JPH0413240Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vehicle speed over-speed warning device for auto-cruise. This is prohibited by operation.

[Technical background of the invention and its problems]

If an electronic governor is used in the fuel injection system of a vehicle powered by a diesel engine, such as a truck, in addition to normal manual driving by the driver's manual transmission operation and accelerator pedal operation, the electronic governor also displays the target vehicle speed. By issuing this command, it becomes possible to perform auto-cruise at a constant speed without operating the accelerator pedal.

Generally, electronic governors have a control section equipped with a microcomputer, and the function of this control section is to set the position of the control rack in the fuel injection system, so that the fuel is in an optimal state under the given conditions. Adjust the injection amount. Fig. 3 shows an example of the schematic configuration of the control rack and its surroundings, and Fig. 4 shows an example of the electrical circuit of an electronic governor equipped with an auto-cruise function. In Fig. 3, 1 is the fuel injection pump, and 2 is the control The control rack 2 is a component of the fuel increase/decrease mechanism in the pump 1, and the injection amount of the pump 1 changes depending on the position of movement in the horizontal direction in the drawing. Reference numeral 3 denotes a rack position setting section (hereinafter referred to as an actuator), which is composed of a linear solenoid 4 and a plunger 5, and the plunger 5 is connected to the rack 2 described above. A rack position sensor 7 is also connected to the rack 2 via a link 6. 8 is a pump camshaft, and 9 is its rotation speed sensor.

On the other hand, in FIG. 4, 10 is a control unit of the electronic governor, which includes a CPU (central processing unit such as a microcomputer) 11, and a ROM (read-only memory).
12, RAM (Random Access Memory) 13,
Pulse waveform shaping circuit 14, buffer circuit 15, multiplexer 16, A/D (analog/digital)
It consists of a converter 17, a D/A (digital/analog) converter 18, and the like. Then, the output of the engine speed sensor 21 and the output of the vehicle speed sensor 22 are pulse-shaped by a pulse waveform shaping circuit 14 and then sent to the CPU.
11. The output of the auto cruise setting device 20, the output of the brake switch 23, and the output of the clutch switch 24 are amplified by a buffer circuit 15 and supplied to the CPU 11. Fuel temperature sensor 2
5, the output of the intake pressure sensor 26, the output of the intake air temperature sensor 27, and the accelerator pedal position sensor 2.
The output of 9 is supplied to the CPU 11 via a multiplexer 16 and an A/D converter 17. In the case of normal manual driving in which auto cruise is not set, the CPU 11 determines the optimal fuel injection amount, that is, the optimal easy position, according to the output signal of the accelerator pedal position sensor 29, various sensor signals, and switch signals. The rack position setting signal is sent to the actuator drive circuit 3 through the D/A converter 18.
Output to 0. In addition, when auto cruise is set, the CPU 11 determines the optimal fuel injection amount ( The rack position setting signal is output to the actuator drive circuit 30 through the D/A converter 18. Note that the transmission is manually shifted. The actuator drive circuit 30 drives the above-mentioned actuator 3 in response to the rack position setting signal thus applied. At this time, the actuator drive circuit 30, the actuator 3, and the rack position sensor 7 constitute a servo control system.

However, with the above-mentioned auto cruise function, if the vehicle approaches a downhill slope, the actual speed of the vehicle will quickly increase compared to the vehicle speed set for auto cruise, resulting in dangerous situations such as getting closer to the vehicle in front than expected. It is possible that this could lead to a situation where For this reason, it has been considered to issue a warning if the vehicle speed exceeds a certain set value during autocruise, but in order to climb up the uphill that comes after the downhill, the set value It may be necessary to drive at higher speeds.

[Purpose of invention]

The present invention was developed in view of the above points, and its purpose is to provide an auto cruiser with a specific switch that prohibits the warning that is issued when the speed of the vehicle during auto cruise increases excessively. An object of the present invention is to provide a vehicle overspeed warning device for cruises.

[Summary of the idea]

The configuration of the present invention that achieves the above object includes a first determining means for determining whether or not the vehicle is running on autocruise, and an alarm means when the first determining means determines that the vehicle is running on autocruise. a second determining means for determining whether or not the second determining means is in operation;
As a result of the determination by the determination means, if it is determined that the warning means is not in operation, the value obtained by adding the first predetermined value ΔV ₁ to the set vehicle speed V ₀ for auto cruise driving is compared with the current vehicle speed V of the vehicle, and V>V ₀ + ΔV ₁ , a third determination means operates the alarm means, and when the second determination means determines that the alarm means is in operation, the set vehicle speed V ₀ is set to the first setting. The value obtained by adding a second predetermined value ΔV ₂ , which is slightly smaller than the value ΔV ₁ , is compared with the current vehicle speed V of the vehicle, and V<V ₀ +
A fourth device that stops the operation of the above-mentioned alarm means when ΔV ₂ .
A cancel switch for prohibiting the operation of the alarm means, and a fifth judgment means for prohibiting the operation of the alarm means when the cancel switch is turned on.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an electrical circuit diagram when the present invention is applied to a vehicle equipped with a manual transmission equipped with an autocruise function using an electronic governor controlled by a microcomputer, and FIG. 2 is a flowchart showing this operation.

In FIG. 1, the same parts as in FIG. 4 are given the same numbers. In FIG.
1 and the buzzer drive circuit 32 are opened and operated by the CPU 11. Furthermore, 35 is the lamp 33
This is a normally closed cancel switch for prohibiting the operation of the boot 34. To stop the operation, the switch 35 can be turned off (opened).

Next, the operation of the present invention will be explained. CPU
11, it is determined whether or not autocruise is in progress (step S11). As a result, if the determination is "NO", normal control is performed (step S12). on the other hand,
If it is determined as “YES”, the lamp 33 and the buzzer 3
4 is in operation (step
S13). As a result, if it is determined as “NO”, “V>
V ₀ +ΔV ₁ ” is determined. (step
S14). By the way, the set vehicle speed V ₀ is the vehicle speed detected by the vehicle speed sensor 22 when auto cruise driving is set by the auto cruise setting device 20.
It is stored in RAM13. Further, the first predetermined value ΔV ₁ is V ₀ +ΔV ₁ which is the upper limit of the vehicle speed that is considered safe from the viewpoint of danger prevention, and the second predetermined value ΔV ₂ is V ₀ +ΔV 1 .
The values are set so that ΔV ₂ is smaller than V ₀ +ΔV ₁ and stored in the RAM 12, respectively. By the way, if the determination in step S14 is ``YES'', the flag F in the RAM 13 is set to ``1'' (step S15), and the current vehicle speed V increases to a speed that is dangerous for autocruise driving with the set value _V0 . Therefore, the lamp 33 and buzzer 34 are activated (step S16). Then, it is determined whether the cancel switch 35 is off (open) (step S17). If the determination in step S17 is "NO", cruise control is continued with the lamp 33 and buzzer 34 operating (step S18).

By the way, if the driver wants to go down a downhill slope and use that momentum to go up an uphill slope during auto cruise driving, the cancel switch 35 is turned off (opened) in advance. In this way, when the cancel switch 35 is off, the determination in step S17 is "YES", the flag F is set to "1" (step S19), and the lamp 33 and buzzer 3 are turned off.
4 is stopped (step S20). after that,
Cruise control is performed (step S20). After that, cruise control is performed (step S18).
Therefore, if the driver wants to go down a downhill slope and use that force to accelerate up the uphill slope during auto-cruise driving, by turning off (opening) the cancel switch 35 in advance, the vehicle speed V will be reduced to _V0. Even if the voltage exceeds +V ₁ , the operation of the unpleasant lamp 33 and buzzer 34 can be stopped.

By the way, when the cancel switch 35 is turned off (flag F=1), that is, the vehicle speed V>V ₀ +V ₁
Even in this state, if the vehicle speed continues to be equal to or higher than "V ₀ + V ₁ " with the lamp 33 and buzzer 34 not activated, the answer is "NO" in step S13.
``YES'' is determined in step S14, and ``YES'' is determined in step S15, and cruise control is continued with V>V ₀ +V ₁ maintained. In this way, you can accelerate downhill and climb uphill.

By the way, when the cancel switch 35 is turned off (flag F=1), that is, the vehicle speed V>V ₀ +V ₁
Even in this state, if the vehicle speed becomes smaller than "V ₀ + V ₂ " with the lamp 33 and buzzer 34 not activated, "NO" is determined in step S13, "NO" is determined in step S14, and "V<" is determined in step S21. _V0 + _V2 ”
If the judgment is "YES", flag F is set.
is set to "0" (step S22), and cruise control is continued (step S18).

On the other hand, since the cancel switch 35 has not been turned off in advance, the vehicle speed becomes V>V ₀ +V ₁ and the lamp 3
3 and the buzzer 34 are activated, and the vehicle speed V<
If V ₀ + V ₂ , select "YES" in step S23.
It is determined that the operation of the lamp 33 and the buzzer 34 is stopped.

[Effect of idea]

As detailed above, according to the present invention, a switch is provided to disable the warning that is issued when the speed of the vehicle during autocruise increases excessively, as necessary, so that it is possible to prevent the vehicle from going downhill during autocruise. With that momentum, you can run uphill without activating unnecessary alarms.

[Brief explanation of drawings]

Fig. 1 is an electrical circuit diagram showing an embodiment of the present invention, Fig. 2 is a flowchart thereof, Fig. 3 is a schematic diagram of the control rack and its surroundings, and Fig. 4 is an electronic governor with an auto-cruise function. FIG. 7...Rack position sensor, 10...Electronic governor control unit, 11...CPU, 33...Lamp, 3
4...Buzzer, 35...Cancel switch.

Claims (1)

[Scope of utility model registration request] a first determining means for determining whether or not the vehicle is running on autocruise; and a first determining means for determining whether or not an alarm means is in operation when the first determining means determines that the vehicle is running on autocruise. 2, and if it is determined that the warning means is not in operation as a result of the judgment by the second judgment means, the value obtained by adding the first predetermined value ΔV ₁ to the set vehicle speed V ₀ for auto cruise driving and the vehicle speed. Compare with the current vehicle speed V>V>V ₀ +ΔV ₁
a third determining means for activating the warning means when the second determining means determines that the warning means is in operation;
A second set value slightly smaller than the first set value ΔV ₁ to V ₀
a fourth determination means that compares the sum of a predetermined value ΔV ₂ and the current vehicle speed V of the vehicle, and stops the operation of the warning means when V<V ₀ +ΔV ₂ ; and prohibits the operation of the warning means. 1. A vehicle overspeed warning device for autocruise, comprising a cancel switch and fifth determination means for prohibiting operation of the warning means when the cancel switch is turned on.