Pneumatic Booster Rate-Shaping for Diesel Torque
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Solution Overview
Problem
Existing pneumatic booster systems for vehicle engines face issues such as 'turbo lag' due to insufficient air delivery at low engine speeds, leading to delayed torque output and rotational speed increases, and can result in abrupt torque changes, exceeding emissions limits, and depleting compressed air reserves, which complicates regulatory compliance and operator comfort.
Innovation Solution
A rate-shaped pneumatic booster system that controls the timing, duration, and flow rate of compressed air injection to tailor the air injection curve, using multiple solenoid-controlled air valves and real-time monitoring of vehicle parameters to optimize engine torque output while adhering to design and regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If compressed air is injected into the intake manifold to reduce turbo lag, then engine torque output increases, but emissions limits may be exceeded
Solution Approach 1:
The system dynamically adjusts the rate and amount of compressed air injection based on real-time engine operating conditions, turbocharger speed, and emissions sensor feedback. This dynamic control allows the system to maximize torque output while staying within emissions limits by continuously optimizing injection parameters.
Solution Approach 2:
The system uses feedback from emissions sensors, turbocharger speed sensors, and engine control units to monitor and adjust compressed air injection in real-time. This closed-loop control ensures that torque enhancement does not cause emissions to exceed regulatory limits.
2Speed
If compressed air is injected rapidly to improve acceleration response, then engine torque increases quickly, but abrupt torque changes cause operator discomfort
Solution Approach 1:
The system employs dynamic rate-shaping control that adjusts the compression air injection rate based on real-time feedback from sensors monitoring engine speed, torque, and vehicle acceleration. This dynamic adjustment smooths torque delivery while maintaining rapid acceleration response.
Solution Approach 2:
The system changes injection parameters (flow rate, duration, timing) dynamically during the boost event to shape the torque curve. By adjusting these parameters in real-time, the system achieves rapid acceleration while avoiding abrupt torque changes that would discomfort the operator.
3Power
If large amounts of compressed air are injected to maximize torque output, then engine performance improves, but compressed air reserves are depleted
Solution Approach 1:
The system applies partial action by injecting only the amount of compressed air necessary to achieve the desired torque enhancement, rather than injecting maximum available air. This optimized injection strategy extends the duration that compressed air reserves can support boost events.
Solution Approach 2:
The system dynamically adjusts injection parameters including flow rate, duration, and timing based on real-time monitoring of compressed air reservoir pressure and engine operating conditions. This optimization maximizes torque output while conserving compressed air reserves for future use.
4Power
If compressed air injection is used to enhance engine torque, then acceleration performance improves, but additional after-treatment equipment is required to meet emissions limits
Solution Approach 1:
The system uses real-time feedback from emissions sensors and engine control units to monitor and adjust compressed air injection parameters. This closed-loop control enables the system to enhance torque while staying within emissions limits without requiring additional after-treatment equipment.
Solution Approach 2:
The system dynamically changes injection parameters (amount, rate, timing) based on real-time emissions monitoring and engine operating conditions. This precise parameter control allows torque enhancement while maintaining compliance with emissions regulations using existing after-treatment systems.
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 system achieves improved fuel efficiency, reduced emissions, and enhanced engine braking performance by precisely managing compressed air injection, allowing vehicles to operate within emissions limits without additional after-treatment equipment, and provides flexible drivetrain performance tailored to individual needs.
Implementation Method 1
using multiple solenoid-controlled air valves and real-time monitoring of vehicle parameters to optimize engine torque output
Implementation Method 2
The greater mass of air present in the cylinder, when combined with additional fuel and ignited, results in higher combustion pressure, and thus higher piston force to be converted by the engine's crankshaft into higher engine torque output
Implementation Method 3
The exhaust-gas turbocharger has a turbine 4 which is driven by exhaust gas from exhaust line 10. The turbine 4 is coupled to a compressor 3
Implementation Method 4
The turbine 4 is coupled to a compressor 3 (together these components form turbocharger impeller unit) which compresses intake air from an intake air inlet 11
Data Source
AI summary
An apparatus and method for improving vehicle performance by application of pneumatic boost to vehicle engines, including diesel engines having at least one turbocharger supplying air to the engine, in a manner which increases engine torque output while minimizing the potential for exceed various operating limits to the maximum practicable extent. The vehicle's pneumatic booster system controller implements strategies for shaping the rate of the air injection during a boost event, tailoring the air injection to obtain maximum engine torque output while respecting the operating limits, by controlling the timing, duration, quantity and/or injection pattern during a boost event to achieve a refined distribution of compressed air injection over the course of the boost event to provide desired engine torque output and fuel efficiency while minimizing the potential for exceeding a wide variety of operation limits, regulatory, engineering and passenger comfort limits.