How to Move the Car With Touch?

hello I’m in big trouble, My car does not slip when walking the up button, I have not found the answer anywhere, I think if you can get the q UP key to the character of the movement may resolve but also do not know that.

my code:

if (Input.touchCount > i && Input.GetTouch(0).deltaPosition.y> 0 && Input.GetAxis("Vertical") ) {
     	 FrontWheel.motorTorque 	= 500;
		 i = 1;
		 print (vertical);

it comes to recognize the touch but doesnt move…

Solved!!! After a lot search and tests i found a way! There is my Code!

   if (Input.touchCount > i && Input.GetTouch(0).deltaPosition.y >20 && Input.GetTouch(0).phase == TouchPhase.Moved )
           	FrontWheel.motorTorque		= 300;
        	rigidbody.AddForce(*550*Time.deltaTime, ForceMode.Force); 

My car move now correctly!