time, measured in milliseconds (ms), that a fuel injector stays open (delivers fuel) during a cylinder intake cycle. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms.
What is the difference between the pulse width and the duty cycle of an injector?
The Injector Duty Cycle (IDC) is basically the percentage of time an injector is energised (open) during an engines cycle i.e. 0% IDC injector is off, and 100% IDC the injector is permanently open. The Injector Pulse Width is the time an injector is energised (open).
What is pulse width?
Pulse Width (PW) is the elapsed time between the rising and falling edges of a single pulse. To make this measurement repeatable and accurate, we use the 50% power level as the reference points. Pulse Repetition Interval (PRI) is the time between sequential pulses.
What is the difference between duty cycle and pulse width?
In electronics, duty cycle is the percentage of the ratio of pulse duration, or pulse width (PW) to the total period (T) of the waveform. For example, a signal (10101010) has 50% duty cycle, because the pulse remains high for 1/2 of the period or low for 1/2 of the period.
How do you find your pulse width?
Create a ratio that places the length of the cycle activity in the numerator and the length of the overall cycle in the denominator. Divide the numbers. Multiply the result by 100 percent. This yields the pulse width of the duty cycle.
How do you find the minimum pulse width?
Min pulse width check is to ensure that pulse width of clock signal is more than required value. Basically it is based on frequency of operation and Technology. Means if frequency of design is 1Ghz than typical value of each high and low pulse width will be equal to (1ns/2) 0.5ns if duty cycle is 50%.
Is pulse width the same as pulse duration?
The pulse duration is called the “pulse length”, and is measured in micro-seconds (one micro-second is one-millionth of a second). The pulse length is usually called the PULSE WIDTH in radar systems.
How do I know my duty cycle?
Set the digital multimeter (DMM) to measure frequency. The steps can vary by meter. Usually a multimeter’s dial will be turned to dc V and the Hz button is pressed. The DMM is ready to measure duty cycle when a percent sign (%) appears in the right side of the multimeter’s display.
What is a 100% duty cycle?
A 100% duty cycle simply means the compressor will deliver a consistent CFM and PSI the entire time the compressor is in use, which is different than being able to run continuously.
What is the difference between duty cycle and frequency?
Duty cycle: A duty cycle is the fraction of one period when a system or signal is active. A period is the time it takes for a signal to conclude a full ON-OFF cycle. Frequency: The rate at which something repeats or occurs over a particular period.
What is the rise time of a signal?
Rise time is the time taken for a signal to cross a specified lower voltage threshold followed by a specified upper voltage threshold. This is an important parameter in both digital and analog systems. In digital systems it describes how long a signal spends in the intermediate state between two valid logic levels.
How is rise time calculated?
For applications in control theory, according to Levine (1996, p. 158), rise time is defined as “the time required for the response to rise from x% to y% of its final value”, with 0% to 100% rise time common for underdamped second order systems, 5% to 95% for critically damped and 10% to 90% for overdamped ones.
What is a good rise time?
For a signal in the time domain, an important figure of merit is its rise time. This is typically the 10-90 or 20-80.
How do you measure the rise time of a signal?
A common method for performing these rise/fall time measurements is to look at a signal on an Oscilloscope, zoom in to the transition edges, put the cursors over the transition edges, and write down the time delta in a spreadsheet. This method takes about 30 minutes per signal.
Why does increased rise and fall time improve?
Note the much higher mobility of electrons vs. holes. The rise time at the output depends primarily on how fast the P channel device can turn on, and the fall time is determined primarily by how fast the N channel device can turn on.
What are the reasons for existence of rise time and fall time?
Conversely, fall time is the measurement of the time it takes for the pulse to move from the highest value to the lowest value. In a resistive circuit, rise time values are primarily due to stray capacitance and inductance, which cause a delay in voltage and/or current until the steady state is reached.