JPH0328350B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a power steering control device, more specifically, a power steering device in which a pump is driven by a motor whose rotational speed is feedback-controlled. The present invention relates to a steering control device.

In the case of a power steering device, fluctuations in the steering assist force that occur thereby impair steering stability and are a major cause of inhibiting the steering performance of a vehicle. For this reason, various power steering control devices have been proposed to eliminate this variation in steering assist force, and the applicant has already proposed a power steering control device as shown in FIG. The illustrated power steering control device is installed in a power steering device in which a pump is driven by a motor, and performs feedback control of the rotation speed of the motor. In the figure, 11 is a steering wheel, and 12 is connected to the steering wheel 11. power steering control device 12.
The pump 1 is driven by a shunt motor 13.
4 pressurizes and supplies the working fluid in the reservoir 15. The shunt motor 13 has a field winding 13a on the stator side and an armature winding 13b on the rotor side, and the field winding 13a and the armature winding 13b are
One end of each is grounded, and the other end is connected to a control circuit 16, which will be described later.

17 is a vehicle speed detection means for detecting the vehicle speed and outputting a pulse signal with a number of pulses proportional to the vehicle speed;
Reference numeral 8 denotes a rotation speed detection means for detecting the rotation speed of the shunt motor 13 and outputting a pulse signal with a pulse number proportional to the rotation speed, and 19 is a steering detection means for detecting the steering of the steering wheel 11. The vehicle speed detection means 17 is connected to a vehicle speed voltage conversion circuit 20, and the rotation speed detection means 18 is connected to a rotation speed voltage conversion circuit 21. The vehicle speed voltage conversion circuit 20 converts the pulse signal output from the vehicle speed detection means 17 into a voltage signal with a value proportional to the number of pulses, and also amplifies the voltage signal (V) by a predetermined amplification factor _A1 . It is output to the comparison circuit 22. Similarly, the rotation speed voltage conversion circuit 21 converts the output signal of the rotation speed detection means 18 into a voltage signal with a value proportional to the number of pulses, and then
It is amplified by a predetermined amplification factor A ₂ and outputs this amplified signal (R) to the comparison circuit 22 . Comparison circuit 22
is connected to the current amplification circuit 23, and outputs a voltage signal determined by comparing two input signals (V) and (R) to the current amplification circuit 23. Current amplifier circuit 2
3 is connected via the ignition switch 24 to a battery 25, which is a power source whose one end is grounded, and is also connected to the field winding 13a of the shunt motor 13, and is connected to the value of the signal input from the comparator circuit 22. A current having a current value corresponding to the current value is applied to the field winding 13a.

The steering detection means 19 is connected to the armature current control circuit 26. The steering detection means 19 normally detects the steering force applied to the steering wheel 11 or the steering angle from the neutral position of the steering wheel 11, and determines that the steering wheel 11 is in a steering state when these values exceed a predetermined value. The steering signal is output to the armature current control circuit 26. The armature current control circuit 26 is connected to the battery 25 via the ignition switch 24 and is connected to the armature winding 1 of the shunt motor 13.
Connected to 3b. This armature current control circuit 2
6 connects the armature winding 13b to the power source 25 when a steering signal indicating that the steering wheel 11 has been steered is input from the steering detection means 19;
A current of a predetermined value is applied to the armature winding 13b. These vehicle speed voltage conversion circuit 20 , rotation speed voltage conversion circuit 21 , comparison circuit 22 , current amplification circuit 23 , and armature current amplification circuit 26 constitute a control circuit 27 .

Such a power steering control device stops driving the pump 14 when the steering wheel 11 is not being steered to save energy consumed by the power steering device 12, and also to reduce energy consumed by the power steering device 12 when the vehicle is running at high speed. In this case, the amount of working fluid discharged by the pump 14 to the power steering device 12 is reduced compared to when the vehicle is running at low speed, thereby improving longitudinal stability. That is, this power steering control device performs feedback control on the current value applied to the field winding 13a of the shunt motor 13 in accordance with the vehicle speed so that it is large when the vehicle is running at high speeds and is small when the vehicle is running at low speeds. The winding 13b is turned on so that a predetermined current is applied only when the steering wheel 11 is steered.
-OFF control. Therefore, the pump 14 driven by the shunt motor 13 is driven by the shunt motor 13.
Due to the characteristics, when the steering wheel 11 is steered when driving at high speed, it is driven at low rotation speed and discharges a relatively small amount of working fluid to the power steering device 12, and when the steering wheel 11 is steered when driving at low speed. The power steering device 12 is driven at high rotation speed and supplies a relatively large amount of working fluid.
Discharge to.

However, in such a power steering control device, the ignition switch 14
is in the connected state, and when the steering detection means 19 detects the steering of the steering wheel 11, the shunt motor 13 is driven. , or detecting the rotational displacement angle of the steering wheel 11 from the neutral position,
If this steering force or rotational displacement is greater than or equal to a predetermined value, it is determined that the steering wheel 11 has been steered. Therefore, for example, if the engine suddenly stops and the ignition switch 24 is in the connected state while the steering wheel 11 is rotating, or if the engine stops and the ignition switch 24 is in the connected state, If the driver inadvertently steers the steering wheel 11 when the vehicle is in the state, the shunt motor 13 rotates and the capacity of the battery 25 decreases.
There was a risk that it would be difficult to start the engine. Furthermore, if the steering wheel 11 is steered at the time of starting to drive the starter motor, current is applied to the shunt motor 13 as described above, so if the capacity of the battery 25 has decreased, the starter motor cannot be started. There was a risk that sufficient current would not be supplied to the motor, making it difficult to start the engine.

The present invention has been made in view of this inconvenience, and includes a start detecting means for determining the starting state of the engine, and when a signal from the start detecting means indicating that the engine is in the starting state is input, It is an object of the present invention to provide a power steering control device that stops the motor by stopping the supply of current to the motor, thereby eliminating the above-mentioned inconvenience.

The present invention will be explained below based on the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention.

First, the configuration will be explained. Note that the same parts as those of the power steering control device according to the prior application described above will be described with the same numbers.

Reference numeral 11 indicates a steering wheel, and 12 indicates a power steering device connected to the steering wheel 11 via a steering shaft. The power steering device 12 includes a power cylinder and the like to which pressurized working fluid is supplied,
The manual steering force applied to the steering wheel 11 is increased and transmitted to the steering wheels 28. A pump 14 pressurizes the working fluid in the reservoir 15 and supplies it to the power cylinder of the power steering device 12. The pump 14 is driven by the shunt motor 13. The shunt motor 13 includes a field winding 13a on the stator side, an armature winding 13b on the rotor side,
have. Field winding 13a of shunt motor 13
has one end grounded and the other end connected to control circuit 1, which will be described later.
It is connected to the current amplification circuit 23 of No. 6. Also,
The armature winding 13b of the shunt motor 13 is also grounded at one end, and connected at the other end to an armature current control circuit 26 of a control circuit 16, which will be described later.

17 is a vehicle speed detection means for detecting the speed of the vehicle and outputting a pulse signal with a number of pulses proportional to the speed;
Reference numeral 8 denotes rotation speed detection means for the motor 13 for feedback controlling the rotation speed of the shunt motor 13;
29 detects the steering of the steering wheel 11 and outputs a steering signal (S) only when the steering wheel 11 is steered; 29 detects the ignition pulse of the engine (not shown) and detects the engine's ignition pulse; This is an ignition pulse detection means that outputs a pulse signal with a number of pulses proportional to the rotation speed. The vehicle speed detection means 17 is connected to the vehicle speed voltage conversion circuit 20.
The output signal of the vehicle speed detection means 17 is amplified to a predetermined degree.
A Voltage signal (V) with a value proportional to vehicle speed amplified by ₁
Output as . The motor rotation speed detection means 18 is
The rotation speed of the shunt motor 13 is detected and a signal corresponding to the rotation speed is output to the rotation speed voltage conversion circuit 21. The rotational speed voltage conversion circuit 21 amplifies the output signal of the motor rotational speed detection means 18 by a predetermined amplification degree A ₂ to generate a voltage signal (R) proportional to the rotational speed of the shunt motor 13.
Output. 22 is a signal (V) connected to the vehicle speed voltage conversion circuit 20 and the rotation speed voltage conversion circuit 21.
(R) is the input comparison circuit. Comparison circuit 22
has an internal signal (Va) that changes in response to the output signal (V) of the vehicle speed voltage conversion circuit 20, and compares this internal signal (Va) with the output signal (R) of the rotation speed voltage conversion circuit 21. Then, both these signals (Va)
A signal corresponding to the voltage difference between (R) is output. This internal signal (Va) is for changing the rotation speed of the shunt motor 13 in accordance with the vehicle speed, and its value decreases as the value of the signal (V) from the vehicle speed detection means 17 increases. That is, this comparison circuit 22
is 2 when the internal signal (Va) is larger than the signal (R) from the rotation speed detection means 18 (Va>R).
Voltage difference (Δν) between two signals (Va) (R) (Δν=Va
−R), and if the signal (Va) and the signal (R) are the same value (Va=R), a signal (Z) with a value of zero, for example, is output.
Furthermore, if the signal (Va) is smaller than the signal (R) (Va<R), the voltage difference (-Δν) between the two signals (Va) (R) (-Δν=Va-R)
For example, a negative signal (N) corresponding to the current amplification circuit 23 is outputted.

The ignition pulse detection means 29 is connected to the determination circuit 30 and outputs to the determination circuit 30 a pulse signal having a pulse number proportional to the engine rotation speed. The output terminal of the determination circuit 30 is connected to the current amplification circuit 23 and the armature current control circuit 26, respectively. This determination circuit 30 determines that the engine is in the starting state when the pulse signal output by the ignition pulse detection means 29 is less than or equal to a predetermined number of pulses (when the number of revolutions of the engine is less than or equal to a predetermined number of revolutions). The starting signal having a predetermined voltage value is transmitted to the current amplifier circuit 23 and the armature current control circuit 2.
Output to 6. These ignition pulse detection means 29 and determination circuit 30 are connected to the start detection means 2
7.

The steering detection means 19 includes an armature current control circuit 26
is connected to. This steering detection means 19 determines the steering of the steering wheel 11 based on the steering force applied to the steering wheel 11 or the steering angle from the neutral position of the steering wheel 11, and when the steering force exceeds a predetermined value, or When the rotation angle displacement etc. of the steering wheel 11 from the neutral position exceeds a predetermined value, it is determined that the steering wheel 11 is in the steering state and a steering signal is output to the armature current control circuit 26. Note that the steering detection means 19 in this embodiment makes the determination based on the steering force applied to the steering wheel 11.

The armature current control circuit 26 is connected via the ignition switch 24 to a power source 25 whose one end is grounded, and also connects to the armature winding 1 of the shunt motor 13.
Connected to 3b. This armature current control circuit 2
6 makes the battery 25 and the armature winding 13b conductive while the steering signal from the steering detection means 19 is input, and supplies a predetermined current to the armature winding 13b. While the start signal is input, the armature winding 13b and the battery 25 are cut off regardless of the presence or absence of the steering signal.

A current amplification circuit 23 connected to the comparison circuit 22 and the determination circuit 30 is connected to the battery 25 via the ignition switch 24 and to the field winding 13a of the shunt motor 13. When the signal (P) is input from the comparator circuit 22, the current amplification circuit 23 converts the signal (P) into
From battery 25 to field winding 1 according to the size of
3a, and when the signal (Z) is input, the current value flowing from the power supply 25 to the field winding 13a is maintained unchanged, and furthermore, the signal (N) is input, field winding 13a corresponds to this signal (N) value.
Increase the current value applied to the Furthermore, while the start signal is input from the determination circuit 30, the current amplification circuit 23 controls the shunt motor 13 regardless of the signals (P), (Z), and (N) input from the comparison circuit 22. The field winding 13a and the battery 25 are cut off.

The above-mentioned vehicle speed voltage conversion circuit 20, rotation speed voltage conversion circuit 21, comparison circuit 22, current amplification circuit 23,
The armature current control circuit 26 and the determination circuit 30 are
A control circuit 16 is configured.

Next, the effect will be explained.

The power steering device exemplified in this embodiment is configured to be vehicle speed sensitive and includes a vehicle speed detection means 17, and the steering assist force generated is set to be small in a high vehicle speed range and large in a low vehicle speed range. Therefore, the rotation speed (R) of the shunt motor 13 that drives the pump 14 is as shown in FIG.
It is set to decrease as the vehicle speed (V) increases, and the amount of fluid discharged by the pump 14 decreases as the vehicle speed increases. Further, a shunt motor 13 is used in the illustrated power steering device. As is well known, this shunt motor 13 is
The driving torque increases as the current value applied to the field winding 13a increases, and the rotation speed decreases as the current value applied to the field winding 13a increases. Therefore, the illustrated control device controls the current value applied to the field winding 13a of the shunt motor 13 so that it is large in a high vehicle speed range and small in a low vehicle speed range.

If the vehicle is currently running at a certain speed, the vehicle speed detection means 17 detects the vehicle speed and, as described above,
A voltage signal (V) having a value corresponding to the vehicle speed is input to the comparison circuit 22 .

Here, if the steering wheel 11 is not being steered, for example, the steering wheel 11
If the steering force applied to the armature current control circuit 26 is less than a predetermined value, as described above,
disconnects the armature winding 13b of the shunt motor 13 from the battery 25, and the shunt motor 13 is stopped. Therefore, the signal (R) input from the rotation speed detection means 18 to the comparison circuit 22 has a value corresponding to zero rotation speed. Then, the comparison circuit 22 calculates the voltage difference (Δν) between the internal signal (Va) corresponding to the input signal (V) and the signal (R), and generates a signal (P) for increasing the rotation speed, that is, as described above. A positive value signal (P) is output. Therefore, the current amplification circuit 23 supplies a current having a value corresponding to this signal (P) from the battery 25 to the field winding 1 of the shunt motor 13.
3a is energized.

When the steering wheel 11 is not operated in this manner, the armature winding 13a of the shunt motor 13 is not energized and the shunt motor 13 does not rotate, reducing the power consumed by the power steering device 12. do.

Furthermore, when the steering wheel 11 is operated with a steering force greater than a predetermined steering force, as described above,
The armature winding 13b of the shunt motor 13 is energized and the motor 13 rotates. Therefore, the rotation speed detection means 18 detects this rotation speed and compares it with the comparison circuit 4.
3, a voltage signal (R) having a value proportional to the rotational speed is input. On the other hand, as described above, a signal (V) proportional to the vehicle speed is input to the comparison circuit 22. Therefore, the comparison circuit 22 compares the values of the internal signal (Va) corresponding to the signal (V) and the signal (R), and
The aforementioned signals (P), (Z), and (N) are output depending on the magnitude of the signal values (Va) and (R). That is, when the signal (N) is input, the current amplification circuit 23 increases the value of the current flowing through the field winding 13a of the motor 13 to reduce the rotation speed of the motor 13 to a predetermined rotation speed. In addition, when the signal (Z) is input, the current value of current being energized is maintained and the current rotation speed of the motor 13 is maintained, and furthermore, when the signal (P) is input, In this case, the number of rotations of the motor 21 is increased to a predetermined number of rotations by decreasing the current value. Therefore, the shunt motor 13 always rotates at a rotational speed corresponding to the vehicle speed to drive the pump 19. Therefore, the fluid supplied from the pump 14 to the power cylinder of the power steering device 12 changes depending on the vehicle speed, and at high speeds, a small amount,
At low speeds, the amount of steering force is large, and the steering force generated by the power cylinder is small at high speeds and becomes large at low speeds, corresponding to the vehicle speed.

In this way, when steering the staying wheel 11 while the vehicle is running, the rotation speed signal of the shunt motor 13 is input, and the shunt winding is performed so that this rotation speed signal matches the vehicle speed signal. Motor 1
3 rotation speed is feedback controlled. Therefore,
Even if the load on the pump 14 or motor 13 changes due to a change in the valve opening of the control valve or a change in the viscosity of the working fluid, the rotation speed of the shunt motor 13 will always be at a value corresponding to the vehicle speed. Since there is no fluctuation in the steering assist force generated by the power steering device, it is possible to obtain comfortable steering performance.

Furthermore, even if the vehicle speed changes due to the steering state of the steering wheel 11, the signal (V) corresponding to the vehicle speed input to the comparator circuit 22 changes its value and changes the rotation speed of the motor 13. do. Therefore, even when the steering resistance changes due to a change in vehicle speed, the driver can always obtain a constant steering angle with a constant steering force, thereby providing a comfortable steering feeling.

Furthermore, when starting the engine, the engine is stopped and the pulse signal detected by the ignition pulse detection means 29 has a pulse number of zero. Therefore, the determination circuit 30 outputs a starting signal to the current amplification circuit 23 and the armature current control circuit 26, and the current amplification circuit 23 outputs a starting signal to the shunt motor 13.
The armature current control circuit 26 disconnects the armature winding 13b of the shunt motor 13 from the battery 25. Therefore, the field winding 13a and the armature winding 13b of the shunt motor 13 are connected to the steering wheel 1.
1 is steered, no current is applied and the shunt motor 13 does not rotate. In this way, when starting an engine that supplies a large current to the starter motor, the motor 1
Since each of the windings 13a and 13b of No. 3 is disconnected from the battery 25 and no current is applied to the motor 13, sufficient current is supplied to the starter motor and the engine can be started successfully.

Thereafter, the engine starts rotating, and the ignition pulse detection means 29 outputs a pulse signal with a number of pulses proportional to the engine rotational speed to the determination circuit 30. Then, the determination circuit 30 outputs a starting signal to the current amplification circuit 23 and the armature current control circuit 26 until this pulse signal reaches a predetermined number of pulses, that is, until the engine rotational speed reaches a predetermined rotational speed. Therefore, each winding 1 of the shunt motor 13
3a and 13b are not energized until the engine reaches a predetermined rotation speed even when the steering wheel 11 is steered. In this way, when the engine rotation speed is unstable below the predetermined rotation speed, the power supply to the shunt motor 13 is stopped to reduce the load on the alternator, that is, the load on the engine, so that the engine rotates stably. .

Further, even if the driver accidentally turns the steering wheel 11 when the engine is stopped and the ignition switch 24 is in the connected state, the shunt motor 13 will not rotate. That is, when the engine speed is below a predetermined value, the determination circuit 30 outputs a starting signal to the current amplification circuit 23 and the armature current control circuit 26 as described above, so that the shunt motor Each of the 13 windings 13a and 13b is not energized. Therefore, a reduction in battery capacity due to such driver malfunction can be prevented.

Moreover, the effect of not driving the motor at the time of starting the engine is particularly effective when the rotation speed of the motor is feedback-controlled in accordance with the vehicle speed. That is, since most of the time when the engine is started is when the vehicle is stopped, if the above measures are not taken, the motor will be driven at the highest rotational speed, resulting in large power consumption.

FIG. 3 shows another embodiment.

In this embodiment, the engine start detection means is comprised of a voltage regulator 31 built into or attached to the alternator.

As is well known, the alternator (not shown) is provided with a voltage regulator 31 that keeps its output voltage constant, and the voltage regulator 31 detects the output voltage of the alternator and adjusts the field current of the alternator. By controlling the output voltage, the output voltage is controlled. A charge lamp 32 is disposed between the output end of the voltage regulator 31 and the battery 25 to indicate that the charging system consisting of the alternator, voltage regulator 31, etc. is operating normally. , the output end of the voltage regulator 31 is connected to the aforementioned current amplification circuit 23 and armature current control circuit 26.

In such a voltage regulator 31, when the alternator is not generating power at a specified rotational speed of the engine or less, the voltage at its output terminal becomes a low potential, the charge lamp 32 lights up, and the current amplifier circuit 23 and armature current This low potential signal is output to the control circuit 26. Further, when the engine rotates above the specified rotation speed and the alternator is generating electricity, the output terminal voltage of the voltage regulator 31 becomes a high potential, the charge lamp 32 goes out, and the current amplifier circuit 23 and the armature current control A high potential signal is output to the circuit 26. Therefore, these current control circuit 23 and armature current control circuit 26 disconnect each winding 13a, 13b of the shunt motor 13 from the battery 25 when the above-mentioned low potential signal is input, and also disconnect the windings 13a and 13b from the battery 25 when the high potential signal is input. Then, each winding 13a, 13b is connected to the battery 25, and the shunt motor 13 is driven. Note that the other configurations and operations are the same as those of the above-described embodiment, and their explanation will be omitted.

As described above, in this embodiment, as in the previous embodiment, when the charging system of the vehicle is not charging, that is, when the engine rotation speed is below a predetermined rotation speed and the rotation is unstable, the shunt Since the power supply to the motor 13 is stopped, the engine can be started smoothly, and a decrease in battery capacity due to driver's carelessness can be prevented. Further, in this embodiment, since the start detection means is configured using the voltage regulator 31 already installed in the vehicle, this power steering control device is inexpensive.

FIG. 5 shows another embodiment.

In this embodiment, a vehicle speed determination circuit 32 is provided which determines when the vehicle speed is below a predetermined value and outputs a signal. The vehicle speed determination circuit 32 inputs the signal from the vehicle speed voltage conversion circuit 20 and outputs a signal when the vehicle speed is below a predetermined value, and does not output a signal when the vehicle speed is higher than that. Product circuit 33
The signal from the determination circuit 30 is input to the other input terminal of the AND circuit 33, and the output of the AND circuit 33 is input to the armature current control circuit 26. There is. The AND circuit 33 outputs a signal when signals are input to both input terminals, and disconnects the field winding 13a of the shunt motor 13 and the battery 25. When the vehicle speed is below a predetermined value, the vehicle speed discrimination circuit 32 outputs a signal to one input terminal of the AND circuit, so that the same operation as in the embodiment described above is performed in response to the signal from the discrimination circuit 30. On the other hand, when the vehicle speed is higher than a predetermined value, no signal is output from the vehicle speed discrimination circuit 32, and no signal is output from the AND circuit 33 regardless of the output from the discrimination circuit 30. Therefore, the shunt motor 13 is driven in response to a signal from the steering detection means 19.

According to this embodiment, the shunt motor 13 is driven even if the engine stops when the vehicle speed is higher than a predetermined speed, so that the shunt motor 13 is driven when the engine suddenly stalls while the vehicle is running or the wheels tend to stall due to sudden braking. too,
This ensures the operation of the power steering and prevents the danger of the steering becoming suddenly heavy. Note that when the vehicle speed is below a predetermined value, for example, when starting an engine that is stopped, the shunt motor 13 is not driven, so that the same effect as in the embodiment described above can be obtained.

As described above, according to the present invention, the pump is provided in a power steering device driven by a motor, and the rotation speed detection detects the rotation speed of the motor and outputs a signal corresponding to the rotation speed. a steering detection means for detecting the steering of a steering wheel; a vehicle speed detection means for detecting a vehicle speed and outputting a signal corresponding to the vehicle speed; energizing the motor to rotate the motor only when the
The output signals of the vehicle speed detection means and the rotation speed detection means are input, and the current value applied to the motor is changed in accordance with the vehicle speed, and the rotation speed of the motor is fed back so that it is small at high vehicle speeds and becomes large at low vehicle speeds. A power steering control device comprising: a control circuit for controlling a power steering controller, further comprising a start detecting means for determining a start state of the engine;
When a signal indicating that the engine is in a starting state is inputted from the start detecting means, the current supply to the motor is stopped, so that the battery load at the time of starting the engine is reduced and the engine is not started. In addition to this, it is possible to prevent the battery capacity from decreasing due to driver's malfunction.

Furthermore, in the embodiment shown in FIG. 2, since the start detection means determines the start state based on the engine rotation speed, it is possible to control the motor even when the vehicle is running. This has the effect of improving performance.

Furthermore, in the embodiment shown in FIG. 3, the start detection means determines the start state based on the terminal voltage of a voltage regulator normally used in an alternator, so this power steering control device is inexpensive. This effect can be obtained.

Furthermore, in the embodiment shown in FIG. 5, the motor can be driven even when the engine is stopped at a predetermined vehicle speed or higher, so that safe driving is possible even if the engine suddenly stops while the vehicle is running.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a power steering control device according to the prior application, FIG. 2 is a block diagram showing a power steering control device according to an embodiment of the present invention, and FIG. 3 is a block diagram showing a power steering control device according to another embodiment of the present invention. A block diagram showing such a power steering control device, FIG. 4 is a diagram showing the characteristics of the rotational speed of the motor controlled by the power steering control device of FIG. 2 with respect to vehicle speed, and FIG. 5 is a diagram showing another embodiment of the present invention. FIG. 2 is a diagram showing a power steering control device according to the present invention. 11... Steering wheel, 12... Power steering device, 13... Shunt motor, 14
... Pump, 16 ... Control circuit, 17 ... Vehicle speed detection means, 18 ... Rotation speed detection means, 19 ... Steering detection means, 27 ... Start detection means, 31 ... Voltage regulator (start detection means) ).

Claims (1)

[Scope of Claims] 1. A pump is provided in a power steering device driven by a motor, and includes rotation speed detection means for detecting the rotation speed of the motor and outputting a signal corresponding to the rotation speed, and a rotation speed detection means for steering the steering wheel. a steering detection means for detecting a vehicle speed; a vehicle speed detection means for detecting a vehicle speed and outputting a signal corresponding to the vehicle speed; and a vehicle speed detection means for detecting a vehicle speed and outputting a signal corresponding to the vehicle speed; Applying current to the motor to rotate the motor,
The output signals of the vehicle speed detection means and the rotation speed detection means are inputted, and the current value applied to the motor is changed in accordance with the vehicle speed, and the rotation speed of the motor is fed back so that it is small at high vehicle speeds and becomes large at low vehicle speeds. A power steering control device comprising a control circuit for controlling a power steering system, further comprising a start detecting means for determining a start state of the engine, the control circuit comprising:
A power steering control device, characterized in that when a signal indicating that the engine is in a starting state is input from the starting detection means, the current supply to the motor is stopped. 2. Claim 1, wherein the start detection means outputs a signal indicating the start state when the ignition switch is in the closed state and the engine is at a predetermined rotation speed or less. The power steering control device described. 3. The control circuit has a vehicle speed determination circuit that inputs a signal corresponding to the vehicle speed from the vehicle speed detection means, and stops supplying current to the motor only when the vehicle speed is a predetermined value or less. A power steering control device according to claim 1 or 2.