1. The electronic control unit (ECU) mainly consists of input circuits, A/D converters, computers, and output circuits.(√) 11
2. The electronically controlled gasoline injection system utilizes negative pressure generated in the throat of the throttle above the throttle valve during air flow to draw out gasoline, which is then atomized and delivered to the engine.
(×)
2. After the signal from the sensor is input into the ECU, it is primarily processed through the input circuit, where both digital and analog signals are directly input into the microcomputer.(×)
3. The function of the intake system is to control and measure the amount of air entering the cylinder during the engine’s operation. The air flow is automatically drawn in due to the negative pressure generated by the combustion of gasoline in the engine and is uncontrollable.()
4. In zirconia (ZrO2) oxygen sensors, the solid electrolyte of zirconia allows easy movement of oxygen ions at high temperatures, creating an electric effect due to oxygen concentration differences, thus requiring a ceramic heater.(×)
1. Titanium dioxide (TiO2) oxygen sensors are made based on the characteristic that the resistance of the semiconductor material titanium dioxide changes with the oxygen content.(√)
2. The thermistor of the coolant temperature sensor usually has a positive temperature coefficient.(×)
3. The fuel injection amount of the electromagnetic injector depends on the width of the injection pulse signal provided by the ECU.(×)
7. The actuators controlling the air quantity can be divided into two types: one is the direct-acting throttle valve controlling the minimum opening of the throttle valve; the other controls the bypass air flow in the throttle bypass.(√)
8. Due to the characteristics of the three-way catalytic converter, the conversion efficiency near the air-fuel ratio is not high, so the air-fuel ratio must be controlled to be greater than 1.(× )
5. The resonant piezoelectric knock sensor produces the maximum resonant output when the vibration frequency of the oscillating piece does not match the vibration frequency of the engine being measured.(×)
6. If the ignition advance angle is too large, that is, if ignition occurs too early, it can easily cause knocking.(×)
7. The essence of idle control is to control the intake air volume at idle by adjusting the flow area of the air passage.(√)
8. In emission control, the catalytic and reduction capabilities of the three-way catalyst are strong, but when the air-fuel ratio is less than 1, its conversion efficiency is very low; only when the air-fuel ratio is greater than 1 can efficient reduction occur.(×)
9. In cruise control, the throttle is controlled by an actuator through another arm, replacing the driver’s pedal control of the throttle.
( ×)
9. The acceleration and deceleration during gear shifting in a continuously variable transmission operate in an unstable state, causing impacts in the power transmission system and increasing engine emissions.(×)
10. During braking, if the front wheels lock first, the car may skid; if the rear wheels lock first, the car may lose steering ability and drift.(×)
11. To ensure a comfortable ride, the damping of the shock absorber should be set low, while for high-speed racing, a high damping value can be chosen to enhance safety.(√ )
12. The stiffness of gas springs in the suspension system is adjustable, while the stiffness of ordinary mechanical springs is fixed.(×)
13. The power steering system in cars provides assistance only when parked or at low speeds, making steering easier.(√)
14. In a four-wheel steering system, when the speed is below 35 km/h, the rear wheels steer in the same direction as the front wheels.(×)
15. The airbag and seatbelt must be used together to provide good protection; using the airbag alone can easily cause injury.
(√)
16. In the automatic transmission system, the ECU controls not only the shifting timing and lock control but also the rear-seat control from N to D, where the transmission does not directly enter 1st gear but first advances to 2nd or 3rd gear before returning to 1st gear, thus reducing shift shock and alleviating rearward tilt.
()
2. From the component perspective, the electronically controlled gasoline injection system mainly consists of (B) three parts.
(A) intake system, throttle, ECU(B) fuel supply system, intake system, ECU
(C) intake system, gasoline injection system, throttle(D) carburetor, intake system, ECU
1. The generation mechanism of HC is mainly (A)
(A) incomplete combustion of fuel and wall quenching(B) incomplete combustion of hydrocarbons under local oxygen and low temperature
(C) reactions between oxygen and nitrogen under high-temperature conditions in the combustion chamber(D) uneven formation and distribution of the mixture
2. The generation mechanism of CO is mainly (B)
(A) incomplete combustion of fuel and wall quenching(B) incomplete combustion of hydrocarbons under local oxygen and low temperature
(C) reactions between oxygen and nitrogen under high-temperature conditions in the combustion chamber(D) uneven formation and distribution of the mixture
3. The generation mechanism of NOx is mainly (C)
(A) incomplete combustion of fuel and wall quenching(B) incomplete combustion of hydrocarbons under local oxygen and low temperature
(C) reactions between oxygen and nitrogen under high-temperature conditions in the combustion chamber(D) uneven formation and distribution of the mixture
4. Factors affecting the generation of harmful gases in emissions include (A)
(A) air-fuel ratio and ignition timing(B) idle timing
(C) automobile braking(D) exhaust gas recirculation
1. The zirconia oxygen sensor produces a sudden change when the excess air ratio coefficient α = 1, the output is ______ when α < 1, and the output is ______ when α > 1. (C)
(A) 1V, 2V(B) 0V, 1V(C) 1V, 0V(D) 0V, 5V
5. Automotive electronics control starts with engine control, and the electronic control of the engine begins with controlling (C)
which is also the most important control content of the engine.
(A) air-fuel ratio(B) idle timing(C) ignition timing(D) exhaust gas recirculation
6. The electronic control unit in cars is also known as: (B)
(A) CPU(B) ECU(C) ABS(D) ASR
7. The sensitivity K in the static characteristic parameters of the sensor can be expressed as (A).
Where, y is the output, x is the input, fs is the range, and M is the minimum detectable amount.
(A)(B)(C)(D)
3. The gasoline pressure regulator installed on the fuel supply pipe is used to adjust the system oil pressure, aiming to maintain a pressure difference of (C) kPa.
(A) 10(B) 50(C) 250(D) 500
1. The main function of the gasoline pressure regulator is to keep the pressure difference between the system oil pressure and the intake manifold pressure constant, generally at (B).
(A) 150kPa(B) 250kPa (C) 350kPa(D) 450kPa
6. The gasoline injection system can be divided into ( C ).
(A) mechanical, electromechanical, electronic(B) continuous injection, intermittent injection
(C) single-point gasoline injection, multi-point gasoline injection(D) synchronous, asynchronous injection
6. The fuel amount of the electromagnetic injector depends on the time the solenoid valve is open, which depends on the (A).
(A) injection pulse width (B) engine coolant temperature (C) air-fuel ratio(D) intake temperature
7. The factors controlled in the ignition system are (C).
(A) distributor, closing angle(B) advance angle, ignition head
(C) advance angle, closing angle, knock control(D) energizing time, knock control
7. The essence of closed-loop control of the air-fuel ratio is to maintain the actual air-fuel ratio at (B).
(A) 25:1 (B):1 (C) 10:1(D) 5:1
4. The resistance value of the deoxygenated titanium dioxide (TiO2) oxygen sensor quickly ______, and in the presence of oxygen, it regains oxygen, and the resistance ______, so when a rich mixture burns, its resistance value ______, and when a lean mixture burns, the resistance value ______. ( A )
(A) decreases, recovers, decreases, increases(B) increases, decreases, increases, decreases
(C) decreases, decreases, increases, increases(D) increases, increases, decreases, decreases
5. The stepper motor is an angular actuator, and when its step angle is °, after inputting 10 pulses, the angle that the motor shaft rotates is (A).
(A) 180°(B) 18° (C) 360°(D) 36°
8. The slip component of the wheel can be expressed as the slip rate S in the longitudinal motion of the wheel. When the wheel slips, (C)
(A) S = 0(B) S = 100%(C) 0 < S < 100%(D) S > 100%
9. The main function of the anti-lock braking system is to control the slip rate within (B)
(A) 0~10%(B) 10%~20%(C) 20%~30%(D) 30%~40%
9. The electronically controlled injection system of the diesel engine can be divided into displacement control and (B) control.
(A) direction(B) time(C) speed(D) quality
10. In the three-channel anti-lock braking system of the car, the front wheels are generally controlled ___, and the rear wheels are controlled ___.(A)
(A) independently, together(B) together, independently
(C) independently, independently(D) together, together
10. In the semi-active suspension system, the change in the damping force of the shock absorber is achieved by (B).
(A) changing the mechanical stiffness of the spring(B) changing the flow area of the control valve throttle
(C) changing the oil pressure in the hydraulic cylinder(D) changing the length of the control valve adjustment screw
11. The electronic control electric steering system uses (B).
(A) hydraulic devices(B) electric motors(C) pneumatic devices(D) solenoid valves
12. The continuously variable transmission widely used in light vehicles uses (C).
(A) hydraulic transmission(B) hydraulic mechanical transmission(C) V-belt transmission(D) belt transmission
9. The function of the drive slip control system is to implement braking measures by reducing engine torque to control the slip rate within ( B ) range.
(A) 5%~10%(B) 5%~15%(C) 10%~20%(D) 20%~30%