Hybrid Vehicle Control Device Managing Engine Torque Response Delay
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Solution Overview
Problem
In hybrid vehicles with supercharged engines, the response delay of engine torque during accelerator return operations leads to excessive electric power input into the power storage device, exceeding chargeable limits due to slow changes in target engine output calculations.
Innovation Solution
A control device that adjusts the smoothing rate for slow change processing based on supercharging pressure and accelerator operation parameters, setting a smaller smoothing rate when supercharging pressure is high to prevent excessive electric power input, ensuring stable engine restart and efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slow change processing is used to calculate target engine output, then engine stability during restart is improved, but electric power input to power storage device exceeds chargeable limits
Solution Approach 1:
The smoothing rate is made variable rather than fixed, changing dynamically based on supercharging pressure conditions. When supercharging pressure is high, a smaller smoothing rate is applied to reduce the delay in target engine output change, thereby controlling the electric power input to within chargeable limits while still ensuring stable engine restart.
Solution Approach 2:
The patent changes the parameter of smoothing rate based on supercharging pressure. By adjusting this parameter according to operating conditions, the system optimizes the balance between engine stability and power management, preventing excessive electric power input while maintaining reliable engine restart capability.
2Power
If supercharging pressure is high, then engine power output is improved, but response delay of engine torque increases during accelerator return operation
Solution Approach 1:
The smoothing rate parameter is adjusted based on supercharging pressure levels. When supercharging pressure is high, a smaller smoothing rate is used to compensate for the increased response delay, allowing the target engine output to change more rapidly and reduce the time loss during accelerator return operations.
Solution Approach 2:
The system uses supercharging pressure as feedback to dynamically adjust the smoothing rate. This feedback mechanism allows the control device to respond to changing engine conditions and optimize the target engine output calculation in real-time, reducing response delay when supercharging pressure is high.
Data Source
AI summary
A control device for a hybrid vehicle includes: a drive control unit that calculates required drive power which is required for a hybrid vehicle based on an accelerator opening when an accelerator return operation is performed, calculates a target engine output which changes slowly with respect to a required engine output for realizing the required drive power through slow change processing, and controls an engine, a first rotary machine, and a second rotary machine such that an engine output reaches the target engine output; and a smoothing rate setting unit that changes a smoothing rate which is used for the slow change processing based on a supercharging pressure and sets the smoothing rate to a smaller value when the supercharging pressure is high than when the supercharging pressure is low.