JP2001078305A - Retarder - Google Patents

Abstract

(57) [Summary] [Problem] To enable constant vehicle speed control on downhill roads and constant deceleration on flat ground. SOLUTION: A G sensor 3 attached to a vehicle body, an acceleration calculation unit 2 for obtaining a current acceleration from a vehicle speed signal,
A gradient calculating unit 4 for calculating the gradient of the traveling road from the output of the G sensor 3 and the acceleration calculated by the acceleration calculating unit 2; a gradient calculated by the gradient calculating unit 4 and a reference value of a predetermined gradient; And when the gradient of the traveling path is larger than a predetermined reference value of the gradient, the electromagnetic retarder 7 with the built-in exciter 7
On the other hand, a comparator 5 that outputs a signal for performing a constant speed control by setting the target deceleration of the vehicle speed to “0”, and feedback based on the detected vehicle speed signal with respect to the target deceleration = 0. And a braking torque control unit 6 for controlling the generation of a predetermined braking torque.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retarder, particularly an electromagnetic retarder with a built-in exciter capable of controlling a constant vehicle speed on a downhill road and a constant deceleration on a flat ground by using a G sensor mounted on a slope start assist system. It is about.

[0002]

2. Description of the Related Art A conventional electromagnetic retarder with a built-in exciter, when descending on a slope by braking torque control at a constant speed, for example, at the start of descending, if the speed is 50 km / h, the vehicle speed is reduced even though the vehicle speed is to be maintained. It was a reality.

FIG. 4 is a block diagram of braking torque control for maintaining a constant vehicle speed, which is used in a conventional electromagnetic retarder with a built-in exciter.

In FIG. 1, an electromagnetic retarder with a built-in exciter for generating a braking torque corresponding to a vehicle speed based on, for example, an ideal curve shown in FIG. The voltage to be supplied to the field coil 23 is stored in a control table (corresponding to the control table 9 shown in FIG. 1 of the present invention) of a control unit (not shown) based on the vehicle speed signal and the vehicle speed signal. From the information data, and this voltage is used as a target value in the comparison unit 2.
1 has been entered. Exciter SCR inclusion rectifier circuit 22 to exciter built-in electromagnetic retarder field coil 2
The voltage of the control amount supplied to 3 is detected, and the voltage appropriately attenuated by the attenuator 24 is fed back to the comparison unit 21 as a feedback amount. In the comparison unit 21, the comparison unit 2
A deviation between the set voltage of the target value input to 1 and the voltage of the feedback amount is obtained, and the SCR phase control of the SCR inclusion rectifier circuit 22 of the exciter is performed using a known technique so as to make the deviation zero. In practice, a predetermined braking torque is generated from the electromagnetic retarder with built-in exciter by supplying a voltage that makes the above-mentioned deviation zero to the field coil 23 of the electromagnetic retarder with built-in exciter. A cooperative auxiliary braking force is generated.

[0005]

However, in the conventional braking torque control system used in the conventional electromagnetic retarder with a built-in exciter shown in FIG. 4, an output voltage for keeping the vehicle speed constant, That is, the exciter SCR inclusion rectifier circuit 22 to the retarder field coil 23
The voltage supplied to the vehicle is compared with the target set voltage by the comparison unit 21 and the deviation is obtained and controlled. Therefore, as described above, it is not possible to control the generation of the braking torque so that the vehicle speed becomes constant during the downhill. There was a problem.

The present invention has been made in view of the above points, and in particular, an exciter that uses a G sensor mounted on a slope start assistance system and enables constant vehicle speed control on downhill roads and constant deceleration on flat ground. The purpose is to provide a built-in electromagnetic retarder.

[0007]

In order to solve the above-mentioned object, a retarder according to the present invention is an electromagnetic retarder with a built-in exciter for generating a predetermined braking torque characteristic based on a detected vehicle speed signal. G attached to
A sensor, an acceleration calculator for calculating the current acceleration from the vehicle speed signal, a gradient calculator for calculating a gradient of the traveling road from the output of the G sensor and the acceleration calculated by the acceleration calculator.
The gradient calculated by the gradient calculating unit is compared with a predetermined reference value of the gradient. When the gradient of the traveling road is larger than the predetermined reference value of the gradient, the vehicle speed is transmitted to the exciter built-in electromagnetic retarder. Based on the detected vehicle speed signal and a comparator that outputs a signal for performing the constant speed control by setting the target deceleration of “0” to “0”, feedback is applied to the target deceleration of the vehicle speed = 0, A braking torque control unit for controlling the generation of a predetermined braking torque is provided, and constant vehicle speed control is performed on downhill roads, and constant deceleration braking control is performed on flat ground.

An exciter which has a G sensor and is equipped with a slope start assist system for automatically starting on a slope and an electromagnetic retarder with a built-in exciter, and which generates a predetermined braking torque characteristic based on a detected vehicle speed signal. In the built-in electromagnetic retarder, the G sensor is used in a form that shares the G sensor of the slope start assist system.

The G sensor of the slope start assist system is used in a shared form, and based on the detected vehicle speed signal, feedback is applied to the target deceleration of the vehicle speed = 0 to control the generation of a predetermined braking torque. Therefore, constant vehicle speed control can be performed on a downhill road, and constant deceleration braking control can be performed on a flat ground.

[0010]

FIG. 1 shows an embodiment of a retarder according to the present invention.

In FIG. 1, 1 is a vehicle speed detector, 2 is an acceleration calculator, 3 is a G sensor, 4 is a gradient calculator, 5 is a comparator, 6 is a braking torque control unit, 7 is an electromagnetic retarder with a built-in exciter, 8, a feedback control unit; and 9, a control table. Here, a high-precision G sensor 3 is used for performing advanced constant vehicle speed control on a downhill road and advanced constant deceleration braking control on flat ground.

The vehicle speed signal detected by the vehicle speed detector 1 is input to the acceleration calculator 2 and the braking torque control unit 6. The vehicle speed signal input to the acceleration calculation unit 2 is differentiated by the acceleration calculation unit 2, and the acceleration calculation unit 2 obtains the current acceleration.

On the other hand, as disclosed in Japanese Unexamined Utility Model Publication No. 63-112170, a recent automobile equipped with a slope start assistance system is equipped with a G sensor 3 so that a parking brake or a sudden The operation has been simplified, for example, by eliminating the need to change the pedal.

In the present invention, the G sensor 3 is independently mounted for the purpose of controlling the advanced constant vehicle speed control on a downhill road and the advanced constant deceleration braking on a flat ground and in terms of cost. Instead, the G sensor 3 mounted on the vehicle equipped with the slope start assistance system is used in a shared form. The output of the G sensor 3 is input to the gradient calculator 4. The gradient calculating section 4 calculates the output of the G sensor 3 and the acceleration calculated by the acceleration calculating section 2 to determine the gradient of the traveling road.

That is, FIG. 2 is a view for explaining that the gradient of the traveling road is obtained by the G sensor, and the G sensor 3 moves at the speed V ₀ as shown in FIG. When the weight is inclined by θ, the G sensor 3 outputs θ proportional to dV ₀ / dt. Assuming that the vehicle is descending at a speed V on a traveling path having a gradient θ as shown in FIG. 6B (the gradient θ of the G sensor 3 in the figure represents an angle when the vehicle is stationary). , The weight of the G sensor 3 is changed from the position of W1 to the position of W2 as shown in FIG.
), The output of the G sensor 3 at an inclination α = the output of the G sensor 3 at a running road gradient θ + dV / dt by focusing on the weight of the G sensor 3.
From this, the output of the G sensor 3 at the traveling road gradient θ = the output of the G sensor 3 at the gradient α−dV / dt, and if the output of the G sensor 3 and the vehicle speed V at the gradient α are known, the traveling at that time is obtained. The gradient X of the road can be determined.

The gradient X of the traveling road calculated by the gradient calculating unit 4 in this way is compared with a predetermined reference value of the gradient by the comparator 5, and the gradient X of the traveling road is determined by the predetermined gradient reference value. When the value is larger than the value, a signal is transmitted to the braking torque control unit 6 for causing the electromagnetic retarder 7 with a built-in exciter described below with reference to FIG. . The braking torque control unit 6 receiving the signal from the comparator 5 refers to the control table 9 and reads out the previously stored target deceleration = 0, and sets the target deceleration = 0 as a target value in the feedback control 8. Set.

FIG. 3 shows a braking torque control block diagram used in the electromagnetic retarder with a built-in exciter of the present invention.

In this figure, the one-dot chain line is the same as that in FIG. 4, and the difference from FIG. 4 is that a system is used in which the vehicle speed is detected and feedback is further applied.

That is, the output vehicle speed is measured by a vehicle speed detector 1 (FIG. 1).
), And differentiated by a differentiator 25 to obtain acceleration. As described above, deceleration is obtained when descending a slope. This deceleration is fed back to the comparison unit 26 in which the target set deceleration = 0 is set as a feedback amount. The deceleration is compared with the deceleration obtained by the differentiator 25, a deviation from the target set deceleration = 0 is obtained, and this deviation is converted into a voltage by the deceleration-voltage converter 31 to reduce the deviation to zero. The output of the SCR inclusion rectifier circuit 22 of the exciter is controlled such that the deceleration of the differentiator 25 becomes the target set deceleration = 0. Therefore, by switching to a constant vehicle speed on a downhill road, the vehicle can descend on a downhill road at a constant vehicle speed.

Although the description has been made on the downhill, the control table 9 of the braking torque control unit 6 receives a vehicle speed signal and other related signals, for example, a field winding temperature signal of an electromagnetic retarder with a built-in exciter. Information data that takes into account these signals and generates braking torque characteristics such that ideal braking in cooperation with other brakes is applied is stored in advance. Therefore, if the target set deceleration in FIG. 3 is set to be constant in accordance with the vehicle speed detected by the vehicle speed detector 1, it is needless to say that ideal braking with a constant deceleration is applied on level ground.

That is, the improved braking torque control method of the electromagnetic retarder with a built-in exciter shown in FIG. 3 is a method for controlling the deceleration to be constant based on the deceleration obtained from the detected vehicle speed. Optimal retarder braking torque control is always possible on slopes and flat terrain.

Note that the closed loop of the braking torque shown by the one-dot chain line in FIG. 3 may be a feedforward for directly applying a voltage value when the relationship between the voltage and the control torque is known, and Parts can also be omitted. The dashed line is used because control stability is practically good.

[0023]

As described above, according to the present invention, the braking torque control method of the electromagnetic retarder with the built-in exciter is improved, and the gradient of the slope is detected by using the high-definition G sensor. By switching to a constant vehicle speed on a downhill road, the vehicle can go down the hill at a constant vehicle speed, that is, constant speed braking can be performed, and on a flat ground, constant deceleration braking can be performed.

Since the expensive and high-definition G sensor is used in a common use mode, the control system of the retarder together with the automatic hill start control system is simplified, and the cost is reduced as a whole. .

[Brief description of the drawings]

FIG. 1 is a configuration of an embodiment of a retarder of the present invention.

FIG. 2 is a diagram illustrating that a gradient of a traveling road is obtained by a G sensor.

FIG. 3 is a braking torque control block diagram used in an electromagnetic retarder with a built-in exciter according to the present invention.

FIG. 4 is a block diagram of a braking torque control used in a conventional electromagnetic retarder with a built-in exciter to keep the vehicle speed constant.

FIG. 5 is an example of an ideal braking torque curve with respect to a vehicle speed.

[Explanation of symbols]

 Reference Signs List 1 vehicle speed detector 2 acceleration calculation unit 3 G sensor 4 gradient calculation unit 5 comparator 6 braking torque control unit 7 electromagnetic retarder with built-in exciter 8 feedback control unit 9 control table

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masayoshi Komiya 3 Hayakawa, Hayakawa, Nitta-cho, Nitta-gun, Gunma F-term inside the Nitta Plant of Sawafuji Electric Co., Ltd. 5H115 PG10 PU20 QE05 QE06 QE09 QI22 QN06 QN24 TB01 TO02 TO07 5H301 AA03 AA06 BB20 CC06 GG14

Claims (2)

[Claims] 1. An electromagnetic retarder with a built-in exciter for generating a predetermined braking torque characteristic based on a detected vehicle speed signal, wherein a G sensor attached to a vehicle body and an acceleration calculation for obtaining a current acceleration from the vehicle speed signal. A gradient calculating unit for calculating the gradient of the traveling road from the output of the G sensor and the acceleration obtained by the acceleration calculating unit; and a gradient calculated by the gradient calculating unit and a reference value of a predetermined gradient. In comparison, when the gradient of the traveling road is larger than a predetermined reference value of the gradient, a signal for instructing the electromagnetic retarder with built-in exciter to set the target deceleration of the vehicle speed to “0” and perform constant speed control. And a braking torque control unit that performs feedback on target deceleration = 0 based on the detected vehicle speed signal and controls generation of a predetermined braking torque. , Descending the slope with constant speed control, retarder in the plains, characterized in that to perform the control of the constant deceleration braking. 2. A hill start assist system having a G sensor and automatically starting on a hill is mounted, and an electromagnetic retarder with a built-in exciter is mounted to generate a predetermined braking torque characteristic based on a detected vehicle speed signal. In the electromagnetic retarder with built-in exciter, a G sensor that shares the G sensor of the slope start assist system, an acceleration calculator that calculates the current acceleration from the vehicle speed signal, and the acceleration calculated by the output of the G sensor and the acceleration calculator And a gradient calculating unit for calculating the gradient of the traveling road, and comparing the gradient calculated by the gradient computing unit with a predetermined reference value of the gradient, and determining the gradient of the traveling road as the reference value of the predetermined gradient. If it is larger than the above, a signal is output to the exciter built-in electromagnetic retarder to cause the target deceleration of the vehicle speed to be "0" and to perform a constant speed control. If, on the basis of the detected vehicle speed signal, the target deceleration of the vehicle speed = 0
A braking torque control unit that controls the generation of a predetermined braking torque by applying feedback to the vehicle, and the G sensor of the slope start assist system is shared,
A retarder characterized in that a constant vehicle speed control is performed on a downhill road, and a constant deceleration braking control is performed on a flat ground.