Adaptive Cruise Control Acceleration for Rear Approaching Vehicles
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Solution Overview
Problem
Adaptive cruise control systems may not provide sufficient acceleration to maintain adequate spacing from vehicles approaching from the rear, leading to driver dissatisfaction due to insufficient acceleration rates.
Innovation Solution
The system includes a powertrain and controllers that adjust the ACC resume acceleration based on information from rearward sensors, using a look-up table and gain factors to determine the required acceleration, ensuring a minimum timed headway distance by calculating and applying the maximum acceleration necessary to maintain safe spacing from rearward vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ACC system uses nominal acceleration (approximately 1 m/sec²) to resume speed after lane change, then the system operates with standard control parameters, but the acceleration is insufficient to maintain adequate spacing from vehicles approaching from the rear
Solution Approach 1:
The patent implements dynamic acceleration adjustment by modifying the ACC resume acceleration based on detected rearward approaching vehicles. The system transitions from a fixed nominal acceleration (1 m/sec²) to a variable acceleration profile that increases when rear vehicles are detected, maintaining adequate spacing dynamically rather than using a static control parameter.
Solution Approach 2:
The system uses rearward sensors to detect approaching vehicles and feeds this information back to the controller, which then adjusts the acceleration command. This closed-loop feedback mechanism allows the ACC system to respond to rear traffic conditions and modify its acceleration behavior accordingly, ensuring safe spacing is maintained.
2Ease of operation
If the ACC system accelerates at nominal rates, then the control logic remains simple, but driver intervention is required when rear vehicles approach too quickly
Solution Approach 1:
The system performs preliminary detection of rearward approaching vehicles and proactively adjusts acceleration before the spacing becomes unsafe. By detecting rear vehicles in advance and pre-adjusting the acceleration profile, the system prevents situations that would require driver intervention, maintaining smooth automated control.
Solution Approach 2:
The patent modifies the acceleration parameter dynamically based on rear traffic conditions. The controller changes the acceleration rate from the nominal value to a higher value when rear vehicles are detected, adjusting control parameters in response to environmental conditions without requiring driver input.
Data Source
AI summary
A vehicle may include a sensor configured to detect a rearward approaching object and at least one controller configured to cause the vehicle to accelerate in response to the sensor detecting a rearward approaching object while the vehicle is moving forward.