Brake Booster Negative Pressure Control via Purge Pump
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Solution Overview
Problem
The challenge is to maintain adequate negative pressure in a brake booster system when a supercharger is mounted to an engine, as the increased internal pressure of the intake manifold reduces the effectiveness of conventional evaporation gas treatment methods, leading to insufficient negative pressure for the brake booster.
Innovation Solution
A method involving a purge pump connected to a canister with evaporation gas, where the rotational speed and valve opening are adjusted to ensure evaporation gas is injected into the intake pipe at a desired concentration, and the operation of convenience electronic devices and intake valve timing are adjusted to maintain necessary negative pressure in the brake booster.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a supercharger is mounted to the engine, then the power output is improved, but the internal pressure of the intake manifold increases to equal or greater than atmospheric pressure, causing insufficient negative pressure in the brake booster
Solution Approach 1:
A purge pump is introduced as an intermediary device between the canister and the intake pipe to actively manage pressure differentials. The purge pump creates a controlled pressure differential that enables evaporation gas to be suctioned into the intake pipe even when the intake manifold pressure is equal to or greater than atmospheric pressure due to supercharging, thereby maintaining adequate negative pressure in the brake booster.
Solution Approach 2:
The system changes the pressure parameter dynamics by using the purge pump to create a temporary pressure differential during evaporation gas treatment. The controller activates the purge pump to establish a pressure difference between the canister and intake pipe, allowing gas flow against the normal pressure gradient caused by supercharging, thus resolving the pressure conflict between power output and brake booster function.
2Productivity
If the degree of opening of the valve is increased to improve evaporation gas injection, then the evaporation gas treatment efficiency is improved, but the negative pressure in the brake booster becomes insufficient
Solution Approach 1:
The system dynamically adjusts the valve opening degree based on real-time pressure conditions and operational requirements. Rather than maintaining a fixed valve opening, the controller modulates the valve position to balance two competing needs: allowing sufficient evaporation gas to reach the intake pipe for effective treatment while maintaining adequate negative pressure in the brake booster for proper braking function.
Solution Approach 2:
The controller monitors pressure conditions in both the intake system and brake booster, using this feedback information to dynamically adjust the valve opening degree. This closed-loop control ensures that evaporation gas treatment efficiency is optimized without compromising brake booster negative pressure, as the system continuously adapts valve positioning based on actual system state.
3Productivity
If the rotational speed of the purge pump is increased to improve evaporation gas suction, then the evaporation gas removal rate is improved, but the negative pressure in the brake booster becomes insufficient
Solution Approach 1:
The purge pump rotational speed is dynamically adjusted rather than maintained at a constant high level. The controller modulates the pump speed based on the amount of evaporation gas that needs to be removed and the current pressure conditions in the brake booster, enabling high removal rates when needed while preserving sufficient negative pressure for braking function during normal operation.
Solution Approach 2:
The system applies partial action by operating the purge pump at variable speeds rather than always at maximum capacity. The pump runs at higher speeds only when evaporation gas accumulation requires aggressive removal, and at lower speeds or idle when sufficient negative pressure must be maintained in the brake booster, thus avoiding excessive action that would compromise braking performance.
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 allows for smooth injection of evaporation gas into the intake pipe and maintains a vacuum-like state within the brake booster, even with a supercharger, ensuring consistent braking performance by adjusting the operation of electronic devices and valve timings.
Implementation Method 1
the negative pressure applied to an intake pipe during the operation of an engine allows evaporation gas to be suctioned into the intake pipe from a canister
Implementation Method 2
a piston pressed against one side wall of the cylinder by the change in internal pressure of the cylinder caused by the opening of the valve
Data Source
AI summary
A method of securing brake booster negative pressure is provided. The method includes operating a purge pump that is connected to a canister having evaporation gas absorbed thereon and a brake booster and determining whether the evaporation gas is injected into an intake pipe by the operation of the purge pump. Whether a negative pressure of the brake booster is insufficient is determined and when the evaporation gas is being injected into the intake pipe and the negative pressure is insufficient, a degree of opening of a valve provided in a line connecting the canister and the purge pump is adjusted.