Method and device for detecting the initiation of the driving off process by a driver of a vehicle
AssigneeDaimler AG
InventorsKarsten Braeuer, Michael Schopper, Davide Tondelli
Life of this patent
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Abstract
A method and a device are for detecting the initiation of the driving off process by a driver of a vehicle. The time derivatives of the engine torque and of the engine speed are determined, and the initiation of the driving off process is then inferred from an evaluation of these time derivative values. The detection of the driving off process can be used for releasing a brake while avoiding unintentional rolling of the vehicle when making a hill start.
Claims13
A method for detecting the initiation of the driving off process by a driver of a vehicle, wherein at least the time derivative ({dot over (M)}) of the engine torque (M) and the time derivative ({dot over (N)}) of the engine speed (N) are sensed as variables ({dot over (M)}, {dot over (N)}) to be evaluated and the initiation of the driving off process is then inferred from said variables ({dot over (M)}, {dot over (N)}), characterized in that the initiation of the driving off process is detected based on an evaluation result that the time derivative ({dot over (M)}) of the engine torque (M) is greater than or equal to a predefinable engine torque change threshold value ({dot over (M)}0) and at the same time the time derivative ({dot over (N)}) of the engine speed (N) is less than or equal to a predefinable negative engine speed change threshold value (−{dot over (N)}0).
A method of detecting a driving-start process of a motor vehicle that is starting to drive under control by a driver, comprising the steps:
- a) providing a predefined engine torque change threshold value;
- b) providing a predefined negative engine speed change threshold value;
- c) determining an engine torque of an engine of the motor vehicle;
- d) determining an engine rotational speed of the engine;
- e) forming an engine torque time derivative over time of said engine torque or of a first variable indicative of said engine torque;
- f) forming an engine speed time derivative over time of said engine rotational speed or of a second variable indicative of said engine rotational speed;
- g) comparing said engine torque time derivative to said predefined engine torque change threshold value;
- h) comparing said engine speed time derivative to said predefined negative engine speed change threshold value;
- i) if said engine torque time derivative is greater than or equal to said predefined engine torque change threshold value, and said engine speed time derivative is less than or equal to said predefined negative engine speed change threshold value, then in response thereto and based thereon, detecting the occurrence of the driving-start process of the motor vehicle.
An apparatus for detecting a driving-start process of a motor vehicle that is starting to drive under control by a driver, comprising:
- an engine controller that is adapted to provide an engine torque and an engine rotational speed of an engine of the motor vehicle;
- and
- a control device that is connected to said engine controller, and that is adapted to calculate a time derivative of the engine torque and a time derivative of the engine rotational speed;
- wherein said control device is further adapted to compare the time derivative of the engine torque with a predefined engine torque change threshold valued, and to compare the time derivative of the engine rotational speed with a predefined negative engine speed change threshold value, and to signal the occurrence of the driving-start process of the motor vehicle when the time derivative of the engine torque is greater than or equal to the predefined torque change threshold value and the time derivative of the engine rotational speed is less than or equal to the predefined negative engine speed change threshold value.
Dependencies are inferred from the claim text.