HEV Engine Start Throttle Compensation for Failed Ignition
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Solution Overview
Problem
Hybrid electric vehicles (HEVs) face challenges in starting the engine smoothly and efficiently, particularly when conditions such as poor fuel quality, spark plug fouling, and reduced airflow hinder successful ignition, leading to multiple failed starts and potential vehicle non-functionality.
Innovation Solution
A method is introduced to adjust the throttle angle command output based on a compensation factor, which can be an adder or multiplier, calculated from previous airflow measurements and ignition attempt numbers, to optimize engine start conditions, including catalyst temperature and vehicle speed, thereby improving the chances of successful engine start.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is shutdown during times when it operates inefficiently to improve fuel economy, then fuel economy is improved, but the engine must start quickly and smoothly when power demand increases, which may be difficult under poor fuel quality, spark plug fouling, and reduced airflow conditions
Solution Approach 1:
The system performs preliminary actions by adjusting the throttle angle command output before engine start attempts based on compensation factors derived from previous airflow measurements. This preliminary adjustment ensures optimal throttle positioning is established in advance, improving the likelihood of successful engine start while maintaining fuel economy benefits during shutdown periods
Solution Approach 2:
The system implements feedback by using previous airflow measurements to calculate compensation factors that adjust the throttle angle command output for subsequent start attempts. This feedback mechanism allows the system to learn from past performance and adapt throttle settings to overcome conditions such as poor fuel quality, spark plug fouling, and throttle sludging, thereby improving engine start reliability
2Reliability
If the throttle angle command output is adjusted based on compensation factors from previous airflow measurements, then engine start reliability is improved under adverse conditions, but the control system complexity increases
Solution Approach 1:
The system applies self-service by automatically adjusting the throttle angle command output based on compensation factors calculated from its own previous airflow measurements. The control system serves itself by learning from past performance and making autonomous adjustments without requiring external intervention or complex additional hardware, thereby improving engine start reliability while minimizing control system complexity
Data Source
AI summary
A method for starting a vehicle engine includes determining a throttle angle command output based on a throttle adjustment parameter. The throttle angle command output may be further adjusted based on a learned compensation adder and may be based on a number of vehicle engine starts. A throttle angle corresponding to the throttle angle command output is provided.