Orbital Pump Temperature Adaptation for Exhaust Additive Metering
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Solution Overview
Problem
Pumps used to deliver liquid additives for exhaust gas purification in vehicles face issues with freezing at low temperatures and inaccurate metering, leading to excessive consumption and potential pollutant escape.
Innovation Solution
An orbital pump design with a deformable element and eccentric mechanism that adapts delivery based on temperature and angular position to ensure accurate metering and prevent freezing, using a temperature sensor and control unit to adjust operation parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pump delivers liquid additive at low temperatures, then the liquid can freeze and impair the apparatus, but delivering the liquid requires maintaining accurate metering precision
Solution Approach 1:
The pump system dynamically adjusts the delivery quantity based on temperature-dependent parameters. The control unit modifies operational parameters such as eccentricity, rotational speed, or stroke volume in response to temperature changes, allowing the pump to adapt its delivery characteristics to maintain accuracy across varying temperatures while preventing freezing.
Solution Approach 2:
The system changes physical parameters (temperature, delivery quantity, rotational speed) to optimize performance. By monitoring temperature and adjusting delivery parameters accordingly, the system prevents freezing at low temperatures while maintaining metering accuracy across the operating range.
2Measurement precision
If the pump delivers excessive liquid additive, then the metering accuracy is compromised, but reducing delivery quantity may lead to insufficient pollutant removal
Solution Approach 1:
The control unit implements feedback control by monitoring temperature and adjusting the delivery quantity based on temperature-dependent parameters. This closed-loop approach ensures that the pump delivers the precise amount of liquid additive required for effective exhaust gas purification while maintaining high metering accuracy across varying operating conditions.
Solution Approach 2:
The system dynamically adjusts delivery parameters based on real-time temperature measurements. By continuously adapting the delivery quantity to match the actual temperature conditions and corresponding parameter changes, the system maintains optimal metering accuracy and ensures sufficient pollutant removal efficiency.
3Device complexity
If the pump operates with fixed delivery parameters, then the structure is simple, but the delivery accuracy varies with temperature changes
Solution Approach 1:
The pump system transitions from fixed to dynamic operation by adjusting delivery parameters based on temperature. The control unit modifies operational characteristics (such as rotational speed, stroke volume, or eccentricity) in response to temperature changes, enabling the system to maintain accurate delivery across varying temperatures while building upon a relatively simple base pump structure.
Solution Approach 2:
The system changes operational parameters (delivery quantity, rotational speed, temperature compensation factors) to maintain delivery accuracy. By implementing parameter adjustments based on temperature-dependent characteristics, the system achieves consistent metering precision without requiring a completely complex pump design.
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
The pump effectively delivers precise quantities of liquid additives at varying temperatures, preventing freezing and ensuring accurate metering, thus reducing consumption and pollutant escape.
Implementation Method 1
an eccentric which can be rotated about an axis relative to the pump housing, a deformable element which is arranged between the pump housing and the eccentric
Implementation Method 2
a deformable element being pressed by the eccentric in sections against the pump housing in such a way that at least one displaceable seal of the delivery channel and at least one closed pump volume in the delivery channel are formed
Data Source
AI summary
A pump includes a pump housing, an inlet, an outlet, a rotatable eccentric, a deformable element between housing and eccentric and a delivery channel from inlet to outlet formed by the deformable element and the housing. The deformable element is pressed against the housing in sections by the eccentric forming a movable seal of the channel and a closed volume in the channel being movable along the channel from inlet to outlet to pump the liquid by rotating the eccentric. A method for operating the pump includes a) setting a liquid quantity to be pumped, b) determining a temperature of the deformable element, c) determining a parameter considering the temperature from step b), the parameter representing a dependence between movement of the eccentric and pump capacity and d) pumping the liquid quantity set in step a) by adapting an operating mode of the pump considering the parameter from step c).