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Automatic Vehicle Speed Control – Motor Vehicles
Overview of SAE J195
SAE J195 is an international standard that originally addressed the design and performance requirements for automatic speed control systems in motor vehicles. First issued in 1970, it provided guidelines for system engagement, disengagement, and safety measures. However, in July 2011, the standard was officially cancelled due to lack of regular use and sufficient committee support for maintenance.
⚠️ Cancelled Status: SAE J195 was cancelled in July 2011. It is no longer maintained and may not reflect current industry practices. Engineers should evaluate its applicability for modern designs.
Key Specifications and Engineering Insights
The standard outlined critical design criteria for automatic speed control systems, including performance under various conditions and safety protocols. Below is a summary of the key specifications derived from the standard.
| Specification Area | Description |
|---|---|
| Engagement Conditions | Requirements for when the system can be activated, typically at certain speeds and with driver input. |
| Disengagement Protocols | Conditions under which the system must deactivate, such as brake application or manual override. |
| Safety Measures | Fail-safes to prevent unintended acceleration and ensure driver control at all times. |
| Testing Procedures | Methods to verify compliance with performance and safety standards. |
🛠️ Design Insight: While SAE J195 provided a foundation for early automatic speed control systems, its cancellation highlights the rapid evolution of automotive technology. Modern systems often incorporate advanced features like adaptive cruise control, which go beyond the scope of this cancelled standard.
Frequently Asked Questions
- What are the performance requirements for automatic speed control systems?
SAE J195 outlined specific criteria for maintaining set speed, response to road gradients, and tolerance limits for speed deviations.
- How should the system engage and disengage under various conditions?
The standard specified that engagement should require deliberate driver action, while disengagement should occur immediately upon brake application or system fault detection.
- What safety measures are specified for such systems?
Safety measures included failsafe mechanisms to prevent unintended acceleration, requirement for driver override capability, and indicators for system status.
- How is the system tested for compliance?
Testing procedures involved simulated driving scenarios and verification of response times under controlled conditions.
