Vehicle Control System for Quick Cruise Initiation
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Solution Overview
Problem
Existing vehicle control systems require time to set target vehicle speed and necessitate driver input for constant-speed drive initiation and maintenance, lacking ease and adaptability to driving state variations.
Innovation Solution
A vehicle control system that sets target vehicle speed based on real-time accelerator operations, allowing quick start and adaptation of constant-speed drive through accelerator-off operations, with optional brake and steering input considerations, and includes a power output device configuration that can switch between engine and motor power sources for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the target vehicle speed is set only after keeping constant speed for a preset time period, then the constant-speed drive control can be initiated, but it takes time to set the target vehicle speed and delays the start of constant-speed drive
Solution Approach 1:
The system performs preliminary detection of accelerator operation states and pre-calculates the target vehicle speed based on current driving conditions before the driver actually requests constant-speed drive. When the driver releases the accelerator pedal, the system has already prepared the target speed value, enabling immediate transition to constant-speed drive without waiting for a preset time period.
Solution Approach 2:
The target vehicle speed is dynamically determined based on real-time detection of accelerator operation states and current vehicle speed, rather than using a fixed preset time period. The system adaptively sets the target speed according to the driving situation, allowing flexible and immediate initiation of constant-speed drive whenever the driver releases the accelerator pedal.
2Ease of operation
If the driver keeps foot on the accelerator pedal for constant-speed drive, then the constant-speed drive can be maintained, but the driver operation becomes complex and requires continuous input
Solution Approach 1:
Once the driver releases the accelerator pedal to initiate constant-speed drive, the system automatically maintains the constant speed without requiring continuous driver input. The control system monitors driving conditions and self-adjusts the power output to sustain the target vehicle speed, freeing the driver from the need to keep foot on the accelerator pedal.
Solution Approach 2:
The system continuously monitors accelerator operation states, vehicle speed, and driving conditions, using this feedback to automatically adjust and maintain the constant-speed drive. When the driver releases the accelerator pedal, the feedback loop ensures the vehicle speed is maintained at the target level without requiring further driver intervention.
3Productivity
If the target vehicle speed is set immediately at accelerator-off operation, then quick start of constant-speed drive is achieved, but the system must accurately detect and respond to accelerator operation state changes
Solution Approach 1:
The system employs continuous feedback detection of accelerator operation states, monitoring whether the accelerator is in the on-state or off-state at each control cycle. This real-time feedback enables immediate and accurate detection of when the driver releases the accelerator pedal, allowing instant setting of the target vehicle speed and quick initiation of constant-speed drive.
Solution Approach 2:
The system replaces complex mechanical detection mechanisms with electronic sensing and control unit processing to detect accelerator operation states. The control unit electronically monitors the accelerator pedal position and state changes, providing rapid and precise detection of accelerator-off operations without complex mechanical components.
Data Source
AI summary
In the vehicle of the invention, when the driver releases a depressed accelerator pedal, the drive control sets a vehicle speed V at the moment to a target vehicle speed V* (step S440). An engine and a motor for outputting driving power are controlled to drive the vehicle at the target vehicle speed V*. When the driver steps on a released brake pedal, the drive control stores the target vehicle speed V* set before the driver's depression of the brake pedal as a previous target vehicle speed Vpre and cancels the setting of the target vehicle speed V* (steps S470 and S480). In response to the driver's subsequent release of the brake pedal, the drive control sets the vehicle speed V at the moment to the target vehicle speed V* (step S510) and restarts constant-speed drive (cruise drive). When the driver turns a steering wheel to or over a preset degree for a left turn or a right turn, the drive control sets the previous target vehicle speed V* to the target vehicle speed V* (step S520) and restarts the constant-speed drive. This arrangement ensures easy and quick start of the constant-speed drive (cruise drive) and enables the constant-speed drive (cruise drive) according to the variation of the driving state.