1. The utility model provides an intelligence braking system footboard stroke detection device which characterized by: comprises a pedal stroke input unit and a pedal stroke detection unit; the pedal stroke input unit comprises a pedal, a booster input rod and a detection rod, and the top of the pedal is hinged with the vehicle body; the pedal is hinged with one end of an input rod of the booster, the other end of the input rod of the booster is connected with the booster, and the booster is fixed on the vehicle body; the middle part of the pedal is hinged with one end of the detection rod; the pedal stroke detection unit comprises a slide rheostat, a power supply, a protection resistor and a current sensor which are sequentially connected in series, and the sliding end of the slide rheostat is connected with the other end of the detection rod.

2. An intelligent brake system pedal stroke detecting method using the intelligent brake system pedal stroke detecting device according to claim 1, comprising the steps of:

1) the pedal travel detection device of the intelligent braking system is assembled, and the booster is fixed on the vehicle body; the power supply is switched on, and the resistance value of the initial access circuit of the slide rheostat is 0;

2) when the pedal is stepped, the detection rod pushes the sliding end of the slide rheostat to move, the resistance value of the slide rheostat is increased, the total resistance of the circuit is increased, and the total current of the circuit is reduced;

3) calculating pedal travelX：

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The above two formulas are jointly solved:

；

in the formula:R _X is a pedal stroke ofXThe sliding rheostat is connected with the resistance value of the circuit,X ₁ the maximum stroke of the slide rheostat is set,R ₁ is the maximum resistance value of the slide rheostat,I _X is a pedal stroke ofXThe current value measured by the current sensor,R ₀ in order to protect the resistance value of the resistor,U ₀ is the supply voltage.

Background

Along with the intelligent deep development of automobiles, the novel intelligent braking system gradually replaces the traditional vacuum boosting system. In the working process of a brake system of an automobile, the travel of a brake pedal reflects the brake operation intention of a driver, pedal operation data is generally required to be collected, but the pedal travel is difficult to accurately measure. At present, all kinds of displacement sensors that detect on the market are generally high in price, and the flexibility is not high, and arrange in the booster mostly, and the structure is complicated, consequently needs a low price, high, the high detection device of precision of flexibility for detect the brake pedal stroke.

Disclosure of Invention

In order to solve the problems, the invention provides a brake pedal stroke detection device and method which are simple in structure, low in cost, high in precision and capable of realizing pedal stroke detection.

The technical scheme adopted by the invention is as follows: a pedal travel detection device of an intelligent braking system comprises a pedal travel input unit and a pedal travel detection unit; the pedal stroke input unit comprises a pedal, a booster input rod and a detection rod, and the top of the pedal is hinged with the vehicle body; the pedal is hinged with one end of an input rod of the booster, the other end of the input rod of the booster is connected with the booster, and the booster is fixed on the vehicle body; the middle part of the pedal is hinged with one end of the detection rod; the pedal stroke detection unit comprises a slide rheostat, a power supply, a protection resistor and a current sensor which are sequentially connected in series, and the sliding end of the slide rheostat is connected with the other end of the detection rod.

A pedal stroke detection method of an intelligent braking system by using the pedal stroke detection device of the intelligent braking system comprises the following steps:

1) the pedal travel detection device of the intelligent braking system is assembled, and the booster is fixed on the vehicle body; the power supply is switched on, and the resistance value of the initial access circuit of the slide rheostat is 0;

2) when the pedal is stepped, the detection rod pushes the sliding end of the slide rheostat to move, the resistance value of the slide rheostat is increased, the total resistance of the circuit is increased, and the total current of the circuit is reduced;

3) calculating pedal travelX：

；

The above two formulas are jointly solved:

；

in the formula:R _X is a pedal stroke ofXThe sliding rheostat is connected with the resistance value of the circuit,X ₁ the maximum stroke of the slide rheostat is set,R ₁ is the maximum resistance value of the slide rheostat,I _X is a pedal stroke ofXThe current value measured by the current sensor,R ₀ in order to protect the resistance value of the resistor,U ₀ is the supply voltage.

Compared with the prior art, the invention has the beneficial effects that: the intelligent brake system pedal stroke detection device has the advantages of simple structure and low cost; the booster is arranged outside the booster, so that the mechanical structure coupled with the booster can be simplified; the invention adopts the sliding end of the slide rheostat to be connected with the pedal through the detection rod, so that the pedal stroke can be indirectly and accurately obtained and is used for vehicle dynamics control.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a flow chart of the detection method of the present invention.

In the figure: 1-pedal, 2-power supply, 3-lead, 4-protective resistor, 5-current sensor, 6-slide rheostat, 7-detection rod, 8-booster, 9-booster input rod and 10-vehicle body.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, the pedal stroke detection device of the intelligent braking system of the present invention includes a pedal stroke input unit and a pedal stroke detection unit; the pedal stroke input unit comprises a pedal 1, a booster 8, a booster input rod 9 and a detection rod 7, and the top of the pedal 1 is hinged with a vehicle body 10; the pedal 1 is hinged with one end of a booster input rod 9, the other end of the booster input rod 9 is connected with a booster 8, and the booster 8 is fixed on a vehicle body 10. The middle part of the pedal 1 is hinged with one end of a detection rod 7; the pedal stroke detection unit comprises a slide rheostat 6, a power supply 2, a protection resistor 4 and a current sensor 5 which are sequentially connected in series through a lead 3, wherein the sliding end of the slide rheostat 6 is connected with the other end of a detection rod 7.

As shown in fig. 2, a pedal stroke detection method using the pedal stroke detection device includes the following steps:

1) the pedal travel detection device of the intelligent braking system is assembled, and the booster 8 is fixed on the vehicle body 10; the power supply is switched on, and the resistance value of the initial access circuit of the slide rheostat 6 is 0;

2) when the pedal is stepped, the detection rod 7 pushes the sliding end of the slide rheostat 6 to move, the resistance value of the slide rheostat 6 is increased, the total resistance of the circuit is increased, and the total current of the circuit is reduced;

3) calculating pedal travelX：

；

The above two formulas are jointly solved:

；

in the formula:R _X is a pedal stroke ofXThe sliding rheostat is connected with the resistance value of the circuit,X ₁ the maximum stroke of the slide rheostat is set,R ₁ is the maximum resistance value of the slide rheostat,I _X is a pedal stroke ofXThe current value measured by the current sensor,R ₀ for protection ofThe resistance value of the protection resistor is set,U ₀ is the supply voltage.