| 摘要 |
FIELD: physics. ^ SUBSTANCE: according to the first version, the display device has a computation unit and a display unit. The computation unit determines the index with which the vehicle is allowed to slow down without actuating the mechanical braking mechanism. The display unit displays the index. In the second version, the display device has computation apparatus and display apparatus. ^ EFFECT: more efficient use of fuel. ^ 8 cl, 9 cl |
