Vehicle Control Apparatus Adaptive Driving Force Rate
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Solution Overview
Problem
Existing vehicle control systems face challenges in accurately starting a vehicle when driving force is suppressed, leading to excessive speed when traversing bumps or sloped road surfaces, due to inadequate control over driving force increase.
Innovation Solution
A vehicle control apparatus with an object detecting unit and a suppressing unit that gradually increases driving force from an initial value, with a reduced amount of increase per time once the vehicle starts moving, based on speed, acceleration, and jerk values to prevent excessive speed and shorten traversal time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If driving force is gradually increased until vehicle speed exceeds threshold even after vehicle starts to move, then bump traversal is enabled, but vehicle speed becomes excessive
Solution Approach 1:
The patent applies dynamics by making the driving force control adaptive and variable based on vehicle state. The suppressing unit dynamically adjusts the driving force suppression level: when the vehicle is stopped, driving force is gradually increased with a first rate; when the vehicle starts moving, the increase rate is reduced to a second rate (lower than the first). This dynamic adjustment prevents excessive speed while enabling bump traversal, resolving the contradiction between sufficient force application and speed control.
2Speed
If driving force is immediately stopped when vehicle starts to move, then excessive speed is prevented, but bump traversal time increases
Solution Approach 1:
The patent resolves this contradiction through dynamic control of driving force increase rate. Instead of immediately stopping driving force increase when the vehicle starts moving, the system continues to increase driving force but at a reduced rate (second rate lower than the first rate). This allows the vehicle to complete bump traversal more quickly while still preventing excessive speed, thus reducing the loss of time while maintaining speed control.
3Measurement precision
If driving force is suppressed to enable accurate vehicle starting, then vehicle control precision is improved, but vehicle may not traverse bumps or start on sloped roads
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the driving force suppression level based on vehicle motion state. When the vehicle is stopped, driving force is suppressed and gradually increased with a first rate to ensure accurate starting control. When the vehicle starts moving, the system continues to increase driving force with a second rate (lower than the first) to maintain control precision while providing sufficient force to traverse bumps and start on sloped roads, thus improving both starting accuracy and traversal reliability.
Solution Approach 2:
The patent applies parameter changes by modifying the driving force increase rate parameter based on vehicle state. The system transitions from a first increase rate (when stopped) to a second increase rate (when moving), which is lower than the first. This parameter change allows the system to maintain accurate control during starting while ensuring sufficient driving force is available for bump traversal and sloped road starting, resolving the contradiction between control precision and traversal capability.
Data Source
AI summary
A vehicle control apparatus is mounted in a vehicle and includes: an object detecting unit that detects an object in a travelling direction of the vehicle; and a suppressing unit that suppresses driving force of the vehicle when the object detecting unit detects the object. The suppressing unit performs a first process to gradually increase the driving force when a command to move in the travelling direction is issued and the vehicle is stopped in a state in which the driving force of the vehicle is suppressed, and after the vehicle starts to move from the stopped state, performs a second process to gradually increase the driving force with an amount of increase per time in the driving force that is less than that in the first process.