Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 42, Problem 1RQ
Although computers receive different information from a variety of sensors, the decisions for shifting are actually based on more than the inputs. What are they based on?
Expert Solution & Answer
To determine
The decisions shift or not to shift in the automatic transmission.
Answer to Problem 1RQ
The decisions to shift or not to shift in automatic transmission are based on the shift schedule and logic.
Explanation of Solution
Transmission control module (TCM) is designed or programmed in such a way that it receives signals from sensors, engine related or driver-controlled sensors to control the shift timing, torque converter clutch and shift feel. But the decisions to shift or not to shift is based on the shift schedule and logic. In shift schedule composed of shift points and are precisely selected based on the signals from appropriate sensors. Shift schedule logic select the appropriate gear. Other inputs TCM used to control shift speed are:
Throttle position.
Manifold absolute pressure.
Mass airflow.
Intake air temperature.
Barometric pressure.
Engine coolant temperature.
Crank shaft position.
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Students have asked these similar questions
4.75 An air-conditioning system is shown in Fig. P4.75 in which
air flows over tubes carrying Refrigerant 134a. Air enters
with a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and
exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar
with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat
transfer at the outer surface of the air conditioner, and
neglecting kinetic and potential energy effects, determine at
steady state
(a) the mass flow rate of the refrigerant, in kg/min.
(b) the rate of heat transfer, in kJ/min, between the air and
refrigerant.
3
R-134a
P3 = 5 bar
x3 = 0.20
Refrigerant 134
Air
P₁ = 1 bar
T₁ =32°C 305 K
(AV), 50 m³/min
=
Air
2-P2 = 0.95 bar
T2 22°C 295 K
=
=
4
R-134a
P4 = 5 bar
T4=20°C
4.42 Steam enters a well-insulated turbine operating at steady
state at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a
velocity of 10 m/s. The steam expands to the turbine exit where
the pressure is 0.07 MPa, specific enthalpy is 2431.7 kJ/kg,
and the velocity is 90 m/s. The mass flow rate is 11.95 kg/s.
Neglecting potential energy effects, determine the power
developed by the turbine, in kW.
The two blocks A and B have weights WA = 60 lb and
WB = 10 lb. If the kinetic coefficient of friction between the
incline and block A is μk = 0.2, determine the speed of A
after it moves 3 ft down the plane starting from rest. Neglect
the mass of the cord and pulleys.
3
B
Chapter 42 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 42 - Although computers receive different information...Ch. 42 - What happens if the TCM determines that the...Ch. 42 - How can air pressure be used to check an...Ch. 42 - True or False? On most late-model EAT systems,...Ch. 42 - Prob. 5RQCh. 42 - List five things that could cause incorrect shift...Ch. 42 - Most late-model transmission control systems have...Ch. 42 - What inputs are of prime importance to a computer...Ch. 42 - What are the advantages of using electronic...Ch. 42 - Voltage generation devices are typically used to...
Ch. 42 - Which of the following is not a voltage-generating...Ch. 42 - True or False? The neutral safety switch and...Ch. 42 - A glitch appears in the waveform of a vehicle...Ch. 42 - Prob. 14RQCh. 42 - Which of the following would probably not be...Ch. 42 - Technician A says that some systems use a special...Ch. 42 - Technician A says that shift solenoids direct...Ch. 42 - Technician A says that throttle position is an...Ch. 42 - Technician A says that a faulty TP sensor can...Ch. 42 - Technician A says that some shift solenoids can be...Ch. 42 - An electronically controlled transmission has...Ch. 42 - While discussing transmission adaptive learning:...Ch. 42 - While discussing valve body assemblies in...Ch. 42 - A hot-wire MAF has low resistance across it when...Ch. 42 - While diagnosing the cause of TCC shudder:...
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