Hybrid Engine Start Control Using Driver Intent and Battery Power
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Solution Overview
Problem
Existing engine control methods for hybrid architecture vehicles often result in unnecessary engine starts or delays, leading to a poor driving experience and potential safety hazards due to unreasonable setting of power demand differences and calibrated pedal values.
Innovation Solution
An engine control method that determines the driving intention based on the current opening value and change rate of the accelerator pedal, combined with the current maximum discharge power value of the battery and the vehicle's maximum external characteristic power value, to precisely control engine start and stop operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine start is controlled by monitoring the difference between battery electric driving capability and power demand, then the engine can be started when power demand approaches battery capability, but this causes unnecessary start or start delay due to unreasonable difference value setting
Solution Approach 1:
The patent changes the control parameters from fixed threshold values to dynamic parameters including accelerator pedal opening value, opening change rate, battery discharge power value, and vehicle external characteristic power value. This allows the system to adapt to different driving conditions and accurately identify driver intent, resolving the contradiction between reliable engine start timing and ease of control parameter setting.
Solution Approach 2:
The patent implements a feedback mechanism by continuously monitoring multiple parameters (pedal opening, opening change rate, battery power, vehicle power characteristics) and using this information to dynamically adjust engine start control decisions. This feedback loop eliminates the need for pre-set fixed thresholds and improves start timing accuracy.
2Reliability
If the engine start is controlled by monitoring the pedal opening value against a calibrated value, then the engine can be started when pedal opening exceeds the threshold, but this causes unnecessary start or start delay due to unreasonable calibrated value setting
Solution Approach 1:
The patent transforms the simple threshold-based control into a multi-parameter decision system that considers pedal opening value, opening change rate, battery discharge capability, and vehicle external characteristic power. This comprehensive parameter set replaces the single calibrated threshold, improving reliability while the control unit automates the complexity management.
Solution Approach 2:
The patent performs preliminary analysis of multiple parameters before making the engine start decision. By evaluating the combination of pedal opening, opening change rate, battery power, and vehicle power characteristics in advance, the system ensures accurate timing without requiring complex post-processing or adjustment mechanisms.
3Productivity
If traditional engine control methods are used with fixed thresholds, then the control logic is simple, but the power response is poor and driving experience is degraded
Solution Approach 1:
The patent introduces dynamic control by considering the rate of change of accelerator pedal opening and the real-time power capabilities of the battery and vehicle. This dynamic approach allows the system to respond rapidly to changing driving conditions and accurately predict driver intent, significantly improving power response speed compared to static threshold-based control.
Solution Approach 2:
The system performs preliminary assessment of multiple parameters including opening change rate and power availability before triggering engine start. This advance preparation and multi-factor evaluation enable faster and more accurate power response while the control unit manages the computational complexity automatically.
Data Source
AI summary
The disclosure provides an engine control method, system, and vehicle, and the vehicle comprises a battery and an engine, wherein the method includes: obtaining a current maximum discharge power value of the battery, and a current maximum external characteristic power value of the vehicle; obtaining a current opening value and a current opening change rate of an accelerator pedal of the vehicle; determining a driving intention based on the current opening value and the current opening change rate; and controlling start and stop of the engine according to the driving intention, the current maximum discharge power value, and the current maximum external characteristic power value of the vehicle. Since the driving intention is determined by the current opening value and the current opening change rate in advance, and based on the determined driving intention, in combination with the current maximum discharge power value of the battery and the current maximum external characteristic power value of the vehicle, the power response is carried out in advance so as to ensure that a larger power request can be satisfied at the next moment, thus avoiding the case where the engine is unnecessarily started or is not started in time.