HEV Base Torque Reserve Control for Responsive Low-NVH Tip-Ins
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Solution Overview
Problem
Existing methods for managing noise, vibration, and harshness (NVH) in vehicle powertrains, particularly in hybrid electric vehicles (HEVs), fail to adequately account for accelerator pedal position and rate of change, leading to inadequate base torque reserves that can result in insufficient responsiveness, fuel inefficiency, and NVH issues.
Innovation Solution
A powertrain operating method that generates an engine base torque reserve based on the accelerator pedal position and its rate of change, coordinating with other factors like drive mode, vehicle altitude, battery state of charge, and transmission gear to ensure appropriate responsiveness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If base torque reserve is increased to improve responsiveness, then vehicle responsiveness is improved, but fuel efficiency deteriorates and NVH issues worsen
Solution Approach 1:
The base torque reserve is made dynamic by adjusting it according to accelerator pedal position and pedal rate of change. The control system continuously adapts the torque reserve level based on current driving conditions, transitioning between different reserve levels as driving demands change, rather than maintaining a fixed high reserve level that would waste fuel during normal operation.
Solution Approach 2:
The system changes the torque reserve parameter based on accelerator pedal position and pedal rate of change. When rapid acceleration is detected (high pedal rate of change), the base torque reserve is increased to enable responsive torque delivery. During normal driving conditions, the reserve is reduced or eliminated to maintain fuel efficiency and avoid NVH issues.
2Loss of time
If base torque reserve is increased to improve responsiveness, then driver torque requests are met faster, but NVH issues worsen
Solution Approach 1:
The torque reserve parameter is dynamically adjusted based on accelerator pedal position and pedal rate of change. High torque reserve is applied only temporarily during rapid acceleration events (tip-ins) when responsiveness is critical, while during normal operation the reserve is minimized to prevent NVH issues from excessive torque reserves.
3Loss of energy
If base torque reserve is decreased to improve fuel efficiency, then fuel economy improves, but vehicle responsiveness deteriorates
Solution Approach 1:
The system dynamically adjusts base torque reserve based on real-time accelerator pedal position and pedal rate of change. During normal driving, minimal or zero torque reserve is maintained to maximize fuel economy. When rapid acceleration is detected, the system quickly increases the torque reserve to ensure responsive torque delivery, then reduces it again after the transient event.
4Device complexity
If traditional NVH management approaches are used without coordinating input transmission actuators, then device complexity is reduced, but drivetrain response coordination deteriorates during tip-ins
Solution Approach 1:
The control system merges the control of input transmission actuators with the base torque reserve management. By coordinating these actuators together based on accelerator pedal position and pedal rate of change, the system ensures that all torque delivery components respond in a connected and synchronized manner during tip-in events, improving drivetrain response coordination without requiring entirely separate control systems.
Data Source
AI summary
A vehicle operating method comprising generating a base torque reserve for an engine based on a position of an accelerator pedal and a position rate of change of the accelerator pedal, where the base torque reserve is an air reserve of the engine generated by the engine. The base torque reserve may further be generated based on one or more of a drive mode, a vehicle altitude, a battery state of charge (SOC), and a transmission gear, in at least one example.