Hybrid Engine Start Control via Induction Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid vehicles experience engine start shock during slow acceleration due to rapid engine starting, which affects driving performance and throttle response.
Innovation Solution
An engine start control device for hybrid vehicles that includes a hybrid controller, an acceleration position sensor, and a start/power generation motor, which determines whether to start the engine while the electric motor is running and controls the induction system pressure based on the driver's acceleration demand to minimize shock and ensure smooth acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine start time is shortened by controlling induction system timing, then engine start speed is improved, but engine start shock increases
Solution Approach 1:
The patent applies dynamics by making the induction system control strategy changeable based on operating conditions. The hybrid controller dynamically adjusts the induction system control timing and pressure based on acceleration demand, transitioning between different control modes (first control when acceleration demand is small, second control when acceleration demand is large) to optimize both start speed and minimize shock in different scenarios
Solution Approach 2:
The patent changes physical parameters of the induction system (pressure and timing) based on acceleration demand. When acceleration demand is small, the controller adjusts induction system pressure and timing to prevent immediate torque application, reducing start shock. When acceleration demand is large, the controller optimizes timing for rapid engine start, maintaining good throttle response
2Productivity
If the engine starts rapidly, then productivity is improved, but driving comfort deteriorates due to engine start shock
Solution Approach 1:
The patent applies local quality by implementing different control strategies for different operating conditions. The hybrid controller detects acceleration demand and applies localized control adjustments to the induction system timing and pressure based on the specific scenario (slow acceleration vs. rapid acceleration), providing optimized performance for each condition rather than a uniform approach
Data Source
AI summary
An engine start control device for a hybrid vehicle equipped with an electric motor and an engine with an induction system, including a hybrid controller that performs an engine start determination to determine whether the engine should be started while the electric motor is running; an acceleration position sensor that detects an acceleration demand during the engine start determination; and a start/power generation motor that starts the engine, wherein the start/power generation motor controls the pressure in the induction system based on acceleration demand.