Sensor Washing Pressure Control With Delayed Nozzle Distribution
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Solution Overview
Problem
The inefficiency in achieving the required discharge pressure of a fluid for sensor cleaning due to hydraulic pressure loss and the time required for the pump to generate the desired pressure, leading to degraded cleaning performance and increased cleaning time.
Innovation Solution
An apparatus and method that control the discharge pressure of a fluid by setting different drive motor duties based on the amount of water and the degree of contamination of the sensor, and forcibly delaying the operation of the distributor during pump operation to compensate for hydraulic pressure loss, ensuring the fluid reaches the required discharge pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the pump operates immediately to inject fluid for sensor cleaning, then the cleaning process can start without delay, but the fluid cannot reach the required discharge pressure due to hydraulic pressure loss and pump startup time
Solution Approach 1:
The controller delays the opening of the distributor for a predetermined period after the pump starts operating. This preliminary delay allows the pump to build up sufficient fluid pressure before the distributor opens and fluid begins flowing through the injection system, ensuring that the required discharge pressure is achieved at the nozzle despite hydraulic pressure losses in the fluid path.
2Speed
If the distributor is opened immediately when the pump operates, then the fluid can be delivered to the sensor without delay, but the discharge pressure is insufficient due to hydraulic pressure loss in the fluid path
Solution Approach 1:
The controller implements a timing sequence where the pump is activated first and operates for a predetermined delay period before the distributor is opened. This preliminary pump operation builds up the necessary fluid pressure in the system before fluid flow is initiated through the distributor, ensuring that when the distributor opens, the fluid is delivered at the required discharge pressure despite the delay in fluid delivery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach minimizes system inefficiency and reduces washing time by compensating for hydraulic pressure loss, achieving efficient sensor cleaning by ensuring the fluid reaches the necessary pressure for effective cleaning.
Implementation Method 1
the pump compresses the fluid through an impeller in an initial function thereof, thereby creating a hydraulic pressure
Implementation Method 2
the fluid is a viscous fluid and, as such, hydraulic pressure loss of the fluid is inevitably generated due to viscosity until the fluid is discharged to the nozzle after operation of a pump
Data Source
AI summary
An apparatus for controlling a discharge pressure of a fluid includes: a pump configured to suck the fluid through an inlet or to discharge the sucked fluid through an outlet; a distributor connected to the pump and to an injection nozzle provided by a sensor and configured to distribute the fluid discharged from the pump to the sensor; and a controller. The controller is configured to control the pump to operate selectively in accordance with detection of contamination of the sensor and to control operation of the distributor to be forcibly delayed during operation of the pump such that the fluid distributed to the sensor, when detected as being contaminated, is controlled to reach a selected required discharge pressure of different required discharge pressures selected in accordance with water amount information and a degree of contamination of the sensor.