Engine Sensor Reference Measurement Prediction
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Solution Overview
Problem
New operating strategies in internal combustion engines, such as start-stop and hybrid drive systems, reduce the occurrence of overrun phases necessary for complete reference measurements on sensors, leading to incomplete measurements and energy loss due to interrupted kinetic energy conversion.
Innovation Solution
Predicting future overrun phases based on route data and vehicle parameters to ensure sufficient duration for complete reference measurements, using navigation systems and existing engine control data to authorize or suppress reference measurements accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If start-stop or hybrid drive operating strategies are used, then fuel efficiency is improved, but the occurrence of overrun phases necessary for complete reference measurements on sensors is reduced
Solution Approach 1:
The control unit predicts future overrun phases based on route data before they occur, and plans reference measurements in advance during predicted overrun phases, ensuring measurements are scheduled when conditions are favorable rather than attempting them during unsuitable operating conditions
2Reliability
If reference measurements are carried out during short overrun phases, then sensor calibration is attempted, but the measurement is interrupted and must be carried out again later
Solution Approach 1:
The control unit predicts the duration of future overrun phases in advance and only schedules reference measurements when the predicted duration is sufficient to complete the measurement without interruption, preventing wasted measurement attempts
Solution Approach 2:
The system uses predicted overrun phase duration as feedback to decide whether to initiate a reference measurement, creating a closed-loop control that adapts measurement scheduling to actual driving conditions and avoids interrupting measurements due to insufficient overrun duration
3Reliability
If overrun phases are requested frequently for reference measurements, then sensor testing is ensured, but kinetic energy for regeneration is lost in hybrid vehicles
Solution Approach 1:
The control unit uses feedback from predicted overrun phase duration to intelligently decide when to request overrun phases for reference measurements versus when to allow kinetic energy regeneration, optimizing the trade-off between sensor testing needs and energy recovery opportunities
Solution Approach 2:
The system changes the operational parameters of the hybrid vehicle by dynamically adjusting when overrun phases are activated based on predicted duration, allowing the vehicle to operate in regeneration mode during short overrun phases and only activate overrun when sufficient duration is predicted for both measurement and energy recovery
Data Source
AI summary
A method and a corresponding apparatus for carrying out a reference measurement on a sensor of an internal combustion engine of a motor vehicle during an overrun phase of the internal combustion engine, in order to detect measurement errors of the sensor. Provision is made that future overrun phases of the internal combustion engine, and the duration of the overrun phases, are predicted on the basis of route data; and that a reference measurement on the sensor is carried out only when the predicted duration of the overrun phase is long enough to carry out the reference measurement completely. With the method and apparatus presented, the functioning of sensors can be monitored during an overrun phase of a motor vehicle having an internal combustion engine.