Hybrid Vehicle Controller Traveling Distance Calculation
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Solution Overview
Problem
In hybrid vehicles, calculating the traveling distances using electric power from the on-board battery is inaccurate when switching control modes based on traveling conditions, especially when the charge depleting mode is selected and the engine operates, as the remaining battery charge level may not change, leading to inaccuracies in estimating motor-based traveling distances with and without switching control.
Innovation Solution
A hybrid vehicle system that includes an electric motor, power storage device, and a controller capable of calculating two traveling distances: one without switching control and one with switching control, by adding distances where the engine is not operating and the charge depleting mode is selected, and using energy consumption data from the vehicle and auxiliary devices to accurately determine the power storage amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switching control is executed based on traveling conditions, then energy management efficiency is improved, but measurement precision of motor-based traveling distance deteriorates
Solution Approach 1:
The traveling distance calculation is segmented into two distinct components: (1) traveling distance during periods when the engine is not operating, and (2) traveling distance during periods when the charge depleting mode is selected. This segmentation allows each component to be calculated using appropriate methods that account for the engine's impact on battery charge levels, thereby resolving the measurement precision issue while maintaining switching control benefits
Solution Approach 2:
The controller acts as an intermediary that monitors and distinguishes between different operating states (engine operating vs. engine not operating, charge depleting mode vs. other modes). By introducing this state-aware calculation mechanism, the system can accurately attribute traveling distance to the appropriate energy source, resolving the measurement precision problem without sacrificing energy management efficiency
2Power
If the engine operates in charge depleting mode, then power availability is improved, but remaining battery charge level accuracy deteriorates
Solution Approach 1:
The calculation method dynamically adapts based on the operating state. When the engine is operating during charge depleting mode, the system recognizes that the remaining battery charge level may not accurately reflect actual battery state, and adjusts the traveling distance calculation accordingly by separating engine-operating periods from non-engine-operating periods. This dynamic approach maintains power availability while improving measurement accuracy
Data Source
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Figure 3A
AI summary
A hybrid vehicle includes an electric motor (10, 12), a power storage device (100), an engine (14), and a controller (300). The controller (300) executes switching control for switching control modes. The controller (300) adds, to a first traveling distance, a traveling distance that is obtained when a state in which the engine is not operating and a power storage amount of the power storage device is higher than a threshold continues, and adds, to a second traveling distance, a traveling distance that is obtained when a state in which the engine is not operating and a charge depleting mode is selected continues.