JP2655405B2 - 4-wheel drive vehicle control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-wheel drive vehicle control device, and more particularly to a control device for shutting off a delay control of an ignition timing according to a detection signal of a steering sensor by an ON operation signal of a full turn switch. A four-wheel drive vehicle control that smoothly performs a full turn of a four-wheel drive vehicle by delaying the ignition timing of the front engine by a predetermined delay amount fixed in advance to lower the engine output of the front engine from the engine output of the rear engine. Related to the device.

[Conventional technology]

There is a four-wheel drive vehicle having two engines, a front wheel engine mounted to drive the front wheels and a rear wheel engine mounted to drive the rear wheels.

This four-wheel drive vehicle is mainly used for car racing, etc.
Good cornering characteristics are secured by front and rear torque distribution control.

[Problems to be solved by the invention]

By the way, in the four-wheel drive vehicle control device, the same engine is mounted on each of the front and rear of the vehicle. When the vehicle is in a straight running state, the engine outputs of the front and rear engines are set to be the same, the occurrence of a braking action due to the output difference is prevented, and a sufficient straight running effect is ensured.

Also, when turning left or right, etc.
There is a long-felt need for measures to improve the steering characteristics by causing a difference in engine output between the front and rear engines, eliminating problems due to various conditions such as vehicle weight balance, corner conditions, and road surface conditions.

However, in the conventional four-wheel drive vehicle control device, the engine output of the front and rear engines is the same without causing a difference in the engine output of the front and rear engines.

As a result, at the time of cornering such as a left turn or a right turn, there is a disadvantage that the steering characteristics are reduced, the cornering cannot be performed smoothly, and the drivability is reduced.

[Object of the invention]

Therefore, an object of the present invention is to eliminate the inconvenience described above by interrupting the ignition timing delay control according to the detection signal of the steering sensor by the ON operation signal of the full turn switch, and controlling the front engine by a predetermined fixed delay amount. It is an object of the present invention to realize a four-wheel drive vehicle control device that can delay the ignition timing of the engine, lower the engine output of the front engine from the engine output of the rear engine, improve the steering characteristics, and achieve smooth cornering.

[Means for solving the problem]

In order to achieve this object, the present invention provides a four-wheel drive vehicle equipped with a front engine and a rear engine, respectively, and controls the front engine according to a detection signal from a steering sensor for detecting a steering angle amount of a driving operation unit. In a four-wheel drive vehicle control device having a torque distribution selection switch for changing a torque distribution between a front engine and a rear engine in the vicinity of the driving operation cloth while delay controlling the ignition timing, a full turn switch is provided in the vicinity of the driving operation portion, This full turn switch ON operation signal interrupts the ignition timing delay control according to the detection signal of the steering sensor, delays the front engine ignition timing by a predetermined fixed amount of delay, and controls the engine output of the front engine. Control to lower the engine output from the rear engine Characterized in that a control means that.

[Action]

With the above-described configuration, when the full-turn switch in the vicinity of the driving operation unit is turned on, the ignition signal corresponding to the detection signal of the steering sensor is detected by the on-operation signal of the full-turn switch according to the on-operation signal of the full-turn switch. By interrupting the delay control, the ignition timing of the front engine is delayed by a predetermined fixed amount of delay, the engine output of the front engine is made lower than the engine output of the rear engine, and the steering characteristics are improved to achieve smooth cornering. It's done.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 8 show an embodiment of the present invention. In FIGS. 1 to 3, 2 is a four-wheel drive vehicle, 4 is a front engine, 6 is a rear engine, 8 is a front wheel, 10 is a rear wheel, 12 is a first throttle for the front engine 4, and 14 is a rear throttle for the rear engine 6. Is a second throttle, 16 is an accelerator pedal, and 18 is a steering wheel. This steering wheel
A steering sensor 20 for detecting a steering angle amount is provided at 18. Then, as shown in FIG. 4, the ignition timing delay resistance value is varied in accordance with the steering angle amount detection signal from the steering sensor 20 to delay-control the ignition timing of the front engine 4.

A torque distribution selection switch 22 is provided in the vicinity of the steering wheel 18, which is a driving operation unit of the four-wheel drive vehicle 2, and is used to change the torque distribution between the front engine 4 and the rear engine 6. It is configured to be turned on.

Further, similarly to the torque distribution selection switch 22, a full turn switch 24 is provided near the steering wheel 18, which is a driving operation unit of the four-wheel drive vehicle 2, and a control means 26 for inputting an ON operation signal of the full turn switch 24 is provided. At the same time, this control means 26 is
-1 and the rear second control means 26-2. Further, the first and second control means 26-1 and 26-2 provide the engine output of the front engine 4 to the other rear engine 6
The engine output is made lower than the engine output.

The torque distribution by the control means 26 to which the ON signal of the full turn switch 24 has been input, that is, the change in the engine output decreases the engine output of the front engine 4 without changing the engine output of the rear engine 6.

Further, when the engine output of the front engine 4 is reduced by the control means 26, the ignition timing of the front engine 4 is delayed by a predetermined amount by the ON operation signal of the full turn switch 24. That is, when the ignition timing is delayed by a predetermined amount, the detection signal input from the steering sensor 20 to the control means 26 is cut off, and the delay is controlled by the predetermined delay signal.
Here, the full-turn state in cornering will be described in detail. In general, a cornering state exceeding 180 degrees is regarded as a full-turn state.

For example, the first control means 26-
One control circuit will be described with reference to FIG.

The first control means 26-1 includes first and second input / output units (I / O) 2
8-1, 28-2 and the first and second input / output units (I / O) 28-
CPU (Central Processing Unit) 30 connected to 1, 28-2 and R
It comprises an OM (fixed storage unit) 32 and a RAM (constant speed call storage unit) 34.

The first input-output unit (I / O) 28-1, an intake air amount sensor 36 and the throttle sensor 38, coolant temperature sensor 40, O ₂ sensor 42, a crank angle sensor 44 and the steering sensor 20, is respectively connected ing. An injector 46, an EGR solenoid valve 48, an ignition coil 50, and a throttle control motor 52 are connected in parallel to the second input / output unit (I / O) 28-2. A battery 54 and a key switch 56 are connected to those connected to the input / output unit (I / O) 28-2.

Since the rear second control means 26-2 is also configured in the same manner as the front first control means 26-1, the description is omitted here.

Reference numeral 58 denotes a first accelerator wire of the front engine 4, 60 denotes a second accelerator wire of the rear engine 6, 62 denotes a first ignition unit for the front, and 64 denotes a second ignition unit for the rear.

The schematic configuration of the four-wheel drive vehicle 2 will be described in detail. In FIG. 5, reference numeral 66 denotes an air cleaner, and 68 denotes an intake passage. A cold start injector 70 is provided in the middle of the intake passage 68, the intake passage 68 upstream of the injector 70 is defined as a first intake passage 68-1, and the intake passage 68 downstream of the injector 70 is defined as a second intake passage 68-1. The intake passage is 68-2.

Further, the second intake passage 68-2 is opened and terminated to the combustion chamber 74 of the front engine 4 via the intake valve 72. In the combustion chamber 74, an opening starts at an exhaust passage 78 via an exhaust valve 76, and a catalyst converter 80 composed of a three-way catalyst for performing exhaust post-treatment is provided in the exhaust passage 78.

The injector 70 is configured to be controlled by the control means 26.

Further, a first intake passage 68-downstream of the air cleaner 66 is provided.
1 is provided with an intake air temperature sensor 82 for detecting the intake air temperature.

Reference numeral 84 denotes a fuel tank, 86 denotes a canister, 88 denotes a distributor, 90 denotes a throttle sensor, 92 denotes an engine cooling fan, and 94 denotes an air flow meter.

Next, the operation will be described with reference to the flowchart for engine output control of the four-wheel drive vehicle in FIG.

First, the four-wheel drive vehicle 2 is started, and is set to start (100).

Then, it is determined whether or not the full turn switch 24 has been turned ON (102). If YES, the ignition timing delay control according to the detection signal of the steering sensor 20 is interrupted, and the ignition timing is determined. The engine is delayed by a fixed amount, and the front engine 4 is controlled by a predetermined delay amount to reduce the engine output of the front engine 4 (104).

When the determination (102) as to whether or not the full turn switch 24 has been turned ON is NO, the steering sensor 2
Based on the detection signal from 0, it is determined whether or not a steering switch (not shown) is ON, that is, whether or not the four-wheel drive vehicle 2 is in a cornering state of turning left or right (106).

If the determination (106) is NO, the vehicle is running straight, and the engine output of the front engine 4 and the rear engine 6 are made the same without decreasing the engine output of the front engine 4 (108).

If the determination (106) is YES, the torque distribution selection switch 22 for reducing the engine output of the front engine 4 when reducing the engine output of either the front engine 4 or the rear engine 6 is used. Is determined (110) as to whether the signal is the ON operation signal.

If the determination (110) is NO, the ignition timing of the front engine 4 is delayed and controlled according to the steering angle detected by the steering sensor 20, and the engine output of the front engine 4 is reduced (112).

If the determination (110) is YES, the ignition timing of the rear engine 6 is delay-controlled in accordance with the steering angle detected by the steering sensor 20 when the steering angle is small, for example, when making a left turn or a right turn. (114).

Further, the engine output control will be described in detail with reference to the flowcharts of FIGS.

It is determined whether or not to perform the ignition timing delay control based on the presence or absence of the operation state of the steering wheel 18 in FIG. That is, when the vehicle is in the straight traveling state, the delay control of the ignition timing is not performed, and the engine outputs of the front and rear engines 4 and 6 are made the same.

Further, at the time of left or right turn cornering, ignition timing delay control is performed depending on whether or not this cornering makes a full turn. That is, in the full-turn state, the ignition timing delay control according to the detection signal of the steering sensor 20 is interrupted, and the ignition timing of only the front engine 4 is delay-controlled by a fixed predetermined delay amount.
Perform a full turn by the power slide method.

Further, at the time of cornering up to about U-turn other than the full turn, the engine output of either the front engine 4 or the rear engine 6 is reduced by delay control of the ignition timing according to the detection signal of the steering sensor 20, and the FF characteristic or RR One of the desired characteristics is exhibited.

Thereby, when the ON operation signal of the full turn switch is input to the control means, the ignition timing delay control according to the detection signal of the steering sensor is interrupted, and the ignition of only the front engine is performed by a fixed predetermined delay amount. The timing delay control is performed, and a full turn can be performed by the power slide method. The steering characteristics are improved and smooth cornering can be achieved, which is practically advantageous.

Also, when cornering up to about U-turn other than full turn, the engine output of either the front engine or the rear engine can be reduced by delay control of the ignition timing according to the detection signal of the steering sensor, so that the FF characteristics or One of the desired RR characteristics can be exhibited, and the drivability during cornering can be improved.

Further, by performing the ignition timing delay control to reduce the engine output of either the front engine or the rear engine, the response at the time of the ignition timing delay control according to the steering angle detected by the steering sensor is improved. Thus, reliable ignition timing delay control can be achieved, and usability can be improved.

Note that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the above-described embodiment, only the engine output of the front engine is reduced without changing the engine output of the rear engine in the above-described embodiment. A configuration that controls to reduce the engine output of the front engine while increasing the engine output of the rear engine, or to increase only the engine output of the rear engine without changing the engine output of the front engine. It is also possible.

In the above embodiment, the present invention is configured to control the engine output of one of the front and rear engines mounted on a normal four-wheel drive vehicle so as to reduce the engine output. The engine output control in the above embodiment can be applied to a driven vehicle.

〔The invention's effect〕

As described in detail above, according to the present invention, a front engine and a rear engine are respectively mounted on a four-wheel drive vehicle,
Torque distribution selection that delays the ignition timing of the front engine according to the detection signal from the steering sensor that detects the steering angle amount of the driving operation unit, and changes the torque distribution between the front engine and the rear engine near the driving operation unit In a four-wheel drive vehicle control device having a switch, a full turn switch is provided in the vicinity of a driving operation unit, and a delay control of an ignition timing according to a detection signal of a steering sensor is cut off by an ON operation signal of the full turn switch, and the control is fixed in advance. Control means is provided for delaying the ignition timing of the front engine by a predetermined delay amount and controlling the engine output of the front engine to be lower than the engine output of the rear engine, so that a full turn switch ON operation signal is input to the control means. When the steering signal is detected, The ignition timing to block the delay control Flip was,
By delaying the ignition timing of the front engine by a predetermined delay amount fixed in advance, the engine output of the front engine can be made lower than the engine output of the rear engine, a smooth full turn can be performed, and steering characteristics can be improved. It can be improved and is practically advantageous. Also, during cornering other than full turn, the engine output of either the front engine or the rear engine can be reduced by delay control of the ignition timing according to the detection signal of the steering sensor, so that the FF characteristics or RR characteristics can be reduced. It can be exerted and the drivability during cornering can be improved. Furthermore, the ignition timing of the front engine is delayed and controlled in accordance with a detection signal from a steering sensor for detecting a steering angle amount of the driving operation unit, and a retard system is adopted in which only the engine output of the front engine is reduced. The responsiveness of the ignition timing delay control in accordance with the detected steering angle of the driving operation unit is improved, and the ignition timing delay control can be reliably performed, thereby improving the usability.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention, FIG. 1 is a schematic diagram of an operation mechanism of a four-wheel drive vehicle control device, FIG. 2 is a schematic diagram of a control mechanism of a four-wheel drive vehicle control device, FIG. FIG. 4 is a schematic diagram of control means of the four-wheel drive vehicle control device, FIG. 4 is a diagram showing a relationship between steering operation and an ignition timing control resistance value, and FIG. 5 is a schematic diagram of a control mechanism of the four-wheel drive vehicle control device. FIG. 6 is a control flowchart of the four-wheel drive vehicle control device, and FIGS. 7 and 8 are schematic flowcharts showing ignition timing delay control by a full turn switch. In the figure, 2 is a four-wheel drive vehicle, 4 is a front engine,
6 is a rear engine, 8 is a front wheel, 10 is a rear wheel, 16 is an accelerator pedal, 18 is a steering wheel, 20 is a steering sensor, 22 is a torque distribution selection switch, 24 is a full turn switch, 26 is a control means, and 26-1 is a control means. Front first control means, 26-2 a rear second control means, 28-1 and 28-2 first and second input / output units (I / O), 30 a CPU (central processing unit), 32 ROM (fixed memory unit), the RAM (constant speed access memory unit), the intake air amount sensor 36 34, 38 a throttle sensor, a cooling water temperature sensor 40, 42 is the O ₂ sensor 44 is a crank angle sensor, 46 is an injector, 50 is an ignition coil, 54 is a battery, and 56 is a key switch.

Claims (1)

(57) [Claims] 1. A four-wheel drive vehicle having a front engine and a rear engine mounted thereon, and delaying ignition timing of the front engine in accordance with a detection signal from a steering sensor for detecting a steering angle of a driving operation unit. A four-wheel drive vehicle control device having a torque distribution selection switch for changing the torque distribution between the front engine and the rear engine in the vicinity of the driving operation unit, wherein a full-turn switch is provided in the vicinity of the driving operation unit; Signal, the ignition timing delay control is interrupted in accordance with the detection signal of the steering sensor, the ignition timing of the front engine is delayed by a predetermined fixed amount of delay, and the engine output of the front engine is reduced by the engine output of the rear engine. Provision of control means for controlling to lower than output Four-wheel drive vehicle control device according to claim.