Vehicle Parking Assist Systems Explained
by: JasonLancaster |
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Almost every kind of vehicle has experienced a growth in size over the past decade. An "entry-level" car by a company such as BMW nowadays might be near the size and weight of a mid-size car ten years ago. As vehicles have gotten bigger, parking has become harder and harder.
The most obvious vehicle size increase has been in the pickup truck segment, where "small" trucks like the Dodge Dakota now look like giants beside their early predecessors. Full-size trucks have also been expanding, becoming heavier, wider and taller. Toyota too has participated in this growth trend. The Toyota Tundra was originally a mid-size pickup marketed to full-size buyers. Toyota realized a larger vehicle could fit more customers, and as a result, the 2007 Tundra was much bigger than earlier models in almost every dimension.
While size does matter, all of that increased mass is nowhere near as easy to park as it used to be. For instance, when you ride in a new Toyota Tundra, you'll probably find it difficult to tell exactly where the truck begins and ends. Vehicle designers, in an effort to make our lives easier, have come up with something called "parking assist" to help overcome this issue.
"Parking assist" is, on most vehicles, a system of sensors mounted on one or both sets of bumpers which beeps as the vehicle approaches an object. The beeps usually begin from about 6 feet away from an obstacle, and increase in frequency as you approach, becoming a continuous tone at about 6 inches from the obstacle. Beeping frequency and onset vary between different systems. The parking assist is a great tool for parallel parking, and can also serve as a warning if a small object such as a fence post or child is near your vehicle. But how does it work?
Basically, a set of eyes are mounted in the vehicle's bumpers. These "eyes", or special sensors, transmit highly focused sound waves at regular intervals from the bumper. When these sound waves come into contact with a solid object, they reflect back towards the sensor. Since the speed of sound is fairly constant through air, a computer uses the time it took for the reflection to be returned in order to calculate the distance between the bumper and the object. This is exactly the same principle employed by submarines using active sonar underwater, except that water transmits the sound waves much better than air, allowing for better range.
While the system is effective when dealing with stationary objects like parked vehicles, posts and garage doors, the sensors are not quite sensitive enough to pick up smaller objects moving past the sensors. This means that small children, animals, or all-terrain vehicles might not generate a warning beep - or at least not a consistent warning beep. So, while parking assist - aka parking sonar - is definitely a useful tool, it is not a replacement for caution. Drivers must still do their best to ensure that there is no one behind or in front of their vehicle when parking.
The next generation of parking assist systems has begun to appear in high-end luxury cars, and it's really quite amazing. Rather than using just sound sensors - which are somewhat inaccurate - the system uses a video camera and a complex computer program in conjunction with the sound sensors. Instead of just warning the driver when they get close, this next generation of parking assist actually steers and parks your car for you. This is really helpful with parallel parking - just so long as you're willing to let your car work the steering, gas, and brake. What will they think of next?
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About the Author
Author Jason Lancaster is the editor of TundraHeadquarters.com, a web site with information, news, and reviews of Toyota Tundra accessories and Tundra parts.
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