Differential Torque Limiting for Vehicle Skid Protection
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Solution Overview
Problem
New energy vehicles equipped with traction control systems (TCS) often fail to promptly control tire skids, leading to potential damage of the differential and speed reducer due to prolonged sliding lubrication under high speed difference and torque, resulting in accidents and financial losses.
Innovation Solution
A vehicle skid protection method and device that monitors real-time rotating speed difference and torque, uses a differential capability limit value curve to determine if output torque needs to be limited, and enters a protection mode with a man-machine prompt when necessary, ensuring the vehicle's safety and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCS is equipped to control tire skids, then vehicle stability is improved, but response time is delayed (greater than 100 ms)
Solution Approach 1:
The patent pre-establishes a differential capability limit value curve through conversion tests based on PV values before actual vehicle operation. This curve defines the boundary between safe and dangerous operating regions in advance, allowing the controller to immediately determine whether protection is needed without performing real-time complex calculations, thus reducing response time while maintaining stability control effectiveness
2Speed
If driver accelerates to overcome skid, then vehicle speed is improved, but differential damage risk increases
Solution Approach 1:
The patent implements real-time monitoring of left and right wheel rotating speed differences and output torque, continuously comparing actual operating points against the pre-established differential capability limit value curve. When the operating point exceeds the curve boundary, the system provides feedback by limiting output torque to bring the operation back within safe limits, preventing differential damage while allowing speed recovery
Solution Approach 2:
The patent changes the control parameter from simple speed regulation to torque limitation based on the differential capability limit value curve. By monitoring the relationship between rotating speed difference and output torque, and adjusting torque output according to the curve boundaries, the system prevents the differential from operating in dangerous parameter regions while still enabling vehicle speed recovery
3Reliability
If output torque is limited to protect differential, then differential safety is improved, but vehicle acceleration capability deteriorates
Solution Approach 1:
The patent applies torque limitation only partially - specifically when the operating point exceeds the differential capability limit value curve. When operating within safe boundaries defined by the curve, full torque output is permitted, maintaining acceleration capability. The limitation is applied excessively only in the dangerous region beyond the curve, preventing damage while preserving performance in normal operating conditions
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
Effectively reduces abnormal vehicle damage by limiting output torque during overload conditions, extending the vehicle's service life and ensuring user safety by promptly addressing skid situations.
Implementation Method 1
there is sliding lubrication between the planetary gear and the planetary shaft
Data Source
Figure 1~2
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AI summary
The present invention belongs to the technical field of vehicles, and particularly relates to a vehicle skid protection method and device, and a vehicle. The vehicle skid protection method in the present invention comprises the following steps: checking a PV value of a differential, and, on the basis of the PV value, carrying out a conversion test to obtain a differential capability limit value curve based on a TN value; acquiring a left and right-wheel real-time rotating speed difference and real-time output torque of a speed reducer; on the basis of the real-time rotating speed difference and real-time output torque and according to the differential capability limit value curve, determining the use working condition of the differential, and judging whether there is a need to control the output torque upper limit and to enter a protection mode; and, when there is a need to control the output torque upper limit and to enter the protection mode, determining, according to a vehicle state, whether to give a man-machine prompt. The vehicle skid protection method and device, and the vehicle in the present invention can ensure the use safety of vehicle hardware, and avoid the problem that users are not clear about the capability limits of vehicles and thus cause accidents due to incorrect use, thus ensuring the safety of the vehicles and the users.