Toyota's Sudden Unintended Acceleration

Topics: Throttle, Electronic throttle control, Toyota Pages: 6 (1978 words) Published: December 10, 2010
University of Sharjah
Electrical & Computer Engineering Department


Term Paper
"TOYOTA’s sudden unintended acceleration"
Submitted to:
Dr. Abdul Kadir Mohammed Hamid

Done by:
Asma Al-Za’abi ID:20721529
Kawther Aljasmi ID:20721556

Introduction about Toyota :
Toyota’s company is a product of many years of experience, production and high efficiency. Toyota has been one of the most successful companies all over the world. Toyota’s company success in leading the Japan’s economy to be NO.1 in Asia, beside that Toyota is a major multinational car manufacturer headquartered in Japan. It was built by Kiichiro Toyoda in 1937. Nowadays this factory is the first factory for cars in the world. And what make Toyota’s so special that it manufactured vehicles with high quality and simplicity in use, beside the less costly compared with the other companies, which make the use of Toyota vehicles so extended. Toyota is the second largest producer of vehicles all over the world with a production of 6 million vehicles per year deployed in more than 160 countries, Also achieve an annual income of 108 billion dollars .Toyota produces a full range models of vehicles and employs 246, 700 staff. It is also one of the top ten companies in the list of Fortune Global 500 largest trading company, There is a survey that has been published in that Toyota is one of the most impressive and appreciated company. "Kiichiro Toyoda," founded the company in 1933, when he had just returned from a tour in the United States, he choose the spin factory which was owned by his father to set up a workshop for the vehicles industry. Then he produces the first models in 1935.

Introduction about the mechanism :

The throttle is a metal plate that connected to the end of the gas pedal this part controls the amount of the air that go to the vehicle’s engine. And the throttle body consists of 4 main parts which is: the throttle plate or butterfly valve

electronic throttle control
Engine Control Unit (ECU)
Talking about the throttle body we have to give you an explanation about it. The main part on the throttle body is the throttle plate, which is a butterfly valve that controls the Intel gases. The throttle plate is communicated by a site of wire. To move the throttle plate there is an electronic throttle control that connects the throttle linkages and the accelerator pedal to a sensor which take the signal to the Engine Control Unit (ECU), which calculate the angel and give the exact position of the plate depending on the inputs. We can say that this part is controlled partially by the driver when he press on it the throttle the plate or the butterfly valves will be opened and the angle is depending on the force you apply it the more force the largest angle and vice versa.

The problem :
Unintended acceleration is the main problem in Toyota’s case. Where you suddenly feel like your vehicle’s speed is increasing up without any order from you to increase, and according to some cases what was happen that if you press on the pedals to drive by 80 km speed you notice that the vehicle is move according to 120 km speed and that is the basic problem here. Most of t he people thought that this problem is because of two reasons. The first one that when you drive the vehicle and while you applying your force on the gas pedals it stuck and it can’t be return to its normal position so this lead to our big problem the unintended acceleration .The second reason that the gas pedals didn’t stuck, but it take more time to return to its normal position this also cause the unintended acceleration that happen to the vehicle. These two reasons cause a lot of accidents resulting with number of deaths and injuries Toyota documented this problem by recalling 4.2 million vehicles to replace the floor mats that might impede the pedals and what they did...
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