BG67351B1 - Device and method for controlling the speed of a vehicle - Google Patents

Abstract

The device and method are intended for vehicles with internal combustion engines and for electric cars. Through them, the choice of the speed, which must be maintained is automatic. The system assists the driver of the vehicle by balancing his/her leg at maintaining the accelerator, respectively the speed of the vehicle. The control of the speed of the vehicle is performed by the driver without having to take their leg off the accelerator pedal. The device consists of a force sensor (2), a microcontroller (12), a driver (13) and a stepper motor (7). Depending on the force that the driver applies to the accelerator pedal (3) and measured by the sensor (2), the following states are formed: - manual control - pedal movement to increase speed; - manual control - pedal movement to deceleration; - automatic control - maintaining the speed.

Description

Field of technology

The invention relates to a device and method for speed control, applicable to cars with internal combustion engines and electric cars.

BACKGROUND OF THE INVENTION

In existing cruise control systems, the selection of the desired speed control is made manually by the driver via an additional button. Such a decision imposes restrictions on the use of the system. A road free of congestion or a road that does not pass through rugged terrain is needed. Using the cruise control function in such conditions requires the constant inclusion of the button to set a new speed, which interferes with driving rather than helping.

(US Patent 5568797, Power Control Assistance Device For Motor Vehicles).

The elimination of the manual selection of the vehicle speed setting is achieved by using an additional support pedal. The use of an additional pedal requires redesign of the original pedal or finding a suitable place to attach the additional pedal. In this case, the position of the driver's foot is changed from the traditional steering.

(Patent 66455. Automatic vehicle speed control device)

Technical essence of the invention

The task is to create a device and method for automatic control of vehicle speed to assist the driver in maintaining a certain speed, automatically selecting the maintained speed, minimize the driver's effort in maintaining vehicle speed without using an additional pedal.

An automatic vehicle speed control device consisting of a accelerator pedal connected by a steel wire to the throttle valve, characterized in that a force sensor is located on the accelerator pedal which is connected to a microcontroller input.

The output of the microcontroller is connected to a stepper motor driver, the outputs of the driver are connected to the stepper motor, and the shaft of the stepper motor is connected via a wire to the accelerator pedal.

The inputs of the microcontroller are also connected: a car speed sensor and a selector switch for mode selection.

Vehicle speed control method, characterized in that at a pressure reported by the sensor Pmin <P <Pmax and dV / dt = 0, a command is given to switch from manual to automatic mode, and a new speed reference is assumed the current speed currently before the transition.

A method for controlling the speed of the vehicle, characterized in that at a pressure recorded by the sensor P <Pmin or P> Ptah, a command is given to switch from automatic to manual mode.

Advantage over existing technical solutions:

- Automatic selection to control the speed of the vehicle is achieved without

BG 67351 Bl uses an additional pedal.

Explanation of the attached figure

Figure 1 is a general diagram of the control system.

Exemplary embodiment of the invention

Vehicle speed control device consisting of a pedal 3 connected by a wire 4 to the throttle valve 6, characterized in that an elastic pad 1 is mounted on the pedal, in which a force sensor 2 is inserted, which is connected to input of the microcontroller 12. To the inputs of the microcontroller 12 are connected the car speed sensor 11, the sensor for the position of the shaft of the stepper motor 9 and the selector switch for mode selection 10. Outputs of the microcontroller 12 are connected to driver 13 which controls stepper motor 7.

Operating principle

When placing the driver's foot on the elastic pad 1 mounted on the accelerator pedal 3, a change in pressure P> 0, P <Pmin is detected by the force sensor 2. The microcontroller activates the control of the driver that powers the stepper motor and the movement of the pedal in the direction of closing the valve. This leads to an additional increase in pressure and at P> Pmin and P <Ptah the microcontroller stops the movement and this leads to fixing the pedal in a stationary state. In this condition, the driver's foot is placed in a freely stationary position on the pedal.

Manual mode.

Throttle opening.

When the pressure from the driver P> Ptah increases, the microcontroller 12 through the driver 13 drives the motor 7 in the direction of release of the pedal (opening of the throttle valve). When the force from the driver P> Pmin and P <Ptah decreases, the movement of the motor is stopped, during which the pedal is fixed together with the leg placed on the driver in a stationary state.

Closing the throttle valve.

When the pressure from the driver is reduced P <Pmin and P> 0, the motor is driven in the closing direction of the valve. When the driver's foot is released on the pedal, the pressure increases to P> Pmin and P <Ptax, stopping the movement of the motor.

Switch to automatic mode.

When the driver's foot is placed on the accelerator pedal 3 and the pressure recorded by the sensor 2 P> Pmin and P <Ptah, at dV / dt = 0 (constant speed vehicle movement), a command is given to switch from manual to automatic mode, as the current speed before the transition is taken as a new speed reference.

Switch to manual mode.

With the driver's foot on the accelerator pedal 3 and the pressure recorded by sensor 2 P <Pmin or P> Ptah, a command is given to switch from automatic to manual mode.

The stepper shaft position sensor 9 serves the microcontroller 12 to indicate the allowable angle of rotation.

Claims (2)

Vehicle speed control device consisting of a pedal (3) connected by a wire (4) to the throttle valve (6), characterized in that an elastic pad (1) is mounted on the pedal, in which a sensor is inserted for power (2), which is connected to the input of the microcontroller (12), to the inputs of the microcontroller (12) are connected the vehicle speed sensor (11), the sensor for the position of the stepper motor shaft (9) and the selector switch mode selection (10) and the outputs of the microcontroller (12) are connected to a driver (13) that controls the stepper motor (7) Vehicle speed control method, characterized in that at a pressure recorded by the sensor Pmin <P <Pmax and dV / dt = 0, a command is given to switch from manual to automatic mode, and for a new speed setting is accepts the current speed at the moment before the transition and at a pressure detected by the sensor P <Pmin or P> Pmax a command is given to switch from automatic to manual mode