JPS58127220A - Constant speed running device for car - Google Patents

Abstract

PURPOSE:To attain smooth acceleration, by keeping the reduction gear ratio unchanged for a limited time after the operation of a resume switch 21. CONSTITUTION:When a foot is detached from an acceleration pedal 3 at the same time as the operation of a resume switch 21, the engine braking is activated in having a clutch at the 4th speed position, but the shock is small because of the 4th position of the clutch. During the limited time of a delay circuit 34, a solenoid valve 8 is controlled with an output from a duty control circuit 15 and acceleration is done while keeping the clutch at the 4th speed position. After the operaton for the switch 21, i.e., an FF20 is set and a limited time is elapsed, the delay circuit 34 introduces a high level signal to a gate G2, a solenoid 36 stopping the over-drive is excited, and the clutch is switched to the 3rd position speed for acceleration.

Description

[Detailed Description of the Invention] Misfire 1J relates to a constant speed running system for automobiles, and more specifically, it transmits power from an internal combustion engine through a transmission, and changes the actual vehicle speed to a predetermined next set vehicle speed by operating a resume switch. The present invention relates to a constant speed driving device for an automobile that is VC-controlled so that the vehicle reaches constant speed and runs at a constant speed.

Conventionally, while driving in 4th gear of an automatic transmission, if you simultaneously operate the resume switch, take your foot off the accelerator pedal, and stop the so-called overdrive operation, the shift will change to RT and 3rd gear. , acceleration is performed.

This f'Lvc compensates for insufficient acceleration on the uphill slope, for example. In such prior art, when driving downhill, when the output of the internal combustion engine is large, and when the reaction force of the link mechanism connected to the throttle valve is weak, the acceleration becomes too large, and the passenger people felt fear.

The purpose of the present invention is to solve the problem only in cases where acceleration is insufficient and the speed must be increased by increasing the reduction ratio.
To provide a constant speed running device for a private vehicle which stops an overdrive operation to prevent unnecessary sudden acceleration.

FIG. 1 is a block diagram of one embodiment of the present invention. Fuel is supplied to the internal combustion engine VC via a throttle valve 11 . This power from the internal combustion engine is transmitted to the wheels via the transmission. The throttle valve l reaches the accelerator pedal 3 via the link mechanism 2 and reaches the working chamber 51 of the actinator 4! 1 - Continuous with the rubber 7 ram 6 made of a specified material such as rubber. A solenoid valve 8 is connected to the working chamber 5 . This solenoid valve 8 is connected to the line 7
When line 7 is at a high level, the working chamber 5 is communicated with a negative pressure source such as an intake manifold, and when line 7 is at a low level, the working chamber 5 is brought to atmospheric pressure. The actual vehicle speed of the automobile is detected by the first speed detection circuit 9V (therefore, the vehicle speed detection circuit 9r!
, a vehicle speed signal consisting of a pulse train having the same wave number proportional to the actual vehicle speed is sent to the same wave number voltage conversion circuit IO #4. I can do it. The same wave number voltage conversion circuit lO provides a signal to a subtracter 12 via a line 11. The memory 13 stores a predetermined next set vehicle speed, and the output from the memory 13 is input to the subtracter 12. The subtracter 12 sends a signal 1 to a line 14 corresponding to the vehicle speed difference (=actual vehicle speed, general constant vehicle speed) vC and having a specific voltage! I-
It is derived and given to the duty control circuit 15. memory 13
The output from the lightning frequency voltage conversion circuit 10 is stored and set corresponding to the actual vehicle speed when the center switch 16 is operated while the vehicle is running. Duty control circuit 15 derives a duty signal corresponding to the vehicle speed difference to line 18. As a result of this NVC, the absolute value of the negative pressure in the working chamber 5 increases, so the opening degree of the throttle valve 1 increases, and as the pressure approaches atmospheric pressure, the opening degree of the throttle valve 1 is controlled to be small, thereby reducing the actual vehicle speed. When the set vehicle speed is reached, constant speed driving is performed. Output 1- from cent switch 16! , flip-flop 20 via OR gate 19. Resume switch 2
The output from 1 is also sent to flimp flop 20i via OR gate l91. This flipflop 2
0's cent output QH1AND'y'-)GlNO-)5 is given to the input. The duty signal from the duty control circuit 15 via the line 18 is an AND game)
Gl is given an input ζ of another force. The output from AND gate G1 is led out to line 7 through amplification port 122vi. In this way, in the state where the 7 limp flop 2o is sent, the duty signal from the duty control circuit 15 is given to the solenoid valve 8, and as described above,
Constant speed driving is performed. When the brake pedal, flange pedal, etc. are operated, 1cl-1 and cancel switch 23 are activated, and this causes 7rip 70ramp 2.
0 is reset, and the set output Q becomes low level.

A signal corresponding to the vehicle speed difference from the line 14 is sent to one input terminal 27.
28 respectively. The other input terminal 29 of the comparator circuit 25 receives the vehicle speed difference Δ■1 = l Okm/h V
A voltage from a power source 31 corresponding to C and having a specific voltage v1 is applied. The other input terminal 30VC of the comparator circuit 26 is given an output from the voltage #32 having a specific voltage corresponding to the vehicle speed difference ΔV 2-3 km/h. The output of the comparator circuit 25 resets the 7 limp 70 tube 3:3, and the output from the comparator circuit 26 resets the flip-flop 33.

Referring to FIG. 2, operation theory 1 of the vehicle speed difference discrimination circuit 24 is shown.
” The ninth graph shows n. When the vehicle speed difference is zero and the vehicle is running at the set vehicle speed set in the memory 13, the vehicle speed difference increases and reaches Δ■1,
The output of the comparison circuit 25 becomes high level, and the 7-lip flop 33 is set. When the vehicle speed difference is less than Δ■2 and approaches zero, the vcrj1 vehicle speed difference becomes Δ
When the voltage reaches v2, the output of the comparison circuit 26 becomes high level, and the 7-lip 70-tub 33 is reset.

The cent output Qld of the 7 limp 70 amp 33 is given to one input of the AND gate) G2. flipflop 2
The zero cent output QH1 is applied to the other input of the AND gate G2 via the delay circuit 34. The operation of the delay circuit 34 is shown in FIG. As shown in FIG. 3(1), the cent output Q of the flip-flop 20 reaches the time tl.
When it becomes high level at lζ, it becomes high level at time tsM after a predetermined time limit W1 has elapsed from time t1 of the delay circuit 34ri. Wl may be 1 second.

The output from the AND gate G2 is amplified by an amplifier circuit 35 and applied to an electromagnetic solenoid 36 for stopping the n1 overdrive previous operation.

A signal representative of the vehicle speed difference corresponding to the vehicle speed difference from line 14 is also provided to acceleration detection circuit 37 . The acceleration detection circuit 37 supplies a signal having an electric current corresponding to the acceleration of the vehicle body to one input of the comparison circuit 3B. Comparison circuit 3
At the other input of 8 there is seen an output 4 from a power source 39 having a voltage corresponding to a predetermined secondary speed. Comparison circuit 38
ri, a low level signal is derived when the acceleration is above the relative velocity determined by the source 39Vc, and a high level signal is derived when it falls below the predetermined relative velocity.

This comparison episode III! The output from 138 is provided to another input of AND gate G2. The set vehicle speed in the memory 13 is, for example, 80 km/h, and when the vehicle is traveling at a constant speed at that set speed, the flimp 70 knob 20 is in a centered state, and the duty control circuit 15 Therefore, the solenoid valve 8 of the actuator 4 is under duty control.
Thereupon, by operating the brake pedal knee/friction pedal 1, the flimp front 20 is reset, for example, by operating the accelerator pedal 3.
Assume that the vehicle is traveling at 0 krrv/b. In this case, the vcd and vehicle speed difference is greater than Δv1, and therefore the 7-lip flop 33 is centered. Also, 7 limps, 70 lamps, and 20 digits remain reset. Therefore, the electromagnetic slide/id 36 is demagnetized and remains at 9, and the gear position of the transmission is set to the highest gJIJ 4th speed.

If the resume switch 21 is operated while the vehicle is running while the accelerator pedal 3 is being operated in this manner, the fringe front panel 20 will be turned on. Therefore, AND gate 1
Duty control times 1ii through 3! A duty signal from 115 is applied to the solenoid valve 8V. Vehicle speed difference is ΔV2
During acceleration until reaching VC, the clip flop 33 remains at cent and 9. flip 70 nbu 20
After being delayed by the delay circuit 34, the 0 cent output QV is applied to the AND gate l-G2Vc. The acceleration of the vehicle body detected by the acceleration detector 37 is less than the acceleration corresponding to the voltage determined by the power source 39;
Therefore, it is assumed that the output of the comparison circuit W338 is at a high level. When the accelerator pedal 3 is released at the same time as the resume switch 21 is operated, so-called engine braking is applied while the transmission remains in fourth gear. This engine brake is weak because the gear position of the transmission is 17i (fourth speed) as described above, and the impact of deceleration is very small. Therefore, the time limit Il! of the delay circuit 34! In l1lWl,
The solenoid valve 8 is controlled by the output from the duty control circuit 15, and acceleration is performed while the nS transmission remains in the fourth gear.

After the resume switch 21 is operated, that is, after the time limit W1 has elapsed since the time when the clip fromb 20 was turned on, the delay circuit 34 derives a signal at the noise level to the AND game) G2, and this nVC causes the oat ( The electromagnetic solenoid 36 that stops the drive DJ operation is energized.Then, the gear stage of the transmission is changed to 3rd speed, which has a larger reduction ratio than 4th speed. Acceleration will occur in this state.

After operating the resume switch 21 with the IC in this way, the VC
In this case, the reduction ratio does not change for the time limit caused by the delay circuit 341, and the reduction ratio remains small, and after the time limit elapses, the reduction ratio increases and acceleration is performed.
After operating the resume switch, smooth acceleration will occur.

When the acceleration of the vehicle body is large, the output of the comparator circuit 38 remains at a low level, resulting in an AND game) G2.
The output from will be low level.

The electromagnetic solenoid 36rj that was used to stop the 9th Overdrive 1 work remains demagnetized, and the gear stage of the transmission cannot be switched from 4th gear, which has a small reduction ratio, to 3rd gear, which has a large reduction ratio. Prevented. When the acceleration is small, the output of the comparator circuit 38 is at a high level, and therefore the vehicle speed difference! Depending on the Plj separate circuit 24 and the cent output Q of the flimbu flomb 20, the AND condition of the AND gate G2 is allowed to be satisfied, and the n1 electromagnetic solenoid 36 can be excited #? :,
vKonaru. In this way, the overdrive operation is interrupted only when the acceleration is small and it is necessary to interrupt the overdrive operation, fC-for example, the lack of acceleration on the uphill road is reinforced.

As described above, according to the present invention, the gear ratio of the transmission is increased only when the acceleration is less than a predetermined value.
(As a result, sudden acceleration is performed only when acceleration is insufficient, and smooth driving is therefore possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a ninth graph explaining the vehicle speed difference "l'lJ separate circuit 24, and FIG. 3 is an explanation of the operation of the delay circuit 34. 1. Throttle valve, 3. Accelerator pedal, 4.
Actuator, 8... Solenoid valve, 9... Vehicle speed detection circuit, lO... Same wave number voltage converter, 12... Subtractor,
13...Memory, 15...Duty control circuit, 1
6...Sesoto inch, 20.33...Flipflop block, 21...Resume switch, 23...
Cancellation switch, 25, 26. 38... Comparison circuit, 34... Delay circuit, 36... Electromagnetic solenoid for stopping over F-Ripe operation, 37-... Acceleration detection circuit, Gl. G2...AND gate

Claims (1)

[Scope of Claims] A constant-speed running system W for a motor vehicle that transmits power from an internal combustion engine via a transmission and operates a resume switch so that the actual speed of the vehicle reaches a predetermined set speed to perform constant-speed driving, comprising: a means for detecting the acceleration of Wj; :What is the means to f? A constant speed traveling device for an automobile, comprising: