Braking Force Control Device for Hybrid Vehicles Without Transmission
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Solution Overview
Problem
Existing braking/driving force control devices for hybrid vehicles without transmission cannot perform driving regulation control based on driving environments beyond intentional shifting operations by the driver, and lack excellent reacceleration response.
Innovation Solution
A braking/driving force control device that adjusts output torque and rotation numbers of internal-combustion engines and electric motors by setting multiple shift ranges based on driving environment parameters, allowing control of torque and rotation numbers to adapt to driving conditions such as road gradients and vehicle proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lower limit rotation number is set based on vehicle speed during sequential shifting operation, then the engine operation is controlled to match driver intent, but driving regulation control by driving environment cannot be performed
Solution Approach 1:
The patent applies dynamics by making the lower limit rotation number variable based on multiple parameters including vehicle speed, accelerator opening, and driving environment conditions. The controlling unit dynamically adjusts the lower limit rotation number according to the judged driving environment (normal, upslope, cornering, inter-vehicle distance conditions), enabling both driver intent matching and environmental adaptation.
2Power
If the target rotation number is set based on required torque, then engine torque output matches driver demand, but reacceleration response is degraded
Solution Approach 1:
The patent applies preliminary anti-action by preemptively adjusting the lower limit rotation number upward under specific driving conditions (upslope, cornering, short inter-vehicle distance) before reacceleration is needed. This prevents the engine rotation number from dropping too low during deceleration, ensuring better reacceleration response when the accelerator is subsequently operated.
3Adaptability or versatility
If driving regulation control is implemented based on multiple driving environment parameters, then adaptability to different conditions is improved, but control system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the driving environment into distinct conditions (normal, upslope, cornering, inter-vehicle distance) with specific judgment criteria for each. The range judging unit segments the control logic into separate determination steps for each condition type, making the complex control system more manageable and systematic.
Data Source
AI summary
A braking/driving force control device for changing output torque by controlling torque or a rotation number of a power source includes a unit for setting a plurality of ranges by a plurality of parameters including an output rotation number, a range judging unit that judges that a range corresponds to any of the plurality of ranges based on the parameter while driving, and a control unit that controls the torque or the rotation number of the power source based on a driving environment and a range judgment result by the range judging unit. This enables driving regulation control by, for example, a driving environment other than intentional shifting operation by a driver, in a vehicle of a type without a transmission.