JPH08275304A - Small size motor car - Google Patents

Abstract

PURPOSE: To avoid an abrupt stop of travel which gives an uncomfortable feeling even in the case where an accelerator lever is carelessly brought into the state of nonaccelerative operation while travelling, by braking travel in response to whether a hand is brought into contact with the accelerator lever or not when the accelerator lever is brought into the state of nonaccelerative operation from the state of accelerative operation. CONSTITUTION: A detecting means 17 detects that a hand is brought into contact with an accelerator lever 13 which is operated together with a hand grip 12A by a hand. On the basis of the detection result of the detecting means 17, when the accelerator lever 13 is returned into the state of nonaccelerative operation from the state of accelerative operation, it is brought into a quick stop mode for quick braking when a hand is not in contact with the accelerator lever 13, and it is brought into a slow stop mode which is slower than the quick stop mode when a hand is in contact with the accelerator lever 13. Therefore, even in the case where the accelerator lever 13 is carelessly brought into the state of nonaccelerative operation at the time of travelling, an abrupt stop of travel which gives an uncomfortable feeling can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an accelerator lever that can be operated together with a handle grip, and a compact size equipped with a braking means for braking the traveling when the accelerator lever is changed from an accelerator operation state to a non-accelerator operation state. Regarding electric cars.

[0002]

2. Description of the Related Art Conventionally, in this kind of small electric vehicle,
For example, as disclosed in Japanese Unexamined Patent Publication No. 6-335116, when the accelerator lever is returned to a non-accelerator operation state, that is, an initial position where accelerator operation is not performed, in order to quickly stop in an emergency, the braking device becomes The vehicle will automatically stop running.

[0003]

However, in the above-mentioned conventional structure, the operating speed of the braking for stopping the traveling, the strength of the braking force, etc. are set to a constant value. Since the braking force was increased so that it could be stopped in an emergency, even if the accelerator lever was accidentally placed in a non-accelerator operation state during the maneuver, it would stop quickly. For this reason, although the accelerator is simply loosened, the vehicle is stopped suddenly, and the driver unexpectedly leans forward and feels uncomfortable. The present invention has been made in view of the above circumstances, and provides a small electric vehicle capable of avoiding a rapid traveling stop that causes discomfort even when the accelerator lever is randomly placed in a non-accelerator operation state during traveling. To aim.

[0004]

In order to achieve the above-mentioned object, a small electric vehicle according to the present invention is provided with an accelerator lever that can be operated together with a handle grip, and the accelerator lever is not operated from the accelerator operated state. In a small electric vehicle equipped with braking means for braking traveling when in an operating state, a detecting means for detecting a manual contact with the accelerator lever is provided, and the accelerator lever is operated based on the detection result of the detecting means. The braking means is controlled so as to be in a quick stop mode in which braking is rapidly performed when there is no manual contact with the accelerator lever when returning from the operating state to the non-accelerating operation state, while the accelerator lever operates the accelerator. When there is manual contact with the accelerator lever when returning from the state to the non-accelerator operation state, Serial so as to slow stop mode the slow braking than sudden stop mode, and characteristic configuration that is provided with brake control means for controlling the braking means. The operation and effect of this characteristic configuration are as follows.

[0005]

In other words, when the accelerator lever is in the non-accelerator operation state when the vehicle is running, the operator's hand remains in contact with the accelerator lever. When it is detected that the lever is in contact and the braking control means determines that the accelerator lever is in the non-accelerating operation state, the braking control means automatically brakes the braking mode slowly. It will switch to the stop mode and brake.
In order to release the accelerator lever grip operation so that a sudden stop is required, the accelerator lever is placed in the non-accelerator operation state when the operator's hand is released from the accelerator lever and the human hand is not in contact with the accelerator lever. When
The vehicle will be stopped suddenly in the sudden stop mode.

[0006]

Therefore, when the operator wants to stop urgently during normal operation, he releases his hand from the accelerator lever.
The detection means detects the state and makes an abrupt stop to perform an appropriate and quick emergency stop, etc., and when the accelerator lever is inadvertently put into the non-accelerator operation state during traveling, the state is detected by the detection means. Since the vehicle is detected and the vehicle is stopped in a slow stop state, the vehicle is stopped slowly without making a sudden stop that would make the driver feel uncomfortable. Became.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows an example of a small electric vehicle. This small electric vehicle is mounted on a vehicle body frame 5 movably supported by a front wheel 2 having a one-wheel structure which is steered by a steering wheel 1 and a pair of left and right rear wheels 4, 4 driven by an electric motor 3. , A passenger seating seat 6, a battery 7, a control device 8 and the like are mounted and configured.

As shown in FIGS. 1, 2 and 5, the steering wheel 1 is connected to a fork member 9 for supporting the front wheel 2 so as to swing the front wheel 2 around the vertical axis. The handle rod support box 11 is provided on the upper end of the handle rod 10, and the pair of left and right U-shaped handle rods 1 in a plan view are provided continuously to the handle rod support box 11.
2, 12 are provided. The handle rod support box 11 pivots an accelerator lever 13 rotatably supported around a horizontal axis P so that it can be gripped together with the handle grips 12A, 12A of the pair of left and right handle rods 12, 12. I support you. This accelerator lever 13
The potentiometer 14 is arranged on the handle rod support box 11 in a state of being linked with the. The potentiometer 14 detects the swing operation amount of the accelerator lever 13 and outputs a signal corresponding to the swing operation amount to the control device 8. Therefore, the control device 8 controls the vehicle speed according to the swing operation amount of the accelerator lever 13,
That is, the drive signal for driving the electric motor 3 is output such that the vehicle speed increases as the swing operation amount increases.
Further, the control device 8 stops the output of the drive signal to the electric motor 3 when the signal from the potentiometer 14 is input to the control device 8 when the accelerator lever 13 is in the non-accelerator operation state. The braking means 15 that brings the electric motor 3 into a dynamic braking state is switched to a state in which it operates as an electric circuit. The accelerator lever 13 is elastically biased by a spring 16 so as to return to the non-accelerator operation position when the swing operation is released.

Further, as shown in FIG. 1 to FIG. 3, an electrostatic contact sensor 17 as a detecting means for detecting contact of a human hand is installed on a grip portion 13a of the accelerator lever 13 which is operated by a human hand. There is. The detection signal of the contact sensor 17 is input to the control device 8. And the control device 8
When the vehicle is running, that is, when the accelerator lever 13 is being operated to swing from the non-accelerator operation position (the initial standby position where the common grip is not operated), the accelerator lever 13 is released. When the accelerator lever 13 is automatically returned to the non-accelerator operation position in the state where the accelerator lever 13 is not in contact with the human hand, the human sensor's non-contact detection signal for the accelerator lever 13 of the contact sensor 17 and the non-accelerator operation state of the accelerator lever 13 are detected. Based on the signal, as shown in FIG. 4B, a sudden stop mode (for example, a braking mode that can stop within 1.5 meters as a mileage from the time when the accelerator lever 13 is switched to the non-accelerating state). The braking means 15 is switched to. On the other hand, when the accelerator lever 13 is returned to the non-accelerator operation position while the hand is still in contact with the accelerator lever 13, the contact detection signal of the contact sensor 17 to the accelerator lever 13 and the detection signal of the non-accelerator operation state of the accelerator lever 13 are detected. 4A, the mode is switched to the slow stop mode (for example, a braking mode in which the vehicle can be stopped at a travel distance of about 3.0 meters from the time when the accelerator lever 13 is switched to the non-accelerator state). Thus, the braking control means 1 for controlling the braking means 15 in the control device 8
Make up eight. More specifically, as shown in FIG. 3, a signal from the potentiometer 14 is input to the control device 8, and a periodic pulse signal S pulse width modulated according to the signal is used for driving the electric motor 3. Control signal output circuit 20 which outputs to the drive circuit 19 which converts into the drive signal of
It has. Then, the battery 7 and the electric motor 3
The drive signal from the drive circuit 19 is input to the base of the first transistor 21 which is connected in series. Also, a second transistor 22 connected to both terminals of the electric motor 3 is provided. The braking pulse signals Q1 and Q2 output from the control signal output circuit 20 are
A braking signal output circuit 23 is provided which converts a braking control signal for switching the circuit so as to short-circuit the terminals of the electric motor 3 and outputs the braking control signal to the base of the second transistor 22.
The control signal output circuit 20 can selectively output a braking pulse signal Q1 having a large pulse width for dynamic braking and a braking pulse signal Q2 having a smaller pulse width. In addition, when the manual non-contact detection signal of the contact sensor 17 to the accelerator lever 13 and the detection signal of the non-accelerator operation state of the accelerator lever 13 are input, the braking pulse signal Q
The contact sensor 1 outputs only 1 to the braking signal output circuit 23.
When the manual contact detection signal to the accelerator lever 13 of 7 and the detection signal of the non-accelerator operation state of the accelerator lever 13 are input, only the braking pulse signal Q2 is output to the braking signal output circuit 23. It is set. As a result, in the former case, the power generation braking time per unit time is long, so a sudden stop will occur as described above.In the latter case, the power generation braking time per unit time will be short, so a slow running stop will occur. become. Here, the control signal output circuit 20, the second transistor 22, and the braking signal output circuit 23 constitute the braking control means 18, and the circuit for short-circuiting the terminals of the electric motor 3 and the second transistor 22 are the braking means 15. Are configured.

[Other Embodiments] In the above-described embodiments, the means for dynamically braking an electric motor for traveling drive is shown as the braking means, but an electromagnetic brake or the like for directly applying a braking force to wheels, axles or the like may be used. good. In place of the configuration of the above embodiment, for example, in the case of the sudden stop mode, the resistance value of the circuit for dynamic braking of the electric motor 3 is made small, and in the case of the slow stop mode, the circuit for dynamic braking of the electric motor 3 is changed. The resistance value may be switched so as to be large.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a steering handle showing a state of manual operation with respect to an initial position of an accelerator lever, and FIG. 1A is a partially cutaway side view of a steering handle showing how an accelerator lever is operated.

FIG. 2 is a plan view showing a steering handle.

FIG. 3 is a block diagram related to braking control means.

FIG. 4 is a graph (a) showing a relationship between time and vehicle speed in the slow stop mode and a graph (b) showing a relationship between time and vehicle speed in the sudden stop mode.

FIG. 5 is an overall side view showing a small electric vehicle

[Explanation of symbols]

 12A Handle grip 13 Accelerator lever 15 Braking means 17 Detection means 18 Braking control means

Claims (1)

[Claims] 1. Braking means (1) provided with an accelerator lever (13) which is operated together with a handle grip (12A), and which brakes traveling when the accelerator lever (13) is changed from an accelerator operation state to a non-accelerator operation state. 1
5) A small electric vehicle equipped with a detecting means (17) for detecting a manual contact with the accelerator lever (13), wherein the accelerator lever is based on the detection result of the detecting means (17). When the (13) is returned from the accelerator operating state to the non-accelerating operating state, the braking means (15) is set so as to be in the sudden stop mode in which the braking is rapidly performed when the accelerator lever (13) is not manually touched. On the other hand, when the accelerator lever (13) is returned from the accelerator operation state to the non-accelerator operation state, when there is manual contact with the accelerator lever (13), the brake is slower than in the sudden stop mode. A small electric vehicle provided with a braking control means (18) for controlling the braking means (15) so that the mode is set.