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Prius Throttle and Brake Systems: Myth VS. Fact

March 14th, 2010 No comments

Toyota published an article on its pressroom website recently addressing the myths and facts surrounding the Toyota Prius and its brake and throttle systems.

 

Myth: The start/stop button on the dash will not turn off my Prius while it’s running.

 

Fact: On early to 2010 models with a push-button smart key system, pushing and holding the button on the dash for about three seconds will shut off the ignition system on the vehicle – even if it’s in gear and moving along the roadway. Newer models may have different control logic – you only have to press the button briefly to shut down the vehicle. Check your Owner’s Manual for details on your vehicle’s system.

 

 

Myth: The brake system on my Toyota Prius is not able to stop the car at speed with a wide-open throttle condition.

 

Fact: The brake system on each Toyota model is capable of overpowering the driveline to stop the vehicle – even with the throttle in a wide-open condition. See Car and Driver’s article at: http://www.caranddriver.com/features/09q4/how_to_deal_with_unintended_acceleration-tech_dept for more information. Apply firm, steady pressure on the brake pedal – use two feet if needed, to bring the vehicle to a halt. Do not pump the brakes in these conditions, as this may overheat the system, causing a reduction in brake performance. Prius is equipped with a combination of hydraulic and electric regenerative brake systems. All Prius vehicles have a brake system program that reduces gasoline engine power if both the throttle and brake pedals are depressed at the same time. This feature helps reduce the chance of damage to the hybrid system transmission in the event of simultaneous brake and throttle pedal application by the driver, and also helps to slow the vehicle under these circumstances. The regenerative braking via the main electric motor will continue to function to help slow the vehicle

 

 

Myth: In the event you encounter a runaway vehicle, the first thing you should do is to turn off the ignition.

 

Fact: Although turning off the ignition is a possible course of action, the first thing a driver should do is to put the transmission in Neutral. This separates the driveline from the wheels, and gives the driver instant speed control over the vehicle, and allows the driver time to assess what is happening. This also allows continued use of the power steering and brake systems for an easier stopping operation. Pressing the start/stop button to turn off the ignition can be done as a next step. This will shut down power assist to the brakes and steering system – reducing their performance, but the driver can still brake and steer the vehicle manually in this condition. The steering column on Prius will not lock up when the ignition is turned off while the vehicle is moving – allowing the driver steering control. Traditional key type ignitions systems can be turned off while the vehicle is moving without locking the steering column – as long as the key is left in the ignition. Removal of the key may result in a locked steering column, and hamper driver steering control. After placing the transmission in Neutral, and the vehicle is brought to a stop at the side of the road, the final step should be to turn of the ignition.

 

 

Myth: The parking brake is effective in stopping a vehicle at speed.

 

Fact: The parking brake may be helpful in that it can provide some additional brakeforce. However, the amount of brakeforce the parking brake applies will be negligible in a vehicle that is running at anything over paring lot speeds. Placing the transmission in Neutral and using firm steady pressure on the brake pedal will be the best way to bring the vehicle to a stop.

 

 

Myth: The transmission would not go into Neutral when an attempt was made to put it in Neutral.

 

Fact: Prius does have an electronic link between the shift lever and the transmission. The driver should place the Prius in Neutral by moving the shift lever to the “N” position – to the left side of the shift gate, and hold it there for a second – this will put the Prius transmission in Neutral. Firm application of the brakes will slow the vehicle down. Pressing and holding the start/stop button can be used as a final action to stop the vehicle if needed.

 

 

Myth: The harder I pressed on the brake pedal, the more the vehicle accelerated.

 

Fact: In a situation where it appears to the driver that the brake pedal has been depressed, but acceleration results, the driver should stay calm and take immediate action by moving the transmission shift lever to Neutral, use a firm and steady application of the brakes, then get to the side of the road and assess the situation. Neutral allows the driver to gain immediate control, and provides the driver with time to evaluate what is happening to the vehicle.

 

 

Myth: Prius has an electronically controlled brake system, and I don’t believe it is as reliable as regular hydraulic brakes.

 

Fact: Prius does have an electronically controlled brake system which is as reliable as hydraulic brakes. This system utilizes both electric motor regenerative braking and hydraulic braking to stop the vehicle. The Prius system is able to recognize a fault in the regenerative braking system, and will send the driver’s brake input to the hydraulic brakes to stop the vehicle. Prius can also detect a fault in the hydraulic brake system booster, and allow all of the driver’s brake force to be directly sent to the two front brake calipers for maximum stopping power under a “no-boost” condition.

 

 

Myth: If I have a throttle stuck in the wide open position, and I put the vehicle in Neutral to help gain control of the vehicle, the engine will over rev, and be damaged.

 

Fact: If you place your vehicle in Neutral with a wide open throttle, you will hear a lot of engine noise, but don’t be overly concerned by this. All Toyota gasoline engines have a rev limiter function as a part of the engine control program that will prevent over revving of the engine by cutting the fuel supply at a predetermined RPM. This RPM limit varies – depending on the engine type.

 

 

Myth: The Brake Override System will make it difficult to start my vehicle on a hill.

 

Fact: The Brake Override System is designed to stop your vehicle when the brake pedal is firmly pressed in cases where there is acceleration caused by mechanical interference with the throttle pedal. For practical reasons – the Brake Override System will not operate when the brake pedal is depressed first – to allow for uphill starts, while limiting the vehicle’s tendency to roll backwards.  When engaged, the Brake Override System will disengage when the brake pedal is released. It will also not function at vehicle speeds of less than 5 mph, as at this point, the vehicle can be stopped safely.

New Prius experience app now available from App stores

October 28th, 2009 No comments

Toyota Motor Sales (TMS), USA, Inc., along with its advertising agency Saatchi & Saatchi LA, announced Oct. 26 that The Prius Experience App is available for free from the App Store. The Prius Experience App has four modes to help educate and entertain iPhone™ users interested in learning more about the EPA-rated 50 MPG 2010 Toyota Prius hybrid.

This interesting App is a perfect complement to VehiclesTEST’s in-depth review of the new Prius, which features full track-test results and the Prius video road testClick to watch Prius test!.

“The Prius Experience App gives iPhone users a dynamic, in-depth experience of the third-generation Prius in the palm of their hands,” said Tim Morrison, corporate manager of marketing communications for TMS.

Notably, The Prius Experience App takes advantage of the iPhone’s built-in accelerometer to give users a 360-degree interior tour of the Prius. The app has four modes:

Tour - Rotate your iPhone for a 360-degree interior view of the Prius, then explore the features that make the car so unique.

Interact - Use your iPhone camera to interact with the Prius ads you see in your favorite magazines.

Draw - Touch the innovative Multi-Touch user interface to draw directly into the environment of the Prius, then watch it react to your shapes and objects.

Play - Think your way through 10 levels of a force-based game that utilizes the accelerometer.

The Prius Experience App is available for free from the App Store on iPhone or at www.itunes.com/appstore/.

Prius plug-in hybrid debuts at Frankfurt Motor Show

September 13th, 2009 No comments

The 2010 Toyota Prius Plug-in Hybrid (PHV) Concept vehicle will make its world debut at the Frankfurt Motor Show, Sept. 15-27, 2009, according to a press release posted on Toyota’s media website.

Based on the third-generation Prius, recently tested and reviewed by VehiclesTEST in this Prius video, the PHV Concept expands Toyota’s Hybrid Synergy Drive technology, utilizing first generation lithium-ion battery technology and enabling electric operation at higher speeds and longer distances than conventional hybrids. When fully charged, the vehicle is targeted to achieve an electric-only range of approximately 12 miles and will be capable of achieving highway speeds in electric-only mode. For longer distances, the PHV concept reverts to “hybrid mode” and operates like a regular Prius. This ability to utilize all-electric power for short trips or hybrid power for longer drives alleviates the issue of limited cruising range encountered with pure electric vehicles.
 
Beginning in late 2009, Toyota will begin global delivery of 500 Prius PHV vehicles. Of this initial fleet, 150 will be placed with select U.S. lease-fleet customers for market and engineering analysis.

Corolla, Prius and Camry Top Cash for Clunker Buys

September 7th, 2009 No comments

VehicleTEST's review of the Toyota Corolla.

VehicleTEST's review of the Toyota Corolla.

Toyota’s Corolla, Prius and Camry were among the top 5 sellers in the government’s trade-in program, Cash for Clunkers.

According to government data, the Corolla was the No. 2 selling car, while the new Generation 3 Prius was in the No. 4 slot, followed by the No. 5 Camry

VehiclesTEST participating dealers also noted that the Yaris was a big seller, thought the Yaris was not in the top 10. 

The list of hot sellers indicates that consumers are buying more fuel-efficient vehicles than most people expected.

VehiclesTEST offers its full complement of Toyota videos to participating dealers for use on their dealer websites. VehiclesTEST has completed independent road tests of all the models, providing third-party test results and complete full-motion video of all the vehicles in action.

3rd Generation Toyota Prius Test!

July 11th, 2009 1 comment

Testing the all-new 3rd generation Toyota Prius today. This is Toyota’s hottest car on the lot. Watch the Prius video to see if it really does get 50 mpg plus during our extensive road test.