Active Purge System for Hybrid Vehicle Slip Control
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Solution Overview
Problem
Existing purge control systems in hybrid vehicles fail to adequately address the degradation of driving ability due to slip in the power transmission system and the introduction of vaporized gas during mode switching, leading to potential engine clutch burning and torque insufficiency.
Innovation Solution
An active purge system (APS) that uses a separate purge pump and control unit to actively control the purging of vaporized gas by adjusting the purge pump's RPM and valve opening degree based on the driving state of the vehicle, ensuring effective suppression of driving ability degradation during slip occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional purge system is used in a hybrid vehicle during slip control mode, then the vaporized gas can be removed from the fuel tank, but the driving ability is degraded due to insufficient torque generation
Solution Approach 1:
The purge control valve dynamically adjusts the purging rate based on the hybrid vehicle's operating state. During slip control mode, the valve reduces or stops purging to prevent torque insufficiency, while during normal operation it maintains regular purging to remove vaporized gas. This dynamic adjustment resolves the contradiction between vaporized gas removal and driving ability maintenance.
Solution Approach 2:
The system changes the purging parameter (purge flow rate) according to the vehicle's operating conditions. By monitoring parameters such as engine speed, motor speed, and clutch engagement state, the control system adjusts the purge valve opening degree to optimize both vaporized gas management and driving performance under different conditions.
2Adaptability or versatility
If the engine clutch is locked up to synchronize engine and motor speeds, then mode switching is achieved, but impact increases due to inertia force difference
Solution Approach 1:
The slip control mechanism provides beforehand cushioning by allowing a controlled speed difference between the engine and motor during mode transitions. This slip condition acts as a buffer that absorbs the inertia force difference, preventing sudden impact when the clutch engages, while still achieving the desired mode switching.
3Force
If slip control is performed to reduce impact during mode switching, then inertia force difference is managed, but torque generation is insufficient causing vibration and degraded driving ability
Solution Approach 1:
The control system dynamically adjusts the purging operation based on the detected slip control state. When slip control is active and torque generation is insufficient, the system temporarily modifies purging parameters to prevent further degradation of driving ability, while maintaining the beneficial inertia force management provided by slip control.
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 APS effectively prevents driving ability degradation by ensuring the vaporized gas is properly managed and introduced into the intake pipe, even during slip events, thereby maintaining vehicle performance.
Implementation Method 1
a purge pump configured to pressurize the vaporized gas and move the pressurized vaporized gas to the intake pipe
Implementation Method 2
a canister configured to adsorb a vaporized gas generated in a fuel tank
Data Source
AI summary
An active purge system (APS) according to a driving state of a hybrid vehicle includes an active purge unit (APU) configured to pressurize a vaporized gas generated in a fuel tank of the hybrid vehicle and supply the pressurized vaporized gas to an intake pipe, and a control unit configured to control the APU, where the control unit gradually controls a processing amount of the vaporized gas according to the driving state of the hybrid vehicle. The processing amount of the vaporized gas is gradually controlled using the APS according to the driving state of the hybrid vehicle, particularly, a number of places at which slip occurs in a power transmission system of the hybrid vehicle so that degradation of driving ability due to the occurrence of slip is reduced.