Fuel Saving Driving Diagnostic Device for Accelerator and Shift Analysis
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Solution Overview
Problem
Existing driving support devices only provide guidance on accelerator-pedal opening for fuel-saving driving, failing to determine whether the selected gear position is optimal for fuel efficiency, leading to potential incorrect assessments of fuel-saving driving modes.
Innovation Solution
A fuel-saving driving diagnostic device that includes a speed sensor, an accelerator pedal opening sensor, and an ECU, which diagnoses fuel-saving driving from both the viewpoint of accelerator operation and shift operation by analyzing vehicle speed and engine speed relationships, ensuring comprehensive evaluation of driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driving support device only provides reference guide value for accelerator-pedal opening, then the device complexity is reduced, but the diagnostic precision of fuel-saving driving is insufficient because it cannot determine whether the selected gear position is optimal
Solution Approach 1:
The fuel-saving driving diagnostic function is segmented into two independent diagnostic modules: one for accelerator operation diagnosis (comparing actual accelerator-pedal opening with reference guide value) and another for shift operation diagnosis (determining optimal gear position based on vehicle speed and engine speed). This segmentation allows each module to focus on its specific diagnostic task, improving overall diagnostic precision while keeping individual modules relatively simple
Solution Approach 2:
The ECU is designed to perform multiple diagnostic functions: it not only provides reference guide values for accelerator-pedal opening but also determines optimal gear positions and performs both accelerator operation diagnosis and shift operation diagnosis. This multi-functionality enables comprehensive fuel-saving driving assessment without requiring separate dedicated devices for each diagnostic function
2Ease of operation
If the driving support device derives reference guide value only in current gear position, then the ease of operation is improved, but the reliability of fuel-saving driving guidance is reduced because it cannot assess whether the current gear position is proper
Solution Approach 1:
The ECU performs preliminary determination of the optimal transmission gear ratio based on vehicle speed and engine speed before providing accelerator-pedal opening guidance. By pre-determining the optimal gear position, the system ensures that the reference guide value for accelerator-pedal opening is provided in the context of the most fuel-efficient gear position, thereby improving the reliability of fuel-saving driving guidance
Solution Approach 2:
The system provides dual feedback to the driver: feedback on accelerator-pedal opening (comparing actual with reference) and feedback on shift operation (comparing current gear position with optimal gear position). This comprehensive feedback mechanism enables the driver to adjust both accelerator operation and gear selection to achieve fuel-saving driving, significantly improving guidance reliability
Data Source
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AI summary
A fuel saving driving diagnostic device includes an ECU that diagnoses fuel saving driving from a viewpoint of accelerator operation based on a relation between a parameter related to a vehicle speed and a parameter related to an accelerator operation amount and diagnoses fuel saving driving from a viewpoint of shift operation based on a relation between a parameter related to a vehicle speed and a parameter related to an engine speed.