Piezo-injector Driving Apparatus with Dynamic Energy Control
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Solution Overview
Problem
Conventional piezo-injector driving apparatuses experience noise, energy loss, and reduced control precision due to large energy changes during charging and discharging of piezoelectric elements, affecting responsiveness and precision in controlling the expansion and contraction of the piezoelectric element.
Innovation Solution
A driving apparatus with a setting circuit and operation circuit that adjust the electrical state amounts to increase the change rate at the start of charging or discharging and decrease it at the end, maintaining high responsiveness while minimizing noise and energy loss, and allowing for variable patterns based on engine or vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the absolute value of change rate of electrical state amounts is increased to maintain high responsiveness, then responsiveness is improved, but noise and energy loss increase
Solution Approach 1:
The patent applies dynamics by making the change rate of electrical state amounts variable over time. Specifically, the absolute value of the change rate is increased after the start of charging or discharging to maintain high responsiveness, and decreased before and at the end of charging or discharging to reduce noise and energy loss. This dynamic adjustment of the change rate profile resolves the contradiction between responsiveness and noise generation.
2Speed
If the absolute value of change rate of electrical state amounts is increased for high responsiveness, then responsiveness is improved, but energy loss increases
Solution Approach 1:
The patent dynamically adjusts the change rate of electrical state amounts during the charging and discharging cycles. By increasing the absolute value of the change rate after startup and decreasing it before and at the end of operations, the system maintains high responsiveness while minimizing energy loss that would otherwise occur during high-rate changes at critical transition points.
3Object-generated harmful factors
If the absolute value of change rate of electrical state amounts is decreased to reduce noise and energy loss, then noise and energy loss are reduced, but responsiveness deteriorates
Solution Approach 1:
Rather than uniformly decreasing the change rate, the patent employs dynamic control where the absolute value of the change rate is selectively increased after the start of charging or discharging to preserve responsiveness, and selectively decreased before and at the end of operations to reduce noise. This temporal differentiation resolves the contradiction between noise reduction and responsiveness maintenance.
4Speed
If the absolute value of change rate of electrical state amounts is increased at the end of charging or discharging, then responsiveness is improved, but vibration and control precision deteriorate
Solution Approach 1:
The patent applies dynamic control by decreasing the absolute value of the change rate before and at the end of charging or discharging operations. This reduction in change rate at terminal phases minimizes vibration of the piezoelectric element and improves control precision, while the change rate is increased during mid-phase operations to maintain overall responsiveness.
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 solution effectively reduces noise and energy loss, maintains high responsiveness, and improves control precision by managing the change rates of electrical state amounts, ensuring precise control of the piezoelectric element's expansion and contraction.
Implementation Method 1
a piezoelectric element (PE) as an actuator... controls the expansion and contraction of a piezoelectric element by charging or discharging the piezoelectric element
Data Source
AI summary
A piezo-injector driving apparatus overcomes disadvantages occurring at the start and the end of charging or discharging of a piezoelectric element while maintaining high responsiveness. At the start and the end of charging a piezoelectric element, the absolute value of a change rate of electrical energy of the piezoelectric element is set lower than in a period between them. Therefore, the pattern of electrical energy of the piezoelectric element is in the shape of the letter S. This prevents an excess of energy supplied to the piezoelectric element at the start of charging and energy supplied to the piezoelectric element at the end of charging.