Vehicle Control Device Parking Range Switching
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Solution Overview
Problem
Conventional vehicle control systems face challenges in ensuring the vehicle remains stationary until the parking range of the automatic transmission is fully engaged, leading to potential unintended movement during the switching process.
Innovation Solution
A vehicle control device with a shift-by-wire system that includes a braking device generating braking force from the moment a request to switch to the parking range is accepted until the detection of its settlement, along with configurations for hill start assist, automatic brake hold, and low-speed following control to manage braking forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift-by-wire system is used without additional braking control, then the device complexity is reduced and ease of operation is improved, but the vehicle may move unintentionally during the switching to parking range due to response time delay
Solution Approach 1:
The braking device is activated in advance when the parking range switching request is accepted, before the transmission actually settles into the parking range. This preliminary braking action prevents the vehicle from moving during the response time delay, ensuring reliable parking engagement without requiring additional sensors or complex detection mechanisms.
2Reliability
If braking force is applied continuously until parking range settlement is detected, then the vehicle remains stationary reliably, but driver discomfort increases due to prolonged braking force
Solution Approach 1:
The braking device operates in a feedback-controlled manner: it is activated when the parking range switching request is accepted and continues until the detection unit confirms that the transmission has settled into the parking range. Once settlement is detected, the braking force is automatically released. This feedback mechanism ensures the vehicle remains stationary during switching while avoiding prolonged braking that would cause driver discomfort.
3Speed
If the braking force is released immediately after parking range settlement is detected, then the switching process is completed quickly, but the vehicle may move before the parking range is fully engaged
Solution Approach 1:
The braking device is activated in advance upon acceptance of the parking range switching request, before the transmission actually engages the parking range. This preliminary braking action secures the vehicle in place during the entire switching process, ensuring reliable parking engagement. The braking force is maintained throughout the switching duration and only released after settlement is confirmed, preventing any premature vehicle movement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents the vehicle from moving until the parking range is securely locked, reduces driver discomfort by managing braking forces, and informs the driver of any failures in the parking range switching process.
Implementation Method 1
a braking device which generates a braking force when the acceptance unit accepts a request for switching to the parking range of the transmission
Data Source
AI summary
In order to enable a transmission to reliably perform a switching to a parking range thereof, a vehicle control device includes a shift-by-wire device which switches a shift range of a transmission mounted on a vehicle in accordance with a request by an electric signal, an acceptance unit which accepts a request for switching to a parking range of the transmission, a detection unit which detects that switching to the parking range of the transmission has been settled, and a braking device which generates a braking force when the acceptance unit accepts a request for switching to the parking range of the transmission, from the time of acceptance of the request for switching until the detection unit detects settlement of the switching to the parking range.